MCU: attiny25
Package: 8-pin PDIP

1: PB5 ADC0 !Reset dW   PCINT5
2: PB3 ADC3 !OC1B  CLKI XTAL1 PCINT3  
3: PB4 ADC2 OC1B   CLKO XTAL2 PCINT4 
4: Gnd
5: PB0 MOSI DI     SDA  AIN0  OC0A !OC1A  AREF PCINT0
6: PB1 MISO DO     AIN1 OC0B  OC1A PCINT1
7: PB2 SCK  USCK   SCL  ADC1  T0   INT0   PCINT2
8: Vcc

Summary:
The high-performance Microchip picoPower 8-bit AVR RISC-based microcontroller
2 KB ISP flash memory with read-while-write capabilities,
128 Byte EEPROM,
128 Byte SRAM,
6 general purpose I/O lines,
32 general purpose working registers,
2 x 8-bit timer/counters,
4-channel PWM (2 per Timer),
1 comparators,
internal and external interrupts,
In-System Programmable via SPI Port,
4-channel 10-bit A/D converter,
programmable watchdog timer with internal oscillator,
The device operates between 1.8-5.5 volts.
