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ADS131E08: ADS131E08 CS pin

CS kk
Intellectual 400 points
Part Number: ADS131E08

DSP connectedwith ADS131E08 by SPI,  DSP can not  communicate with ADS131E08 as the CS pin connect to GND by 4.7K resistance, but when use a DSP IO to control the ADC, it's OK. Why?

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    TI__Guru**** 180821 points
    Hi Sam,

    Welcome to our e2e forum! Can you provide a bit more detail and perhaps a scope shot of the control lines? Which DSP are you using? How often is /CS toggling when not using a GPIO function? Most people use a pull-up on /CS if it's being actively controlled, why did you opt to use a pull down?