FT232RQ-REEL - FTDI - Product.Network

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

Future Technology Devices

International Ltd.

FT232R USB UART IC

The FT232R is a USB to serial UART

interface with the following advanced

features:

Single chip USB to asynchronous serial data

transfer interface.

Entire USB protocol handled on the chip. No

USB specific firmware programming required.

Fully integrated 1024 bit EEPROM storing

device descriptors and CBUS I/O configuration.

Fully integrated USB termination resistors.

Fully integrated clock generation with no

external crystal required plus optional clock

output selection enabling a glue-less interface

to external MCU or FPGA.

Data transfer rates from 300 baud to 3 Mbaud

(RS422, RS485, RS232 ) at TTL levels.

128 byte receive buffer and 256 byte transmit

buffer utilising buffer smoothing technology to

allow for high data throughput.

FTDI‟s royalty-free Virtual Com Port (VCP) and

Direct (D2XX) drivers eliminate the

requirement for USB driver development in

most cases.

Unique USB FTDIChip-ID™ feature.

Configurable CBUS I/O pins.

Transmit and receive LED drive signals.

UART interface support for 7 or 8 data bits, 1

or 2 stop bits and odd / even / mark / space /

no parity

FIFO receive and transmit buffers for high data

throughput.

Synchronous and asynchronous bit bang

interface options with RD# and WR# strobes.

Device supplied pre-programmed with unique

USB serial number.

Supports bus powered, self powered and high-

power bus powered USB configurations.

Integrated +3.3V level converter for USB I/O.

Integrated level converter on UART and CBUS

for interfacing to between +1.8V and +5V

logic.

True 5V/3.3V/2.8V/1.8V CMOS drive output

and TTL input.

Configurable I/O pin output drive strength.

Integrated power-on-reset circuit.

Fully integrated AVCC supply filtering - no

external filtering required.

UART signal inversion option.

+3.3V (using external oscillator) to +5.25V

(internal oscillator) Single Supply Operation.

Low operating and USB suspend current.

Low USB bandwidth consumption.

UHCI/OHCI/EHCI host controller compatible.

USB 2.0 Full Speed compatible.

-40°C to 85°C extended operating temperature

range.

Available in compact Pb-free 28 Pin SSOP and

QFN-32 packages (both RoHS compliant).

Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted or reproduced

in any material or electronic form without the prior written consent of the copyright holder. This product and its documentation are

supplied on an as-is basis and no warranty as to their suitability for any particular purpose is either made or implied. Future Technology

Devices International Ltd will not accept any claim for damages howsoever arising as a result of use or failure of this product. Your

statutory rights are not affected. This product or any variant of it is not intended for use in any medical appliance, device or system in

which the failure of the product might reasonably be expected to result in personal injury. This document provides preliminary

information that may be subject to change without notice. No freedom to use patents or other intellectual property rights is implied by

the publication of this document. Future Technology Devices International Ltd, Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow

G41 1HH United Kingdom. Scotland Registered Company Number: SC136640

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

1 Typical Applications

USB to RS232/RS422/RS485 Converters

Upgrading Legacy Peripherals to USB

Cellular and Cordless Phone USB data transfer

cables and interfaces

Interfacing MCU/PLD/FPGA based designs to

USB

USB Audio and Low Bandwidth Video data

transfer

PDA to USB data transfer

USB Smart Card Readers

USB Instrumentation

USB Industrial Control

USB MP3 Player Interface

USB FLASH Card Reader and Writers

Set Top Box PC - USB interface

USB Digital Camera Interface

USB Hardware Modems

USB Wireless Modems

USB Bar Code Readers

USB Software and Hardware Encryption

Dongles

1.1 Driver Support

Royalty free VIRTUAL COM PORT

(VCP) DRIVERS for...

Windows 98, 98SE, ME, 2000, Server 2003, XP

and Server 2008

Windows 7 32,64-bit

Windows XP and XP 64-bit

Windows Vista and Vista 64-bit

Windows XP Embedded

Windows CE 4.2, 5.0 and 6.0

Mac OS 8/9, OS-X

Linux 2.4 and greater

Royalty free D2XX Direct Drivers

(USB Drivers + DLL S/W Interface)

Windows 98, 98SE, ME, 2000, Server 2003, XP

and Server 2008

Windows 7 32,64-bit

Windows XP and XP 64-bit

Windows Vista and Vista 64-bit

Windows XP Embedded

Windows CE 4.2, 5.0 and 6.0

Linux 2.4 and greater

The drivers listed above are all available to download for free from FTDI website (www.ftdichip.com).

Various 3rd party drivers are also available for other operating systems - see FTDI website

(www.ftdichip.com) for details.

For driver installation, please refer to http://www.ftdichip.com/Documents/InstallGuides.htm

1.2 Part Numbers

Part Number

Package

FT232RQ-xxxx

32 Pin QFN

FT232RL-xxxx

28 Pin SSOP

Note: Packing codes for xxxx is:

- Reel: Taped and Reel, (SSOP is 2,000pcs per reel, QFN is 6,000pcs per reel).

- Tube: Tube packing, 47pcs per tube (SSOP only)

- Tray: Tray packing, 490pcs per tray (QFN only)

For example: FT232RQ-Reel is 6,000pcs taped and reel packing

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

1.3 USB Compliant

The FT232R is fully compliant with the USB 2.0 specification and has been given the USB-IF Test-ID (TID)

40680004 (Rev B) and 40770018 (Rev C).

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

2 FT232R Block Diagram

Figure 2.1 FT232R Block Diagram

For a description of each function please refer to Section 4.

x4 Clock

Multiplier

UART

FIFO Controller

Serial Interface

Engine

( SIE )

USB

Protocol Engine

Baud Rate

Generator

UART Controller

with

Programmable

Signal Inversion

3.3 Volt

LDO

Regulator

USB

Transceiver

with

Integrated

Series

Resistors

and 1.5K

Pull-

USB DPLL

Internal

12MHz

Oscillator 48MHz

48MHz

OCSI

(optional)

OSCO

(optional)

USBDP

USBDM

3V3OUT

VCC

DBUS0

DBUS1

DBUS2

DBUS3

DBUS4

DBUS5

DBUS6

DBUS7

CBUS0

CBUS2

CBUS3

SLEEP#

RESET#

TEST

GND

Reset

Generator

3V3OUT

CBUS1

FIFO RX

Buffer

FIFO TX Buffer

Internal

EEPROM

To USB Transeiver Cell

CBUS4

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

Table of Contents

1 Typical Applications ........................................................................ 2

1.1 Driver Support .................................................................................... 2

1.2 Part Numbers...................................................................................... 2

Note: Packing codes for xxxx is: .................................................................. 2

1.3 USB Compliant .................................................................................... 3

2 FT232R Block Diagram .................................................................... 4

3 Device Pin Out and Signal Description ............................................ 7

3.1 28-LD SSOP Package .......................................................................... 7

3.2 SSOP Package Pin Out Description ...................................................... 7

3.3 QFN-32 Package ............................................................................... 10

3.4 QFN-32 Package Signal Description .................................................. 10

3.5 CBUS Signal Options ......................................................................... 13

4 Function Description ..................................................................... 14

4.1 Key Features ..................................................................................... 14

4.2 Functional Block Descriptions ........................................................... 15

5 Devices Characteristics and Ratings .............................................. 17

5.1 Absolute Maximum Ratings............................................................... 17

5.2 DC Characteristics............................................................................. 18

5.3 EEPROM Reliability Characteristics ................................................... 21

5.4 Internal Clock Characteristics ........................................................... 21

6 USB Power Configurations ............................................................ 23

6.1 USB Bus Powered Configuration ...................................................... 23

6.2 Self Powered Configuration .............................................................. 24

6.3 USB Bus Powered with Power Switching Configuration .................... 25

6.4 USB Bus Powered with Selectable External Logic Supply .................. 26

7 Application Examples .................................................................... 27

7.1 USB to RS232 Converter ................................................................... 27

7.2 USB to RS485 Coverter ..................................................................... 28

7.3 USB to RS422 Converter ................................................................... 29

7.4 USB to MCU UART Interface .............................................................. 30

7.5 LED Interface .................................................................................... 31

7.6 Using the External Oscillator ............................................................ 32

8 Internal EEPROM Configuration .................................................... 33

9 Package Parameters ..................................................................... 35

9.1 SSOP-28 Package Dimensions .......................................................... 35

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

9.2 QFN-32 Package Dimensions ............................................................ 36

9.3 QFN-32 Package Typical Pad Layout ................................................. 37

9.4 QFN-32 Package Typical Solder Paste Diagram ................................. 37

9.5 Solder Reflow Profile ........................................................................ 38

10 Contact Information ................................................................... 39

Appendix A – References ........................................................................... 40

Appendix B - List of Figures and Tables ..................................................... 41

Appendix C - Revision History .................................................................... 43

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

3 Device Pin Out and Signal Description

3.1 28-LD SSOP Package

Figure 3.1 SSOP Package Pin Out and Schematic Symbol

3.2 SSOP Package Pin Out Description

Note: The convention used throughout this document for active low signals is the signal name followed by

a #

Pin No.

Name

Type

Description

USBDP

I/O

USB Data Signal Plus, incorporating internal series resistor and 1.5kΩ pull up

resistor to 3.3V.

USBDM

I/O

USB Data Signal Minus, incorporating internal series resistor.

Table 3.1 USB Interface Group

Pin No.

