RN131C/RM Roving Networks, RN131C/RM Datasheet - Page 13

• Manufacturer Part Number: RN131C/RM
• Description: WiFi / 802.11 Modules WiFly GSX 802.11b/g Mod Commercial Temp
• Manufacturer: Roving Networks

Specifications of RN131C/RM

• Product Category: WiFi / 802.11 Modules
• Rohs: yes
• Protocol Supported: 802.11 b/g
• Frequency Band: 2.4 GHz
• Data Rate: 11 Mbps, 54 Mbps
• Interface Type: SPI, UART
• Transmit Power (max): 18 dBm
• Antenna Connector Type: Chip, U.FL
• Operating Supply Voltage: 3.3 V
• Supply Current Transmitting: 210 mA
• Supply Current Receiving: 40 mA
• Maximum Operating Temperature: + 70 C
• Dimensions: 38 mm x 20 mm x 4 mm
• Minimum Operating Temperature: 0 C
• Modulation Technique: DSSS, OFDM
• Security: WEP, WPA, WPA2

Reset (Pin 5)
The RESET signal is used to reset the module and is active low. This pin has a built-in 100-kΩ pull up resistor. You do not
need to connect this; it can be left unconnected. To reset the module, apply a 3.3-V pulse for a minimum of 160 us.
Force Awake (Pin 9)
This signal forces the module to wake up from sleep. FORCE_AWAKE is an active-high signal. To wake the module, apply a
3.3-V pulse for a minimum of 250 us.
Achieving Lowest Power in Sleep Mode
To achieve the lowest power consumption (4 uA) in sleep mode, connect a weak pull-down (100 KΩ resistor to GND) on
pin 22 (DMA-TX).
If GPIO8 through GPIO4 are being used to drive an output, connect a 100-kΩ pull-down resistor. Any unused (no connect)
GPIO pins can be left floating.
For other GPIO lines, you do not need to use a pull down. The module already has an on-chip internal pull down (80 kΩ);
The power consumption in sleep mode without these signals connected to a pull down is 655 uA.
Sensor Interfaces
Inputs must not exceed 1.2 V. The sensitivity saturates at 400 mV.
Ad Hoc Mode & Restoring Factory Settings
Ad hoc mode is controlled with GPIO9 (pin 24). Roving Networks recommends that you connect pin 24 to a switch or
jumper connected to a pull up. When GPIO9 is driven high at power up, the module enters ad hoc mode. If GPIO9 is then
toggled low 5 times, the module will be restored to it’s initial factory default configuration. This feature is useful for cases
where the module is misconfigured and is no long responding.
www.rovingnetworks.com
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Pin 25: GPIO8
Pin 26: GPIO7
Pin 27: GPIO6
Pin 28: GPIO5
Pin 29: GPIO4
Version 3.2r 4/9/2012
RN -13 1-DS
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