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bq78PL116 status register SMBus and random NACK on address.

Bruce Appleton
Prodigy 140 points
Other Parts Discussed in Thread: BQ78PL116

Hello,

I'm having an issue polling data from a bq78PL116. I'm checking the status via command 0x80, and only requesting data after the response is 0x0000.

The application works fine, I poll data every second or so......for a minute or two, then i get a NACK from the BMS on the address 0x16.

The resultant data from issuing command 0x80 is also not matching anything in Table 2 of SLUA591.

Are there any things i must address such as timing, permeable bytes.....any tips would help.

Im using a beagle I2C sniffer.

Thanks in advance.

BRuce

  • 0
    Prodigy 140 points

    The response to command 0x80 is 0x0BB6?

    The link is more stable if i reduce the overall polling frequency to 1Hz. I lowered clock rate from100kHz to 50KHz (just in case it was related to this.)

    It seems like reducing the polling frequency has helped a lot, but i still don't understand the response from 0x80 Read.

    Regards,

    Bruce

  • 0 in reply to Bruce Appleton
    Prodigy 140 points

    Its something to do with the BMS being busy because it lasts about 2 seconds where it will not acknowledge the address 0x16.

    I am charging the back.....so I am wondering if it is occurring at simulation points......