'Reset Controllers -- Whats the Cheapest?'
I know this has come up over the last twelve momths, but what reste
controllers do people use, and what is the best prices they have got.
I need to have a reset asserted at 0V for a system that runs at a
nominal 3.3V as it is battery powered.
The decision I need to make is what are the advantages of say the
Dallas DS1816 compared to a little PNP circuit and a few C's and R's,
all comments are welcome!
thanks in advance,
On Wed, 1 Apr 1998 15:42:06 -0800, you wrote:
> I know this has come up over the last twelve momths, but what reste
> controllers do people use, and what is the best prices they have got.
> I need to have a reset asserted at 0V for a system that runs at a
> nominal 3.3V as it is battery powered.
> The decision I need to make is what are the advantages of say the
> Dallas DS1816 compared to a little PNP circuit and a few C's and R's,
> all comments are welcome!
> thanks in advance,
You can get ultra-low power (1uA) reset ics in TO-92, SOT23 and SOT89
>from Holtek, Telcom, Ricoh and a few others. 2V7 is a standard
voltage, but others can usually be supplied to order. Probably cheaper
_/ L_/ Mike Harrison / White Wing Logic / netcomuk.co.uk _/ L_/ wwl
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Dunno if it's the cheapest by the time you count parts
installation and board space, but I like my circuit that uses a 74HC14 as
a combination reset generator and watchdog timer. One section is set up
as an asymmetrical astable multivibrator. On power up, its output is
driven low for a short period of time (since the timing capacitor on the
input is connected to + supply instead of ground). Another section
"kills" the astable, resetting the timer each time a watchdog reset pulse
comes along. The watchdog reset pulse is AC coupled into the circuit so
that a stuck reset does not keep the timer from timing out.
Again, dunno if it's the cheapest...
On Wed, 1 Apr 1998 15:42:06 -0800 Scott Walsh
<PLANTRONICS.COM> writes: Scott.WALSH
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