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TPD2S300: I2C OVP protection

Austin Allen
Intellectual 2555 points
Part Number: TPD2S300

Tool/software:

Hey all,

Is there any reason why TPD2S300 wouldn't be able to be used for I2C OVP protection?

Best,

Austin Allen

  • 0
    TI__Genius 12705 points

    Hi Austin,

    I am checking on this. My concern is the dead battery Rd resistors when TPD2S300 is not powered, but may not affect I2C depending on timing of power on. 

    Best,

    Alex

  • 0 in reply to Alex Liu
    TI__Genius 12705 points

    Hi Austin, 

    So no concerns other than Rd resistor when the TPD device is unpowered. When using TPD2S300 for I2C protection, please make sure the TPD device remains powered at all times, and in dead battery make sure the TPD device powers on with the I2C pull-up rail.

    Best,

    Alex

  • 0 in reply to Alex Liu
    TI__Intellectual 2555 points

    Hi Alex,

    So what is the concern around the Rd resistors? Do you think there are any better parts for I2C OVP protection?

    Best,

    Austin Allen

  • 0 in reply to Austin Allen
    TI__Genius 12705 points

    Hi Austin,

    The TPD2S300 device will present Rd on the CC pins (or I2C in this case) when unpowered from VPwr. This is is a pull-down resistor and will interfere with the I2C voltage. You would need to avoid having the TPD2S300 unpowered when I2C communication is occuring, to avoid pulling down the I2C pins. This is why I recommended powering TPD2S300 off of the same rail as I2C pull-up is using.

    Typically, we don't put any OVP on the I2C pins in our reference designs, since these won't be exposed to high voltage VBUS like pins on the Type-C connector.

    Best,

    Alex