Hello,
I am looking for a relatively simple solution for driving 20 standard (20 mA) leds from AVR Attiny.
- I'd prefer to use some kind of IC (SIPO register?) or IC's instead of discrete transistors. It should be available in DIP package
- I want to use as low number of pins of the uC as possible - preferably serial connection
- It is may happen that all the leds will be lit at the same time so the components must withstand that.
There is a family of port expanders almost secially design for that purpose ..
Here is one example:
"2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
28-Port LED Display Driver and I/O Expander"
**broken link removed**
For more info on port expanders goto:
**broken link removed**