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TPS3430: NO WDO output

Kenny Wang3
Prodigy 20 points
Part Number: TPS3430

Hi support,

I used TPS3430 in my design, but I didn't find any output from WDO.

I didn't know where was wrong in the design. 

Could you help me to review it as below.

PS : GPIO2 is pulled high.

  • 0
    TI__Genius 9375 points

    Kenny,

    Keep in mind that WDO must be pulled up as it is an open-drain active-low output. Please refer to this section in the pin functions as well as how WDO works in 7.3.3.3 in the datasheet. I don't see a pull up resistor connected on your WDO output.

    Thanks,

    Abhinav.

  • 0 in reply to Abhinav.Sharma
    Prodigy 20 points

    Hi Abhinav,

    Thank you so much.

    I added a pull high resistor for WDO, but still no any output.

    After this, I removed the 0 ohm resistor between WDI and GND, and gave a pulse to WDI from GPIO of MCU, the WDO worked.

    So, I think that I can't tie the WDI to ground directly. ( need to pull high WDO first )

    Best regards,

    Kenny