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BQ34110EVM-796: BQ34110EVM doesn't communicate to EV2400 via I2C

Sal LaRussa
Genius 9970 points
Part Number: BQ34110EVM-796
Other Parts Discussed in Thread: EV2400, BQSTUDIO

Hi Guys,

We're having trouble talking to the BQ34110EVM with the EV2400.   I see both the EV2400 and the EVM have pull ups on their I2C lines.   Is it possible our issue is related to the pull up resistors on the I2C lines?  I know some of our other EVM's have jumpers on the pull ups so you can choose to leave the pull ups in place or not use them.   The 34110EVM doesn't allow for easy removal of the resistors.

Are there any obvious things to try or look for when the 34110 and EV2400 don't communicate?

Thanks for your suggestions.

-Sal.

  • 0
    TI__Expert 5090 points
    Hi Sal,

    Have you checked the I2C signals on a scope, to make sure they look ok?

    Using bqStudio, you can use the Advanced Comm I2C tab and try a single transaction. If the device is in firmware mode, it should respond to I2C address 0xAA, vs if it is in ROM mode it should respond to address 0x16. You can simply try a read from register 0x00 and see if you get anything back.

    Thanks,

    Terry