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BQ28Z610-R1: i2c pin tolerance of input current

Marek Roszko
Intellectual 360 points
Part Number: BQ28Z610-R1

How much current can the BQ28Z610-R1 tolerate in the event of a over-voltage on the two I2C pins?

The BQ28Z610-R1 is in a 1S battery.

i.e. I have a scenario where the pins may see 6.8V but that voltage can be current limit by series R.

Part of the question is really, what is the internal construction of the I2C pins? Are they internally clamping OVs to a power rail (the cell)?

  • 0
    TI__Mastermind 19501 points

    Hello Marek, 

    Please refer to section 7.1 Absolute Maximum Ratings from the BQ28Z610 Datasheet for the maximum ratings of the pins. 

    Additionally, I believe this E2E thread discussed the internal pin construction for the I2C pins. 

    Regards, 

    Jonny. 

  • 0 in reply to Robert
    Intellectual 360 points

    Yea I see the 6V maximum rating, but there is no detailing on the construction of the i2c pins. That e2e thread is poorly named as it just questioned an erroneous 3.3K resistor mention in the datasheet.

    My question is along the lines of, where is the 6V maximum rating coming from? Is it from some sort of internal clamping diode? Because often we can cheat the voltage ratings in those scenarios by simply limiting the current going into the pin.

  • 0 in reply to Marek Roszko
    TI__Mastermind 19501 points

    Hello Marek, 

    Please do not exceed the maximum pin voltages listed in the datasheet. If the voltage seen at the pin exceeds what is listed in the datasheet, then the device can get damaged and you may have unexpected behavior of the device. 

    Regards, 

    Jonny.