Overview
The AT90PWM2/2B/3/3B 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 AT90PWM2/2B/3/3B achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.

Features
• High Performance, Low Power Atmel® AVR® 8-bit Microcontroller
• Advanced RISC Architecture
    – 129 Powerful Instructions - Most Single Clock Cycle Execution
    – 32 x 8 General Purpose Working Registers
    – Fully Static Operation
    – Up to 1 MIPS throughput per MHz
    – On-chip 2-cycle Multiplier
• Data and Non-Volatile Program Memory
    – 8K Bytes Flash of In-System Programmable Program Memory
        • Endurance: 10,000 Write/Erase Cycles
    – Optional Boot Code Section with Independent Lock Bits
• In-System Programming by On-chip Boot Program
• True Read-While-Write Operation
    – 512 Bytes of In-System Programmable EEPROM
• Endurance: 100,000 Write/Erase Cycles
    – 512 Bytes Internal SRAM
    – Programming Lock for Flash Program and EEPROM Data Security
• On Chip Debug Interface (debugWIRE)
• Peripheral Features
    – Two or three 12-bit High Speed PSC (Power Stage Controllers) with 4-bit Resolution Enhancement
        • Non Overlapping Inverted PWM Output Pins With Flexible Dead-Time
        • Variable PWM duty Cycle and Frequency
        • Synchronous Update of all PWM Registers
        • Auto Stop Function for Event Driven PFC Implementation
        • Less than 25 Hz Step Width at 150 kHz Output Frequency
        • PSC2 with four Output Pins and Output Matrix
    – One 8-bit General purpose Timer/Counter with Separate Prescaler and Capture Mode
    – One 16-bit General purpose Timer/Counter with Separate Prescaler, Compare Mode and Capture Mode
    – Programmable Serial USART
        • Standard UART mode
        • 16/17 bit Biphase Mode for DALI Communications
    – Master/Slave SPI Serial Interface
    – 10-bit ADC
        • Up To 11 Single Ended Channels and 2 Fully Differential ADC Channel Pairs
        • Programmable Gain (5x, 10x, 20x, 40x on Differential Channels)
        • Internal Reference Voltage
    – 10-bit DAC
    – Two or three Analog Comparator with Resistor-Array to Adjust Comparison Voltage
    – 4 External Interrupts
    – Programmable Watchdog Timer with Separate On-Chip Oscillator
• Special Microcontroller Features
    – Low Power Idle, Noise Reduction, and Power Down Modes
    – Power On Reset and Programmable Brown Out Detection
    – Flag Array in Bit-programmable I/O Space (4 bytes)
    – In-System Programmable via SPI Port
    – Internal Calibrated RC Oscillator ( 8 MHz)
    – On-chip PLL for fast PWM ( 32 MHz, 64 MHz) and CPU (16 MHz)
• Operating Voltage: 2.7V - 5.5V
• Extended Operating Temperature:
    – -40°C to +105°C