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LP8556: Is it possible to apply 1.8V to SCL and SDA when EN/VDDIO=Low?

K.Yaita
Guru 29720 points
Part Number: LP8556

Hi Team,

My customer considers to use LP8556 in his system and has the following question.

Is it possible to apply 1.8V to SCL and SDA through pull-up resistor when EN/VDDIO=Low (0V)?
*According to datasheet, EN/VDDIO is power supply reference for SCL and SDA.

I would like to ask if input current of SCL and SDA could be observed or not in this case. 

Best Regards,
Yaita / Japan disty

  • 0
    TI__Expert 4565 points

    Hi Yaita-san,

    Input leakage of SDA/SCL of LP8556 will be less than 1uA while VDDIO is low when VDDIO is separated from SDA/SCL.

    For normal connection, VDDIO is the pull up power of SDA/SCL, but it can be separated from SDA/SCL as long as it's lower or equal to SDA/SCL pull up level.

    Hope this helps,