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TCA9539: tca9539

frederic aberlenc
Prodigy 10 points

Part Number: TCA9539

Tool/software:

My SDA and SCL line have a 3.3 volts level and my TCA9539 is powered by 1.8 volts. It works but I dont know if there is a risk od damage. The datasheet is not clear if it is aceptable or not. Can you help me? Thanks

  • 0
    TI__Guru 53301 points

    Hey Frederic,

    This implementation is fine. The voltage applied to the SDA/SCL pins can be higher than VCC as long as it is below the recommended operating conditions of 5V.

    Regards,

    Jack 

  • 0 in reply to Jack Guan
    Prodigy 10 points

    Thanks Jack. Is it possible to have a document to confirm. I really need it. Datasheet does not specify this point. Thanks

  • 0 in reply to frederic aberlenc
    TI__Guru 60038 points

    Frederic, 

    The recommended operating conditions in the datasheet are below: 

    It is recommended to have SDA/SCL only up to VCC. However, note (1) states that if SDA/SCL are above supply, an increase in ICC will result. Although an increase in ICC results, I do not suspect damage to the device unless the voltage on SDA/SCL exceeds that of the absolute maximum conditions. 

    The device was also not validated with a voltage on SDA/SCL that is above VCC. Device operation and the electrical characteristics have not been guaranteed by the datasheet in this way, although this implementation will probably work. 

    Regards,

    Tyler