TS-4100 ADC

This board supports two 12-bit ADC inputs using the i.MX6UL CPU's integrated ADC. All of these inputs can sample 0-3.3 VDC intrinsically or 4-20 mA with the necessary hardware in place.

Note:

An external resistor will need to be added in order to enable the 4-20 mA measurements.

These ADCs are accessed through the Linux Industrial I/O Subsystem (IIO), which provides sample rates up to 6ksps across all inputs. The simplest API it offers for slow speed acquisition is via sysfs (/sys):

cat /sys/bus/iio/devices/iio:device0/in_voltage{1,9}_raw

The pin assignments and names for accessing each ADC input are:

Schematic Name	i.MX6UL ADC Signal	CN2 Terminal Pin	IIO name
GPIO_1_ADC	ADC1_IN1	12	voltage1
GPIO_9_ADC	ADC1_IN9	91	voltage9

Note:

Each baseboards breakout implementation of these two ADC pins will differ.