Smart, simple solutions for the
12 most common design concerns
NXP I2C-bus solutions
2H 2011
I2C-bus: The serial revolution
By replacing complex parallel interfaces with a straightforward yet powerful serial
structure, the I2C-bus revolutionized chip-to-chip communications.
Invented by NXP (Philips) more than 30 years ago, the I2C-bus uses a simple two-wire
format to carry data one bit at a time. It performs inter-chip addressing, selection,
control, and data transfer. Speeds are up to 400 kHz (Fast-mode), 1 MHz (Fast-mode
Plus), 3.4 MHz (High Speed-mode), or 5 MHz (Ultra Fast-mode).
The I2C-bus shrinks the IC footprint and leads to lower IC costs. Plus, since far fewer
copper traces are needed, it enables a smaller PCB, reduces design complexity, and
lowers system cost.
SDA
SCL
uC
A0
A1
1010A2A1A0R/W
A2
New function address
1010011 R/W
New function address
as assigned
New
function
MCUMCU RTCLCDI/O A/D
D/A
I2C-bus devices are available in a wide range of functions. Each slave device has its own I2C-bus address, selectable using
address pins set high (1) or low (0). Information is transmitted byte by byte, and each byte is acknowledged by the receiver.
There can be multiple devices on the same bus, and more than one IC can act as master. The master role is typically played by a
microcontroller.
Parallel Interface I2C Serial Interface
MasterWrite data Slave
SDA
SCL
transmitter
PWS dataslave address data AA A receiver
SDA
SCL
transmitter
receiver
Read data
PRS dataslave address data AA A
< n data bytes >
last data byte
S = Start condition R/W = read/write
A = Acknowledge A = Not acknowledge P = Stop condition
The master always sends the clock
< n data >
bytes
NXP’s I2C peripherals portfolio is grouped into twelve families, one for each of the most common, everyday design
concerns.
General Purpose Input Output
(GPIO) expanders
Add different types
of inputs and outputs
Sensors and voltage
management
Digital temperature information
Clocks / RTCs
Digital time and/or calendar
Blinkers, dimmers,
drivers
For complete LED
control, including
LCD backlighting
I2C-controlled DIP switches
EEROMs / RAM combined with
general-purpose outputs
Intelligent Stepper Motor
Controllers
Easy and versatile control
Capacitive Sensor
Switch action without contact
Black-and-white LCD display drivers
Monochrome, character, shapes, dots
Tiny serial ADCs / DACs
Analog control and audio
Bus buffers and
voltage translators
Extenders, hubs, and repeaters
to support extra devices, longer
distances, bus-voltage translation,
or hazardous conditions
Bridge ICs,
bus controllers
Add extra, fully
featured I2C masters
More information
www.nxp.com/interface
Multiplexers and switches
Add advanced I2C networking
to allow more devices, backup,
hot-swap
GPIO
Expander
4-bit
PCA9536 4-bit I2C Fm TP GPIO with PU
PCA9537 4-bit I2C Fm TP GPIO with INT and RST
8-bit
PCA8574 8-bit I2C Fm QB GPIO with INT and PU
PCA8574A 8-bit I2C Fm QB GPIO with INT and PU
(Alternate address)
PCA9500 8-bit I2C Fm QB GPIO with PU and 2-K EEPROM
PCA9501 8-bit I2C Fm QB GPIO with INT, PU and 2-K EEPROM
PCA9502 8-bit I2C Fm/SPI TP GPIO with INT and RST
PCA9534 8-bit I2C Fm TP GPIO with INT
+ PCA9538 8-bit I2C Fm TP GPIO with INT and RST
+ PCA9554 8-bit I2C Fm TP GPIO with INT and PU
