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TMP1075: TMP1075 Configuration register abnormal reading and writting

Part Number: TMP1075

Hello,

My customer is using TMP1075. They can read the temperature data correctly, however, when they ready configuration register and data comes up as 00H which is supposed to 00FFH.

Meanwhile, they try to write the register with different configuration, the data come out also as 00H.  

Could anyone suggest the possible cause?

B.R

Paul