attiny85 battery power

Hey guys,

I'm using an attiny85 for a bike light project. I plan to use either one 3.7v lion battery or 3 AAs to power the project.

I was wondering if I can just go ahead and directly power the attiny with the battery or if there should be some sort of capacitor in the setup somewhere?

I searched around but couldn't find any mention of this but seem to remember reading it somewhere.

Thanks Mark

Does the Lithium Ion battery pack include a cutoff circuit?

Do the ATtiny85s have a V at the end (ATtiny85V)?

You should include a 0.1 uF capacitor between GND and VCC. There is a nice tutorial here... http://www.thebox.myzen.co.uk/Tutorial/De-coupling.html

Yes. Wire in a MAX1551/1811 as a battery charge chip too.

Speed grades (V at end is slower), all will work at 3.7V/4.5V:

– ATtiny25V/45V/85V: 0 – 4 MHz @ 1.8 - 5.5V, 0 - 10 MHz @ 2.7 - 5.5V – ATtiny25/45/85: 0 – 10 MHz @ 2.7 - 5.5V, 0 - 20 MHz @ 4.5 - 5.5V