PCA9554A 8-bit I2C Fm TP GPIO with INT and PU (Alternate address)
PCA9557 8-bit I2C Fm TP GPIO with RST
PCA9574 8-bit I2C Fm LV VLT TP/OD GPIO with INT, RST, latch
and PU/PD
PCA9621 8-bit I2C Fm+ 65 mA OD GPO with RST
PCA9670 8-bit I2C Fm+ QB GPIO with RST and PU
PCA9672 8-bit I2C Fm+ QB GPIO with INT, RST and PU
PCA9674 8-bit I2C Fm+ QB GPIO with INT and PU
PCA9674A 8-bit I2C Fm+ QB GPIO with INT and PU (Alternate
address)
PCF8574 8-bit I2C Sm QB GPIO with INT and PU
PCF8574A 8-bit I2C Sm QB GPIO with INT and PU (Alternate
address)
16-bit
PCA6416A 16-bit I2C Fm LV VLT TP GPIO with INT and RST
PCA8575 16-bit I2C Fm QB GPIO with INT and PU
PCA9535 16-bit I2C Fm TP GPIO with INT
PCA9535A 16-bit I2C Fm LV TP GPIO with INT
PCA9535C 16-bit I2C Fm OD GPIO with INT
+ PCA9539 16-bit I2C Fm TP GPIO with INT and RST
PCA9539A 16-bit I2C Fm LV TP GPIO with INT and RST
PCA9539R 16-bit I2C Fm TP GPIO with INT and RST (state machine
only)
PCA9555 16-bit I2C Fm TP GPIO with INT and PU
PCA9555A 16-bit I2C Fm LV TP GPIO with INT and PU
PCA9575 16-bit I2C Fm LV VLT TP/OD GPIO with INT, RST, latch
and PU/PD
PCA9671 16-bit I2C Fm+ QB GPIO with RST and PU
PCA9673 16-bit I2C Fm+ QB GPIO with INT, RST and PU
PCA9675 16-bit I2C Fm+ QB GPIO with INT and PU
PCA-
L6416A
16-bit I2C Fm LV VLT TP/OD GPIO with INT, RST, latch
and PU/PD
PCA-
L9535A 16-bit I2C Fm LV TP/OD GPIO with INT, latch and PU/PD
PCA-
L9539A
16-bit I2C Fm LV TP/OD GPIO with INT, RST, latch and
PU/PD
PCA-
L9555A
16-bit I2C Fm LV TP/OD GPIO with INT, latch and PU/PD
(PU default)
PCF8575 16-bit I2C Fm QB GPIO with INT and PU
PCF8575C 16-bit I2C Fm OD GPIO with INT
40-bit
PCA9505 40-bit I2C Fm TP GPIO with INT, RST, OE and PU
PCA9506 40-bit I2C Fm TP GPIO with INT, RST and OE
PCA9698 40-bit I2C Fm+ TP/OD GPIO with INT, RST, OE and PU
I2C-bus product summary
Capacitive Sensor
8-channel touch switch + PCA/PCF8885 I2C FM Touch / Proximity Sensor for up to
28 keys
Stepper Motor
Controller
1 motor controller PCA9629 I2C Fm+ Stepper Motor Controller with TP
GPIO with INT and RST
Temp sensors
Local
LM75A I2C Fm TS local with ± 2 °C accuracy
LM75B I2C Fm TS local with ± 2 °C accuracy and SMBus
time-out
SE95 I2C Fm TS local with ± 1 °C accuracy
SE98A I2C Fm DDR TS local with ± 1 °C accuracy and
SMBus time-out
Local and EEP-
ROM SE97B I2C Fm DDR TS local with ± 1 °C accuracy, 2K SPD
and SMBus time-out
Local and remote
NE1617A I2C Fm TS local with ± 2 °C accuracy and remote
with ± 3 °C accuracy
SA56004 I2C Fm TS local with ± 2 °C accuracy and remote
with ± 1 °C accuracy
Local, remote,
and voltage
monitor
NE1619
I2C Fm TS local with ± 2 °C accuracy and remote
with ± 3 °C accuracy with voltage monitor
w(12, 5, 3.3, and 2.5 V, VCCP
, and VDD)
LED controllers
Dimmer
(2 PWM,
25 mA /
5 V)
PCA9530 2-channel I2C Fm OD LED dimmer with RST
PCA9531 8-channel I2C Fm OD LED dimmer with RST
PCA9532 16-channel I2C Fm OD LED dimmer with RST
PCA9533 4-channel I2C Fm OD LED dimmer
Blinker
(2 PWM,
25 mA /
5 V)
PCA9550 2-channel I2C Fm OD LED blinker with RST
PCA9551 8-channel I2C Fm OD LED blinker with RST
PCA9552 16-channel I2C Fm OD LED blinker with RST
PCA9553 4-channel I2C Fm OD LED blinker
8-segment SAA1064 16-channel I2C Sm current source/sink 4x8-
segment LED display
Controller
(PWM / Ch,
25 mA /
5 V)
