User's Manual

Pin-out and Signal Description GS2100M Low Power WiFi Module Data Sheet
GS2100Mxx Device Pin-out
36 Confidential Preliminary GS2100M-DS-001212, Release 0.8
Notes:
1. Recommend 10K external pull up resistor to VRTC.
2. Should not be left floating. Connect 1M pull-down resistor if unused.
3. Pins with drive strength 4, 12, and 16 have one pull resistor (either up or down, not both),
which is enabled at reset.
4. This pin enables programming of the module. If GPIO31/PWM2 is high during reset or
power on, then the GS2100M will wait for Flash download via UART0 or SPI0 interface.
Route this pin on the base board so it can be pulled up to VIN_3V3 for programming the
module.
5. If I
2
C interface is used, provide 2K Ohm pull-ups, to VIN_3V3, for pins 25 and 26
(I2C_CLK and I2C_DATA).
6. CTS and RTS signals indicate it is clear to send or ready to send when they are LOW. If
signals are high, indicates device is not ready.
7. This pin is generally reserved for GainSpan use, but if a design requires to OTP during
production, then design must take into account connection to this pin. Otherwise, it should
be left as a No Connect.
8. In the Serial-to-WiFi firmware when using SPI interface this pin is the host wake-up signal
or the Ready to Send signal.
a. GPIO37 - when using SPI interface this pin is the host wake-up signal or the Ready to
Send signal.
38 JTAG_TMS VIN_3V3 Pull-up Digital Input JTAG Test Mode Select
39 JTAG_TRST_n VIN_3V3 Pull-down Digital Input
JTAG Test Mode Rest
(Active Low)
40 GND 0V Not Applicable Analog Port Ground
Table 7 GS2100Mxx Module Pin Signal Description (Continued)
Pins Name Voltage
Domain
Internal Bias after
Hardware Reset
Drive
Strength
(mA)
Signal State Description
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