Overview
The ATtiny25/45/85 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATtiny25/45/85 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.

Features
• High Performance, Low Power AVR® 8-Bit Microcontroller
• Advanced RISC Architecture
– 120 Powerful Instructions – Most Single Clock Cycle Execution
– 32 x 8 General Purpose Working Registers
– Fully Static Operation
• Non-volatile Program and Data Memories
– 2/4/8K Byte of In-System ProgrammableProgram Memory Flash (ATtiny25/45/85)
• Endurance: 10,000 Write/Erase Cycles
– 128/256/512 Bytes In-System ProgrammableEEPROM (ATtiny25/45/85)
• Endurance: 100,000 Write/Erase Cycles
– 128/256/512 Bytes InternalSRAM (ATtiny25/45/85)
– Programming Lock for Self-Programming Flash Program and EEPROM Data Security
• Peripheral Features
– 8-bit Timer/Counter with Prescaler and Two PWM Channels
– 8-bit High Speed Timer/Counter with Separate Prescaler
• 2 High Frequency PWM Outputs with Separate Output Compare Registers
• Programmable Dead Time Generator
– Universal Serial Interface with Start Condition Detector
– 10-bit ADC
• 4 Single Ended Channels
• 2 Differential ADC Channel Pairs with Programmable Gain (1x, 20x)
– Programmable Watchdog Timer with Separate On-chip Oscillator
– On-chip Analog Comparator
• Special Microcontroller Features
– debugWIRE On-chip Debug System
– In-System Programmable via SPI Port
– External and Internal Interrupt Sources
– Low Power Idle, ADC Noise Reduction, and Power-down Modes
– Enhanced Power-onReset Circuit
– Programmable Brown-out Detection Circuit
– Internal Calibrated Oscillator
• I/O and Packages
– Six Programmable I/O Lines
– 8-pin SOIC
– 20-pin QFN
• Operating Voltage
– 2.7 - 5.5V for ATtiny25/45/85
• Speed Grade
– ATtiny25/45/85: 0 - 8 MHz @ 2.7 - 5.5V, 0 - 16 MHz @ 4.5 - 5.5V
• Automotive Temperature Range
– -40°C to +125°C
• Low Power Consumption
– Active Mode:
• 1 MHz, 2.7V: 300µA
– Power-down Mode:
• 0.2µA at 2.7V