Name

Type

Description

VCCIO

PWR

+1.8V to +5.25V supply to the UART Interface and CBUS group pins (1...3, 5, 6,

9...14, 22, 23). In USB bus powered designs connect this pin to 3V3OUT pin to

drive out at +3.3V levels, or connect to VCC to drive out at 5V CMOS level. This

pin can also be supplied with an external +1.8V to +2.8V supply in order to drive

outputs at lower levels. It should be noted that in this case this supply should

originate from the same source as the supply to VCC. This means that in bus

powered designs a regulator which is supplied by the +5V on the USB bus should

be used.

7, 18,

GND

PWR

Device ground supply pins

USBDP

USBDM

3V3OUT

GND

RESET#

VCC

GND

AGND

TEST

OSCI

OSCO

CBUS1

CBUS0

TXD

RTS#

RXD

DTR#

VCCIO

RI#

GND

DSR#

DCD#

CTS#

CBUS4

CBUS2

CBUS3

14 15

FT232RL

25 718 21 26

3V3OUT

VCCIO

RESET#

TXD

RXD

RTS#

CTS#

DTR#

DSR#

DCD#

RI#

CBUS0

CBUS3

CBUS2

CBUS1

15 USBDP

USBDM

VCC

OSCI

OSCO

CBUS4 12

FTDI

FT232RL

YYXX-A

XXXXXXXXXXXX

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

Pin No.

Name

Type

Description

3V3OUT

Output

+3.3V output from integrated LDO regulator. This pin should be decoupled to

ground using a 100nF capacitor. The main use of this pin is to provide the internal

+3.3V supply to the USB transceiver cell and the internal 1.5kΩ pull up resistor on

USBDP. Up to 50mA can be drawn from this pin to power external logic if

required. This pin can also be used to supply the VCCIO pin.

VCC

PWR

+3.3V to +5.25V supply to the device core. (see Note 1)

AGND

PWR

Device analogue ground supply for internal clock multiplier

Table 3.2 Power and Ground Group

Pin No.

Name

Type

Description

8, 24

No internal connection

RESET#

Input

Active low reset pin. This can be used by an external device to reset the

FT232R. If not required can be left unconnected, or pulled up to VCC.

TEST

Input

Puts the device into IC test mode. Must be tied to GND for normal

operation, otherwise the device will appear to fail.

OSCI

Input

Input 12MHz Oscillator Cell. Optional – Can be left unconnected for

normal operation. (see Note 2)

OSCO

Output

Output from 12MHZ Oscillator Cell. Optional – Can be left unconnected

for normal operation if internal Oscillator is used. (see Note 2)

Table 3.3 Miscellaneous Signal Group

Pin No.

Name

Type

Description

TXD

Output

Transmit Asynchronous Data Output.

DTR#

Output

Data Terminal Ready Control Output / Handshake Signal.

RTS#

Output

Request to Send Control Output / Handshake Signal.

RXD

Input

Receiving Asynchronous Data Input.

RI#

Input

Ring Indicator Control Input. When remote wake up is enabled in the

internal EEPROM taking RI# low (20ms active low pulse) can be used to

resume the PC USB host controller from suspend.

DSR#

Input

Data Set Ready Control Input / Handshake Signal.

DCD#

Input

Data Carrier Detect Control Input.

CTS#

Input

Clear To Send Control Input / Handshake Signal.

CBUS4

I/O

Configurable CBUS output only Pin. Function of this pin is configured in

the device internal EEPROM. Factory default configuration is SLEEP#. See

CBUS Signal Options, Table 3.9.

CBUS2

I/O

Configurable CBUS I/O Pin. Function of this pin is configured in the

device internal EEPROM. Factory default configuration is TXDEN. See

CBUS Signal Options, Table 3.9.

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

Pin No.

Name

Type

Description

CBUS3

I/O

Configurable CBUS I/O Pin. Function of this pin is configured in the

device internal EEPROM. Factory default configuration is PWREN#. See

CBUS Signal Options, Table 3.9. PWREN# should be used with a 10kΩ

resistor pull up.

CBUS1

I/O

Configurable CBUS I/O Pin. Function of this pin is configured in the

device internal EEPROM. Factory default configuration is RXLED#. See

CBUS Signal Options, Table 3.9.

CBUS0

I/O

Configurable CBUS I/O Pin. Function of this pin is configured in the

device internal EEPROM. Factory default configuration is TXLED#. See

CBUS Signal Options, Table 3.9.

Table 3.4 UART Interface and CUSB Group (see note 3)

Notes:

1. The minimum operating voltage VCC must be +4.0V (could use VBUS=+5V) when using the

internal clock generator. Operation at +3.3V is possible using an external crystal oscillator.

2. For details on how to use an external crystal, ceramic resonator, or oscillator with the FT232R,

please refer Section 7.6

3. When used in Input Mode, the input pins are pulled to VCCIO via internal 200kΩ resistors. These

pins can be programmed to gently pull low during USB suspend (PWREN# = “1”) by setting an

option in the internal EEPROM.

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

3.3 QFN-32 Package

Figure 3.2 QFN-32 Package Pin Out and schematic symbol

3.4 QFN-32 Package Signal Description

Pin No.

Name

Type

Description

USBDP

I/O

USB Data Signal Plus, incorporating internal series resistor and 1.5kΩ pull up resistor

to +3.3V.

USBDM

I/O

USB Data Signal Minus, incorporating internal series resistor.

Table 3.5 USB Interface Group

Pin No.

Name

Type

Description

VCCIO

PWR

+1.8V to +5.25V supply for the UART Interface and CBUS group pins (2, 3,

6,7,8,9,10 11, 21, 22, 30,31,32). In USB bus powered designs connect this pin to

3V3OUT to drive out at +3.3V levels, or connect to VCC to drive out at +5V CMOS

level. This pin can also be supplied with an external +1.8V to +2.8V supply in order

to drive out at lower levels. It should be noted that in this case this supply should

originate from the same source as the supply to VCC. This means that in bus

powered designs a regulator which is supplied by the +5V on the USB bus should be

used.

4, 17, 20

GND

PWR

Device ground supply pins.

FT232RQ

32 25

169

YYXX-A

10111213141516

25 26 27 28 29 30 31 32

USBDP

USBDM

3V3OUT

RESET#

VCC

AGND

TEST

OSCI

OSCO

CBUS1

CBUS0

TXD

RTS#

RXD

DTR#

VCCIO

RI#

GND

DSR#

DCD#

CTS#

CBUS4

CBUS2

CBUS3

GND

FT232RQ

24 417 20 26

3V3OUT

VCCIO

RESET#

TXD

RXD

RTS#

CTS#

DTR#

DSR#

DCD#

RI#

CBUS0

CBUS3

CBUS2

CBUS1

14 USBDP

USBDM

VCC

OSCI

OSCO

CBUS4 9

12 NC

29 NC

FTD

XXXXXXX

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

Pin No.

Name

Type

Description

3V3OUT

Output

+3.3V output from integrated LDO regulator. This pin should be decoupled to

ground using a 100nF capacitor. The purpose of this output is to provide the

internal +3.3V supply to the USB transceiver cell and the internal 1.5kΩ pull up

resistor on USBDP. Up to 50mA can be drawn from this pin to power external logic if

required. This pin can also be used to supply the VCCIO pin.

VCC

PWR

+3.3V to +5.25V supply to the device core. (See Note 1).

AGND

PWR

Device analogue ground supply for internal clock multiplier.

Table 3.6 Power and Ground Group

Pin No.

Name

Type

Description

5, 12,

13, 23,

25, 29

No internal connection. Do not connect.

RESET#

Input

Active low reset. Can be used by an external device to reset the FT232R. If not

required can be left unconnected, or pulled up to VCC.

TEST

Input

Puts the device into IC test mode. Must be tied to GND for normal operation,

otherwise the device will appear to fail.

OSCI

Input

Input 12MHz Oscillator Cell. Optional – Can be left unconnected for normal

operation. (See Note 2).

OSCO

Output

Output from 12MHZ Oscillator Cell. Optional – Can be left unconnected for normal

operation if internal Oscillator is used. (See Note 2).

Table 3.7 Miscellaneous Signal Group

No.

Name

Type

Description

TXD

Output

Transmit Asynchronous Data Output.

DTR#

Output

Data Terminal Ready Control Output / Handshake Signal.

RTS#

Output

Request to Send Control Output / Handshake Signal.

RXD

Input

Receiving Asynchronous Data Input.

RI#

Input

Ring Indicator Control Input. When remote wake up is enabled in the internal EEPROM

taking RI# low (20ms active low pulse) can be used to resume the PC USB host

controller from suspend.

DSR#

Input

Data Set Ready Control Input / Handshake Signal.

DCD#

Input

Data Carrier Detect Control Input.

CTS#

Input

Clear To Send Control Input / Handshake Signal.

CBUS4

I/O

Configurable CBUS output only Pin. Function of this pin is configured in the device

internal EEPROM. Factory default configuration is SLEEP#. See CBUS Signal Options,

Table 3.9.

CBUS2

I/O

Configurable CBUS I/O Pin. Function of this pin is configured in the device internal

EEPROM. Factory default configuration is TXDEN. See CBUS Signal Options, Table 3.9.

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

No.

Name

Type

Description

CBUS3

I/O

Configurable CBUS I/O Pin. Function of this pin is configured in the device internal

EEPROM. Factory default configuration is PWREN#. See CBUS Signal Options, Table

3.9. PWREN# should be used with a 10kΩ resistor pull up.

CBUS1

I/O

Configurable CBUS I/O Pin. Function of this pin is configured in the device internal

EEPROM. Factory default configuration is RXLED#. See CBUS Signal Options, Table 3.9.

