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UCD90160A: Chip input power pin at Power-On process , GPIO pin arise electric leakage condition

peng wei
Prodigy 130 points
Part Number: UCD90160A
Other Parts Discussed in Thread: UCD90160

Hi team:

we measured UCD90160A input power and output GPIO(for DCDC BUCK enable), detect CH2 GPIO voltage 780mV,  is similar with CH1 VCC3V3 voltage value;

GPIO electric leakage will lead to mainboard DCDC chip enable ,  voltage output rise edge have "the stage";

datasheet can't find with V33A/V33D the logic relationship between GPIO, please help to solution, Thanks!

CH1: UCD9016_3V3(Pin 7 44~46)

CH2: VEN_CPLD_VDD1P8(Pin 14 GPIO4)

CH3: PSU_PWR_OK

UCD90160 Datasheet:

  • 0
    TI__Guru 66240 points

    Hello

    What is the pin for the PSU_POWER_OK? You may try to increase the slew rate of the V33D. 

    Regards

    Yihe

  • 0 in reply to yihe
    Prodigy 130 points

    Hi yihe:

    What is the pin for the PSU_POWER_OK? 

    -->Is 48V to 12V power supply module power good signal(PSU output)，i think don't focus on;

    You may try to increase the slew rate of the V33D.

    -->so, GPIO pin arise electric leakage condition when slew rate of the V33D too low？

         exp. V33D voltage value only 780mV, chip not working, chip[ GPIO pin will keep unkown state？

  • 0 in reply to peng wei
    TI__Guru 66240 points

    HI 

    Why was the V33D has a very slow ramp up at the very beginning and then suddenly rise? This is not a typical power ramp up.

    Have you tried? 

    Regards

    Yihe

     

  • 0 in reply to yihe
    Prodigy 130 points

    Hi yihe:

    Why was the V33D has a very slow ramp up at the very beginning and then suddenly rise? This is not a typical power ramp up.

    --> PSU address pin has internal 3.3V pull-up ，this voltage will pass by PWR board pull-up resister electric leakage V33D,;

    so , we will remove  PWR board pull-up resister , it's resolved this issue;

    thanks!