ATMEGA644PA-AUR - 8-Bit AVR MCU 64KB Flash 20MHz TQFP-44 | Microchip
部品番号: ATMEGA644PA-AUR ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $2.05 | $2.05 |
| 10 | $1.95 | $19.50 |
| 100 | $1.86 | $186.00 |
| 500 | $1.82 | $910.00 |
| 1,000 | $1.78 | $1,780.00 |
ATMEGA644PA-AUR 概要
An 8-bit microcontroller is an integrated circuit that executes program instructions and controls peripherals using an 8-bit-wide CPU data path. Within the embedded systems hierarchy, the ATmega644PA belongs to the AVR ATmega family of flash-based MCUs, which sits under the broader categories of microcontrollers, embedded processors, and semiconductors. Single-cycle instruction execution allows system designers to optimize power consumption versus processing speed, approaching one MIPS per megahertz.
Key features include 131 powerful instructions with mostly single-clock cycle execution, 32 general purpose working registers, an on-chip 2-cycle hardware multiplier, and Microchip's picoPower technology for ultra-low sleep-mode current. Peripherals comprise three flexible timer/counters with compare modes and PWM, two USARTs, a byte-oriented Two-Wire serial interface (TWI/I2C), an 8-channel 10-bit ADC, a real-time counter, and SPI for in-system programming.
Architecturally, the device uses a Harvard-architecture AVR RISC core with separate program and data buses, enabling read-while-write flash operation and deterministic single-cycle execution. The 64 KB self-programmable ISP flash supports bootloader firmware updates in the field, while the 2 KB EEPROM retains calibration data through power cycles.
Typical applications include industrial automation controllers, sensor data loggers, embedded human-machine interfaces, motor control panels, battery-powered instrumentation, and educational/prototyping boards where a large flash map and rich peripheral set are required.
A key design consideration is supply voltage: the device operates across the industrial range, so choose clock frequency and BOD (brown-out detector) settings according to the rail used to guarantee margin across temperature.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
ドロップイン代替品: ATMEGA644PA-AUR — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ATMEGA644PA-AUR （同一形状・フットプリント） — 相違点: ADC, Package, Timer/Counters, RoHS Status, Core Architecture.
クイック比較ツール — 並列比較する代替部品を選択:
ATMEGA644P-20AUR
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ATMEGA644-20AU
✅ ドロップイン✓ 在庫あり
$4.96 / 個
データシートを見る →ATMEGA1284P-AUR
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ATMEGA324PA-AUR
✅ ドロップイン✓ 在庫あり
$1.98 / 個
データシートを見る →ATMEGA644P-15AZ
✅ ドロップイン✓ 在庫あり
$4.98 / 個
データシートを見る →ATMEGA644PV-10AUR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ATMEGA644PA-AUR 最大定格＆電気的特性
| Core Architecture | 8-bit AVR RISC (Harvard) |
| Flash Memory (ISP) | 64 KB (32K x 16) with read-while-write |
| SRAM | 4 KB |
| EEPROM | 2 KB |
| 最大クロック周波数 | 20 MHz |
| Maximum Throughput | 20 MIPS (1 MIPS per MHz) |
| Instructions | 131 instructions, mostly single-clock cycle |
| Hardware Multiplier | On-chip 2-cycle multiplier |
| General Purpose I/O | 32 lines |
| Working Registers | 32 general purpose |
| Timers/Counters | 3 flexible timer/counters with compare modes and PWM |
| USART | 2 |
| Serial Interfaces | TWI (I2C-compatible), SPI |
| ADC | 8-channel 10-bit |
| Real-Time Counter | Yes |
| 電源電圧 | 2.5 V / 3.3 V / 5 V operation |
| パッケージ | 44-TQFP (10 x 10 mm) |
| Low Power Technology | picoPower |
| 実装タイプ | Surface Mount |
| Packaging | Tape & Reel (T/R) |
| RoHS ステータス | Compliant (GREEN) |
ATMEGA644PA-AUR 44-tqfp (10 x 10 mm) ピン配置ガイド
ATMEGA644PA-AUR (44-tqfp (10 x 10 mm) パッケージ) のピン配置。 このデジタルICには、GPIO、通信インターフェース (UART、SPI、I2C)、および電源ピンが含まれています。代替ピン機能と設定オプションについては、メーカーのデータシートを参照してください。組み込みシステム設計とPCBレイアウトに不可欠です。
詳細なピン配置データはありません: ATMEGA644PA-AUR.
詳細は データシート をご参照ください。
主な用途
ATMEGA644PA-AUR の用途: 6 件s: Industrial Automation Controllers, Battery-Powered Sensor Data Loggers, Embedded Human-Machine Interfaces, Motor Control and PWM Actuation, Embedded Instrumentation and Test Equipment, Education and Rapid Prototyping Platforms.
Industrial Automation Controllers
The ATMEGA644PA-AUR fits PLC-style machine controllers because its 64 KB flash hosts protocol stacks and state machines while three timer/counters with PWM drive actuators and the two USARTs link to HMIs and field converters. The 32 GPIO lines provide sufficient parallel I/O for relays, limit switches, and indicator banks without extra port expanders, and the byte-oriented TWI interface chains I2C I/O expanders or EEPROMs as systems grow. Running at 20 MIPS, the AVR core closes control loops in the millisecond range typical of industrial equipment. Surface-mount TQFP-44 assembly suits conformal-coated control boards, and the industrial temperature rating supports cabinet-mounted electronics.
