Service Guide

Wi-Fi&Bluetooth Module Series
FC908A_Hardware_Design 20 / 49
The module supports external crystal or built-in crystal, so XTAL_IN and XTAL_OUT pins are optional
pins.
3.4. Power Supply
3.4.1. Power Supply Pins Introduction
The following table shows the power supply pins and ground pins of FC908A.
Table 5: Definition of Power Supply and GND Pins
3
JTAG mode can be configured by configuring GPIO1/GPIO2. If you need, please contact the QUECTEL team.
Other Interfaces
Pin Name
Pin No.
I/O
Description
Comment
WLAN_SLP_CLK
24
DI
External 32.768 kHz low
power clock input
XTAL_IN
10
DI
Crystal input
Optional.
XTAL_OUT
11
DO
Crystal output
GPIO1
3
40
DIO
General-purpose
input/output
If unused, keep them open.
GPIO2
39
DIO
General-purpose
input/output
RESERVED
Pin Name
Pin No.
Comment
RESERVED
4, 5, 8, 29, 30,32, 35, 37, 38
Keep them open.
Pin Name
Pin No.
Description
Min.
Typ.
Max.
Unit
VBAT
9
Power supply for the module
3.0
3.6
4.8
V
VDDIO
22
Power supply for module’s
I/O pins
1.71
1.8/3.3
3.63
V
NOTE