ATmega644PA-MU Datasheet Summary

Device Overview

The ATmega644PA-MU is a low-power CMOS 8-bit microcontroller based on the AVR® enhanced RISC architecture. It features 64KB of In-System Self-programmable Flash program memory, 4KB of EEPROM, and 16KB of SRAM. The device supports a wide range of peripherals and operates in various power-saving modes, making it suitable for embedded control applications.

Key Features

• High-Performance, Low-Power 8-bit AVR® MicrocontrollerAdvanced RISC architecture with 131 powerful instructions, most executed in a single clock cycle.Fully static operation with up to 20 MIPS throughput at 20MHz.On-chip 2-cycle multiplier.High endurance non-volatile memory segments with 10,000 Flash write/erase cycles and 100,000 EEPROM write/erase cycles.Data retention up to 20 years at 85°C and 100 years at 25°C.
• Peripheral FeaturesTwo 8-bit Timer/Counters with separate prescalers and compare modes.One 16-bit Timer/Counter with separate prescaler, compare mode, and capture mode.Real-time counter with separate oscillator.Six PWM channels.8-channel, 10-bit ADC with differential mode and selectable gain (1x, 10x, 200x).Byte-oriented two-wire serial interface.Two programmable serial USARTs.Master/Slave SPI serial interface.Programmable watchdog timer with separate on-chip oscillator.On-chip analog comparator.Interrupt and wake-up on pin change.
• Special FeaturesPower-on reset and programmable brown-out detection.Internal calibrated RC oscillator.External and internal interrupt sources.Six sleep modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended Standby.
• I/O and Packages32 programmable I/O lines.Available in 40-pin PDIP, 44-lead TQFP, 44-pad VQFN/QFN/MLF, 44-pad DRQFN, and 49-ball VFBGA packages.Operating voltages: 1.8 - 5.5V.Speed grades: 0 - 4MHz @ 1.8 - 5.5V, 0 - 10MHz @ 2.7 - 5.5V, 0 - 20MHz @ 4.5 - 5.5V.Power consumption: Active mode 0.4mA at 1MHz, 1.8V, 25°C; Power-down mode 0.1µA; Power-save mode 0.6µA (including 32kHz RTC).
• Development ToolsComprehensive set of development tools including C compilers, macro assemblers, program debugger/simulators, in-circuit emulators, and evaluation kits.QTouch® Library support for capacitive touch buttons, sliders, and wheels.

Pin Configurations

• PDIP/TQFP/VQFN/QFN/MLF40-pin package with specific pinouts for various functions including I/O lines, power supply, oscillator, and peripheral interfaces.
• DRQFN44-pad package with detailed pinouts provided in the datasheet.
• VFBGA49-ball package with specific pinouts for advanced applications.

Memory Map

• Program Memory64KB In-System Self-programmable Flash with read-while-write capabilities.Boot section and application section with independent lock bits.
• Data Memory16KB SRAM for data storage.4KB EEPROM with individual addressability for non-volatile data storage.
• I/O Memory64 I/O registers with direct and indirect addressing modes.Extended I/O space from 0x60 - 0xFF in SRAM for additional I/O functions.

Clock and Power Management

• Clock SourcesOptions include low power crystal oscillator, full swing crystal oscillator, low frequency crystal oscillator, calibrated internal RC oscillator, 128kHz internal oscillator, external clock, and timer/counter oscillator.
• Power ManagementVarious sleep modes to optimize power consumption.System clock prescaler to adjust clock frequency.Brown-out detector to protect against low voltage conditions.

Interrupts and I/O

• InterruptsMultiple interrupt sources including external interrupts, timer/counter interrupts, USART interrupts, and analog comparator interrupt.Interrupt vectors and priorities defined in the datasheet.
• I/O PortsGeneral-purpose I/O ports with support for digital input, digital output, and analog input.Alternate functions for I/O pins including USART, SPI, I2C, and PWM.

Applications

The ATmega644PA-MU is suitable for a wide range of applications, including:

• Embedded control systems
• Industrial automation
• Consumer electronics
• Portable devices
• Communication systems
• For detailed specifications and additional information, refer to the complete datasheet available on the Microchip website.