CBUS0

I/O

Configurable CBUS I/O Pin. Function of this pin is configured in the device internal

EEPROM. Factory default configuration is TXLED#. See CBUS Signal Options, Table 3.9.

Table 3.8 UART Interface and CBUS Group (see note 3)

Notes:

1. The minimum operating voltage VCC must be +4.0V (could use VBUS=+5V) when using the

internal clock generator. Operation at +3.3V is possible using an external crystal oscillator.

2. For details on how to use an external crystal, ceramic resonator, or oscillator with the FT232R,

please refer to Section 7.6.

3. When used in Input Mode, the input pins are pulled to VCCIO via internal 200kΩ resistors. These

pins can be programmed to gently pull low during USB suspend (PWREN# = “1”) by setting an

option in the internal EEPROM.

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

3.5 CBUS Signal Options

The following options can be configured on the CBUS I/O pins. CBUS signal options are common to both

package versions of the FT232R. These options can be configured in the internal EEPROM using the

software utility FT_PPROG or MPROG, which can be downloaded from the FTDI Utilities

(www.ftdichip.com). The default configuration is described in Section 8.

CBUS

Signal

Option

Available On CBUS Pin

Description

TXDEN

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

Enable transmit data for RS485

PWREN#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

Output is low after the device has been configured by

USB, then high during USB suspend mode. This output can

be used to control power to external logic P-Channel logic

level MOSFET switch. Enable the interface pull-down

option when using the PWREN# in this way.*

TXLED#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

Transmit data LED drive: Data from USB Host to

FT232R. Pulses low when transmitting data via USB. See

Section 7.5 for more details.

RXLED#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

Receive data LED drive: Data from FT232R to USB Host.

Pulses low when receiving data via USB. See Section 7.5

for more details.

TX&RXLED#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

LED drive – pulses low when transmitting or receiving data

via USB. See Section 7.5 for more details.

SLEEP#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

Goes low during USB suspend mode. Typically used to

power down an external TTL to RS232 level converter IC

in USB to RS232 converter designs.

CLK48

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

48MHz ±0.7% Clock output. **

CLK24

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

24 MHz Clock output.**

CLK12

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

12 MHz Clock output.**

CLK6

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

6 MHz ±0.7% Clock output. **

CBitBangI/O

CBUS0, CBUS1, CBUS2, CBUS3

CBUS bit bang mode option. Allows up to 4 of the CBUS

pins to be used as general purpose I/O. Configured

individually for CBUS0, CBUS1, CBUS2 and CBUS3 in the

internal EEPROM. A separate application note, AN232R-01,

available from FTDI website (www.ftdichip.com) describes

in more detail how to use CBUS bit bang mode.

BitBangWRn

CBUS0, CBUS1, CBUS2, CBUS3

Synchronous and asynchronous bit bang mode WR#

strobe output.

BitBangRDn

CBUS0, CBUS1, CBUS2, CBUS3

Synchronous and asynchronous bit bang mode RD# strobe

output.

Table 3.9 CBUS Configuration Control

* PWREN# must be used with a 10kΩ resistor pull up.

**When in USB suspend mode the outputs clocks are also suspended.

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

4 Function Description

The FT232R is a USB to serial UART interface device which simplifies USB to serial designs and reduces

external component count by fully integrating an external EEPROM, USB termination resistors and an

integrated clock circuit which requires no external crystal, into the device. It has been designed to

operate efficiently with a USB host controller by using as little as possible of the total USB bandwidth

available.

4.1 Key Features

Functional Integration. Fully integrated EEPROM, USB termination resistors, clock generation, AVCC

filtering, POR and LDO regulator.

Configurable CBUS I/O Pin Options. The fully integrated EEPROM allows configuration of the Control

Bus (CBUS) functionality, signal inversion and drive strength selection. There are 5 configurable CBUS

I/O pins. These configurable options are

1. TXDEN - transmit enable for RS485 designs.

2. PWREN# - Power control for high power, bus powered designs.

3. TXLED# - for pulsing an LED upon transmission of data.

4. RXLED# - for pulsing an LED upon receiving data.

5. TX&RXLED# - which will pulse an LED upon transmission OR reception of data.

6. SLEEP# - indicates that the device going into USB suspend mode.

7. CLK48 / CLK24 / CLK12 / CLK6 - 48MHz, 24MHz, 12MHz, and 6MHz clock output signal

options.

The CBUS pins can also be individually configured as GPIO pins, similar to asynchronous bit bang mode.

It is possible to use this mode while the UART interface is being used, thus providing up to 4 general

purpose I/O pins which are available during normal operation. An application note, AN232R-01, available

from FTDI website (www.ftdichip.com) describes this feature.

The CBUS lines can be configured with any one of these output options by setting bits in the internal

EEPROM. The device is supplied with the most commonly used pin definitions pre-programmed - see

Section 8 for details.

Asynchronous Bit Bang Mode with RD# and WR# Strobes. The FT232R supports FTDI‟s previous

chip generation bit-bang mode. In bit-bang mode, the eight UART lines can be switched from the regular

interface mode to an 8-bit general purpose I/O port. Data packets can be sent to the device and they will

be sequentially sent to the interface at a rate controlled by an internal timer (equivalent to the baud rate

pre-scaler). With the FT232R device this mode has been enhanced by outputting the internal RD# and

WR# strobes signals which can be used to allow external logic to be clocked by accesses to the bit-bang

I/O bus. This option will be described more fully in a separate application note available from FTDI

website (www.ftdichip.com).

Synchronous Bit Bang Mode. The FT232R supports synchronous bit bang mode. This mode differs from

asynchronous bit bang mode in that the interface pins are only read when the device is written to. This

makes it easier for the controlling program to measure the response to an output stimulus as the data

returned is synchronous to the output data. An application note, AN232R-01, available from FTDI website

(www.ftdichip.com) describes this feature.

FTDIChip-ID™. The FT232R also includes the new FTDIChip-ID™ security dongle feature. This

FTDIChip-ID™ feature allows a unique number to be burnt into each device during manufacture. This

number cannot be reprogrammed. This number is only readable over USB and forms a basis of a security

dongle which can be used to protect any customer application software being copied. This allows the

possibility of using the FT232R in a dongle for software licensing. Further to this, a renewable license

scheme can be implemented based on the FTDIChip-ID™ number when encrypted with other information.

This encrypted number can be stored in the user area of the FT232R internal EEPROM, and can be

decrypted, then compared with the protected FTDIChip-ID™ to verify that a license is valid. Web based

applications can be used to maintain product licensing this way. An application note, AN232R-02,

available from FTDI website (www.ftdichip.com) describes this feature.

The FT232R is capable of operating at a voltage supply between +3.3V and +5V with a nominal

operational mode current of 15mA and a nominal USB suspend mode current of 70µA. This allows greater

margin for peripheral designs to meet the USB suspend mode current limit of 2.5mA. An integrated level

converter within the UART interface allows the FT232R to interface to UART logic running at +1.8V, 2.5V,

+3.3V or +5V.

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Clearance No.: FTDI# 38

4.2 Functional Block Descriptions

The following paragraphs detail each function within the FT232R. Please refer to the block diagram shown

in Figure 2.1

Internal EEPROM. The internal EEPROM in the FT232R is used to store USB Vendor ID (VID), Product ID

(PID), device serial number, product description string and various other USB configuration descriptors.

The internal EEPROM is also used to configure the CBUS pin functions. The FT232R is supplied with the

internal EEPROM pre-programmed as described in Section 8. A user area of the internal EEPROM is

available to system designers to allow storing additional data. The internal EEPROM descriptors can be

programmed in circuit, over USB without any additional voltage requirement. It can be programmed

using the FTDI utility software called MPROG, which can be downloaded from FTDI Utilities on the FTDI

website (www.ftdichip.com).

+3.3V LDO Regulator. The +3.3V LDO regulator generates the +3.3V reference voltage for driving the

USB transceiver cell output buffers. It requires an external decoupling capacitor to be attached to the

3V3OUT regulator output pin. It also provides +3.3V power to the 1.5kΩ internal pull up resistor on

USBDP. The main function of the LDO is to power the USB Transceiver and the Reset Generator Cells

rather than to power external logic. However, it can be used to supply external circuitry requiring a

+3.3V nominal supply with a maximum current of 50mA.

USB Transceiver. The USB Transceiver Cell provides the USB 1.1 / USB 2.0 full-speed physical interface

to the USB cable. The output drivers provide +3.3V level slew rate control signalling, whilst a differential

input receiver and two single ended input receivers provide USB data in, Single-Ended-0 (SE0) and USB

reset detection conditions respectfully. This function also incorporates the internal USB series termination

resistors on the USB data lines and a 1.5kΩ pull up resistor on USBDP.

USB DPLL. The USB DPLL cell locks on to the incoming NRZI USB data and generates recovered clock

and data signals for the Serial Interface Engine (SIE) block.

Internal 12MHz Oscillator - The Internal 12MHz Oscillator cell generates a 12MHz reference clock. This

provides an input to the x4 Clock Multiplier function. The 12MHz Oscillator is also used as the reference

clock for the SIE, USB Protocol Engine and UART FIFO controller blocks.

Clock Multiplier / Divider. The Clock Multiplier / Divider takes the 12MHz input from the Internal

Oscillator function and generates the 48MHz, 24MHz, 12MHz and 6MHz reference clock signals. The 48Mz

clock reference is used by the USB DPLL and the Baud Rate Generator blocks.

