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#25890

p karunakar
Prodigy 150 points
Other Parts Discussed in Thread: BQ25890

Hello,

Can you please answer following queries.

If I want to interface bq25890evm with microcontroller via I2c interface then how to bias all circuits (Bq25890). Assume there is no charge input to Bq25890.

  • 0
    TI__Expert 8230 points

    Hello,

    To establish I2C comms on the bq25890 with no VBUS input, you need the following:

    • VBAT >= VBAT(UVLOZ), minimum 2.3V.
    • The bq25890evm has pull-up resistors on board, R5 and R6. Jumper JP4 can be connected to the battery terminal so the pull-ups are biased off VBAT or the pull-up voltage can be provided externally as long as it meets the following thresholds.

    You should be able to establish I2C comms after this with your microcontroller. Please refer to the bq25890 datasheet section 9.2.16 for the I2C communication details.