• State Resolved
  • +1 person also asked this people also asked this
  • Locked Locked
  • Replies 2 replies
  • Subscribers 31 subscribers
  • Views 147 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSPM0G1107: Test the ADC input circuit using the respective output port

Jose Oliveira
Prodigy 70 points
Part Number: MSPM0G1107

Tool/software:

Hello,

Is it possible to check the picture in attachment and let me know if there is any restriction to perform the following task?

  • Use "uC_TwIn" as ADC input on pin PA25/A02 and, for ~250k cycles, set it as output low (0V) or output high (3.3V) during ~1 second; then set again as analog input;
  • The motivation of this is to test if the plausibility of the analog voltage value that is converted by the ADC on this input;
  • The question is if the output port PA25 can withstand this number of test cycles, because of the inrush current that will be supplied or sinked to/from capacitor C200 with 100nF.
  • Note: Vcc_NTC_TwIn = 3.3V;

Thank you very much.

  • 0
    TI__Genius 15690 points

    Hi Jose,

    I do think you'd end up damaging the device pins with the inrush current over the course of 250k cycles. I am not entirely sure I understand your test here but would it be feasible to utilize the GPIO's pull-up/pull down resistors to reduce the current flow here?

  • 0 in reply to Dylan OBrien
    Prodigy 70 points

    Hello Dylan,

    Thank you for the feedback. Your proposal sounds good. We will try it and will close this issue without further questions.