Serial Interface Engine (SIE). The Serial Interface Engine (SIE) block performs the parallel to serial

and serial to parallel conversion of the USB data. In accordance with the USB 2.0 specification, it

performs bit stuffing/un-stuffing and CRC5/CRC16 generation. It also checks the CRC on the USB data

stream.

USB Protocol Engine. The USB Protocol Engine manages the data stream from the device USB control

endpoint. It handles the low level USB protocol requests generated by the USB host controller and the

commands for controlling the functional parameters of the UART in accordance with the USB 2.0

specification chapter 9.

FIFO RX Buffer (128 bytes). Data sent from the USB host controller to the UART via the USB data OUT

endpoint is stored in the FIFO RX (receive) buffer. Data is removed from the buffer to the UART transmit

FIFO TX Buffer (256 bytes). Data from the UART receive register is stored in the TX buffer. The USB

host controller removes data from the FIFO TX Buffer by sending a USB request for data from the device

data IN endpoint. (Tx relative to the USB interface).

UART FIFO Controller. The UART FIFO controller handles the transfer of data between the FIFO RX and

TX buffers and the UART transmit and receive registers.

UART Controller with Programmable Signal Inversion and High Drive. Together with the UART

FIFO Controller the UART Controller handles the transfer of data between the FIFO RX and FIFO TX

buffers and the UART transmit and receive registers. It performs asynchronous 7 or 8 bit parallel to serial

and serial to parallel conversion of the data on the RS232 (or RS422 or RS485) interface.

Control signals supported by UART mode include RTS, CTS, DSR, DTR, DCD and RI. The UART Controller

also provides a transmitter enable control signal pin option (TXDEN) to assist with interfacing to RS485

transceivers. RTS/CTS, DSR/DTR and XON / XOFF handshaking options are also supported. Handshaking

is handled in hardware to ensure fast response times. The UART interface also supports the RS232

BREAK setting and detection conditions.

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Additionally, the UART signals can each be individually inverted and have a configurable high drive

strength capability. Both these features are configurable in the EEPROM.

Baud Rate Generator - The Baud Rate Generator provides a 16x clock input to the UART Controller

from the 48MHz reference clock. It consists of a 14 bit pre-scaler and 3 register bits which provide fine

tuning of the baud rate (used to divide by a number plus a fraction or “sub-integer”). This determines the

baud rate of the UART, which is programmable from 183 baud to 3 Mbaud.

The FT232R supports all standard baud rates and non-standard baud rates from 183 Baud up to 3

Mbaud. Achievable non-standard baud rates are calculated as follows -

Baud Rate = 3000000 / (n + x)

where „n‟ can be any integer between 2 and 16,384 ( = 214 ) and „x’ can be a sub-integer of the value 0,

0.125, 0.25, 0.375, 0.5, 0.625, 0.75, or 0.875. When n = 1, x = 0, i.e. baud rate divisors with values

between 1 and 2 are not possible.

This gives achievable baud rates in the range 183.1 baud to 3,000,000 baud. When a non-standard baud

rate is required simply pass the required baud rate value to the driver as normal, and the FTDI driver will

calculate the required divisor, and set the baud rate. See FTDI application note AN232B-05 on the FTDI

website (www.ftdichip.com) for more details.

RESET Generator - The integrated Reset Generator Cell provides a reliable power-on reset to the device

internal circuitry at power up. The RESET# input pin allows an external device to reset the FT232R.

RESET# can be tied to VCC or left unconnected if not being used.

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5 Devices Characteristics and Ratings

5.1 Absolute Maximum Ratings

The absolute maximum ratings for the FT232R devices are as follows. These are in accordance with the

Absolute Maximum Rating System (IEC 60134). Exceeding these may cause permanent damage to the

device.

Parameter

Value

Unit

Storage Temperature

-65°C to 150°C

Degrees C

Floor Life (Out of Bag) At Factory Ambient

(30°C / 60% Relative Humidity)

168 Hours

(IPC/JEDEC J-STD-033A MSL Level 3

Compliant)*

Hours

Ambient Temperature (Power Applied)

-40°C to 85°C

Degrees C

MTTF FT232RL

11162037

hours

MTTF FT232RQ

4464815

hours

VCC Supply Voltage

-0.5 to +6.00

DC Input Voltage – USBDP and USBDM

-0.5 to +3.8

DC Input Voltage – High Impedance

Bidirectionals

-0.5 to + (VCC +0.5)

DC Input Voltage – All Other Inputs

-0.5 to + (VCC +0.5)

DC Output Current – Outputs

DC Output Current – Low Impedance

Bidirectionals

Power Dissipation (VCC = 5.25V)

500

Table 5.1 Absolute Maximum Ratings

* If devices are stored out of the packaging beyond this time limit the devices should be baked before

use. The devices should be ramped up to a temperature of +125°C and baked for up to 17 hours.

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5.2 DC Characteristics

DC Characteristics (Ambient Temperature = -40°C to +85°C)

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

VCC1

VCC Operating Supply

Voltage

4.0

---

5.25

Using Internal

Oscillator

VCC1

VCC Operating Supply

Voltage

3.3

---

5.25

Using External

Crystal

VCC2

VCCIO Operating

Supply Voltage

1.8

---

5.25

Icc1

Operating Supply

Current

---

Normal Operation

Icc2

Operating Supply

Current

100

μA

USB Suspend

3V3

3.3v regulator output

3.0

3.3

3.6

Table 5.2 Operating Voltage and Current

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

Voh

Output Voltage High

3.2

4.1

4.9

I source = 2mA

Vol

Output Voltage Low

0.3

0.4

0.6

I sink = 2mA

Vin

Input Switching

Threshold

1.0

1.2

1.5

VHys

Input Switching

Hysteresis

Table 5.3 UART and CBUS I/O Pin Characteristics (VCCIO = +5.0V, Standard Drive Level)

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

Voh

Output Voltage High

2.2

2.7

3.2

I source = 1mA

Vol

Output Voltage Low

0.3

0.4

0.5

I sink = 2mA

Vin

Input Switching

Threshold

1.0

1.2

1.5

VHys

Input Switching

Hysteresis

Table 5.4 UART and CBUS I/O Pin Characteristics (VCCIO = +3.3V, Standard Drive Level)

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Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

Voh

Output Voltage High

2.1

2.6

2.8

I source = 1mA

Vol

Output Voltage Low

0.3

0.4

0.5

I sink = 2mA

Vin

Input Switching

Threshold

1.0

1.2

1.5

VHys

Input Switching

Hysteresis

Table 5.5 UART and CBUS I/O Pin Characteristics (VCCIO = +2.8V, Standard Drive Level)

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

Voh

Output Voltage High

1.32

1.62

1.8

I source = 0.2mA

Vol

Output Voltage Low

0.06

0.1

0.18

I sink = 0.5mA

Vin

Input Switching

Threshold

1.0

1.2

1.5

VHys

Input Switching

Hysteresis

Table 5.6 UART and CBUS I/O Pin Characteristics (VCCIO = +1.8V, Standard Drive Level)

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

Voh

Output Voltage High

3.2

4.1

4.9

I source = 6mA

Vol

Output Voltage Low

0.3

0.4

0.6

I sink = 6mA

Vin

Input Switching

Threshold

1.0

1.2

1.5

VHys

Input Switching

Hysteresis

Table 5.7 UART and CBUS I/O Pin Characteristics (VCCIO = +5.0V, High Drive Level)

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

Voh

Output Voltage High

2.2

2.8

3.2

I source = 3mA

Vol

Output Voltage Low

0.3

0.4

0.6

I sink = 8mA

Vin

Input Switching

Threshold

1.0

1.2

1.5

VHys

Input Switching

Hysteresis

Table 5.8 UART and CBUS I/O Pin Characteristics (VCCIO = +3.3V, High Drive Level)

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Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

Voh

Output Voltage High

2.1

2.6

2.8

I source = 3mA

Vol

Output Voltage Low

0.3

0.4

0.6

I sink = 8mA

Vin

Input Switching

Threshold

1.0

1.2

1.5

VHys

Input Switching

Hysteresis

Table 5.9 UART and CBUS I/O Pin Characteristics (VCCIO = +2.8V, High Drive Level)

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

Voh

Output Voltage High

1.35

1.67

1.8

I source = 0.4mA

Vol

Output Voltage Low

0.12

0.18

0.35

I sink = 3mA

Vin

Input Switching

Threshold

1.0

1.2

1.5

VHys

Input Switching

Hysteresis

Table 5.10 UART and CBUS I/O Pin Characteristics (VCCIO = +1.8V, High Drive Level)

** Only input pins have an internal 200KΩ pull-up resistor to VCCIO

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

Vin

Input Switching

Threshold

1.3

1.6

1.9

VHys

Input Switching

Hysteresis

Table 5.11 RESET# and TEST Pin Characteristics

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Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

UVoh

I/O Pins Static Output

(High)

2.8

3.6

RI = 1.5kΩ to

3V3OUT (D+) RI =

15KΩ to GND (D-)

UVol

I/O Pins Static Output

(Low)

0.3

RI = 1.5kΩ to

3V3OUT (D+) RI =

15kΩ to GND (D-)

UVse

Single Ended Rx

Threshold

0.8

2.0

UCom

Differential Common

Mode

0.8

2.5

UVDif

Differential Input

Sensitivity

0.2

UDrvZ

Driver Output

Impedance

Ohms

See Note 1

Table 5.12 USB I/O Pin (USBDP, USBDM) Characteristics

5.3 EEPROM Reliability Characteristics

The internal 1024 Bit EEPROM has the following reliability characteristics:

Parameter

Value

Unit

Data Retention

Years

Read / Write Cycle

10,000

Cycles

Table 5.13 EEPROM Characteristics

5.4 Internal Clock Characteristics

The internal Clock Oscillator has the following characteristics:

Parameter

Value

Unit

Minimum

Typical

Maximum

Frequency of Operation

(see Note 1)

11.98

12.00

12.02

MHz

Clock Period

83.19

83.33

83.47

Duty Cycle

Table 5.14 Internal Clock Characteristics

Note 1: Equivalent to +/-1667ppm

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Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

Voh

Output Voltage High

2.1

2.8

3.2

I source =

3mA

Vol

Output Voltage Low

0.3

0.4

0.6

I sink = 8mA

Vin

Input Switching Threshold

1.0

1.2

1.5

Table 5.15 OSCI, OSCO Pin Characteristics – see Note 1

Note1: When supplied, the FT232R is configured to use its internal clock oscillator. These characteristics

only apply when an external oscillator or crystal is used.

