3131A-S
FN-LINK TECHNOLOGY LIMITED 7 Proprietary & Confidential Information
17 SDIO_DATA_CLK I SDIO clock line
18 SDIO_DATA_0 I/O SDIO data line 0
19 SDIO_DATA_1 I/O SDIO data line 1
20 GND － Ground connections
21 NC － Floating (Don’t connected to ground)
22 VDDIO P I/O Voltage supply input 1.8V
23 NC － Floating (Don’t connected to ground)
24 RTC_CLK I Exteral 32.768Khz clock input for Power saving
25 NC － Floating (Don’t connected to ground)
26 NC － Floating (Don’t connected to ground)
27 NC － Floating (Don’t connected to ground)
28 NC － Floating (Don’t connected to ground)
29 NC － Floating (Don’t connected to ground)
30 NC － Floating (Don’t connected to ground)
31 GND － Ground connections
32 NC － Floating (Don’t connected to ground)
33 GND － Ground connections
34 GPIO2 I/O Floating (Don’t connected to ground)
35 NC － Floating (Don’t connected to ground)
36 GND － Ground connections
37 NC － Floating (Don’t connected to ground)
38 NC － Floating (Don’t connected to ground)
39 WL_RST I WiFi reset pin, internal pull high. Low: reset enable, High:
reset disable
40 Dev_Wake_Host O WiFi wake up host, rising edge trigger for host, high level
trigger for MCU.
41 NC － Floating (Don’t connected to ground)
42 NC － Floating (Don’t connected to ground)
43 NC － Floating (Don’t connected to ground)
44 NC － Floating (Don’t connected to ground)
