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3.7.2. XTAL_IN/OUT
The XTAL_IN and XTAL_OUT pins are external crystal pins, and the recommended crystal frequency is
26 MHz. These pins are optional pins, and the crystal position has been reserved inside the module, and
customers can choose according to their needs.
The following table is the recommended crystal parameters. It is recommended that customers select the
crystal according to the following table:
Table 19: XO parameter definition
Parameter
Frequency
load capacitance
ESR
Drive level
Frequency tolerance Initial
+ over temperature
3.7.3. GPIOs
GPIO1/GPIO2 are function configuration pins, which can be used to enter JTAG mode. Please contact
QUECTEL if necessary.
Table 20: Pin Definition of GPIO1/GPIO2
Pin Name
Pin No.
GPIO1
40
GPIO2
39
3.8. RF Antenna Interfaces
ANT_WIFI0/BT is the RF antenna pin, and the RF port requires 50 Ω characteristic impedance.
FC908A_Hardware_Design
Min
Typ.
-
26
-
12
-
60
200
-
-20
-
I/O
Description
DIO
General-purpose input/output
DIO
General-purpose input/output
Wi-Fi&Bluetooth Module Series
Max
Unit
-
MHz
-
pF
Ω
-
μW
-
20
ppm
Comment
VDDIO power domain.
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