Pin Name I/O Description
1 GND - Power supply and signal ground. Connect to the host circuit board ground.
2 DIAG_TX O Diagnostic serial port output.
3 DIAG_RX I Diagnostic serial port input.
4 GPIO0 I/O Configurable digital I/O port 0. An internal weak pull up is provided when configured as an input.
5 RADIO_TXD O Serial data output from the radio.
6 RADIO_RXD I Serial data input to the radio.
7 /HOST_CTS O UART/SPI flow control output. The module sets this line low to indicate it is ready to accept data from the host
on the RADIO_RXD or MOSI input. When the module sets this line high, the host must stop sending data.
8 /HOST_RTS I UART flow control input. The host sets this line low to allow data to flow from the module on the RADIO_TXD
pin. When the host sets this line high, the module will stop sending data to the host.
9 PWM0 O 16-bit pulse-width modulated output 0 with internal low-pass filter. Filter is first-order, with a 159 Hz 3 dB
bandwidth, 10K output resistance.
10 GPIO2 I/O Configurable digital I/O port 2. An internal weak pull up is provided when configured as an input.
11 GPIO1 I/O Configurable digital I/O port 1. An internal weak pull up is provided when configured as an input.
12 GPIO3 I/O Configurable digital I/O port 3. An internal weak pull up is provided when configured as an input.
13 RSVD - Reserved pin. Leave unconnected.
14 VCC I Power supply input, +3.0 to +3.63 Vdc.
15 GND - Connect to the host circuit board ground.
16 GND - Connect to the host circuit board ground.
17 /RESET I Active low module hardware reset.
18 ADC0 I 10-bit ADC input 0. ADC full scale reading can be referenced to the module’s +1.8 V regulated supply.
19 ADC1 I 10-bit ADC input 1. ADC full scale reading can be referenced to the module’s +1.8 V regulated supply.
20 MISO I/O SPI master in, slave out function. This pin is an input when the module is operating as a master, and is an
output when the module is operating as a slave.
21 MOSI I/O SPI master out, slave in function. This pin is an output when the module is operating as a master, and is an
input when the module is operating as a slave.
22 /SS I/O SPI active low slave select. This pin is an output when the module is operating as a master, and an input
when it is operating as a slave.
23 SCLK I/O SPI clock signal. This pin is an output when operating as a master, and an input when operating as a slave.
24 3.3V_OUT O Module’s +3.3 V regulated supply, available to power external sensor circuits. Current drain on this output
should be no greater than 50 mA.
25 ADC_REF O Module’s +1.8 V regulated supply, used for ratiometric ADC readings. Current drain on this output should be
no greater than 10 mA.
26 WAKE_IN I Active high interrupt input to wake the module from timer sleep. Can be used to wake module on event, etc.
27 WAKE_OUT O Active high output asserted when module wakes from timer sleep. Can be used to wake an external device.
28 GND - Connect to the host circuit board ground plane.
29 RSVD - Reserved pin. Leave unconnected.
30 GND - Connect to the host circuit board ground plane.
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WSN802G I/O Pad Descriptions