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RM57L843: Arm-based microcontrollers forum

VEERAPPAN P
Intellectual 420 points
Part Number: RM57L843

Hi Team,

 I am using RM57L843 microcontroller, now we face new problem in ADC channels. we use 8 channels 7 channels are working fine but only one channel is not working, if I give 0v the digital value read is 2.8V. Is this problem is related to controller failure or any other problem.

  

  • 0
    TI__Guru 70371 points

    Hi Veerappan,

    Can you please provide more details about the issue?

    I mean which of the 8 channels you are using? and exactly with which channel you are facing issue?

    As we have two ADC instances and ADC1 have 32 channels and ADC2 have 25 channels so please provide more details.

    And if possible, share the complete project that would be helpful to easily debug your issue? because i need to see other configurations as well, you can send a private message.

    --

    Thanks & regards,
    Jagadish.

  • 0 in reply to jagadish gundavarapu
    Intellectual 420 points

    Hi jagadish gundavarapu, 

    This is the ADC circuit diagram section, We use ADC1, first 8 channels. In that 8 channels 7th(ADC1IN6) channel is not working, pin no is T19. First four channels are connected through low pass filter and remaining four channels are connected directly to the controller. We also checked varying AD1IN04 channel, varying channel AD1IN04 doesn't affect AD1IN06.

  • 0 in reply to VEERAPPAN P
    TI__Guru 70371 points

    Hi Veerappan,

    Just now i tested with my RM57 launchpad and i don't see any issue in the analog measurement for ADCIN6 channel.

    Highlighted the result after connecting GND to the pin.

    Here is my tested code:

    ADC_TEST_RM57.zip

    --

    Thanks & regards,
    Jagadish.

  • 0 in reply to jagadish gundavarapu
    Intellectual 420 points

    We are also tested using our launchpad it work fine but in our board it doesn't work may be it is controller failure or any other issue like controller solder ball is not properly soldered or any other suggestion to solve this problem.

  • 0 in reply to VEERAPPAN P
    TI__Guru 70371 points

    Hi Veerappan,

    I don't think it is a controller issue,

    Yes, it might be a soldering issue. The pin might be shorted with some other pin or not solder properly to the pad. So please make sure the proper soldering.

    --

    Thanks & regards,
    Jagadish.