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TCA6507: SDA & SCL 5V tolerant?

Frans Jan van Donselaar
Prodigy 20 points
Part Number: TCA6507

Hi,

The product page states that the I/O is 5V Tolerant. But the recommended max voltage on SDA and SCL is 3.6V according to the datasheet. So I am a bit confused here.

Will it be OK to use a 3.3V supply and pull up the SDA and SCL lines to 5V?

Thanks and best Regards,

Frans Jan

  • 0
    TI__Intellectual 840 points
    Hi Frans,



    The 5V tolerant spec is specifically for outputs only, in this case the LED pins (pins P0-P6) NOT the SDA/SCL lines. The absolute max for Vcc is 4.6V and the optimal voltage for Vcc and SDA/SCL is 1.65V - 3.6V. The SDA and SCL lines should be connected to Vcc through a pull up resistor.

    Why are you wanting to pull the SDA/ SCL lines to 5V?

    Are you wanting to pull the SDA/SCL lines to 5V to interface with a 5V micro controller? If so you might want to use a buffer or level shifter.



    Regards
    Daniel Noel
  • 0 in reply to Daniel R Noel
    Prodigy 20 points
    Hi Daniel,

    I wanted to connect the TCA6507 to a 5V I2C bus. But now I will use a level shifter.

    Thanks!
    Frans Jan