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TXS0108E：The TXS0108E controls the DC-DC enable pin to not be pulled low.

gaoguoqiang
Prodigy 60 points
Part Number: TXS0108E

As shown below, I use The TXS0108E controls the DC-DC WD1039EB enable pin. When GPIO_98 is pulled high, the enable pin is high.

When GPIO_98 is pulled low, PMT_VEN cannot be pulled down completely and the voltage is always 1.2V.

Please help analyze the cause and give advice on how to control the enable pin.

  • 0
    TI__Guru 58990 points

    The PMT VEN signal from the TXS is going into the WD device but has a 10K pulldown to gnd ( and 10k pullup with 0.1uF cap?).

    The TXS internally has pullup resistors. So, would recommend to remove the external pulldown and pullup resistors. Having the 0.1uF cap is not advised either.

    The TXS cannot drive such large cap loads.