Anything is likely to either use some power all the time, or use much higher power when on (like a relay). Why not just use sleep mode, that's what it's designed for!.i2c2k said:hi!
does anybody know a very simple circuit which can turn on the power supply by a short signal and turn off by an other signal.
the aim is to let a microcontroller let itself turn off (without sleep) and turn on by an external signal.
It depends entirely on the application, you have been too vague so far to determine what can and can't be done. Many (if not most?) battery applications without an ON/OFF switch probably use some kind of 'sleep mode' - what devices were you thinking of?.i2c2k said:well... a relay can't be taken into concideration because my device is a battery-driven application.
the reason, why i don't want to use "only" sleep mode is, that there are various other devices which have no sleep mode.