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RE: [avr-chat] AVR on 1 AA bat with just 1 L and 1 C
From: |
Eric Fu |
Subject: |
RE: [avr-chat] AVR on 1 AA bat with just 1 L and 1 C |
Date: |
Thu, 24 Mar 2005 20:52:45 +1100 |
I think the switching frequency must be sufficiently high to get this to
work. And the switching current must be controlled low enough to avoid
pin damage. It is a good idea though if I'm in the middle of the desert.
For where I am, I would rather use a proper DC/DC boost converter or
charge pump.
Eric Fu
> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden
> On Behalf Of address@hidden
> Sent: Thursday, March 24, 2005 8:45 AM
> To: address@hidden
> Subject: [avr-chat] AVR on 1 AA bat with just 1 L and 1 C
>
>
> Sorry but I just have to share my perverse idea with you.
>
> I think e.g. ATtiny15 could be operated from just one 1.5V
> battery using just one coil and one capacitor and mis-using
> the AVR chip to act as a switched power supply for itself. Look:
>
> ....................
> coil : AVR :
> -------uuuuu----:port vcc:----
> | :pin gnd : |
> --- :..................: --- cap
> = bat | ---
> | | |
> -------------------------+--------------
>
> Strange, is not it? Yes, battery goes to port pin only. Yes,
> on vcc, there's just the cap and nothing else. But wait, I
> think it could
> work:
>
> 1) AVR grounds 'port pin', current flows via coil
>
> 2) AVR leaves 'port pin' floating, current still flows via
> coil and now it charges the cap via internal over-voltage
> protective diode on the pin
>
> Did I miss something?
>
> Well, how to switch it on... Maybe a pushbutton between port
> pin and gnd :-) ? Not a big offense in a perverted design
> like this one...
>
> Bye
>
> Vaclav
>
> P.S. Sorry for being off-topic maybe even on avr-chat but
> there is nobody around who would listen to me just now ;-)
> (Disclaimer: I try to do sane designs most of the time,
> however just now it is not the case. ;-) )
>
>
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>
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- [avr-chat] AVR on 1 AA bat with just 1 L and 1 C, hanzl, 2005/03/23
- Re: [avr-chat] AVR on 1 AA bat with just 1 L and 1 C, Dmitry K., 2005/03/24
- RE: [avr-chat] AVR on 1 AA bat with just 1 L and 1 C,
Eric Fu <=
- Re: [avr-chat] AVR on 1 AA bat with just 1 L and 1 C, Graham Davies, 2005/03/24
- Re: [avr-chat] AVR on 1 AA bat with just 1 L and 1 C, hanzl, 2005/03/24
- Re: [avr-chat] AVR on 1 AA bat with just 1 L and 1 C, René Liebscher, 2005/03/24
- Re: [avr-chat] AVR on 1 AA bat with just 1 L and 1 C, hanzl, 2005/03/24
- Re: [avr-chat] AVR on 1 AA bat with just 1 L and 1 C, Joerg Wunsch, 2005/03/24
- Re: [avr-chat] AVR on 1 AA bat with just 1 L and 1 C, Colin O'Flynn, 2005/03/24
- Re: [avr-chat] AVR on 1 AA bat with just 1 L and 1 C, Brian Dean, 2005/03/24
- Re: [avr-chat] AVR on 1 AA bat with just 1 L and 1 C, Joerg Wunsch, 2005/03/24