TPS3431-Q1: Did ti have more simple watchdog part than TPS3431-Q1?

Hi Alpha,

Yes, the TPS3431-Q1 is good enough for you. 

Ben

Hi Alpha,

Just curious, do you only need to watchdog timer for your application?  Does the application also requires a supervisor as well?

Ben

Hi Ben,

 I don't need the supervisor feature.

That is why I ask is there more simple part only watchdog timer?

Can you view the design too?

I hoped the tWD is 30s.

thanks.

Alpha

Hi Alpha,

The schematic did not come through.  Can you please send it again but when you do, use this to upload your schematic.

All of our watchdog timer parts include voltage supervision.

Ben

Hi Ben,

 Did you have more simple part or TPS3431-Q1  is good to me?

Sch is as below and set tWD around 30s.

thanks.

Alpha

Hi Ben,

 I understood the TPS3431-Q1 is good to me now. Please help review the sch further.

thanks.

Alpha

Hi Alpha,

Any reason for R2925 on the SET1 pin?  SET1 in a logic input so you dont need to have R2925.  

Is the EN pin just floating or is tied to a logic signal?

Overall, the circuit looks great Alpha!  Please feel free to reach out to me if you have any other questions.

Ben

Hi Ben,

I just didn't prefer to tie the SET1 and EN to power rail STBY_3V3.

I have no further questions now.

thanks.

Alpha

Hi Alpha,

If you believe I have answered all of your questions, please feel free to close this thread.  If you other questions in the future, you can start a new thread.  Thanks!

Ben

Hi Ben,

Last question: Place R2925 10Kohm ok?

thanks.

Alpha

HI Alpha,

Yes, that should be fine.  Again, the input to SET1 is a logic.

Ben

Hi Ben,

 What is the tps3431-q1 WDO maximum output driving current?

thanks.

Alpha

Hi Ben,

 What is the tps3431-q1 WDO maximum output driving current when WDO is HIGH?

thanks.

Alpha

Hi Alpha,

WDO is a open-drain active low output.  It has no output driving current capability.  

Ben