AVR-Chat

What is your voltage ref set to?

rep

On 9/15/2011 12:46 PM, Phillip Vogel wrote:
>
> Nope. This is a low dropout regulator, and there is plenty of battery 
> voltage. The supply voltage to the chip IS (not "is supposed to be") 
> 3.30V.
>
>
> > -----Original Message-----
> > From: AVR-Chat@yahoogroups.com <mailto:AVR-Chat%40yahoogroups.com> 
> [mailto:AVR-Chat@yahoogroups.com <mailto:AVR-Chat%40yahoogroups.com>] On
> > Behalf Of greggy
> > Sent: Thursday, September 15, 2011 3:36 PM
> > To: AVR-Chat@yahoogroups.com <mailto:AVR-Chat%40yahoogroups.com>
> > Subject: [AVR-Chat] Re: Mega644 Brown Out Detector Problem
> >
> > The regulator probably needs 1 - 1.5 volts head room, which your
> > battery is not supplying. Just remove the regulator. Or use two
> > batteries in series to push the voltage up.
> >
> > --- In AVR-Chat@yahoogroups.com <mailto:AVR-Chat%40yahoogroups.com>, 
> Phillip Vogel <phillip@...> wrote:
> > >
> > >
> > > I'm having what I hope is a minor problem. My circuit contains a
> > mega644p powered by a lithium battery through a 3.3V regulator. There
> > is a 12MHz crystal, and the CKDIV8 fuse is set, resulting in a clock
> > speed of 1.5MHz.
> > >
> > > If I set the brown out detector to 2.7V, the chip never comes out of
> > reset. It starts up OK if I set the BOD to off or 1.8V, but not 2.7V. I
> > have checked the supply voltage, and it is, indeed, 3.30V.
> > >
> > > What am I missing here?
> > >
> >
> >
> >
> >
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