おすすめ
Battery-Powered Sensor Data Loggers
The picoPower architecture is the deciding factor here: the ATMEGA644PA-AUR's low power-down sleep current lets a logger run for months to years on primary cells when waking periodically via watchdog or asynchronous timer. The 8-channel 10-bit ADC on port A digitizes up to eight analog sensors without an external front end, and 4 KB SRAM buffers sampled data before block writes to the 2 KB EEPROM or an SPI flash. The 64 KB flash retains both logging firmware and a bootloader for field reconfiguration over one of the two USARTs. Designers should size sleep duty cycles so average current, not peak 20 MHz active current, sets battery life.
おすすめ
Embedded Human-Machine Interfaces
Two USARTs plus TWI make the ATMEGA644PA-AUR effective for front-panel controllers that talk to both a display driver and a host system simultaneously. The 64 KB flash accommodates font tables, localized string sets, and menu logic, while 4 KB SRAM holds framebuffer or line-buffer memory for segmented or small graphic displays. Hardware PWM channels implement backlight dimming and buzzer tones without CPU load, and the 8-channel ADC reads keypads or thermistor-based backlight temperature compensation. The TQFP-44 footprint fits behind standard display bezels, and single-cycle instructions keep scan rates responsive even at modest clock frequencies.
おすすめ
Motor Control and PWM Actuation
Three flexible timer/counters with compare modes generate multiple independent PWM channels for DC motor speed control, servo actuation, and LED intensity, with the 2-cycle hardware multiplier easing PID arithmetic. The ATMEGA644PA-AUR's 20 MHz clock yields PWM resolutions in the kilohertz-carrier range suitable for quiet motor drives, while external interrupts on PD2/PD3 capture encoder pulses for closed-loop feedback. The ADC samples current shunts or thermistors for protection, and the two USARTs report status to a supervisory controller. Designers must observe ADC source-impedance limits when multiplexing current-sense channels during fast PWM cycles.
おすすめ
Embedded Instrumentation and Test Equipment
Bench instruments, environmental meters, and custom test fixtures benefit from the ATMEGA644PA-AUR's balance of analog and digital resources: the 10-bit ADC digitizes sensor channels, hardware timers gate frequency counters, and 64 KB flash stores calibration curves, menus, and logging code. The 2 KB EEPROM preserves calibration constants through power cycles, and the read-while-write flash enables nonblocking data writes. Two USARTs allow simultaneous PC telemetry and module-level control (e.g., a peripheral sensor pod). Because the AVR executes one instruction per clock cycle deterministically, timing measurements are predictable - a practical advantage over cached, pipelined cores in timing-sensitive instruments.
おすすめ
Education and Rapid Prototyping Platforms
The ATmega644PA family is a proven teaching and maker-platform MCU: the AVR core's simple single-cycle instruction set is transparent enough for assembly-level courses, yet the peripheral set (two UARTs, TWI, SPI, PWM, ADC) supports full embedded-systems projects. The 64 KB flash removes the code-size pressure students hit on smaller ATmegas, and 32 GPIO lines drive breadboard-scale I/O directly. Community cores such as MightyCore bring the part into the Arduino IDE, and the same 44-TQFP footprint across the 164/324/644/1284 family lets one PCB support multiple memory variants - an effective way to build scalable lab boards and product prototypes with a single layout.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ATMEGA644PA-AUR — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ATMEGA644P-20AUR | ATMEGA644-20AU | ATMEGA1284P-AUR | ATMEGA324PA-AUR |
|---|---|---|---|---|---|
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB ISP | 64 KB | 64 KB | 128 KB | 32 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 16 KB | 2 KB |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 15 MHz | 10 MHz |
| Low Power Technology | picoPower (PA) | No (P) | No | picoPower (PA) | No (PV low-voltage) |
| USARTs | 2 | 2 | 2 | 2 | 2 |
| GPIO | 32 | 32 | 32 | 32 | 32 |
主な差別化要因
- picoPower sleep architecture （vs ATMEGA644-20AU)
- Largest memory in the drop-in footprint without redesign （vs ATMEGA324PA-AUR)
- Lower unit cost than the 128 KB upgrade path （vs ATMEGA1284P-AUR)
設計ノート
Decouple each VCC pin of the TQFP-44 with a 100 nF ceramic placed within 5 mm of the pin, plus a 10 uF bulk capacitor per supply domain. Connect AVCC to VCC through a low-pass LC filter (e.g., 10 uH with 100 nF/10 uF) to keep ADC noise low, and never let AVCC deviate more than 0.3 V from VCC per the Microchip datasheet. For battery designs, exploit picoPower sleep modes: power-down with watchdog wake typically dominates the energy budget, so profile average current rather than peak active current.
The most common failure mode on ATmega644 boards is an unconnected or mis-set RESET line: keep a 10 kohm pull-up on RESET and consider a 100 nF cap to ground for improved ESD robustness during ISP programming. Second, when switching from ATMEGA644P-20AUR to this PA part, fuse settings are compatible but verify brown-out detector thresholds against the actual supply rail, since the picoPower electrical characteristics shifted slightly. Finally, clock-source fuses (crystal vs internal RC) are the number-one cause of 'bricked' first-programming attempts - set CKOPT and SUT carefully.
Route the crystal (XTAL1/XTAL2, TQFP pins 7-8 area) with short, symmetric traces and local ground guard to minimize jitter; keep it away from PWM and USART switching edges. Use a solid ground plane under the ADC port A traces, and keep analog sensor routing away from LED/PWM nets. For in-field ISP updates, break out MOSI, MISO, SCK, RESET, VCC, and GND to a standard 2x3 ISP header. The 10x10 mm TQFP-44 needs only standard 0.5 mm-pitch reflow rules; no via-in-pad is required on the periphery.
コンプライアンス情報
Distributor listings describe the ATMEGA644PA-AUR as a GREEN (lead-free, halogen-free) industrial-temp part on tape and reel. Formal REACH and conflict-minerals declarations were not present in the provided data and should be confirmed via Microchip's compliance portal.
