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LM97937: use lm97937, The ADC test pattern function is ok; but in Normal Mode(bit bust&SNRBOOT), The data collected by ADC is always 255 or -32514.

Part Number: LM97937

Dears;

        use lm97937; The ADC test pattern function is ok,Data can be read normally; but  in Normal Mode(bit bust&SNRBOOT), The data collected by ADC is always 255 or -32514.

Could you give me some advice? Thanks!

    Register configuration information & schematic diagram is as follows: