The ATtiny25/45/85 are small, low-power 8-bit microcontrollers from Atmel (now part of Microchip) with AVR architecture. They feature 2–4 KB flash memory, 128–256 bytes SRAM, and 6 I/O pins. With clock speeds up to 20 MHz, these microcontrollers are ideal for compact embedded applications like sensors, LEDs, or small robots. They are commonly used in DIY electronics, wearable devices, and low-cost prototypes.
| Microcontroller | ATtiny25/45/85 |
|---|---|
| Architecture | 8-bit AVR |
| Operating Voltage | 2.7V to 5.5V |
| Clock Speed | Up to 20 MHz |
| Flash Memory | 2 KB (ATtiny25), 4 KB (ATtiny45/85) |
| SRAM | 128 Bytes (ATtiny25), 256 Bytes (ATtiny45/85) |
| EEPROM | 128 Bytes (ATtiny25), 256 Bytes (ATtiny45/85) |
| Digital I/O Pins | 6 (ATtiny25), 8 (ATtiny45/85) |
| Analog Inputs | 4 (ATtiny25/45/85) |
| PWM Outputs | 4 (ATtiny25/45/85) |
| Max DC Current per I/O Pin | 40 mA |
| Temperature Range | -40°C to 85°C |
