I am new to electronics and would appreciate any help. I am trying to design a watchdog timer circuit using the TI WDT (mfg part # TPS3813K33DBVT). I am using it to reset an Arduino (I wish to use an external WDT).
So far so good, it works a treat and I have it asserting an active low to the reset pin of an Arduino. If the WDT is not tickled within the window the Arduino resets as expected. When the reset line is asserted it is held low for 25ms per the datasheet.
I would like to make a change and this is where I am stuck. Instead of asserting the Arduino reset pin I would like to temporarily cut off power to the Arduino. i.e. power cycle for around 60 seconds. The reason is that I will have other modules attached to the Arduino that may not necessarily observe the reset and would need a full power cycle to reboot properly.
I was thinking of using an IC load switch for this purpose like FDC6330L which is essentially always on. Asserting the reset pin would turn off the FDC6330L for 25ms. My attempted circuit is attached .. how can I extend the delay of 25ms to 60s? The max time delay ("td") of the TPS3813K33DBVT is 30ms.