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BQ78350: SMB data transfer

Jeffrey Wright
Expert 2875 points
Part Number: BQ78350

Hello;

Will you please confirm my understanding of the I2C sequence when reading from the 78350. For example, when reading voltage 0x09, I should send a Write transaction with the 0x09 command to the device address, and expect the value returned after the repeated start switches to a Read. But Appnote SLUA475  Figures 1 and 2 illustrate SMBus Transaction Examples, but they all show the R/W bit unchanged after the repeated start?????? Am I confused? (yes ;-D)

Thanks. 

  • 0
    TI__Guru* 81034 points

    Hi Jeffrey,

    That's correct, you should send a Write transaction to start any SMBus command.

    For sending the read command 0x09, you first write the device address (0x16) and then the command (0x09), then the repeated start.

    After the repeated start, you send the address again with the RW bit set to 1 (0x17). This is shown in the 3rd byte of Figure 1 in SLUA475.

    Best regards,

    Matt