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ADS8556: ADS8556 has no busy signal output

Part Number: ADS8556

Hello,TI engineers, about ads8556  AD acquisition chip. occasionally,after I send convst signal ,but there is no busy signal output. The communication interface adopts the parallel 16 bit mode. At this time, the values of the six channels collected will not change any more. Then, I hardware reset the ad chip, but it still cannot be restored. Only when the board

are restarted, it can be restored to normal.

look forward to your answers. Thank you very much.