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TCA9548A: Device OFF while I2C pulled HIGH

Alin Paun
Prodigy 175 points
Part Number: TCA9548A

Given the typical application diagram bellow from the TCA9548A:

Would the following scenario:

  • V_DPUM = 3.3V
  • VCC = OFF (HI-Z)
  • V_DPU0 to V_DPU7 = OFF (HI-Z)

cause any sort of problem or lead to a latch-up event?

Would having a 3.3V Logic HIGH on the SDA/SCL/RESET pins (via external pull-ups) cause any sort of problem or phantom powering of the device while it is being powered off? 

  • 0
    TI__Guru 59980 points

    Hey Alin,

    Our device is powered off high impedance when there is no Vcc and also 5V tolerant.

    This device will not back bias through any internal circuitry and power the device up while there is no power on Vcc through SDA/SCL/RESET.

    The set up you described should be fine.

    Thanks,

    -Bobby