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MSP432P401R: Connecting 12 ADS8688's to MSP432 with SPI

Spencer Zanardi
Prodigy 110 points
Part Number: MSP432P401R
Other Parts Discussed in Thread: ADS8688

Hi,

I have this battery system that is wired as 8 parallel columns of 6 series batteries (48 total). With each battery roughly 1.5 V each, each column has 9 V at the top. I am looking to measure the voltages of the batteries, with 2 data points for each battery, so 96 data points total. Now I chose the ADS8688 because my experiments in the past has caused battery polarity reversal to the batteries, which would cause the need for my ADC to have bipolar inputs. I have some questions for you if you can help me with attempting to connect these ADC's to an MSP432 so I can store my data:

1. First, is it possible to connect 12 of these ADC's with SPI? Or do I need to find an ADC with more inputs so I can limit the number of ADC's I need.

2. Now the MSP432 does not take negative inputs. I plan on using this op amp circuit attached to the end of the ADC to adjust the values so everything is positive. Do you know what pin I need to connect the circuit out of? Aka I am unclear what the output pin is.

Please let me know if anything is unclear or if you have any questions for me. Thank you in advance for your help

  • 0
    TI__Guru 66381 points

    Hello,

    (1) The connection with SPI could be realized a couple of ways but the idea is that you would use dedicated chip selects for each ADC and share the clock and data lines.  The MSP has 8 eUSCI peripherals so you could use all 6 to connect; 2 ADCs per eUSCI.

    (2) What negative input is the MSP432 taking?  Are the SPI voltages negative?  Can you clarify this second question?

    Regards,
    Chris

  • 0 in reply to Chris Sterzik
    TI__Guru 66381 points

    Hello,

        If you have additional questions, then please use the 'Ask a related question' button.

    Regards,
    Chris

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