RN -13 1-DS
RN-131G & RN-131C 802.11 b/g Wireless LAN Module
Features
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Qualified 2.4-GHz IEEE 802.11b/g transceiver
Ultra-low power: 4 uA sleep, 40 mA Rx, 210 mA Tx
High throughput, 1 Mbps sustained data rate with
TCP/IP and WPA2
Small, compact surface-mount module
On-board ceramic chip antenna and U.FL
connector for external antenna
8-Mbit flash memory and 128-KB RAM
UART hardware interface
10 general-purpose digital I/O pins
8 analog sensor interfaces
Real-time clock for wakeup and time stamping
Accepts 3.3-V regulated or 2 to 3 V battery
Supports ad hoc and infrastructure networking
modes
On board ECOS -OS, TCP/IP stacks
Wi-Fi Alliance certified for WPA2-PSK
FCC/CE/ICS certified and RoHS compliant.
Industrial (RN-131G) and commercial (RN-131C)
grade temperature options
Description
The RN-131 module is a standalone, embedded
wireless 802.11 b/g networking module. With its small
form factor and extremely low power consumption, the
RN-131 is perfect for mobile wireless applications such
as asset monitoring, GPS tracking, and battery sensors.
The WiFly module incorporates a 2.4-GHz radio,
processor, TCP/IP stack, real-time clock, crypto
accelerator, power management, and analog sensor
interfaces as shown in Figure 1. The module is
preloaded with software to simplify integration and
minimize application development. In the simplest
configuration, the hardware requires only four
connections (PWR, TX, RX, and GND) to create a
wireless data connection. Additionally, the sensor
interface provides temperature, audio, motion,
acceleration, and other analog data without requiring
additional hardware. The module is programmed and
controlled with a simple ASCII command language.
Once the module is set up, it can scan to find an access
point, associate, authenticate, and connect over any
Wi-Fi network.
Applications
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Remote equipment monitoring
Telemetry
Industrial sensors and home automation controls
Medical device monitoring
Figure 1. RN-131 Block Diagram
RN-131
On-Board Chip
Antenna
2.4 GHz
TX/RX
128-KB
RAM
2.4-GHz
Radio
U.FL Connector
for Optional External
Antenna
2.4-GHz
PA
Crypto
accelerator
Sensor Interface
32-Bit
CPU
2-MB ROM
Flash
Memory
Timers
SPI
GPIO
UART
VDD IN
VDD BATT
2-KB NVM
802.11 b/g
MAC/PHY
SPI
ADC
Pwr
Mgmt
EPC/RFID
GPIO
SDIO
3.3-V Boost
Regulator
Boost
Enable
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RN -13 1-DS
OVERVIEW
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Host data rate up to 1 Mbps for the UART
Intelligent, built-in power management with programmable wakeup
Real-time clock for time stamping, auto-sleep, and auto-wakeup
Configuration over UART using simple ASCII commands
Remote configuration over WiFi using Telnet
Supports over the air firmware upgrade (FTP)
Supports WPS pushbutton mode for easy association with access points
Secure WiFi authentication using WEP-128, WPA-PSK (TKIP), or WPA2-PSK (AES)
Built-in networking applications—DHCP, UDP, DNS, ARP, ICMP, TCP, HTTP client, and FTP client
802.11 power saving and roaming functions
The modules size and weight are:
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Size—1.49”
x 0.78” x 0.15” (37mm x 20 mm x 3.5 mm)
Weight—0.140
oz
Tables 1 through 4 provide detailed specifications for the module.
Table 1. Environmental Conditions
Parameter
Temperature Range (Operating)
Temperature Range (Storage)
Relative Humidity (Operating)
Relative Humidity (Storage)
RN-131G
-30 C to +85 C
-40 C to +85 C
≤
90%
≤
90%
o
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RN-131C
0 C to +70 C
-40 C o +85 C
≤
90%
≤
90%
o
o
o
Table 2. Electrical Characteristics
Supply Voltage
Supply voltage VDD
Supply voltage (VBATT option)
Pin 21 switched 3.3 V output
Digital input
Input logic high VIH
Input logic low VIL
Digital output drive
GPIO 4, 5, 6, 7, 8
GPIO 9, 10, 11, 12, 13
Power consumption
Sleep
Standby (doze)
Connected (idle, RX)
Connected (TX)
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4
15
40
140
212
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uA
mA
mA
mA
24
8
mA
mA
Min
3.0
2.0
Typ.
