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[avr-chat] AVR on 1 AA bat with just 1 L and 1 C
From: |
hanzl |
Subject: |
[avr-chat] AVR on 1 AA bat with just 1 L and 1 C |
Date: |
Wed, 23 Mar 2005 22:45:25 +0100 |
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. ;-) )