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ADS8332: ADS8332 Interfaced with TM4C123

Part Number: ADS8332

Hi,

I have interfaced ADS8332 with TM4C123 on SSI2. 

Configured clock at 20MHz.

Writing to configuration register CMR + CFR = 0xE7BD. (proded on oscilloscope)

But reading back CFR with 0xC000 I am not getting back 0x7BD.

Please let me know where I am going wrong, attached Is my code and schematics.

Thanks and Regards,

DileepADS8332.c

  • Hello Dileep,

    Can you confirm that the REF- pin is connected to AGND? If not connected to ground, this could cause unpredictable behavior. Also, please provide waveform scope capture of /CS, SCLK, SDI, SDO, /CONVST for the CFR read and write operation.

    Thank you,
    Keith N.
    Precision Data Converters
  • In reply to Keith Nicholas:

    Hi Keith,

    Yes REF- pin is connected to AGND. I have captured waveforms as attached.

    Regards,

    Dileep

  • In reply to Dileep D R:

    Hi Dileep,

    The ADS8332 reads data on SDI pin on the falling edge of the clock. It requires an 8nS setup and hold time between SDI and the falling edge of clock. It looks like you are clocking on the rising edge.

    Please adjust timing to see if this corrects the issue.

    Thanks,
    Keith N.
    Precision ADC converters

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