Touch Sensor Interfaces - Quectel FCM561D-P Hardware Design

Table 20: Pin Definition of SAR ADC Interfaces
Pin Name Pin No.
GPIO25 71
GPIO24 72
GPIO23 27
GPIO28 10
GPIO22 28
GPIO21 29
GPIO44 33
GPIO45 32
Table 21: SAR ADC Features
Parameter
Conversion clock
Conversion time
VREF
Input voltage range
Input impedance
Input capacitance
NOTE
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,
FCM561D-P_Hardware_Design
Multiplexing
I/O
Function
ADC1 AI
ADC2 AI
ADC3 AI
ADC4 AI
ADC5 AI
ADC6 AI
ADC10 AI
ADC11 AI
Condition Min.
-
Internal
External
0
10
Wi-Fi&Bluetooth Module Series
Description
General-purpose ADC interface
General-purpose ADC interface
General-purpose ADC interface
General-purpose ADC interface
General-purpose ADC interface
General-purpose ADC interface
General-purpose ADC interface
General-purpose ADC interface
Typ.
16
1.2
1.5
1
Comment
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel 8
Max. Unit
26 MHz
Cycle
V
V
VREF × 2 V
MΩ
pF
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