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TCA9548A: VCC power connection if use separate VDPUM and VDPUx

Ray Chang
Intellectual 1345 points
Part Number: TCA9548A

Hi, Team

If we need to pull-up to Standby power 3.3V for VDPUM and pull-up to Main power 3.3V for VDPU0-7, how to connect VCC power?

Cconnect to Standby power 3.3V or Main power 3.3V?

  • 0
    TI__Guru 72821 points
    Hello Ray,

    This device will be high impedance on all the channels if it is below V(por) so it does not seem like it will matter what Vcc it is connected to. Personally I would choose VDPUM as it is the connected to the main I2C bus which is what is used to communicate with the device after start up.

    Thanks,
    -Bobby