AVR-Chat

----- Original Message ----- 
From: "Richard Cooke" <rcooke@digitalwavelength.com>
To: <AVR-Chat@yahoogroups.com>
Sent: Thursday, November 30, 2006 12:27 AM
Subject: [AVR-Chat] 3V supply - need regulator?


> Hi Folks,
>
> I'm working on a battery powered consumer product that will use a 3V
> button cell.  I think we've settled on the CR2032 which has a capacity
> of 225uAH.  Our circuit will use an ATtiny13 @ 1MHz along with a few
> other items.  The total current consumption is about 2.65ma when
> always ON.  I think I can reduce that to about 460uA by cycling the power.
>
> My question to the group - can I just use the battery or do you think
> I'll need some type of regulator?
>
> The application will be mostly in the off state.  I'm planning to have
> the unit ON after being plugged into the  item to be controlled and
> then after 10 minutes go into the low power mode and then after 30
> minutes turn itself off.

It;s quite common not to use a regulator when using those cells with the 
very low power MSP430 MCUs. In fact, that's what I'm doing in an application 
that will spend most of its time in sleep mode.

Leon
--
Leon Heller, G1HSM
Suzuki SV1000S motorcycle
leon.heller@bulldoghome.com
http://www.geocities.com/leon_heller