Hi,
The schematic is as below:
When we stop feeding WDI( WDI kept low), WDOn is triggering periodically, and WDOn is connected to MRn, so the device is periodically reset, but the RSTn as shown below(green line) is always high(see the picture below).
Right side picture is the zoom in of left side picture.
But if we change R106=24K, R105=12.7ohm, R107=100ohm, then the waveform behaves as expected(shown below).
RSTn pin is periodically triggered low(blue line).
Why the RSTn is not triggered with the original schematic?