RN-24 / RN25
www.rovingnetworks.com
rn-24-ds v2.3 8/23/2010
809 University Avenue • Los Gatos, CA 95032 • Tel (408) 395-6539 • info@RovingNetworks.com
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Class 1 Bluetooth® Super
Module
Features
• Bluetooth 2.1/2.0/1.2/1.1 and v2.0+EDR
• Embedded SPP/DUN stack support, no host or
processor stacks required
• Small-form factor 24 Pin DIP package (0.1”
pitch by 0.9” socket width)
• Accepts 4Vdc to 24Vdc power (RN-24)
• Hardware TTL, RS- 232 and RS-485 levels
• RS-485 signaling with auto-direction control
(RN25 only)
• UART baud rate: 1200bps up to 921.6Kbps
• 9 General Purpose Input/Output Pins (4ma
source/sink) controlled via remote commands
• 2 Channel 8 Bit AD converter (5Hz, 0-1.8VDC )
• LEDs indicate connection and RX/TX status
• On board antenna or external SMA jack
• Low power consumption (30mA connected,,
<10mA sniff mode)
• Programmable over local UART and Bluetooth
• Simple ACSII command interface
• UART (SPP or HCI) and USB (HCI only) data
connection interfaces
• Sustained SPP data rates - 240Kbps (slave),
300Kbps (master)
• Embedded Bluetooth stack profiles included
(requires no host stack): GAP, SDP, RFCOMM
and L2CAP protocols, with SPP and DUN profile
support.
Applications
• Wireless RS232/RS485 cable replacement
• Remote equipment monitoring
• Scanners, GPS and measurement systems
• Industrial sensors and controls
• Medical devices
Description
The RN24 transforms your product’s serial
interface into a wireless connection. The RN24 is a
Class 1 Bluetooth radio with auto-connect and
connect on RX data features, enabling your product
to transfer data up to 100M. The RN24 accepts a
wide range of unregulated DC power. The DIP
packaging with GPIO, UART interfaces and AD
converter makes it the perfect prototyping module
and allows products to have optional Bluetooth
capability when the module is plugged in.
The RN-25 has the same powerful Bluetooth
radio and simple ASCI command interface as the
RN-24 but has a RS-485 hardware interface rather
than RS-232.
Block Diagram
CSR BlueCore-04
External
BALUN
PA
RF
Switch
Crystal
Flash
Memory
GND
VCC
USB
UART
PCM
PIO6
PIO5
PIO4
DS-RN24_V3 8/23/2010
809 University Avenue • Los Gatos, CA 95032 • Tel (408) 395-6539 • info@RovingNetworks.com
Overview
UART baud rate speeds: 1200bps up to 921Kbps, non-standard baud rates can be programmed.
Class 1 radio, 330’ (100m) distance, 12dBm output transmitter, -80dBm typical receive sensitivity
Frequency 2402 ~ 2480MHz,
FHSS/GFSK modulation, 79 channels at 1MHz intervals
Secure communications, 128 bit encryption
Error correction for guaranteed packet delivery
UART local and over-the-air RF configuration
Auto-discovery/pairing requires no software configuration (instant cable replacement).
Auto-connect master, IO pin (DTR) and character based trigger modes
Environmental Conditions
Parameter
Value
Temperature Range (Operating)
-40
o
C ~ 85
o
C
Temperature Range (Storage) -40
o
C ~ 85
o
C
Relative Humidity (Operating) ≤90%
Relative Humidity (Storage) ≤90%
Electrical Characteristics
RN24
WARNING – Only one source of power must
be supplied.
3.3VDC nominal
or
5-24VDC unregulated
Parameter
Min
Typ.
Max.
Unit
Supply Voltage (DC) using pin 3 3.0 3.3 3.6 V
Supply Voltage (DC) using pin 12
5 - 24 V
RX Supply Current 35 60 mA
TX Supply Current 65 100 mA
NOTE: do not exceed 5 VDC on the RN-25 or permanent damage
to the module will occur!
RN25
5 VDC unregulated on pin12
Parameter
Min
Typ.
Max.
Unit
Supply Voltage (DC) using pin 3 - - -
Supply Voltage (DC) using pin 12
5 - 5 V
RX Supply Current 35 60 mA
TX Supply Current 65 100 mA
Average power consumption
Min
Typ.
Max.
Unit
Standby/Idle (default settings) 25 mA
Connected (normal mode) 30 50 mA
Connected (low power Sniff) 8 mA
Standby/Idle (lowest power) 250uA 2.5 mA
DS-RN24_V3 8/23/2010
809 University Avenue • Los Gatos, CA 95032 • Tel (408) 395-6539 • info@RovingNetworks.com
Digital I/O Characteristics
WARNING: Take care not to exceed the voltage limits to the VCC, TTL SERIAL, and GPIO pins. 0 negative
voltage or voltage exceeding 3.30 VDC can permanently damage the device!
