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ADS1232: Fast Init fault, not with zero, replace for CS5530

Comet Yes
Intellectual 620 points
Part Number: ADS1232

HI Guys，

When we use ADS1232, we found ADS1232 not be init correctly... the issue is when we power down the device then Power on immediately（It will take about 2 seconds total），It seems ASD1232 was not be init clear correctly, but when we power down the device for a little while(as >10s is enough), the ADS1232 can be init correctly

we use ADS1232 replace CS5530, and face this issue, may need your professional answer can help. What is it will affect? TKS ~

figure 1, when power on we InitAD.

  • 0 in reply to Comet Yes
    TI__Guru** 113765 points

    Hi Comet

    Most likely the issue you are seeing is related to an improper POR on device startup or restart.  Make sure the PDWN pin is low at startup.  Adding a pulldown resistor (47k ohm) will help accomplish this until the micro is started and can set the PDWN control to a low state.  After both the analog and digital supplies have settled to the nominal value, bring PDWN pin high.  After about 100ms, pulse the PDWN pin with 100us low time.  This should allow the ADS1232 to restart properly for every power up cycle.  We hope to have this information in the datasheet in the not too distant future.

    Best regards,

    Bob B 

  • 0 in reply to Bob Benjamin
    Intellectual 620 points

    Hi  Bob,

    Tks, so we should keep PDWN with low stat in power-up, then turn high for a 100ms late?you have give a long time. I think the PIC in the datasheet is also good but not the best, isn`t it?

  • 0 in reply to Comet Yes
    TI__Guru** 113765 points

    Hi Comet,

    Some of those pictures need to be updated as was mentioned in my earlier post.  The initial delay is the minimum requirement from a 'cold' start that has had a long off time.  If the power should brownout, the POR may not take place properly which will require the PDWN pulse.  I gave the 100ms start delay based on testing.  You may not need to wait that long, but the PDWN pin should be pulsed high-low-high for proper startup in every case.

    Best regards,

    Bob B