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Setting reference voltages for the i.mx7 ADCs.

Question asked by Dennis Muhlestein on Aug 8, 2018
Latest reply on Aug 9, 2018 by Dennis Muhlestein

I'm looking at directly using the built in ADCs on the i.mx7 in our project.


In the Reference manual for the i.mx7d board it mentions the ADCX_inX pins w/ 2 ADCs and 4 inputs each.  I see in the reference board schematic where these are connected to a header and brought into the CPU except for the one pin connected to the mikrobus.


It also mentions ADC_VREF[H/L] for the voltage high and low reference.  I can't find these inputs in the reference schematic or the data sheet though.  The only pins I see other than the inputs are the 1.8V power supply and pcap inputs.  


So the question is, how does one set the reference voltage for the ADCs?  I want to measure up to 12V for instance.