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'[PIC]: Using the PIC to turn off it's own power'
2000\08\23@050646 by Martin Hill

picon face
This is easy to do if you have a power supply chip.  I designed a
performance meter (see it at http://www.race-technology.com) which runs
off two AA batteries using a switching chip to get the +5V, when a
button is pressed to turn it on, the pic starts up and latches the
supply chip shutdown line.  When it is turned off the pic just sets the
line low and off goes the power.

Martin
> Anyone have an idea of how to hook up a logic level MOSFET so that a PIC
> can be push button started but turned off via software?
>
> BAJ

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2000\08\23@060137 by John Lawton Electronics

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face
At 10:05 8/23/00 +0000, you wrote:
> > Anyone have an idea of how to hook up a logic level MOSFET so that a PIC
> > can be push button started but turned off via software?

I needed a 5V regulator so I am using a National LP2957 which has a
/SHUTDOWN line.  Feed the gate or control input from a small electrolytic
charged by the PIC line and the push button, to keep the power on during a
PIC reset.  If you use a reset button, then feed the reset line with an RC
network otherwise if the reset button is held down then the power switch
will drop out!

John


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2000\08\23@201058 by John Mullan

picon face
Do you have part# for suitable pwr supply chip(s)??

John Mullan


-----Original Message-----
From: pic microcontroller discussion list
[.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU]On Behalf Of Martin Hill
Sent: Wednesday, August 23, 2000 6:06 AM
To: PICLISTspamKILLspamMITVMA.MIT.EDU
Subject: [PIC]: Using the PIC to turn off it's own power


This is easy to do if you have a power supply chip.  I designed a
performance meter (see it at http://www.race-technology.com) which runs
off two AA batteries using a switching chip to get the +5V, when a
button is pressed to turn it on, the pic starts up and latches the
supply chip shutdown line.  When it is turned off the pic just sets the
line low and off goes the power.

Martin
> Anyone have an idea of how to hook up a logic level MOSFET so that a PIC
> can be push button started but turned off via software?
>
> BAJ

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2000\08\23@202342 by Wesley Moore

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picon face
Microchip application note AN724, Using PICmicro MCUs to Connect to
Internet via PPP describes a power system where you press a button to turn
the unit on and then it keeps itself on until it is finished, at which
stage it turns off. Obviously it can't turn itself back on.

Wesley

On Wed, Aug 23, 2000 at 08:00:40PM -0400, John Mullan wrote:
> Do you have part# for suitable pwr supply chip(s)??
>
> John Mullan
>
>
> {Original Message removed}

2000\08\23@210451 by 772-3129

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face
> > Anyone have an idea of how to hook up a logic level MOSFET so that a
PIC
> > can be push button started but turned off via software?
>
> This is easy to do if you have a power supply chip.  I designed a
> performance meter (see it at http://www.race-technology.com) which runs
> off two AA batteries using a switching chip to get the +5V, when a
> button is pressed to turn it on, the pic starts up and latches the
> supply chip shutdown line.  When it is turned off the pic just sets the
> line low and off goes the power.

Unless you really absolutely need the power off completely, you could
leave the PIC in sleep mode with the pushbutton hooked to an interrupt.  A
sleeping PIC takes only a few uA.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, .....olinKILLspamspam.....cognivis.com, http://www.cognivis.com

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