Supervisory Watch Dog Timer using TPS3813

Andrei IRL

Senior Member
Hi.

I was looking for some ideas regarding a watchdog to monitor PICAXE program correct operation.

I have came across a Supervisory Watch Dog Timer TPS3813 (LINK)

Has any one used it in the past?

I am trying to figure out how to set the watchdog to monitor PICAXE program running state.

The manual has Table that outlines the set-up for Operation Modes.

I am confused about the "Window Frame" and "Lower Window Frame"?

Any input would be greatly appreciated?

Outside of that, to keep the TPS3813 from RESETTING PICAXE will i just need to toggle output from high to low within the time interval?

Sorry, i am probably asking about straightforward thing there.

P.S I was planning on using PICAXE28 as it has ReSet pin.

Thanks very much.

Andrei.
 
Last edited:

bpowell

Senior Member
I've never worked with Watchdogs like this...but it looks like the window is the time frame in which you must transition from High to Low...(Transitioning from low to high is what defines the start of that window)...so You'd want to configure the window to be brief long enough that you can work with it in PICAXE terms...but brief enough that you're moving onto program code and not stuck "Petting" the watchdog any longer than necessary.

Watchdogs can be very helpful...I have only worked with the internal WDT (on raw PIC) but I can see how an external device would be just has helpful!
 
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