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TCA9544A: voltage select

Part Number: TCA9544A

Hi Sirs,

We have one questions on TCA9544A

If our Vdpum=3.3V, Vcc=1.8V, and Vdpu0~3 = 1.8V. Is OK?

  • Hello Shu-Cheng,

    Yes, this connection is OK. Note that the VIH and VIL levels for the master port (SDA/SCL) are referenced to VCC, though, so you may want to check that your 3.3-V master device is capable of generating compatible signal levels (particularly a low level that is less than 0.3*VCC).