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Original question:

BQ21061: I2C reset

BQ21061: I2C communication in active battery mode

Szhau Lai
Prodigy 50 points
Part Number: BQ21061

Hi 

I have problem to use i2c communication in active battery mode. I am pretty sure the LP pin is high. 

At the moment, I can only access the I2C by for MR low. I don't have oscilloscope or possibility to access the I2C pin. Is there any way to find where the problem is?

Here is my connection schematic.

Thanks for help! 

  • 0
    TI__Genius 10155 points

    Hi,

    It may help to confirm what state you are in when you're unable to communicate via I2C to try to find the root cause of the issue. I have a few questions that may provide useful context:

    - Can you try I2C communication when Adaptor is connected?

    - When you are unable to communicate via I2C can you please provide VDD voltage.

    Szhau Lai said:
    I can only access the I2C by for MR low

    - Do you mean you can only communicate when the /MR is held low?

    - How long are you holding /MR low? Can you communicate still after it has been released?

    - What is your battery and input voltages when you can and can't communicate with the device?

    - Looking at your schematic, can you clarify what the /CD pin is connected to?

    Best Regards,

    Juan Ospina

  • 0
    Prodigy 50 points

    Problem solved, it was my MCU configuration problem.