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ADS5401: What kind of situation will cause the VREF and VCM equal to 0V?

Part Number: ADS5401

Hi Sir,

recently, we found the VREF and VCM of ADS5401 equal to 0V when we power on it.

we'd like to know the section8.3, what will impact to voltage reference block? as my understanding, the reference voltage is a power circuit to output two voltage rails as reference.

Can we know the detail about that?

Thanks.