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INA220B使用問題

Other Parts Discussed in Thread: INA220

我想請問  ina220b calibration register 05h range 是多少?

我輸入  0x7F FF 可正常變為 0x7F FE

但是我輸入 0x80 01 卻會變為 0x80 FF

似乎只要超過8000我的low byte就會變成FF,請問是何原因?