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Original question:

ADS7038: Channel switch delay and ADC count measurement issue with some particular channels

ADS7038: ADS7038 simultaneous configuration on two channels configured differently, one as analogue input and the other as GPIO output

Youness Mandour
Prodigy 20 points
Part Number: ADS7038


Tool/software:

Hello,

I was wondering if it is possible to use simultaneously two channels of the ADC, one as an analog input and the other one as a GPIO output ?

The purpose would be to use the GPIO output to control and external MUX, this external mux will forward a signal to the Analog input of the ADC.

Since both are internaly connected to the internal MUX, wouldn't that be impossible ? or since one channel is configured as a GPIO output, it becomes unrelated to the internal MUX and would keep its state when using the mux to read an anolg input.

Thank you in advance !

  • 0
    TI__Genius 17190 points

    Hi Youness,

    Thanks for waiting for a response due to the U.S. Christmas holidays. Yes, you can select to use two different channels, one as a GPIO output, and the other as an analog input. 

    The status of the GPIO output is retained in the GPO_VALUE register, so a pin will remain high until it is programmed to go low again. It stays persistent whether or not you are reading from an analog input channel. So yes, for all intents and purposes, the GPIO pins become disconnected from the analog inputs, with different control logic blocks. 

    Regards,
    Joel