PCA9632 4-channel I2C Fm+ low-power TP LED controller
PCA9633 4-channel I2C Fm+ TP LED controller with OE
PCA9634 8-channel I2C Fm+ TP LED controller with OE
+ PCA9635 16-channel I2C Fm+ TP LED controller with OE
+ PCA9685 16-channel I2C Fm+ TP LED controller with 12-bit
PWMs and OE
Controller
(PWM / Ch,
57 mA / 40 V)
PCA9952 16-channel I2C Fm+ HV CS LED controller with OE
PCA9955 16-channel I2C Fm+ HV CS LED controller
PCU9955 16-channel I2C UFm HV CS LED controller
Controller
(PWM / Ch,
100 mA /
40 V)
PCA9624 8-channel I2C Fm+ HV OD LED controller with OE
PCA9622 16-channel I2C Fm+ HV OD LED controller with OE
PCA9626 24-channel I2C Fm+ HV OD LED controller with OE
PCU9654 8-channel I2C UFm HV OD LED controller with OE
PCU9655 16-channel I2C UFm HV OD LED controller
PCU9656 24-channel I2C UFm HV OD LED controller with OE
LED ash
SSL3250A I2C Fm 500 mA sink dual LED ash with torch mode
SSL3252 I2C Fm 500 mA source dual LED ash with torch mode
Real-time clocks
Low-power
PCA8802 I2C Fm RTC for One Time Password genera-
tion and smart cards
PCF8523
I2C Fm+ Ultra low-power RTC with loss of
main power detect and auto battery switch
over
PCF8563 I2C Fm Ultra low-power clock/calendar
PCF8564A I2C Fm Ultra low-power clock/calendar and
COB
Normal
+ PCA8565 I2C Fm High temperature clock/calendar
-40°C…+125°C
PCF8583 I2C Sm Clock/calendar resolution: 0.01 s,
with 256x8 SRAM
PCF8593 I2C Sm Low-power clock/calendar resolution:
0.01 s
Temp-compen-
sated
PCF2127A I2C Fm High-accuracy, low-voltage RTC with
512x8 RAM
+ PCA/PCF2129(A) I2C Fm High-accuracy RTC
Decode table
Bus Speed Features
Sm 100 kHz Standard-mode I2C-bus LV Supply voltage <2.3 V
Fm 400 kHz Fast-mode I2C-bus TP Totem-pole (push-pull)
Fm+ 1 MHz Fast-mode Plus I2C-bus QB Quasi-bidirectional
HSm 3.4 MHz High Speed-mode I2C-bus OD Open drain
UFm 5 MHz Ultra Fast-mode I2C-bus CS Current source
INT Interrupt
+ AEC-Q100 compliance RST Reset
GPIO General Purpose I/O Expander OE Output enable
TS Thermal Sensor Latch Input latch
RTC Real Time Clock PU Pull-up resistors
LCD Liquid Crystal Display PU/PD Pull-up/pull-down resistors
DAC Digital Analog Converter HV Outputs >10 V
ADC Analog Digital Converter VLT Voltage Level Translator – 2 Supplies
COG Chip on Glass
Muxes and
switches
2-channel
PCA9540B 2-channel I2C Fm mux
PCA9542A 2-channel I2C Fm mux with INT
PCA9543A/B/C 2-channel I2C Fm switch with INT and RST (B and C Alternate
address)
2-to-1 demux
PCA9541A/01 2 to 1 I2C Fm demux with INT and RST
(channel 0 default)
PCA9541A/03 2 to 1 I2C Fm demux with INT and RST
(no channel default)
4-channel
PCA9544A 4-channel I2C Fm mux with INT
PCA9545A/B/C 4-channel I2C Fm switch with INT and RST (B and C
Alternate address)
PCA9546A 4-channel I2C Fm switch with RST
PCA9646 4-channel I2C Fm+ No Offset buffer/switch with RST
8-channel
PCA9547 8-channel I2C Fm mux with RST (channel 0 default)
PCA9548A 8-channel I2C Fm switch with RST
Bus buffers
Incremental Offset
PCA9510A I2C Fm Incremental Offset hot-swap bus buffer (no RTA)
PCA9511A I2C Fm Incremental Offset hot swap-bus buffer
PCA9512B I2C Fm Incremental Offset VLT hot swap bus buffer
PCA9513A I2C Fm Incremental Offset hot-swap bus buffer
(92 µA CS)
PCA9514A I2C Fm Incremental Offset hot-swap bus buffer
(0.8 V offset)
PCA9521 I2C Fm (1 MHz) HV Incremental Offset bus buffer
