Analog to Digital Converter¶

There are 10-bit analog ports available on GSM modules. Input voltage range from 0-2.8v gives digital output of 0-1023.

However analog ports on NBIoT module are 12-but and input voltage range from 0-1.4v with digital output of 0-4095.

4G LTE Module ADC Channel Mapping¶

ADC Channel	EC600U	EC200U	N58	N716	L610
ADC CH 0	Pin 19	Pin 45	Pin 89	Pin 31	Pin 45
ADC CH 1	Pin 20	Pin 44	Pin 88	Pin 30	Pin 44
ADC CH 2	Pin 133	Pin 43	–	–	Pin 43
ADC CH 3	Pin 114	–	–	–	Pin 43

GSM/NB-IoT Module ADC Channel Mapping¶

ADC Channel	MC20U Pin S20U Pin	M56 Pin	MC60 Pin MC20 Pin	M66 Pin	BC20 Pin	SIM868 Pin
ADC CH 0	Pin 6	Pin 61	Pin 6	Pin 9	Pin 6	Pin 38
ADC CH 1	Pin 47	Pin 12	Pin 47	Pin 16	Pin 54	–
ADC CH 2	Pin 66	Pin 3	Pin 28	Pin 28	–	–
ADC CH 3	Pin 30	Pin 2	Pin 29	Pin 29	–	–
ADC CH 4	Pin 29	Pin 13	–	–	–	–
ADC CH 5	–	Pin 33	–	–	–	–

int adc_config(int ch)¶

Configure ADC channel and setup pin-muxing

Return

0 on success, negative error otherwise

Parameters

unsigned int adc_read(int ch)¶

Read ADC Channel

Return

12-bit ADC value, If ADC channel is not configured prior to calling this function, return value is unreliable.

Parameters

Note

Please refer header file for actual number of channels available for respective board.

enum adcch_e¶

ADC channels

Values: