Lpc2000

--- In lpc2000@yahoogroups.com, "jan_c_weber" <jan.weber@b...> wrote:
> 
> --- In lpc2000@yahoogroups.com, "maestral64" <maestral64@y...> wrote:
> > 
> > --- In lpc2000@yahoogroups.com, Shannon Holland <holland@l...> 
> wrote:
> > > The Microchip MCP120T is really easy to use. digikey has them in 
> stock, 
> > > they have an open drain reset output so they are really easy to 
> > > interface to existing circuits (just don't for get the pullup!).
> > > 
> > > Shannon
> > > 
> > > On Jun 6, 2004, at 12:51 PM, itsjustimpossible wrote:
> > > 
> > > > Hi
> > > > We have just received the IAR LPC2106 eval board, and are having
> > > > trouble with power-up resets. I am using the NOHAU PSU that came
> > > > with our other eval board which doesn't have a particularly fast
> > > > rise-time.
> > > >
> > > > I need to lay a board out, but can anyone recommend a decent 
> reset
> > > > device that they have used. MAXIM do some good ones but their 
> lead
> > > > time can be very long.
> > > >
> > > > cheers
> > > > Simon
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > > >Yes, Microchip has few more devices like MCP809/810 and you caln
> > also find ON SEMI MAX809TTR.
> > My problem is that I would like to use 'faster' reset, with reset
> > delay time up to 100ms. By datasheet 2114 needs min 10 ms. For
> > Microchip circuit time delay is 140 ms min, up to 0.5 sec(!) max.
> > Any idea/recomendation? Again, I am little bit sceptical to use rC
> > circuit reset in professional stand-alone application.
> > 
> > Regards,
> > Miodrag
> 
> How about the Texas Instruments TPS383x (x = 6, 7, 8) series?
> 
> HTH,
> 
> Jan



Well, 
I found something that looks like perfect solution (and I am always 
concerned when I think something is perfect) - TPS70751 and TPS70851.
5V to 3.3V and 1.8V (dual output) plus  MR and Enable input and RESET
output. 1.2$/1K, 2.18Euro in Digikey. I am checking voltage thresholds
 for reset at the moment. 
Again, that has no sense with new LPC213xx (I am thinking a lot should
I just switch SCH which is almost at the end to new micro.) 
TPS383x is nice IC ( I used it with MSP430) but has one bad feature -
threshold voltage for reset is 2.93V nominal(2.84-2.99).
ARM in general(LPC21xx as well)works from 3-3.6V so 2.93V it could
cause bad reset. 

Miodrag