PCA9522 I2C Fm (1 MHz) HV Incremental Offset hot-swap
bus buffer
Amplier P82B715 I2C Fm HV bus extender
No Offset PCA9525 I2C Fm (1 MHz) No Offset bus repeater
PCA9605 I2C Fm+ No Offset bus repeater
Static Offset
(1 side)
P82B96 I2C Fm HV bus buffer
PCA9507 I2C Fm VLT DDC buffer with accelerator
PCA9508 I2C Fm VLT hot-swap bus repeater
PCA9509 I2C Fm 1.0V LV VLT bus buffer with current source
PCA9509A I2C Fm 0.8V LV VLT bus buffer with current source
PCA9509P I2C Fm 0.8V LV VLT bus buffer
PCA9517A I2C Fm 0.9V LV VLT bus repeater
PCA9519 4-channel version of PCA9509
PCA9527 I2C Fm DDC VLT buffer with accelerator and CEC
PCA9600 I2C Fm+ HV bus buffer
PCA9601 I2C Fm+ HV bus buffer with stronger 15 mA local side
drive to support multiple Fm+ slaves
Static Offset
(All sides)
PCA9515A I2C Fm bus repeater
PCA9516A I2C Fm 5-channel hub
PCA9518A I2C Fm expandable 5-channel hub
Voltage translator
(doesn’t isolate
capacitance)
GTL2000 22-bit I2C Fm+ VLT
GTL2002 2-bit I2C Fm+ VLT
GTL2003 8-bit I2C Fm+ VLT
GTL2010 10-bit I2C Fm+ VLT
PCA9306 Dual I2C/SMBus Fm+ VLT
NVT2001 1-bit I2C Fm+ VLT
NVT2002 2-bit I2C Fm+ VLT for I2C/SMBus applications
NVT2003 3-bit I2C Fm+ VLT for two power supply applications
NVT2004 4-bit I2C Fm+ VLT for SPI applications
NVT2006 6-bit I2C Fm+ VLT
NVT2008 8-bit I2C Fm+ VLT
NVT2010 10-bit I2C Fm+ VLT
LCD drivers
Character driver
PCF2113 I2C Fm 1/2-line, 12-character, 120-icon LCD
driver
PCF2116 I2C Sm 1/2-line, 24 characters per line, or 2/4
line, 12 characters per line
PCF2119 I2C Fm 1/2-line, 16-character, 160-icon LCD
driver
Graphic driver
PCF8531 I2C Fm 34 x 128-pixel LCD driver
PCF8578 I2C Sm Dot-matrix LCD driver (row/column)
PCF8579 I2C Sm Dot-matrix LCD driver (column)
PCF8811 I2C Hsm 80 x 128-pixel LCD driver
Segment driver
PCF8577C I2C Sm 64-segment LCD driver
PCF8566 I2C Sm 96-segment LCD driver
+ PCA/PCF85162 I2C Fm 128-segment LCD driver
+ PCA/PCF85176 I2C Fm 160-segment LCD driver
+ PCA/PCF85134 I2C Fm 240-segment LCD driver
+ PCA/PCF85133 I2C Fm 320-segment, COG LCD driver
+ PCA/PCF8536 I2C Fm 320-segment plus LED backlight
control
PCF8578 I2C Sm 384-segment LCD driver
+ PCA9620 I2C Fm 480-segment LCD driver
+ PCA/PCF85132 I2C Fm 640-segment COG LCD driver
+ PCA85232 I2C Fm 640-segment COG LCD driver
A/D-D/A
converters
8-bit ADC PCF8591 I2C Sm 4-channel ADC and 1-channel DAC
EEPROMs
2-kbit
PCF85102C I2C Sm 256 x 8-bit EEPROM (No programming time
control output)
PCF85103C I2C Sm 256 x 8-bit EEPROM (No programming time
control output with ALT address)
PCF8582C I2C Sm 256 x 8 EEPROM
PCF8570 I2C Sm 256 x 8-bit RAM
4-kbit
PCF8594C I2C Sm 1024 x 8-bit EEPROM
SL3S4001 I2C Fm 3.6K bit EEPROM with dual Gen2 RFID
interface
8-kbit
PCA24S08A I2C Fm 1024 x 8-bit EEPROM with access protec-
tion
PCF8598C I2C Sm 1024 x 8-bit EEPROM
DIP switch
PCA8550 I2C Fm 4-bit 1-of-2 mux & 5-bit EEPROM
PCA9558 I2C Fm 5-bit MP/1-bit latch & 6-bit EEPROM with
2K EEPROM and 8-bit GPIO
PCA9559 I2C Fm 5-bit mux/1-bit latch & 6-bit EEPROM
PCA9560 I2C Fm 2 x 5-bit mux/1-bit latch & 6-bit EEPROM
PCA9561 I2C Fm 4 x 6-bit mux & 6-bit EEPROM
Bridge and bus
controllers
Bridge
SC16IS740 I2C Fm/SPI-to-UART bridge with IrDA
SC16lS741 I2C Fm/SPI-to-UART bridge with IrDA
SC16IS750 I2C Fm/SPI-to-UART bridge with IrDA and GPIO
