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BQ24296M: How to reduce I2C leakage current in standby mode

Jesse Ryan
Prodigy 20 points
Part Number: BQ24296M
Other Parts Discussed in Thread: BQ24296, , BQ25895

The designed circuit is as below. When master device has been remove , I measured leakage current go into BQ24296 through SDA and SCL, and it's about 51uA. I try to increase the pull-up resistors from 10K to 50K,

but it makes no sense to reducing leakage current. Is there any method to reduce leakage current drawing by I2C circuit?

  • 0
    TI__Mastermind 25800 points
    Hey Jesse,

    How did you verify this was leakage current going into the charger?

    Also, you schematic says the bq25895 but your post says the charger in question is the bq24296M. Could you clarify this?


    Regards,
    Joel H
  • 0 in reply to Joel Hernandez II
    Prodigy 20 points

    Hello,

    Sorry，the first version we used bq24296m, but later changed to bq25895. the test was tested base on the former one.

    After I do more test, I found the leakage current is below 5uA.  Previous result was test on condition that I2C between bq24296m and MCU keeped connecting while MCU was power down. So leakage current mainly flowing into MCU cause zero voltage.

    Could you please help to figure out exactly how much the leakage current of the I2C bus is in TI chargers? I want to check out if my test result is correct or not.

    Thank you!         

  • 0 in reply to Jesse Ryan
    TI__Mastermind 25800 points

    Hey Jesse,

    Based on both the bq25895 and bq24296M datasheet Electrical Characteristics, we typically do not expect more than 1uA iof leakage current into SDA and SCL. 

    When you say the leakage current was mainly flowing into the MCU causing zero voltage, are you suggesting that the off state of your MCU is to drive the I2C lines low?

    Regards,

    Joel H