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Re: [avr-chat] AVR on 1 AA bat with just 1 L and 1 C
From: |
Joerg Wunsch |
Subject: |
Re: [avr-chat] AVR on 1 AA bat with just 1 L and 1 C |
Date: |
Thu, 24 Mar 2005 17:30:52 +0100 (MET) |
address@hidden wrote:
> Yes, ATtiny15L does have the band gap reference, so it should be
> possible to determine Vcc.
Why don't you just give the idea a try? An ATtiny15 is quite cheap,
and to be on the safe side, you can always add a fat 6.2 V Z-diode in
your lab experiment to limit the resulting voltage (and maybe an
additional safety diode from the port pin to Vcc). If you use a used
R6 battery (so its internal resistance has already raised a bit), that
should be enough as protection. AVRs are quite robust in practice, as
long as you don't completely overheat them, of feed much too much
current into a single pin.
I've once accidentally inserted an AT90S8515 into an STK500 the wrong
way (+5 V to GND, 0 V to VCC) -- and that part did survive it. I'm
quite impressed. The power-supply circuitry of the STK isn't what I'd
call a `soft' one, so several hundred mA must have been flown. (The
AVR got quite warm indeed.)
Btw., I'm glad people are accepting that avr-chat list so well. We've
been a bit sceptical when transferring the lists from avr1.org to
savannah what to do with avr-chat, so I'm more than happy the
not-so-technical or not-so-GCC discussions now really end up here.
--
cheers, J"org .-.-. --... ...-- -.. . DL8DTL
http://www.sax.de/~joerg/ NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)
- Re: [avr-chat] M8535 ports, (continued)
- 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, 2005/03/24
- 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 <=
- 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
Re: [avr-chat] AVR on 1 AA bat with just 1 L and 1 C, Bob Paddock, 2005/03/24