TMS320F28335: TMS320F28335 WatchDog

Frank Lee96

Part Number: TMS320F28335

Hi TI，

I‘m using TMS320F28335 in our project.And we use a standalone watchdog chip in the TMS320F28335's peripheral circuit which need to be fed during 1.6 seconds.I want to know why there is a watchdog in the peripheral circuit and the real meaning of the adding of watchdog?Using it to check the CPU's abnormal work state or to check the timer used in the CPU?

Regards,

Frank

over 7 years ago

0 Vivek Singh over 7 years ago

TI__Guru** 116021 points

This is answered here -

e2e.ti.com/.../2515606

Vivek Singh

0 Frank Lee96 over 7 years ago in reply to Vivek Singh

Intellectual 830 points

Hi Vivek,
In our application that is safe related,we holp adopt some measures to check a few microprocessor abnormities such as the RAM is stuck,the I/O is broken and so on when the microprocessor is running.We also use the timer to timing,so we want to adopt efficient way to check the punctuality of the timer.Because we use a standalone wtchdog chip and the reset time is 1.6 seconds,so I want to know whether it's reasonable to using the fixed 1.6s to check the timer.In detail,I use the timer producing a interrupt about 1.5s and fed the watchdog right away,if the timer is abnormal,the microprocessor would be reset by the watchdog chip,then the device will go wrong but there is no dangerous output.
Best regards.
Frank

0 Vivek Singh over 7 years ago in reply to Frank Lee96

TI__Guru** 116021 points

It has been discussed on other post (duplicate) and resolved.

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TMS320F28335: TMS320F28335 WatchDog