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LM5066: Negative local temperature reading issue !

Part Number: LM5066

NPN transistor MMBT3904LT1G collector and base connected to diode pin of lm5066. Emitter is grounded. Board placed in thermal chamber at -20degC. While reading local temperature register 0x8Dh, we received data as 0xF0Ah . How to convert the data to negative temp. At room temp +25 , data was received properly from LM5066 as 0x190h.