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PICList Thread
'[PIC] Reset Chips'
2002\07\11@180532 by mike

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On Thu, 11 Jul 2002 09:54:22 -0700, you wrote:

>Hi guys,
>
>I've been looking at various PIC projects that are published out on the
>WEB and I find there is a major inconsistency with the reset circuits.
>Some folks use reset chips and others just tie the MCLR to Vcc through a
>resistor.  Given that the MCLR/VPP gets the 13V programming voltage are
>there special reset chips that will handle that? Just put a resistor (e.g. 10K) in series with the reset chip's output.
> Is there even a need
>with the PIC to have a reset chip?
In many real-world applications, absolutely yes. Brownout will easily
put the chip into a state from which the watchdog will not recover. At
least it;s not as vad ad AVRs, which can trash their eeprom in
brownout...!

It all depends on how well you can define the Vcc risetime, and how
easy it is to recover if it does jam up.
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2002\07\11@180746 by mike

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On Thu, 11 Jul 2002 11:29:12 -0600, you wrote:

>At 09:54 AM 7/11/02 -0700, John Dammeyer wrote:
>>Hi guys,
>>
>>I've been looking at various PIC projects that are published out on the
>>WEB and I find there is a major inconsistency with the reset circuits.
>>Some folks use reset chips and others just tie the MCLR to Vcc through a
>>resistor.  Given that the MCLR/VPP gets the 13V programming voltage are
>>there special reset chips that will handle that?  Is there even a need
>>with the PIC to have a reset chip?
>
>I *always* have some form of reset circuit in my products - usually a
>combination of time and supply voltage operated.  I'm told that the higher
>end PICs don't require external reset anymore ... yes, some have on-chip brownout resets, but they take a huge
amount of power compared to external ones, which can be a major issue
for battery powerd apps.

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