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Clearance No.: FTDI# 38

6 USB Power Configurations

The following sections illustrate possible USB power configurations for the FT232R. The illustrations have

omitted pin numbers for ease of understanding since the pins differ between the FT232RL and FT232RQ

package options.

All USB power configurations illustrated apply to both package options for the FT232R device. Please refer

to Section 3 for the package option pin-out and signal descriptions.

6.1 USB Bus Powered Configuration

Figure 6.1 Bus Powered Configuration

Figure 6.1 Illustrates the FT232R in a typical USB bus powered design configuration. A USB bus powered

device gets its power from the USB bus. Basic rules for USB bus power devices are as follows –

i) On plug-in to USB, the device should draw no more current than 100mA.

ii) In USB Suspend mode the device should draw no more than 2.5mA.

iii) A bus powered high power USB device (one that draws more than 100mA) should use one of

the CBUS pins configured as PWREN# and use it to keep the current below 100mA on plug-in

and 2.5mA on USB suspend.

iv) A device that consumes more than 100mA cannot be plugged into a USB bus powered hub.

v) No device can draw more than 500mA from the USB bus.

The power descriptors in the internal EEPROM of the FT232R should be programmed to match the current

drawn by the device.

A ferrite bead is connected in series with the USB power supply to reduce EMI noise from the FT232R and

associated circuitry being radiated down the USB cable to the USB host. The value of the Ferrite Bead

depends on the total current drawn by the application. A suitable range of Ferrite Beads is available from

Steward (www.steward.com), for example Steward Part # MI0805K400R-10.

Note: If using PWREN# (available using the CBUS) the pin should be pulled to VCCIO using a 10kΩ

resistor.

FT232R

100nF

3V3OUT

VCCIO

RESET#

100nF

10nF

Vcc

TXD

RXD

RTS#

CTS#

DTR#

DSR#

DCD#

RI#

CBUS0

CBUS3

CBUS2

CBUS1

USBDP

USBDM

VCC

OSCI

OSCO

CBUS4

Ferrite

Bead

4.7uF

SHIELD

GND

Vcc

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FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

6.2 Self Powered Configuration

Figure 6.2 Self Powered Configuration

Figure 6.2 illustrates the FT232R in a typical USB self powered configuration. A USB self powered device

gets its power from its own power supply, VCC, and does not draw current from the USB bus. The basic

rules for USB self powered devices are as follows –

i) A self powered device should not force current down the USB bus when the USB host or hub

controller is powered down.

ii) A self powered device can use as much current as it needs during normal operation and USB

suspend as it has its own power supply.

iii) A self powered device can be used with any USB host, a bus powered USB hub or a self

powered USB hub.

The power descriptor in the internal EEPROM of the FT232R should be programmed to a value of zero

(self powered).

In order to comply with the first requirement above, the USB bus power (pin 1) is used to control the

RESET# pin of the FT232R device. When the USB host or hub is powered up an internal 1.5kΩ resistor on

USBDP is pulled up to +3.3V (generated using the 4K7 and 10k resistor network), thus identifying the

device as a full speed device to the USB host or hub. When the USB host or hub is powered off, RESET#

will be low and the FT232R is held in reset. Since RESET# is low, the internal 1.5kΩ resistor is not pulled

up to any power supply (hub or host is powered down), so no current flows down USBDP via the 1.5kΩ

pull-up resistor. Failure to do this may cause some USB host or hub controllers to power up erratically.

Figure 6.2 illustrates a self powered design which has a +4V to +5.25V supply.

Note:

1. When the FT232R is in reset, the UART interface I/O pins are tri-stated. Input pins have internal

200kΩ pull-up resistors to VCCIO, so they will gently pull high unless driven by some external

logic.

2. When using internal FT232R oscillator the VCC supply voltage range must be +4.0V to 5.25V.

3. When using external oscillator the VCC supply voltage range must be +3.3V to 5.25V

Any design which interfaces to +3.3 V or +1.8V would be having a +3.3V or +1.8V supply to

VCCIO.

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6.3 USB Bus Powered with Power Switching Configuration

FT232R

GND

100nF

VCC

USBDM

USBDP

VCCIO

RESET#

OSCI

OSCO

3V3OUT

TXD

RXD

RTS#

CTS#

DTR#

DSR#

DCD#

RI#

CBUS0

CBUS1

CBUS2

CBUS3

CBUS4

GND

SHIELD

GND

100nF 4.7uF +

10nF+

Ferrite Bead

s d

P-Channel Power

MOSFET

PWREN#

Switched 5V Power

To External Logic

Soft Start

Circuit

0.1uF 0.1uF

5V VCC

10K

Figure 6.3 Bus Powered with Power Switching Configuration

A requirement of USB bus powered applications, is when in USB suspend mode, the application draws a

total current of less than 2.5mA. This requirement includes external logic. Some external logic has the

ability to power itself down into a low current state by monitoring the PWREN# signal. For external logic

that cannot power itself down in this way, the FT232R provides a simple but effective method of turning

off power during the USB suspend mode.

Figure 6.3 shows an example of using a discrete P-Channel MOSFET to control the power to external

logic. A suitable device to do this is an International Rectifier (www.irf.com) IRLML6402, or equivalent. It

is recommended that a “soft start” circuit consisting of a 1kΩ series resistor and a 0.1μF capacitor is used

to limit the current surge when the MOSFET turns on. Without the soft start circuit it is possible that the

transient power surge, caused when the MOSFET switches on, will reset the FT232R or the USB host/hub

controller. The soft start circuit example shown in Figure 6.3 powers up with a slew rate of

approximaely12.5V/ms. Thus supply voltage to external logic transitions from GND to +5V in

approximately 400 microseconds.

As an alternative to the MOSFET, a dedicated power switch IC with inbuilt “soft-start” can be used. A

suitable power switch IC for such an application is the Micrel (www.micrel.com) MIC2025-2BM or

equivalent.

With power switching controlled designs the following should be noted:

i) The external logic to which the power is being switched should have its own reset circuitry to

automatically reset the logic when power is re-applied when moving out of suspend mode.

ii) Set the Pull-down on Suspend option in the internal FT232R EEPROM.

iii) One of the CBUS Pins should be configured as PWREN# in the internal FT232R EEPROM, and used

to switch the power supply to the external circuitry. This should be pulled high through a 10 kΩ

resistor.

iv) For USB high-power bus powered applications (one that consumes greater than 100mA, and up

to 500mA of current from the USB bus), the power consumption of the application must be set in

the Max Power field in the internal FT232R EEPROM. A high-power bus powered application uses

the descriptor in the internal FT232R EEPROM to inform the system of its power requirements.

v) PWREN# gets its VCC from VCCIO. For designs using 3V3 logic, ensure VCCIO is not powered

down using the external logic. In this case use the +3V3OUT.

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6.4 USB Bus Powered with Selectable External Logic Supply

FT232R

100nF 3V3OUT

VCCIO

RESET#

10nF

TXD

RXD

RTS#

CTS#

DTR#

DSR#

DCD#

RI#

CBUS0

CBUS3

CBUS2

CBUS1

USBDP

USBDM

VCC

OSCI

OSCO

CBUS4

Ferrite

Bead

SHIELD

GND

3.3V or 5V

Supply to

External Logic

100nF

Vcc

4.7uF

GND

Jumper

SLEEP#

PWREN#

Vcc

VCCIO

10K

VCCIO

Figure 6.4 USB Bus Powered with +3.3V or +5V External Logic Power Supply

Figure 6.4 illustrates a USB bus power application with selectable external logic supply. The external logic

can be selected between +3.3V and +5V using the jumper switch. This jumper is used to allow the

FT232R to be interfaced with a +3.3V or +5V logic devices. The VCCIO pin is either supplied with +5V

from the USB bus (jumper pins1 and 2 connected), or from the +3.3V output from the FT232R 3V3OUT

pin (jumper pins 2 and 3 connected). The supply to VCCIO is also used to supply external logic.

With bus powered applications, the following should be noted:

i) To comply with the 2.5mA current supply limit during USB suspend mode, PWREN# or

SLEEP# signals should be used to power down external logic in this mode. If this is not

possible, use the configuration shown in Section 6.3.

ii) The maximum current sourced from the USB bus during normal operation should not exceed

100mA, otherwise a bus powered design with power switching (Section 6.3) should be used.

