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BQ78350-R1A: SBS Command

KIM
Intellectual 550 points
Part Number: BQ78350-R1A

Hi,

I have captured the SMBus data from BQ78350-R1A. I am not sure how to interpret the data.

I got the following data from different SBS command.

- 0x02 00 19 for relative SOC (0x0D)

- 0x00 00 51 for Current (0x0A)

- 0xAD 7B FC for Voltage (0x09)

how to convert the hex data to the SOC, current and voltage respectively?

Thanks!

  • 0
    TI__Mastermind 42060 points

    Hello Kim,

    The first two bytes are the data you want to measure(in little endian), the third byte is the CRC checksum calculated.

    So to interpret your HEX data:

    SOC:

    • Data = 0002; CRC = 19
    • Data (decimal) = 2

    Current:

    • Data = 0000; CRC = 51
    • Data (decimal) = 0

    Voltage:

    • Data = 7BAD; CRC = FC
    • Data (decimal) = 31661

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    Intellectual 550 points

    Hi,

    Any idea why the address is 0x0B?

    I thought the SMBus address is 0x17 (as in the bq studio).

    Can help to advise?

    Thanks!

  • 0 in reply to KIM
    TI__Mastermind 42060 points

    Hello Kim,

    The device address is usually referred to being 8-bit long, but it is actually 7 bits. So the address as 7 bits, is 0x0B (1011), if you bit shift to the left to make it into 8-bit format, it would become 0x16(10110). This is the initial address for the device, after a repeated start the address becomes 0x17.

    I would recommend you read Section 1 of the SMBus Made Simple application report. It goes into more detail on the topic there.

    Best Regards,

    Luis Hernandez Salomon