Atmel ATMega328P 8-Bit Microcontroller in 28 pin SMD package. Its like the ATmega168, with double the flash space. 32K of program space. 23 I/O lines, 6 of which are channels for the 10-bit ADC. Runs up to 20MHz with external crystal. The package can be programmed in circuit. 1.8V to 5V operating voltage!

ATmega328P – TQFP

This is Atmel’s high performance, low power 8-bit AVR ATmega328P-AU microcontroller in the TQFP package.

Features:

• 1.8-5.5V operating range
• Up to 20MHz
• Part: ATMEGA328P-AU
• 32kB Flash program memory
• 1kB EEPROM
• 2kB Internal SRAM
• 2 8-bit Timer/Counters
• 1 16-bit Timer/Counter
• RTC with separate oscillator
• 6 PWM Channels
• 8 Channel 10-bit ADC
• Serial USART
• Master/Slave SPI interface
• 2-wire (I2C) interface
• Watchdog timer
• Analog comparator
• 23 IO lines
• Data retention: 20 years at 85C/ 100 years at 25C

Documents:

• ATmega328P Datasheet
• Atmel Product Page