Other Parts Discussed in Thread: TPS3820
Hi,
My question is about TPS3820(non-Q1).
If DWI is fixed at High when/RESET=Low(Active), is there a problem with the device?
I think there is no problem, is this correct?
Best Regards,
Nishie
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Hi,
My question is about TPS3820(non-Q1).
If DWI is fixed at High when/RESET=Low(Active), is there a problem with the device?
I think there is no problem, is this correct?
Best Regards,
Nishie
Hi Nishie,
When you state "DWI" are you referring to the watchdog timer input, WDI?
For watchdog timer input (WDI), if it is fixed at high or low longer than the time-out period, then a reset will be triggered. When a reset is triggered the watchdog timer is reinitialized.
In your case as long as WDI is fixed at high during a RESET and then resumes normal positive or negative transitions when RESET is not active (when the watchdog is reinitialized) there should be no problem.
Thanks,
Joshua
Hi Joshua-san,
Thank you for your reply.
I'm sorry. My mistake.
DWI means WDI.
when RESET is not active (when the watchdog is reinitialized)
->Is it correct that the watchdog timer is reinitialized after td?
In your case as long as WDI is fixed at high during a RESET and then resumes normal positive or negative transitions when RESET is not active (when the watchdog is reinitialized) there should be no problem.
->In other words, if it is between td, is it OK to fix WDI= High?
Best Regards,
Nishie
Hi Nishie,
I'm sorry. My mistake.
DWI means WDI
No worries!
>Is it correct that the watchdog timer is reinitialized after td?
Yes that is correct.
->In other words, if it is between td, is it OK to fix WDI= High?
As you stated, it is OK to fix WDI high during delay time, td. Just be aware of the accuracy of the delay time (Section 7.8 Switching Characteristics of datasheet) to ensure normal positive or negative transitions after reinitialization.
Thanks,
Joshua