Lpc2000

I had startup issues when the power supply did not ramp up the voltage
fast enough. The reset supervisor will make sure you reached the
operating voltage and then apply the delay. If your CPU is locked up
in a slow startup of the core voltage when peripheral supply already
applied the watchdog might not work. Is there a specification for
these conditions?

--- In lpc2000@yahoogroups.com, "unity0724" <unity0724@...> wrote:
>
> Wow, very tough working condition for that Arm Chip...    
> and interesting...  :)
> 
> May be you should use both power supervisor/monitor chip + external
> Hardware WDT. => WDT "kicks" the CPU again if it does not power up
> properly.
> 
> I've seen some AVR chips flash program-able for WDT always on after
> reset.  (WDT default as on after reset)
> 
> Could you help eMail me your experience after the project??
> Thanks in advance!
> Regards
> 
> 
> --- In lpc2000@yahoogroups.com, "Andrew Berney" <amb@> wrote:
> >
> > Hi all,
> > 
> > We're currently in the process of putting together a device that 
> will be
> > powered via an induction ring and as such there is the potential 
> for the
> > device to lose sufficient power intermittantly.
> > 
> > I was wondering on peoples' general opinion of using an external 
> supervisor
> > chip to ensure a clean startup by keeping reset pulled to ground 
> for a
> > period of around 150 milliseconds.
> >
>