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TCA9800: VCCB（2.5V）side is always there, VCCA（1.8V）power on/off again and again of TCA9800

Frank Xiao
Genius 12055 points

Part Number: TCA9800

Hi team,

My customer is using the TCA9800 now, the schematic is below. If VCCB（2.5V）side is  always there, VCCA（1.8V）power on/off again and again. Whether it will influence the TCA9800 or damage the TCA9800? Thanks.

  • 0
    TI__Guru* 81641 points

    Hey Frank,

    "If VCCB（2.5V）side is  always there, VCCA（1.8V）power on/off again and again. Whether it will influence the TCA9800 or damage the TCA9800? Thanks."

    This shouldn't be a problem. Our device will go into RESET mode and be HI-Z when VccA is not present. As long as there is no ringing/ when you power up/down the Vcc rail causing the voltage to go beyond the allowed absolute max/min for our device, we shouldn't see any issues.

    -Thanks,

    -Bobby