Another possible configuration could use a discrete low dropout (LDO) regulator which is supplied by the

5V on the USB bus to supply between +1.8V and +2.8V to the VCCIO pin and to the external logic. In

this case VCC would be supplied with the +5V from the USB bus and the VCCIO would be supplied from

the output of the LDO regulator. This results in the FT232R I/O pins driving out at between +1.8V and

+2.8V logic levels.

For a USB bus powered application, it is important to consider the following when selecting the regulator:

i) The regulator must be capable of sustaining its output voltage with an input voltage of

+4.35V. An Low Drop Out (LDO) regulator should be selected.

ii) The quiescent current of the regulator must be low enough to meet the total current

requirement of <= 2.5mA during USB suspend mode.

A suitable series of LDO regulators that meets these requirements is the MicroChip/Telcom

(www.microchip.com) TC55 series of devices. These devices can supply up to 250mA current and have a

quiescent current of under 1μA.

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FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

7 Application Examples

The following sections illustrate possible applications of the FT232R. The illustrations have omitted pin

numbers for ease of understanding since the pins differ between the FT232RL and FT232RQ package

options.

7.1 USB to RS232 Converter

FT232R

GND

100nF

VCC

USBDM

USBDP

VCCIO

RESET#

OSCI

OSCO

3V3OUT

TXD

RXD

RTS#

CTS#

DTR#

DSR#

DCD#

RI#

CBUS0

CBUS1

CBUS2

CBUS3

CBUS4

GND

SHIELD

GND

100nF 4.7uF +

10nF +

Ferrite Bead

VCC

SLEEP#

GPIO2

GPIO3

TXD

RXD

RTS#

CTS#

DTR#

DSR#

DCD#

RI#

RS232 LEVEL

CONVERTER

TXDATA

RXDATA

RTS

CTS

DTR

DSR

DCD

TXLED#

RXLED#

VCC VCC

270R 270R

GND

DTR

CTS

TXDATA

RTS

RXDATA

DSR

DCD

DB9M

SHIELD 10

SHDN#

Figure 7.1 Application Example showing USB to RS232 Converter

An example of using the FT232R as a USB to RS232 converter is illustrated in Figure 7.1. In this

application, a TTL to RS232 Level Converter IC is used on the serial UART interface of the FT232R to

convert the TTL levels of the FT232R to RS232 levels. This level shift can be done using the popular “213”

series of TTL to RS232 level converters. These “213” devices typically have 4 transmitters and 5 receivers

in a 28-LD SSOP package and feature an in-built voltage converter to convert the +5V (nominal) VCC to

the +/- 9 volts required by RS232. A useful feature of these devices is the SHDN# pin which can be used

to power down the device to a low quiescent current during USB suspend mode.

A suitable level shifting device is the Sipex SP213EHCA which is capable of RS232 communication at up

to 500k baud. If a lower baud rate is acceptable, then several pin compatible alternatives are available

such as the Sipex SP213ECA, the Maxim MAX213CAI and the Analogue Devices ADM213E, which are all

suitable for communication at up to 115.2k baud. If a higher baud rate is required, the Maxim

MAX3245CAI device is capable of RS232 communication rates up to 1Mbaud. Note that the MAX3245 is

not pin compatible with the 213 series devices and that the SHDN pin on the MAX device is active high

and should be connect to PWREN# pin instead of SLEEP# pin.

In example shown, the CBUS0 and CBUS1 have been configured as TXLED# and RXLED# and are being

used to drive two LEDs.

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

7.2 USB to RS485 Coverter

FT232R

GND

100nF

VCC

USBDM

USBDP

VCCIO

RESET#

OSCI

OSCO

3V3OUT

TXD

RXD

RTS#

CTS#

DTR#

DSR#

DCD#

RI#

CBUS0

CBUS1

CBUS2

CBUS3

CBUS4

GND

SHIELD

GND

100nF 4.7uF +

10nF +

Ferrite Bead

Vcc

TXD

RXD

GND DB9M

SHIELD 10

TXDEN

GPO

PWREN#

GPIO0

GPIO1

VCCIO

10K

RS485 LEVEL

CONVERTER

Vcc

SP481

Link

120R

Figure 7.2 Application Example Showing USB to RS485 Converter

An example of using the FT232R as a USB to RS485 converter is shown in Figure 7.2. In this application,

a TTL to RS485 level converter IC is used on the serial UART interface of the FT232R to convert the TTL

levels of the FT232R to RS485 levels.

This example uses the Sipex SP481 device. Equivalent devices are available from Maxim and Analogue

Devices. The SP481 is a RS485 device in a compact 8 pin SOP package. It has separate enables on both

the transmitter and receiver. With RS485, the transmitter is only enabled when a character is being

transmitted from the UART. The TXDEN signal CBUS pin option on the FT232R is provided for exactly this

purpose and so the transmitter enable is wired to CBUS2 which has been configured as TXDEN. Similarly,

CBUS3 has been configured as PWREN#. This signal is used to control the SP481‟s receiver enable. The

receiver enable is active low, so it is wired to the PWREN# pin to disable the receiver when in USB

suspend mode. CBUS2 = TXDEN and CBUS3 = PWREN# are the default device configurations of the

FT232R pins.

RS485 is a multi-drop network; so many devices can communicate with each other over a two wire cable

interface. The RS485 cable requires to be terminated at each end of the cable. A link (which provides the

120Ω termination) allows the cable to be terminated if the SP481 is physically positioned at either end of

the cable.

In this example the data transmitted by the FT232R is also present on the receive path of the SP481.This

is a common feature of RS485 and requires the application software to remove the transmitted data from

the received data stream. With the FT232R it is possible to do this entirely in hardware by modifying the

example shown in Figure 7.2 by logically OR‟ing the FT232R TXDEN and the SP481 receiver output and

connecting the output of the OR gate to the RXD of the FT232R.

Note that the TXDEN is activated 1 bit period before the start bit. TXDEN is deactivated at the same time

as the stop bit. This is not configurable.

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

7.3 USB to RS422 Converter

FT232R

GND

100nF

VCC

USBDM

USBDP

VCCIO

RESET#

OSCI

OSCO

3V3OUT

TXD

RXD

RTS#

CTS#

DTR#

DSR#

DCD#

RI#

CBUS0

CBUS1

CBUS2

CBUS3

CBUS4-

GND

SHIELD

GND

100nF 4.7uF +

10nF +

Ferrite Bead

Vcc

PWREN#

RS422 LEVEL

CONVERTER

Vcc

SP491

TXDM

TXDP

RXDP

RXDM

120R

SLEEP#

RS422 LEVEL

CONVERTER

SP491

Vcc

10K

120R

10 RTSM

RTSP

CTSP

CTSM

GND DB9M

SHIELD

TXDM

TXDP

RXDP

RXDM

RTSM

RTSP

CTSP

CTSM

Figure 7.3 USB to RS422 Converter Configuration

An example of using the FT232R as a USB to RS422 converter is shown in Figure 7.3. In this application,

two TTL to RS422 Level Converter ICs are used on the serial UART interface of the FT232R to convert the

TTL levels of the FT232R to RS422 levels. There are many suitable level converter devices available. This

example uses Sipex SP491 devices which have enables on both the transmitter and receiver. Since the

SP491 transmitter enable is active high, it is connected to a CBUS pin in SLEEP# configuration. The

SP491 receiver enable is active low and is therefore connected to a CBUS pin PWREN# configuration. This

ensures that when both the SP491 transmitters and receivers are enabled then the device is active, and

when the device is in USB suspend mode, the SP491 transmitters and receivers are disabled. If a similar

application is used, but the design is USB BUS powered, it may be necessary to use a P-Channel logic

level MOSFET (controlled by PWREN#) in the VCC line of the SP491 devices to ensure that the USB

standby current of 2.5mA is met.

The SP491 is specified to transmit and receive data at a rate of up to 5 Mbaud. In this example the

maximum data rate is limited to 3 Mbaud by the FT232R.

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

7.4 USB to MCU UART Interface

FT232R

GND

100nF

VCC

USBDM

USBDP

VCCIO

RESET#

OSCI

OSCO

3V3OUT

TXD

RXD

RTS#

CTS#

DTR#

DSR#

DCD#

RI#

CBUS0

CBUS1

CBUS2

CBUS3

CBUS4

GND

SHIELD

GND

100nF 4.7uF +

10nF +

Ferrite Bead

Vcc

PWREN#

Vcc

12MHz

OUT

10K

Microcontroller

CLK_IN

I/O

RTS#

RXD

TXD

CTS#

Vcc

Figure 7.4 USB to MCU UART Interface

An example of using the FT232R as a USB to Microcontroller (MCU) UART interface is shown in Figure

7.4. In this application the FT232R uses TXD and RXD for transmission and reception of data, and RTS# /

CTS# signals for hardware handshaking. Also in this example CBUS0 has been configured as a 12MHz

output to clock the MCU.

Optionally, RI# could be connected to another I/O pin on the MCU and used to wake up the USB host

controller from suspend mode. If the MCU is handling power management functions, then a CBUS pin can

be configured as PWREN# and would also be connected to an I/O pin of the MCU.

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

7.5 LED Interface

Any of the CBUS I/O pins can be configured to drive an LED. The FT232R has 3 configuration options for

driving LEDs from the CBUS. These are TXLED#, RXLED#, and TX&RXLED#. Refer to Section 3.5 for

configuration options.