• Use a 10KΩ series resistor on inputs
• GPIO sink current is 4mA max.
• Unused pins should float
2.7V
≤ VDD ≤ 3.0V
Min
Typ.
Max.
Unit
Input logic level LOW -0.4 - +0.8 V
Input logic level HIGH 0.7VDD - VDD+0.4 V
Output logc level LOW - - 0.2 V
Output logic level HIGH VDD-0.2 - - V
All I/O’s (except reset) default to weakpull down
+0.2 +1.0 +5.0 uA
The RN24 can drive either UART signals on the TTL pins 8-11 or RS232 pins 13-16. WARNING: Driving the TTL
signals at RS232 levels can permanently damage the module. By default the module is configured to drive only
the RS232 pins. To drive the TTL signals you must remove the resistor R7. R7 can be found on the bottom of
the board, near the center.
Remove R7 to enable the UART
TTL signaling on pins 8-11.
This disconnects pins 13-16 from
the UART interface.
DS-RN24_V3 8/23/2010
809 University Avenue • Los Gatos, CA 95032 • Tel (408) 395-6539 • info@RovingNetworks.com
Pin Description
NOTE:
The Power can be applied to
either pin 12, or pin 3, but NOT both.
If pin 12 is powered then Pin 3 can be
used as a 3.3V regulated supply
output up to 200mA.
Pin
Name
Description
Default
1 RESET Active HIGH Has 1K pulldown
2 GND
3 VCC 3.3VDC power Mutually exclusive with Pin 12
4 SPI_CS Programming Only No Connect
5 SPI_CK Programming Only
No Connect
6 SPI_MO Programming Only
No Connect
7 SPI_MI Programming Only
No Connect
8 CTS Input, if set HIGH disables transmitter TTL input
9 TX Transmit, output from the module TTL output
10 RTS Output, goes HIGH to disable host transmitter TTL output
11 RX Receive, input to the module TTL input
12 VDD RN-24 : 5-24V unregulated DC power
RN-25 : 5 V unregulated DC power
Mutually exclusive with Pin 3
13 UART_TX UART Transmit, output from the module RS-232 level signaling
14 UART_RX UART Receive, input to the module RS-232 level signaling
15 UART_RTS Output, goes HIGH to disable host transmitter RS-232 level signaling
16 UART_CTS Input, if set HIGH disables module transmitter RS-232 level signaling
17 GPIO-7 Default baud rate, HIGH = 9600, LOW = 115K Input to RN24, default = LOW
18 GPIO-6 Enable auto master mode = HIGH Input to RN24, default = LOW
19 GPIO-4 Restore factory defaults Set HIGH then toggle for 5
msec. 3 times
20 GPIO-3 Enable instant cable mode = HIGH Input to module, default = LOW
21 GPIO-2 Connection status, connected=HIGH Output from module
22 RS-485 D+ RS485 signaling
(Only on RN25)
(Auto direction detect)
23 RS-485 D- RS485 signaling
(
Only on RN25)
(Auto direction detect)
24 GND Ground
25 GPIO-11
26 GPIO-8 Controls red LED
27 GPIO-9 Controls yellow LED
28 GPIO-10
29 AD1 Optional analog input 0-1.8V Requires special firmware
30 AD2 Optional analog input 0-1.8V Requires special firmware
31 NC
32 GND Ground
RN24/RN25
1
2
3
4
5
6
7
8
9
10
11
12
Top view
24
23
22
21
20
19
18
17
16
15
14
13
32 31 30 29 28 27 26 25
RN24/RN25
1
2
3
4
5
6
7
8
9
10
11
12
Top view
24
23
22
21
20
19
18
17
16
15
14
13
32 31 30 29 28 27 26 25
DS-RN24_V3 8/23/2010
809 University Avenue • Los Gatos, CA 95032 • Tel (408) 395-6539 • info@RovingNetworks.com
Module Dimensions
Connect with 24 pin DIP (through-hole) 0.1” pitch and 0.9” wide socket
Single row mating sockets use:
Digikey P/N: ED7012-ND (female)
ED7512-ND (male)
