ATMEGA644PA-ANR - 8-bit AVR MCU 64KB Flash 44-TQFP | Microchip
部品番号: ATMEGA644PA-ANR ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $5.2 | $5.20 |
| 10 | $4.68 | $46.80 |
| 100 | $4.16 | $416.00 |
| 500 | $3.74 | $1,870.00 |
| 1,000 | $3.35 | $3,350.00 |
ATMEGA644PA-ANR 概要
A microcontroller (MCU) is a single integrated circuit that combines a processor core, memory, and programmable peripherals into one chip, forming the heart of embedded systems. The ATmega family sits within the broader hierarchy of 8-bit microcontrollers, part of Microchip's AVR line, which is widely used in industrial control, consumer devices, and hobbyist electronics. picoPower technology makes this part a member of the low-power MCU class suited for battery-operated designs.
Key features include an advanced RISC architecture with 131 powerful instructions, most executing in a single clock cycle, and throughput up to 20 MIPS at 20 MHz. Peripherals include two USARTs, an 8-channel 10-bit ADC, a byte-oriented Two-Wire Interface (TWI/I2C), SPI, three flexible timer/counters with compare modes and PWM, a real-time counter, an on-chip 2-cycle multiplier, and an on-chip debug interface. The picoPower technology supports multiple sleep modes for aggressive power reduction.
The ATMEGA644PA-ANR is manufactured in Microchip's high-density nonvolatile memory process, and the ISP Flash can be reprogrammed in-system through the SPI serial interface, by a conventional programmer, or by an on-chip boot program, enabling firmware updates in the field. Verified data lists a 16 MHz speed grade with operation to 105 C and a Tape & Reel (TR) supply format.
Typical applications include industrial automation nodes, sensor acquisition systems using the 10-bit ADC, motor control with PWM timers, and embedded communication products using the dual USARTs or TWI bus.
A key design consideration: the AVR core is fully static, so clock speed can be scaled down to reduce power, and the internal RC oscillator eliminates an external crystal in non-timing-critical designs.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
ドロップイン代替品: ATMEGA644PA-ANR — 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-ANR （同一形状・フットプリント） — 相違点: RoHS Status, Package, SRAM, Core Architecture, EEPROM.
クイック比較ツール — 並列比較する代替部品を選択:
ATMEGA644PA-AUR
✅ ドロップイン✓ 在庫あり
$1.78 / 個
データシートを見る →ATMEGA644PA-AU
✅ ドロップイン✓ 在庫あり
$4.61 / 個
データシートを見る →ATMEGA644P-20PQ
✅ ドロップイン✓ 在庫あり
$7.4 / 個
データシートを見る →ATMEGA644-20AU
✅ ドロップイン✓ 在庫あり
$4.96 / 個
データシートを見る →ATMEGA324PA-AU
✅ ドロップイン✓ 在庫あり
$2.87 / 個
データシートを見る →ATMEGA164PA-AU
✅ ドロップイン✓ 在庫あり
$2.75 / 個
データシートを見る →ATMEGA644PA-ANR 最大定格＆電気的特性
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 16 MHz |
| Program Memory Size | 64 KB (32K x 16) |
| Program Memory Type | FLASH |
| EEPROM Size | 2 KB |
| RAM Size | 4 KB |
| Number of I/O | 32 |
| Oscillator Type | Internal |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Connectivity | I2C, SPI, USART |
| ADC Resolution | 10-bit, 8 channels |
| Architecture Features | 131 instructions, most single-cycle, 2-cycle on-chip multiplier |
| パッケージ / ケース | 44-TQFP (10x10 mm) |
| 動作温度 | -40C to +105C |
| 実装タイプ | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Technology | picoPower |
| RoHS ステータス | Green (RoHS compliant per FindIC listing) |
ATMEGA644PA-ANR 44-tqfp (10x10 mm) ピン配置ガイド
ATMEGA644PA-ANR (44-tqfp (10x10 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-ANR.
詳細は データシート をご参照ください。
主な用途
ATMEGA644PA-ANR の用途: 6 件s: Industrial Automation Nodes, Sensor Acquisition Systems, Motor Control with PWM, Embedded Communication Products, Battery-Powered Portable Devices, Hobby and Rapid Prototyping Platforms.
Industrial Automation Nodes
The ATMEGA644PA-ANR fits industrial automation nodes because it combines 64 KB Flash for protocol stacks and state machines, 32 GPIO lines for driving relays and reading limit switches, and an operating range of -40C to +105C per Mouser data, which covers control-cabinet temperatures. Its two USARTs, TWI (I2C), and SPI buses let one MCU bridge field sensors to a supervisory controller, while the brown-out detector and watchdog timer (WDT peripherals listed in verified data) provide fault recovery in unattended installations. Used as a Modbus-over-UART or TWI slave, the 10 MIPS single-cycle RISC core handles communication framing without external co-processors. The trade-off is that heavy communication workloads are software-polled unless interrupt-driven ISRs are carefully sized within the 4 KB SRAM.
おすすめ
Sensor Acquisition Systems
The ATMEGA644PA-ANR is well matched to sensor acquisition systems because its integrated 8-channel 10-bit ADC digitizes up to eight analog sensor inputs without an external converter, and picoPower sleep modes keep average current low in battery-powered dataloggers. The 4 KB SRAM provides buffering for multi-channel sample streams, and the 2-cycle on-chip multiplier accelerates calibration math such as offset and gain correction in firmware. Designers typically sample via the ADC in interrupt mode, store results in RAM, and stream data out over one USART to a radio or logging module, while the second USART services a debug console. A performance consideration: ADC accuracy depends on AVCC filtering and AREF stability, so decoupling quality directly determines effective resolution in noisy industrial environments.
