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3.7. Other Interfaces
3.7.1. WLAN_SLP_CLK
The 32.768 kHz sleep clock is used in low power modes, such as IEEE power saving mode and sleep
mode. It serves as a timer to determine when to wake up the FC905A to receive signals in various power
saving schemes, and to maintain basic logic operations when the module is in sleep mode.
Table 15: Pin Definition of WLAN_SLP_CLK Interface
Pin Name
WLAN_SLP_CLK
The following are the recommended selection parameters for the recommended 32.768 kHz crystal:
Table 16: WLAN_SLP_CLK Parameter Recommendation
Parameter
Frequency
Frequency accuracy
Duty cycle
Input signal amplitude
Signal type
Input impedance
Crystal load capacitance
Clock jitter
FC905A_Hardware_Design
Pin No.
I/O
24
DI
Value
32.768
± 200
–
30
70
–
200
3300
Square wave or sine wave
> 100
< 5
< 10000
Wi-Fi&Bluetooth Module Series
Description
External 32.768 kHz low power clock input.
Unit
kHz
ppm
%
mV, p-p
-
kΩ
pF
ppm
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