1500 mil
65 mil
Antenna
200 mil
1500 mil
65 mil
Antenna
200 mil
1
2
3
4
5
6
7
8
9
10
11
12
RN24/RN25
RN24-E/RN25-E
Top view
24
23
22
21
20
19
18
17
16
15
14
13
32 31 30 29 28 27 26 25
1400 mil
320 mil
100 mi
LED
LED
LED
230 mil
900 mil
110 mil
1
2
3
4
5
6
7
8
9
10
11
12
RN24/RN25
RN24-E/RN25-E
Top view
24
23
22
21
20
19
18
17
16
15
14
13
32 31 30 29 28 27 26 25
1400 mil
320 mil
100 mi
LED
LED
LED
230 mil
900 mil
110 mil
1500 mil
245 mil
RN24/RN25
RN24-S/RN25-S
Top view
24
23
22
21
20
19
18
17
16
15
14
13
32 31 30 29 28 27 26 25
1000 mil
LED
LED
LED
80 mil diameter
Mounting hole
Keep metallic components,
connec tors, copper traces,
and ground planes away from
antenna area
1600 mil
1
2
3
4
5
6
7
8
9
10
11
12
245 mil
RN24/RN25
RN24-S/RN25-S
Top view
24
23
22
21
20
19
18
17
16
15
14
13
32 31 30 29 28 27 26 25
1000 mil
LED
LED
LED
80 mil diameter
Mounting hole
Keep metallic components,
connec tors, copper traces,
and ground planes away from
antenna area
1600 mil
1
2
3
4
5
6
7
8
9
10
11
12
DS-RN24_V3 8/23/2010
809 University Avenue • Los Gatos, CA 95032 • Tel (408) 395-6539 • info@RovingNetworks.com
Design Concerns
1. Reset circuit. RN-24 contains a 1k pulldown, the polarity of reset is ACTIVE HIGH.
A power on reset circuit with delay is OPTIONAL on the reset pin of the module. It should only be required if the
input power supply has a very slow ramp, or tends to bounce or have instability on power up. Often a
microcontroller or embedded CPU IO is available to generate reset once power is stable
2. Factory reset PIO4. It is a good idea to connect this pin to a switch, or jumper, or resistor, so it can be
accessed. This pin can be used to reset the module to FACTORY DEFAULTS and is often critical in situations
where the module has been mis-configured.
3. Connection status. PIO2 is an output which directly reflects the connection state, it goes HIGH when
connected, and LOW otherwise.
4. RS485 support. Must supply 5V on pin 12 if using the RS485 interface. Do not exceed 5VDC or permanent
damage to the module will occur!
RS-485 signaling with auto-direction control is ONLY supported on PCB rev 4 and later. Treat pins 22 and 23 as
no connect on previous PCB boards.
5. Using SPI bus for flash upgrade. While not required, this bus is very useful for configuring advanced
parameters of the Bluetooth modules, and is required for upgrading the firmware on modules. The suggested ref-
design shows a 6pin header which can be implemented to gain access to this bus. A minimum-mode version
could just use the SPI signals (4pins) and pickup ground and VCC from elsewhere on the design.
6. Minimizing Radio interference. When integrating the RN24 DIP module with on board chip antenna besure the
area around the chip antenna end of RN24-S module protrudes at least 5mm from the PCB and any metal
enclosure. If this is not possible use the RN24-E.
7. Soldering Reflow Profile.
• Lead-Free Solder Reflow
• Temp: 230 degree C , 30-40 seconds, Peak 250 degree C maximum.
• Preheat temp: 165 +- 15 degree C, 90 to 120 seconds.
• Time: Single Pass, One Time
8. Connecting to the GPIO. Placing 3.3Vdc into the PIO’s while they are set as outputs will permanently damage
the radio. The failure mode is short across GND and VCC. Use a 10KO resistor is series or a 10KO pull up
resistor for input and output PIO’s respectively.
• Make sure to connect a common ground when using the external TX, RX inputs on the 0 – 3.3Vdc
• For a 3 wire DB-9 interface (tx, rx, gnd only) connect/short CTS to RTS, Factory default is hardware flow
control enabled CTS and RTS connected.
• When using a 5.0Vdc Input, PIO’s require a 10K ohm series resistor. PIO’s are 0-3.3Vdc not 5 volt tolerant.
Compliance Information
• FCC Certified, FCC ID T9J-RN24, IC number6514A-RN24
• Environmentally friendly RoHS compliant
DS-RN24_V3 8/23/2010
809 University Avenue • Los Gatos, CA 95032 • Tel (408) 395-6539 • info@RovingNetworks.com
Ordering Information
Part Number Description
RN-24-S With chip antenna
RN-24-E With SMA jack
RN-25-S RS485 signaling with chip antenna
RN-25-E RS485 signaling with SMA jack
RN-SMA-S 1” external antenna “Stuby”
RN-SMA-4 4” high performance antenna
For other configurations, contact Roving Networks directly.
Visit http://www.rovingnetworks.com for current pricing and a list of distributors carrying our products.
Copyright © 2009 Roving Networks. All rights reserved.
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documentation and services at any time. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete.
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with customer products and applications, customers should provide adequate design and operating safeguards.
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unless officers of the parties have executed an agreement specifically governing such use.