おすすめ
Motor Control with PWM
The ATMEGA644PA-ANR supports motor control applications through its three flexible timer/counters with compare modes and PWM, listed among the product's peripherals, which generate the gate-drive waveforms for DC motor H-bridges or stepper drivers. The 16 MHz RISC core closes speed and current loops in software, and the 10-bit ADC reads back shunt-resistor current or tachometer feedback. Because the device is fully static, PWM frequency and loop rate can be traded against power consumption. The 32 I/O lines leave headroom for limit switches, encoders, and fault inputs on the same chip. The key trade-off: unlike dedicated motor MCUs, this AVR has no hardware quadrature decoder or FOC accelerator, so commutation complexity is bounded by firmware bandwidth and must be budgeted within the 64 KB Flash.
おすすめ
Embedded Communication Products
With two USARTs, SPI, and a byte-oriented TWI (I2C) interface, the ATMEGA644PA-ANR serves embedded communication products such as protocol converters, gateways, and remote I/O modules. A common topology uses USART1 for the field link (RS-485 via external transceiver), USART0 for a cellular or radio module, and TWI for local configuration EEPROMs or RTCs. The 64 KB ISP Flash with read-while-write support allows an on-chip boot program to download new application firmware through any of these interfaces, enabling field upgrades - a capability explicitly described in the Microchip datasheet. Performance is limited by the 16 MHz clock, so sustained line rates above roughly a few hundred kbps with heavy framing should be benchmarked; the 4 KB SRAM must be partitioned between buffers and stack.
おすすめ
Battery-Powered Portable Devices
The picoPower technology of the ATMEGA644PA-ANR makes it a strong choice for battery-powered portable devices such as hand-held meters, remote controls, and portable instrumentation. The internal oscillator option eliminates crystal drive current in non-timing-critical modes, the core is fully static and can be clocked down to DC, and multiple sleep modes allow the MCU to spend most of its duty cycle in low-current standby while a watchdog or external event wakes it. The 32 GPIOs and 10-bit ADC support front-panel keys and battery-voltage monitoring on one chip. Design consideration: battery life is dominated by sleep-mode and brown-out-detector currents, so these figures from the datasheet electrical characteristics should anchor the power budget estimate rather than active-mode numbers.
おすすめ
Hobby and Rapid Prototyping Platforms
The ATMEGA644PA-ANR is popular in hobby and rapid-prototyping platforms because it is the same AVR architecture as the ubiquitous ATmega328P but offers 4x the Flash (64 KB vs 16 KB) and 4x the SRAM (4 KB vs 1 KB), with the same TQFP-44 pin-compatible family layout. Existing AVR toolchains, ISP programmers, and bootloaders work unchanged, and the internal oscillator plus brown-out reset allow minimal-component breadboard designs. For prototyping, engineers typically wire an ISP header to pins dedicated to SPI (MOSI/MISO/SCK/RESET) so firmware can be iterated without desoldering. The consideration is that the 44-TQFP package requires adapter boards for breadboarding, unlike DIP-packaged ATmega328P parts, so plan a breakout PCB or use a DIP sibling such as ATMEGA644P-20PU for early-stage work.
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-ANR — 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 | ATMEGA644PA-AUR | ATMEGA644P-20PQ | ATMEGA324PA-AU | ATMEGA164PA-AU |
|---|---|---|---|---|---|
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) - same | 44-TQFP - same | 44-TQFP - same | 44-TQFP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 64 KB (32K x 16) | 64 KB | 64 KB | 32 KB | 16 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 2 KB | 1 KB |
| Speed | 16 MHz (listed) | 16 MHz | 20 MHz | 20 MHz | 20 MHz |
| Technology | picoPower | picoPower | picopower (P variant) | picoPower | picoPower |
主な差別化要因
- 4x program memory of mainstream AVR （vs ATMEGA164PA-AU)
- picoPower low-power technology （vs ATMEGA644-20AU)
- Extended temperature operation （vs ATMEGA644PA-AU)
設計ノート
For the 44-TQFP package, decouple both VCC and AVCC pins with 100 nF ceramic capacitors placed within 5 mm of each pin, plus a bulk 10 uF capacitor near the supply entry. Connect AVCC to VCC through an LC filter (ferrite bead plus capacitor) when ADC accuracy matters, because switching noise from digital I/O couples into the ADC reference. Tie AREF to ground through a 100 nF capacitor when using the internal reference, and never drive AREF externally while the internal reference is enabled, per the Microchip datasheet usage guidance.
Route the RESET pin (pin 4 of the TQFP-44) with a 10 kOhm pull-up to VCC and bring it to an ISP header - this enables in-system programming of the 64 KB Flash without desoldering the device, which is essential for field firmware updates via the on-chip boot loader. Keep the XTAL1/XTAL2 crystal traces short (under 10 mm) with guard ground if an external crystal is used; when the internal RC oscillator is sufficient, omit the crystal entirely to save board space and reduce startup time.
Do not exceed the 16 MHz speed grade listed for the -ANR suffix when selecting system clock settings - verified distributor data lists this part at 16 MHz, while 20 MHz-capable siblings exist, so configure fuses for a clock within the rated limit at your supply voltage. When substituting from ATMEGA644P (non-A) parts, re-verify picoPower sleep-mode currents and errata fixes, since the 'PA' variant incorporates power-consumption improvements that firmware power budgets may depend on.
コンプライアンス情報
FindIC lists the part as 'Green' (RoHS-compliant, lead-free). REACH, halogen-free, and conflict-minerals status not stated in verified data.