Embest SBC6300x, Hardware Manual

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3.1.22 BUZZER (BUZZ)
ADC (J19) The system includes a buzzer, it can be controlled by GPIO:
PE19 (low active)
3.1.23 ADC (J19)

8
channel 12bit ADC input

+5V Reference Voltage

This function is extended by ADS7844

Resources from MCU:
ADC
PA0,1,2
PA3 SPI0_NPCS1
PA21 AD_BUSY
Definition of the connector J19(2 x 10pin headers 2.54mm):
GND 1 2 GND
CH0 3 4 CH1
CH2 5 6 CH3
CH4 7 8 CH5
CH6 9 10 CH7
GND 11 12 GND
CH0_0 13 14 CH1_1
CH2_2 15 16 CH3_3
CH4_4 17 18 CH5_5
CH6_6 19 20 CH7_7
CH0-7 can be connected to your signal directly when the voltage is
5V
If your signal voltage is above +5V, you need to provide an appropriate
resistance according your project. Then you can measure your signal on
the channel CH0_0-CH7_7.