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LM75A: some questions on LM75A

Part Number: LM75A

Hi Sirs,

Sorry to bother you,

Question as below

1. After the Thermal Sensor reads the value, do we need to add Offset? Because the value currently read is a little low. We could ignore the 9th bit change from 1 to negative value.

2. Why sometimes read as a negative value? Because I am operating at room temperature. 2180=001000011000000 (the 9th bit is 1)