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	EG915U
ADC CH 0	Pin 19	Pin 45	Pin 89	Pin 31	Pin 45	Pin 24
ADC CH 1	Pin 20	Pin 44	Pin 88	Pin 30	Pin 44	Pin 2
ADC CH 2	Pin 133	Pin 43	–	–	Pin 43	–
ADC CH 3	Pin 114	–	–	–	–	–

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	–	–	–	–

#include <hw/adc.h>

int adc_config(int ch)¶

Configure ADC channel and setup pin-muxing

unsigned int adc_read(int ch)¶

Read ADC Channel

Note

8910 has 12-bit ADC, whereas MT6261 has 10-bit ADC resolution

Parameters: ch – [in] ADC Channel to read adcch_e
Returns: ADC raw value, If ADC channel is not configured prior to calling this function, return value is unreliable.

unsigned int adc_read_mv(int ch)¶

Read adc channel value in mV.

Parameters: ch – [in] ADC Channel to read adcch_e
Returns: ADC value in millivolts, If ADC channel is not configured prior to calling this function, return value is unreliable.

Note

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

#include <plat/def_adc.h>

enum adcch_e¶

ADC channels

Values: