ATMEGA325A-AU

The Atmel ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, this microcontroller achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed. The AVR core combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers. The Atmel ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P provides the following features: 16K/32K/64K bytes of In-System Programmable Flash with Read-While-Write capabilities, 512/1K/2K bytes EEPROM, 1K/2K/4K byte SRAM, 54/69 general purpose I/O lines, 32 general purpose working registers, a JTAG interface for Boundary-scan, On-chip Debugging support and programming, three flexible Timer/Counters with compare modes, internal and external interrupts, a serial programmable USART, Universal Serial Interface with Start Condition Detector, an 8-channel, 10-bit ADC, a programmable Watchdog Timer with internal Oscillator, an SPI serial port, and five software selectable power saving modes. The Idle mode stops the CPU while allowing the SRAM, Timer/Counters, SPI port, and interrupt system to continue functioning. The Power-down mode saves the register contents but freezes the Oscillator, disabling all other chip functions until the next interrupt or hardware reset. In Power-save mode, the asynchronous timer continues to run, allowing the user to maintain a timer base while the rest of the device is sleeping. The ADC Noise Reduction mode stops the CPU and all I/O modules except asynchronous timer and ADC, to minimize switching noise during ADC conversions. In Standby mode, the XTAL/resonator Oscillator is running while t

Key features

• High performance, low power Atmel AVR 8-Bit Microcontroller
• Advanced RISC architecture
• 130 powerful instructions – most single clock cycle execution
• 32×8 general purpose working registers
• Fully static operation
• Up to 16MIPS throughput at 16MHz (Atmel ATmega165PA/645P)
• Up to 20MIPS throughput at 20MHz (Atmel ATmega165A/325A/325PA/645A/3250A/3250PA/6450A/6450P)
• On-chip 2-cycle multiplier
• High endurance non-volatile memory segments
• In-system self-programmable flash program memory
• 16KBytes (ATmega165A/ATmega165PA)
• 32KBytes (ATmega325A/ATmega325PA/ATmega3250A/ATmega3250PA)
• 64KBytes (ATmega645A/ATmega645P/ATmega6450A/ATmega6450P)
• EEPROM
• 512Bytes (ATmega165A/ATmega165PA)
• 1Kbytes (ATmega325A/ATmega325PA/ATmega3250A/ATmega3250PA)
• 2Kbytes (ATmega645A/ATmega645P/ATmega6450A/ATmega6450P)
• Internal SRAM
• 1KBytes (ATmega165A/ATmega165PA)
• 2KBytes (ATmega325A/ATmega325PA/ATmega3250A/ATmega3250PA)
• 4KBytes (ATmega645A/ATmega645P/ATmega6450A/ATmega6450P)
• Write/erase cycles: 10,000 flash/100,000 EEPROM
• Data retention: 20 years at 85℃/100 years at 25℃
• Optional Boot Code Section with Independent Lock Bits
• In-System Programming by On-chip Boot Program
• True read-while-write operation
• Programming lock for software security
• Atmel QTouch library support
• Capacitive touch buttons, sliders and wheels
• Atmel QTouch and QMatrix acquisition
• Up to 64 sense channels
• JTAG (IEEE std. 1149.1 compliant) interface
• Boundary-scan capabilities according to the JTAG standard
• Extensive on-chip debug support
• Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG Interface
• Peripheral Features
• Two 8-bit Timer/Counters with Separate Prescaler and Compare Mode
• One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture Mode
• Real time counter with separate oscillator
• Four PWM channels
• 8-channel, 10-bit ADC
• Programmable serial USART
• Master/Slave SPI Serial Interface
• Universal Serial Interface with Start Condition detector
• Programmable Watchdog Timer with separate on-chip oscillator
• On-chip Analog Comparator
• Interrupt and Wake-up on pin change
• Special microcontroller features
• Power-on reset and programmable Brown-out detection
• Internal calibrated oscillator
• External and internal interrupt sources
• Five sleep modes: Idle, ADC Noise Reduction, Power-save, Power-down and Standby
• I/O and packages
• 54/69 programmable I/O lines
• 64/100-lead TQFP, 64-pad QFN/MLF and 64-pad DRQFN
• Speed grade:
• ATmega 165A/165PA/645A/645P: 0 - 16MHz @ 1.8 - 5.5V
• ATmega325A/325PA/3250A/3250PA/6450A/6450P: 0 - 20MHz @ 1.8 - 5.5V
• Temperature range:
• -40℃ to 85℃ industrial
• Ultra-low power consumption (picoPower devices)
• Active mode:
• 1MHz, 1.8V: 215µA
• 32kHz, 1.8V: 8µA (including oscillator)
• Power-down mode: 0.1µA at 1.8V
• Power-save mode: 0.6µA at 1.8V (Including 32kHz RTC)