For ATtiny85 running at a speed of 10-20MHz, the supply voltage should be in the range of 2.7V – 5.5V. The following image shows the Pin Diagram of an 8-pin SOIC ATtiny85.įrom the above pin diagram, you can observe that except for VCC and GND, rest of the 6-pins of ATtiny85 are multiplexed with multiple functionalities. The main difference between these three ICs is the amount of memory each device has (Flash, EEPROM and RAM).ĪTtiny85 Microcontroller, the target device of this project has 8KB of In-system programmable Flash, 512B of EEPROM and 256B of SRAM.Īs mentioned earlier, ATtiny85 is an 8-pin Microcontroller and the most common IC package for ATtiny85 is the 8-pin SOIC. There are three variants of ATtiny85: ATtiny25, ATtiny45 and ATtiny85.
Physically, it needs only 8-pins for complete operation (although some packages like QFN16 use 16-pins just for packaging). It is an 8-bit Microcontroller based on the AVR RISC Architecture. The ATtiny85 Microcontroller is possibly the smallest Microcontrollers available today.
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