Wi-Fi&Bluetooth Module Series
FCM561D-P_Hardware_Design
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Table 20: Pin Definition of SAR ADC Interfaces
Table 21: SAR ADC Features
The selection of internal or external reference voltage selection can be configured via registers. It is
recommended to use internal VREF by default.
3.4.14. Touch Sensor Interfaces
In the case of multiplexing, the module supports up to 16 capacitive-sensing touch sensor interfaces,
Pin Name
Pin No.
Multiplexing
Function
I/O
Description
Comment
GPIO25
71
ADC1
AI
General-purpose ADC interface
Channel 1
GPIO24
72
ADC2
AI
General-purpose ADC interface
Channel 2
GPIO23
27
ADC3
AI
General-purpose ADC interface
Channel 3
GPIO28
10
ADC4
AI
General-purpose ADC interface
Channel 4
GPIO22
28
ADC5
AI
General-purpose ADC interface
Channel 5
GPIO21
29
ADC6
AI
General-purpose ADC interface
Channel 6
GPIO44
33
ADC10
AI
General-purpose ADC interface
Channel 7
GPIO45
32
ADC11
AI
General-purpose ADC interface
Channel 8
Parameter
Condition
Min.
Typ.
Max.
Unit
Conversion clock
26
MHz
Conversion time
-
16
Cycle
VREF
Internal
1.2
V
External
1.5
V
Input voltage range
0
VREF × 2
V
Input impedance
10
MΩ
Input capacitance
1
pF
NOTE