We have a modem design which uses Q2687RD inside. We only use Airprime Q2687RD modules and all other companents are our own desing. We want to add an external watchdog companent to our device.
Acoourding to software/firmware download, we try to decide what the interval of this watchdog should be. For instance, if it is 15 seconds, will it be enough for DOTA both type 1 and 2? You know on DOTA, i first download the file from FTP and save on A&D memory. Then module restarts with the new firmware/software. I try to decide the best interval for a watchdog so that i can operate firmware/software and other long-responsed tasks.
For Instance, when i execute AT+WOPEN=6,1028 , then module restarts itself and waits until its operation completes. And this takes about 10 seconds. So this means that i need a watchdog whose interval is more than 10 seconds. Like this, i must measure how much time a dota operation takes after adl_install.
I wonder if you use external watchdog in your design and what kind of watchdog is it if you have? What is its time interval?