FT232R

CBUS[0...4]

VCCIO

TXLED#

RXLED#

270R 270R

Figure 7.5 Dual LED Configuration

An example of using the FT232R to drive LEDs is shown in Figure 7.5. In this application one of the CBUS

pins is used to indicate transmission of data (TXLED#) and another is used to indicate receiving data

(RXLED#). When data is being transmitted or received the respective pins will drive from tri-state to low

in order to provide indication on the LEDs of data transfer. A digital one-shot is used so that even a small

percentage of data transfer is visible to the end user.

FT232R

CBUS[0...4] TX&RXLED#

270R

VCCIO

LED

Figure 7.6 Single LED Configuration

Another example of using the FT232R to drive LEDs is shown in Figure 7.6. In this example one of the

CBUS pins is used to indicate when data is being transmitted or received by the device (TX&RXLED). In

this configuration the FT232R will drive only a single LED.

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

7.6 Using the External Oscillator

The FT232R defaults to operating using its own internal oscillator. This requires that the device is

powered with VCC(min)=+4.0V. This supply voltage can be taken from the USB VBUS. Applications which

require using an external oscillator, VCC= +3.3V, must do so in the following order:

1. When device powered for the very first time, it must have VCC > +4.0V. This supply is available

from the USB VBUS supply = +5.0V.

2. The EEPROM must then be programmed to enable external oscillator. This EEPROM modification

cannot be done using the FTDI programming utility, MPROG. The EEPROM can only be re-

configured from a custom application. Please refer to the following applications note on how to do

this:

http://www.ftdichip.com/Documents/AppNotes/AN_100_Using_The_FT232_245R_With_External_

Osc(FT_000067).pdf

3. The FT232R can then be powered from VCC=+3.3V and an external oscillator. This can be done

using a link to switch the VCC supply.

The FT232R will fail to operate when the internal oscillator has been disabled, but no external oscillator

has been connected.

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

8 Internal EEPROM Configuration

Following a power-on reset or a USB reset the FT232R will scan its internal EEPROM and read the USB

configuration descriptors stored there. The default factory programmed values of the internal EEPROM

are shown in Table 8.1.

Parameter

Value

Notes

USB Vendor ID (VID)

0403h

FTDI default VID (hex)

USB Product UD (PID)

6001h

FTDI default PID (hex)

Serial Number Enabled?

Yes

Serial Number

See Note

A unique serial number is generated and

programmed into the EEPROM during device final

test.

Pull down I/O Pins in USB

Suspend

Disabled

Enabling this option will make the device pull down

on the UART interface lines when in USB suspend

mode (PWREN# is high).

Manufacturer Name

FTDI

Product Description

FT232R USB UART

Max Bus Power Current

90mA

Power Source

Bus Powered

Device Type

FT232R

USB Version

0200

Returns USB 2.0 device description to the host.

Note: The device is a USB 2.0 Full Speed device

(12Mb/s) as opposed to a USB 2.0 High Speed

device (480Mb/s).

Remote Wake Up

Enabled

Taking RI# low will wake up the USB host controller

from suspend in approximately 20 ms.

High Current I/Os

Disabled

Enables the high drive level on the UART and CBUS

I/O pins.

Load VCP Driver

Enabled

Makes the device load the VCP driver interface for

the device.

CBUS0

TXLED#

Default configuration of CBUS0 – Transmit LED

drive.

CBUS1

RXLED#

Default configuration of CBUS1 – Receive LED drive.

CBUS2

TXDEN

Default configuration of CBUS2 – Transmit data

enable for RS485

CBUS3

PWREN#

Default configuration of CBUS3 – Power enable. Low

after USB enumeration, high during USB suspend

mode.

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

Parameter

Value

Notes

CBUS4

SLEEP#

Default configuration of CBUS4 – Low during USB

suspend mode.

Invert TXD

Disabled

Signal on this pin becomes TXD# if enable.

Invert RXD

Disabled

Signal on this pin becomes RXD# if enable.

Invert RTS#

Disabled

Signal on this pin becomes RTS if enable.

Invert CTS#

Disabled

Signal on this pin becomes CTS if enable.

Invert DTR#

Disabled

Signal on this pin becomes DTR if enable.

Invert DSR#

Disabled

Signal on this pin becomes DSR if enable.

Invert DCD#

Disabled

Signal on this pin becomes DCD if enable.

Invert RI#

Disabled

Signal on this pin becomes RI if enable.

Table 8.1 Default Internal EEPROM Configuration

The internal EEPROM in the FT232R can be programmed over USB using the FTDI utility program MPROG.

MPROG can be downloaded from FTDI Utilities on the FTDI website (www.ftdichip.com). Version 2.8a or

later is required for the FT232R chip. Users who do not have their own USB Vendor ID but who would like

to use a unique Product ID in their design can apply to FTDI for a free block of unique PIDs. Contact FTDI

support for this service.

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

9 Package Parameters

The FT232R is available in two different packages. The FT232RL is the SSOP-28 option and the FT232RQ

is the QFN-32 package option. The solder reflow profile for both packages is described in Section 9.5.

9.1 SSOP-28 Package Dimensions

Figure 9.1 SSOP-28 Package Dimensions

The FT232RL is supplied in a RoHS compliant 28 pin SSOP package. The package is lead (Pb) free and

uses a „green‟ compound. The package is fully compliant with European Union directive 2002/95/EC.

This package is nominally 5.30mm x 10.20mm body (7.80mm x 10.20mm including pins). The pins are

on a 0.65 mm pitch. The above mechanical drawing shows the SSOP-28 package.

All dimensions are in millimetres.

The date code format is YYXX where XX = 2 digit week number, YY = 2 digit year number. This is

followed by the revision number.

The code XXXXXXXXXXXX is the manufacturing LOT code. This only applies to devices manufactured

after April 2009.

12° Typ

0° - 8°

0.25

0.75 +/-0.20

0.09

2.00 Max

1.75

+/- 0.10

0.05 Min

1.25 +/-0.12

FT232RL

YYXX-A

14 15

FTDI

5.30 +/-0.30

7.80 +/-0.40

10.20 +/-0.30

1.02 Typ.

0.30 +/-0.012

0.65 +/-0.026

XXXXXXXXXXXX

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

9.2 QFN-32 Package Dimensions

Figure 9.2 QFN-32 Package Dimensions

The FT232RQ is supplied in a RoHS compliant leadless QFN-32 package. The package is lead ( Pb ) free,

and uses a „green‟ compound. The package is fully compliant with European Union directive 2002/95/EC.

This package is nominally 5.00mm x 5.00mm. The solder pads are on a 0.50mm pitch. The above

mechanical drawing shows the QFN-32 package. All dimensions are in millimetres.

The centre pad on the base of the FT232RQ is not internally connected, and can be left unconnected, or

connected to ground (recommended).

The date code format is YYXX where XX = 2 digit week number, YY = 2 digit year number.

The code XXXXXXX is the manufacturing LOT code. This only applies to devices manufactured after April

2009.

Indicates Pin #1

(Laser Marked)

FT232RQ

32 25

169

YYXX-A

5.000 +/-0.075

3.200 +/-0.100

0.500

0.250 +/-0.050

0.500 +/-0.050

0.150 Max

Pin #1 ID

0.900 +/

-0.100

0.200 0.050

2526272829303132

161514131211109

Note: The pin #1 ID is connected internally to the device’s central

heat sink area . It is recommended to ground the central heat sink

area of the device.

0.200 Min

Dimensions in mm.

Central

Heat Sink

Area

FTDI

XXXXXXX

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

9.3 QFN-32 Package Typical Pad Layout

Figure 9.3 Typical Pad Layout for QFN-32 Package

9.4 QFN-32 Package Typical Solder Paste Diagram

2.5 +/- 0.0375

Figure 9.4 Typical Solder Paste Diagram for QFN-32 Package

0.500

0.30

0.200 Min

0.500

+/-0.050

0.150 Max

0.20

0.100

3.200 +/-0.100

2.50

Optional GND

Connection

Optional GND

Connection

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

9.5 Solder Reflow Profile

The FT232R is supplied in Pb free 28 LD SSOP and QFN-32 packages. The recommended solder reflow

profile for both package options is shown in Figure 9.5.

Figure 9.5 FT232R Solder Reflow Profile

The recommended values for the solder reflow profile are detailed in Table 9.1. Values are shown for both

a completely Pb free solder process (i.e. the FT232R is used with Pb free solder), and for a non-Pb free

solder process (i.e. the FT232R is used with non-Pb free solder).

Profile Feature

Pb Free Solder Process

Non-Pb Free Solder Process

Average Ramp Up Rate (Ts to Tp)

3°C / second Max.

3°C / Second Max.

Preheat

- Temperature Min (Ts Min.)

- Temperature Max (Ts Max.)

- Time (ts Min to ts Max)

150°C

200°C

60 to 120 seconds

100°C

150°C

60 to 120 seconds

Time Maintained Above Critical Temperature

TL:

- Temperature (TL)

- Time (tL)

217°C

60 to 150 seconds

183°C

60 to 150 seconds

Peak Temperature (Tp)

260°C

240°C

Time within 5°C of actual Peak Temperature

(tp)

20 to 40 seconds

Ramp Down Rate

6°C / second Max.

Time for T= 25°C to Peak Temperature, Tp

8 minutes Max.

6 minutes Max.