3.3
3.0
Max.
3.7
3.3
150
2.3 V
1.0 V
Unit
VDC
VDC
mA
VDC
VDC
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RN -13 1-DS
Table 3. Analog Sensor Inputs
Parameter
Sense 0,1,2,3 wakeup detect threshold
AD sense 0 - 7 measurement range
Precision
Accuracy
Minimum conversion time
Sensor Power (pin 33) output resistance 3.3 V
500 mV
0 - 400 mV
14 bits = 12 uV
5% un-calibrated, 0.01% calibrated
35uS (5kHz over Wi-Fi)
10 ohms, max current = 50 mA
Value
Table 4. Radio Characteristics
Parameter
Frequency
Modulation
Channel intervals
Channels
Transmission rate (over the air)
Receive sensitivity
Output level (class 1)
Maximum RF input to U.FL connector
2,402 to 2,480 MHz
802.11b compatibility: DSSS (CCK-11, CCK-5.5, DQPSK-2, DBPSK-1)
802.11g: OFDM (default)
5 MHz
1 - 14
1 – 11 Mbps for 802.11b / 6 – 54 Mbps for 802.11g
-85 dBm typ.
+18 dBm
10 dBm
Specifications
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Version 3.2r 4/9/2012
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RN -13 1-DS
TYPICAL APPLICATION SCHEMATIC
Figure 2 shows a typical application schematic.
Figure 2. Application Schematic
P3_3V
LED_RED
LED_GREEN
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RN -13 1-DS
Figure 3 shows the pin pads and Table 5 describes the pins.
Figure 3. Pin Pads
44 43 42 41 40 39 38 37 36
1
2
3
4
5
6
7
8
9
10
11
12
13
14 15 16 17 18 19 20 21 22
Top View
(Pads Not Visible from Top)
35
34
33
32
31
30
29
28
27
26
25
24
23
Table 5. Pin Description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Name
SENSOR 6
SENSOR 4
SENSOR 5
SENSOR 7
RESET
EPC-ANT-A
EPC-ANT-B
SUPERCAP
FORCE_AWAKE
GPIO-13
GPIO-12
UART-RX
UART-TX
Not used
Not used
Not used
3.3V-REG-OUT
3.3V-REG-IN
GND
VDD-BATT
VDD-IN
Description
Sensor interface, analog input to module, 1.2 V.
Sensor interface, Analog input to module, 1.2 V.
Sensor interface, Analog input to module, 1.2 V.
Analog input to module, 1.2 V.
Module reset, active low, reference to VDD-BATT, 160 usec pulse.
EPC port, RFID antenna A.
EPC port, RFID antenna B.
Balance center pin voltage on stacked super capacitors, analog 3.3 V.
Force the module to wakeup, input to module, 250 us min. pulse.3.3 V.
UART RTS flow control, 8-mA drive, 3.3-V tolerant.
UART CTS flow control, 8-mA drive, 3.3-V tolerant.
INPUT: RX in to the module, 3.3-V tolerant.
OUTPUT: TX out from the module, 8-mA drive, 3.3-V tolerant.
Not applicable
Not applicable
Not applicable
Boost regulator control output, connect to 3.3V-REG-IN to enable.
Boost regulator control input, connect to 3.3V-REG-OUT to enable.
Ground.
Battery input. 2.0 to 3.3 V with boost regulator in use, otherwise use 3.0
to 3.7 V.
3.3 to 3.7 voltage. Do not connect when boost regulator is in use.
Default
No connect
No connect
No connect
No connect
Pull up
No connect
No connect
No connect
–
–
–
–
–
No connect
No connect
No connect
No connect
GND to disable
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–
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Version 3.2r 4/9/2012
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