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bq27541 讀取問題 ?

各位先進 :

           Bq27541想要利用MCU讀取電壓 , 想請問一下 HDQ 讀取電壓的Command byte命令是不是要寫在下圖address的地方 ???

          不知為何 我讀出的都是0XFF ???

          文件上是寫7個bit + 1個R/W bit 共8bit  , 但Command 命令已經是8bit了 ,多的R/W bit要如何寫 ???