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MSP432E401Y: ADC value higher than expected.

Daniel Nanto
Intellectual 290 points
Part Number: MSP432E401Y

I am using pin 12 (PE3) of an MSP432E401Y to measure the output voltage of a REF2033QDDCRQ1 device. The read value is consistently ~2.020 V. The value should read ~1.65 V (I've confirmed with an oscilloscope). Why might the value be off by that margin? 

  • 0
    TI__Guru**** 191846 points

    Hi,

      Can you repeat the same issue on another board? I suppose you are using your custom board. Is that correct?

      Can you repeat the same issue on a LaunchPad? What do you measure on a LaunchPad?

      There is an errata ADC#13 that is related to PE3 but it should not affect the PE3 if it is configured as a AIN0. The problem is more related to a glitch on PE3 when used as a GPIO input that is coupled by other ADC channels during sampling. See below. Can you follow the workaround in ADC#14 to disregard the first two samples of AIN0 after the ADC clock is enabled. Do the subsequent ADC measurements generate reasonable values or they are still off?

      

  • 0 in reply to Charles Tsai
    TI__Guru**** 191846 points

    Hi,

      I have not heard back from you. Not sure if you are able to resolve the issue. I will close the thread for now. If you have any update you can write back to the post and the post will change the status to OPEN again.