AVR-Chat

Disable all interrupts and put it to sleep?

Cat
----- Original Message ----- 
From: "Reza Naima" <reza@reza.net>
To: <AVR-Chat@yahoogroups.com>
Sent: Tuesday, July 24, 2007 4:06 AM
Subject: [AVR-Chat] [ot] Li-Poly regulation


> So I'm looking at deploying a device with a Li-Poly battery on board.  
> The voltage of a fully charged battery should be 4.2V, and will drop 
> over time.  My application calls for a 3.3V source, and I was looking at 
> using a LDO voltage regulator which has a *fault line to indicate when 
> the voltage out is not correct (i.e. below 3.3v).  At this point, I 
> would like to shut down the device, but I'm not sure how to do it.  If 
> the device shuts down, I expect the voltage to rise above 3.3v, the 
> device will power on again, the voltage will drop, it will shut down 
> again.... et cetera... and just oscillate using up more battery and 
> possibly permanently damaging it. 
> 
> This would seem like a common problem.  Has anyone else run into it -- 
> and if so -- what solutions are available?  I can shut down a lot of the 
> peripherals on the board, but there will be a number of components that 
> I can't shut off and I don't want to run into the situation where the 
> battery is bled dry.
> 
> Thanks in advance!
> Reza
> 
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