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TPS3306 : startup

GIUSEPPE FERRARO
Prodigy 140 points
Other Parts Discussed in Thread: TPS3306

Hi,

I need to know how can I do to start TPS33'6 when I switch on my board and microcontroller doesn't run correctly so I haven't first toggle on WDI and WDT TPS3306 doesn't start.

I need that it start alone. I'm not sure about transitory state and I need Your help.

regards

G

 

  • 0
    TI__Prodigy 685 points

    Hi G,

     

    Yes, you can disable the watchdog timer by making sure that it is tied to a high imipedence driver or tri-stated input (open). This will allow the internal signal to overwrite the input and not reset, but run continuously.

     

    See the Detailed Descriptoin section of the datasheet for more information.

     

    Regards,

    Sheronda

  • 0 in reply to Sheronda Nash
    Prodigy 140 points

    Hi,

    this is the problem. I didn't explain well my problem, so:

    1. I need WDT

    2. could be that microcontroller doesn't start correctly when I switch on my board

    3. OUT micro that toggle WDI is not CONFIGURED as output ==> microcontroller doesn't control WDI TPS3306

    4. so it means that WDT doesn't start BUT I need that WDT starts

    Q: how can I do?

    Regards

    G

     

  • 0 in reply to GIUSEPPE FERRARO
    TI__Prodigy 685 points

    Sounds like you need to add a pull down resistor to your WDI input. It should be small enough to give you a low level input to the WDT (i.e. smaller than Vdd * 0.3; pg 6 in the datasheet).

    Try using a 16K, or you  can go as small as 1K if your processor can drive it.

    Regards,

    Sheronda