SC16IS752 I2C Fm/SPI-to-DUART bridge with IrDA and GPIO
SC16IS760 I2C Fm/SPI-to-UART bridge with IrDA and GPIO
SC16IS762 I2C Fm/SPI-to-DUART bridge with IrDA and GPIO
SC18IM700 UART-to-I2C Fm master bridge with GPIO
SC18IS600 SPI-to-I2C Fm master bridge, 4 M with GPIO
SC18IS602 I2C Fm slave-to-SPI master bridge
Controller
PCF8584 I2C Sm bus controller with bus snoop
PCA9564 I2C Fm bus controller
PCA9661 1-channel I2C Fm+ bus controller with 4 K-byte
buffer
PCA9663 3-channel I2C Fm+ bus controller with 4 K-byte
buffer per channel
PCA9665 I2C Fm+ bus controller with 68-byte buffer
PCA9665A I2C Fm+ bus controller with 68-byte buffer and
restart condition x
PCU9661 1-channel UFm bus controller with 4 K-byte buffer
PCU9669 1-channel Fm+ and 2-channel UFm bus controller
with 4 K-byte buffer per channel
Our I2C-bus website (www.nxp.com/interface)
is a valuable resource for device
information and training programs.
It gives you direct access to a comprehensive
handbook, application notes, information
about evaluation kits and training
materials, links to application and
design support, and more.
The I2C Fm+ development board
and daughter cards make it easy to
program new peripherals and are a quick
way to learn about the I2C-bus protocol.
OM13320 Fm+ Demonstration Kit which includes
the OM13260 Fm+ Development Board with two
OM13303 GPIO Target Boards and one each of
the OM13243 PCA9555 GPIO 16-bit and OM13257
LM75B Thermal Sensor daughter boards
OM6275
I²C 2005-1 evaluation board
OM6277
PCA9564 evaluation board
OM6293
PCA9600 daughter card for I²C 2005-1
OM6276
PCA9633 demo board
OM13285 PCA9629 stepper motor
demonstration board
OM11057 PCF8885/86 touch switch
with PCF8536 LCD/LED driver
Demo boards
e-Tools
OM6270 SPI/I2C-to-UART bridge demo (SC16IS750)
OM6271 SPI-to-I2C-master bridge demo (SC18IS600)
OM6272 UART-to-I2C-master bridge demo (SC18IM700)
OM6273 SPI/I2C-to-DUART/IrDA/GPIO demo (SC16IS752)
OM6274 I2C-to-SPI-master bridge demo (SC18IS602)
OM6275 I2C 2005-1 evaluation board
OM6276 PCA9633 demo board
OM6277 PCA9564 evaluation board
OM6278 I2C 2002-1A evaluation board
OM6281 PCA9698 daughter card for I2C 2005-1
OM6282 PCA9633 daughter card for I2C 2005-1
OM6285 I2C 2002-1A evaluation board without PC controller
board
OM6290 LCD driver evaluation board: PCF8576D, PCF2119,
PCF8531, PCA9633
OM6292 PCA21125, PCF8562 demoboard
OM6293 PCA9600 daughter card for I2C 2005-1
OM6297 PCF2123, PCF8562 demoboard
OM11051 PCF2127A demo board
OM11057 PCF8885/86 capacitive sensor and PCF8536
LCD/LED driver
OM13260 I2C Fm+ development board (RoHS)
OM13243 PCA9555 daughter card (RoHS)
OM13243 GPIO target board (RoHS)
OM13257 LM75B daughter card (RoHS)
OM13285 PCA9629 demo board
OM13320 I2C Fm+ development kit (RoHS)
OM6278
I²C 2002-1A evaluation board
© 2011 NXP Semiconductors N.V.
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the
copyright owner. The information presented in this document does not form part of any quotation or contract,
is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by
the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under
patent- or other industrial or intellectual property rights.
www.nxp.com/interface
Date of release: August 2011
Document order number: 9397 750 17144
Printed in the Netherlands