Table 9.1 Reflow Profile Parameter Values

Critical Zone: when

T is in the range

T to T

Temperature, T (Degrees C)

Time, t (seconds)

25 P

T = 25º C to T

Preheat

Ramp Up Lp

Ramp

Down

T Max

T Min

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

10 Contact Information

Head Office – Glasgow, UK

Future Technology Devices International Limited

Unit 1, 2 Seaward Place

Centurion Business Park

Glasgow, G41 1HH

United Kingdom

Tel: +44 (0) 141 429 2777

Fax: +44 (0) 141 429 2758

E-mail (Sales) sales1@ftdichip.com

E-mail (Support) support1@ftdichip.com

E-mail (General Enquiries) admin1@ftdichip.com

Web Site URL http://www.ftdichip.com

Web Shop URL http://www.ftdichip.com

Branch Office – Taipei, Taiwan

Future Technology Devices International Limited (Taiwan)

2F, No 516, Sec. 1 NeiHu Road

Taipei 114

Taiwan, R.O.C.

Tel: +886 (0) 2 8791 3570

Fax: +886 (0) 2 8791 3576

E-mail (Sales) tw.sales1@ftdichip.com

E-mail (Support) tw.support1@ftdichip.com

E-mail (General Enquiries) tw.admin1@ftdichip.com

Web Site URL http://www.ftdichip.com

Branch Office – Hillsboro, Oregon, USA

Future Technology Devices International Limited (USA)

7235 NW Evergreen Parkway, Suite 600

Hillsboro, OR 97123-5803

USA

Tel: +1 (503) 547 0988

Fax: +1 (503) 547 0987

E-Mail (Sales) us.sales@ftdichip.com

E-Mail (Support) us.admin@ftdichip.com

Web Site URL http://www.ftdichip.com

Branch Office – Shanghai, China

Future Technology Devices International Limited (China)

Room 408, 317 Xianxia Road,

ChangNing District,

ShangHai, China

Tel: +86 (21) 62351596

Fax: +86(21) 62351595

E-Mail (Sales): cn.sales@ftdichip.com

E-Mail (Support): cn.support@ftdichip.com

E-Mail (General Enquiries): cn.admin1@ftdichip.com

Web Site URL: http://www.ftdichip.com

Distributor and Sales Representatives

Please visit the Sales Network page of the FTDI Web site for the contact details of our distributor(s) and

sales representative(s) in your country.

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

Appendix A – References

Useful Application Notes

http://www.ftdichip.com/Documents/AppNotes/AN232R-01_FT232RBitBangModes.pdf

http://www.ftdichip.com/Documents/AppNotes/AN_107_AdvancedDriverOptions_AN_000073.pdf

http://www.ftdichip.com/Documents/AppNotes/AN232R-02_FT232RChipID.pdf

http://www.ftdichip.com/Documents/AppNotes/AN_121_FTDI_Device_EEPROM_User_Area_Usage.pdf

http://www.ftdichip.com/Documents/AppNotes/AN_120_Aliasing_VCP_Baud_Rates.pdf

http://www.ftdichip.com/Documents/AppNotes/AN_100_Using_The_FT232_245R_With_External_Osc(FT_

000067).pdf

http://www.ftdichip.com/Resources/Utilities/AN_126_User_Guide_For_FT232_Factory%20test%20utility.

pdf

http://www.ftdichip.com/Documents/AppNotes/AN232B-05_BaudRates.pdf

http://www.ftdichip.com/Documents/InstallGuides.htm

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

Appendix B - List of Figures and Tables

List of Figures

Figure 2.1 FT232R Block Diagram ................................................................................................... 4

Figure 3.1 SSOP Package Pin Out and Schematic Symbol .......................................................... 7

Figure 3.2 QFN-32 Package Pin Out and schematic symbol .............................................................. 10

Figure 6.1 Bus Powered Configuration ........................................................................................... 23

Figure 6.2 Self Powered Configuration ........................................................................................... 24

Figure 6.4 USB Bus Powered with +3.3V or +5V External Logic Power Supply .................................... 26

Figure 7.1 Application Example showing USB to RS232 Converter ..................................................... 27

Figure 7.2 Application Example Showing USB to RS485 Converter .................................................... 28

Figure 7.3 USB to RS422 Converter Configuration ........................................................................... 29

Figure 7.4 USB to MCU UART Interface .......................................................................................... 30

Figure 7.5 Dual LED Configuration ................................................................................................ 31

Figure 7.6 Single LED Configuration .............................................................................................. 31

Figure 9.1 SSOP-28 Package Dimensions ....................................................................................... 35

Figure 9.2 QFN-32 Package Dimensions ......................................................................................... 36

Figure 9.3 Typical Pad Layout for QFN-32 Package .......................................................................... 37

Figure 9.4 Typical Solder Paste Diagram for QFN-32 Package ........................................................... 37

Figure 9.5 FT232R Solder Reflow Profile ........................................................................................ 38

List of Tables

Table 3.1 USB Interface Group ....................................................................................................... 7

Table 3.2 Power and Ground Group ................................................................................................. 8

Table 3.3 Miscellaneous Signal Group .............................................................................................. 8

Table 3.4 UART Interface and CUSB Group (see note 3) .................................................................... 9

Table 3.5 USB Interface Group ..................................................................................................... 10

Table 3.6 Power and Ground Group ............................................................................................... 11

Table 3.7 Miscellaneous Signal Group ............................................................................................ 11

Table 3.8 UART Interface and CBUS Group (see note 3) .................................................................. 12

Table 3.9 CBUS Configuration Control ........................................................................................... 13

Table 5.1 Absolute Maximum Ratings ............................................................................................ 17

Table 5.2 Operating Voltage and Current ....................................................................................... 18

Table 5.3 UART and CBUS I/O Pin Characteristics (VCCIO = +5.0V, Standard Drive Level) .................. 18

Table 5.4 UART and CBUS I/O Pin Characteristics (VCCIO = +3.3V, Standard Drive Level) .................. 18

Table 5.5 UART and CBUS I/O Pin Characteristics (VCCIO = +2.8V, Standard Drive Level) .................. 19

Table 5.6 UART and CBUS I/O Pin Characteristics (VCCIO = +1.8V, Standard Drive Level) .................. 19

Table 5.7 UART and CBUS I/O Pin Characteristics (VCCIO = +5.0V, High Drive Level) ......................... 19

Table 5.8 UART and CBUS I/O Pin Characteristics (VCCIO = +3.3V, High Drive Level) ......................... 19

Table 5.9 UART and CBUS I/O Pin Characteristics (VCCIO = +2.8V, High Drive Level) ......................... 20

Table 5.10 UART and CBUS I/O Pin Characteristics (VCCIO = +1.8V, High Drive Level) ....................... 20

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FT232R USB UART IC Datasheet Version 2.10

Clearance No.: FTDI# 38

Table 5.11 RESET# and TEST Pin Characteristics ............................................................................ 20

Table 5.12 USB I/O Pin (USBDP, USBDM) Characteristics ................................................................. 21

Table 5.13 EEPROM Characteristics ............................................................................................... 21

Table 5.14 Internal Clock Characteristics ....................................................................................... 21

Table 5.15 OSCI, OSCO Pin Characteristics – see Note 1 ................................................................. 22

Table 8.1 Default Internal EEPROM Configuration ............................................................................ 34

Table 9.1 Reflow Profile Parameter Values ..................................................................................... 38

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.10

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Appendix C - Revision History

Document Title: USB UART IC FT232R

Document Reference No.: FT_000053

Clearance No.: FTDI# 38

Product Page: http://www.ftdichip.com/FTProducts.htm

Document Feedback: Send Feedback

Version 0.90 Initial Datasheet Created August 2005

Version 0.96 Revised Pre-release datasheet October 2005

Version 1.00 Full datasheet released December 2005

Version 1.02 Minor revisions to datasheet December 2005

Version 1.03 Manufacturer ID added to default EEPROM configuration; Buffer sizes added January 2006

Version 1.04 QFN-32 Pad layout and solder paste diagrams added January 2006

Version 2.00 Reformatted, updated package info, added notes for 3.3V operation; June 2008

Part numbers, TID; added UART and CBUS characteristics for +1.8V;

Corrected RESET#; Added MTTF data;

Corrected the input switching threshold and input hysteresis values for VCCIO=5V

Version 2.01 Corrected pin-out number in table3.2 for GND pin18.

Improved graphics on some Figures.

Add packing details. Changed USB suspend current spec from 500uA to 2.5mA

Corrected Figure 9.2 QFN dimensions. August 2008

Version 2.02 Corrected Tape and Reel quantities.

Added comment “PWREN# should be used with a 10kΩ resistor pull up”.

Replaced TXDEN# with TXDEN since it is active high in various places.

Added lot number to the device markings.

Added 3V3 regulator output tolerance.

Clarified VCC operation and added section headed “Using an external Oscillator”

Updated company contact information. April 2009

Version 2.03 Corrected the RX/TX buffer definitions to be relative to the USB interface June 2009

Version 2.04 Additional dimensions added to QFN solder profile June 2009

Version 2.05 Modified package dimensions to 5.0 x 5.0 +/-0.075mm. December 2009

and Solder paste diagram to 2.50 x 2.50 +/-0.0375mm

Added Windows 7 32, 64 bit driver support

Added FT_PROG utility references

Added Appendix A-references.Figure 2.1 updated.

Updated USB-IF TID for Rev B

Version 2.06 Updated section 6.2, Figure 6.2 and the note, May 2010

Updated section 5.3, Table 5.13, EEPROM data retention time

Version 2.07 Added USB Certification Logos July 2010

Version 2.08 Updated USB-IF TID for Rev C April 2011

Version 2.09 Corrected Rev C TID number April 2011

Version 2.10 Table 3.9, added clock output frequency within ±0.7% March 2012

Edited Table 3.9, TXLED# and TXLED# Description

Added feedback links