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TMS570LS3137: Configure the ADC

Danilo A.
Mastermind 28560 points
Part Number: TMS570LS3137

Hi Team,

Our customer is using the TMS570LS3137 and would like to know how to configure the ADC connected to pins V8 and V9. Please see attached schematic diagram for reference.

Regards,

Danilo

  • 0
    TI__Guru 69761 points

    Hi Danilo,

    We started working on your issue and will provide an update soon.

    --

    Thanks & regards,
    Jagadish.

  • 0 in reply to jagadish gundavarapu
    TI__Guru 69761 points

    Hi Danilo,

    There must be something wrong while designing that schematic, actually those are not analog pins.

    And here are the list of analog pins available in ZWT package of TMS570LS3137.

    Those pins have a single functionality only. That is,

    V8 will act as a MIBSPI3SOMI[0]

    &

    V9 will act as a MIBSPI3CLK.

    So, you can't do any other functionality on these pins. And also remember that the analog pins will not multiplex with any digital functionality you can see the same thing on my first image.

    --

    Thanks & regards,
    Jagadish.

  • 0 in reply to jagadish gundavarapu
    TI__Mastermind 28560 points

    Hi Jagadish,

    Thank you for your response. Please see the feedback of our customer below.

    We are using AD7476SRTZ-R2 ADC as an interface between adc input and micro controller.
    We are feeding adc input voltage to AD7476SRTZ-R2 and this adc will process based on the inputs chip select , clock received from the micro controller. and processed digital data will be given to the microcontroller.
    so we are trying to send chip select  and clock from the micro controller but adc is not responding. 
    I am attaching the custom board schematic please check.

    Regards,

    Danilo

  • +1 in reply to Danilo A.
    TI__Guru 69761 points

    Hi Danilo,

    Balu Banoth contacted me on private chat yesterday and i clarified his doubts there.

    Actually, he is using external ADC not internal ADC in LS3137 controller, and the communication between the external ADC and our controller is SPI so he should read the ADC value through SPI communication. But he is trying to do with internal ADC.

    I communicated him and provided example project on how to read the ADC value from external ADC through SPI communication.

    https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/908/External_5F00_ADC_5F00_AD7476_5F00_TEST.7z

    I guess we can close this thread.

    --

    Thanks & regards,
    Jagadish.

  • 0 in reply to jagadish gundavarapu
    Prodigy 45 points

    Thanku so much sir for helping me  sir