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BQ78350-R1A: BQ78350 (Gauge) + bq7692006PW I2C slave address

Karl Dietmann
Prodigy 20 points
Part Number: BQ78350-R1A
Other Parts Discussed in Thread: BQ76920, BQ769200, BQ78350

Hello,

we are using an BQ78350-R2A (gauge-IC) combination with the proposed BQ76920 (AFE-IC).

Due to the current global lead time situation and availability bq7692006 have been ordered. On second thought this "version" of the AFE-IC does not seem to be compatible due to the I2C address being 0x18 instead of 0x08 (expected by BQ78350). Is there an firmware update for the BQ78350 or any other idea to resolve this I2C address problem?

Thank you

  • 0
    TI__Guru* 81034 points

    Hi Karl,

    This question comes up from time to time over the years when users have purchased the wrong part number by mistake. Unfortunately, there is no way for the BQ78350 to communicate with I2C address 0x18 without a firmware change which is not possible (this would require developing a new version of the BQ78350 which will not be done).

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Prodigy 20 points

    Hi Matt,

    thank you for the answer. Is an I2C address translation (LTC4316) possible? www.analog.com/.../4316fa.pdf

    Thank you

    Karl

  • 0 in reply to Karl Dietmann
    TI__Guru* 81034 points

    Hi Karl,

    This looks like it might work, but you would need to test this. I do not have any experience with this type of device. A few things I notice from the datasheet - the supply current is significant so it would pull more current from the battery, there are notes about extra pulses on SDA and extra start and stop signals in some situations. I am not sure if these things would mess up the communication between the devices. 

    Regards,

    Matt