ATMEGA32A-AUR - 16MHz 32KB Flash 8-bit AVR MCU | Microchip
部品番号: ATMEGA32A-AUR ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $5.4 | $5.40 |
| 10 | $4.85 | $48.50 |
| 100 | $4.32 | $432.00 |
| 500 | $3.78 | $1,890.00 |
| 1,000 | $3.35 | $3,350.00 |
| 2,500 | $2.96 | $7,400.00 |
ATMEGA32A-AUR 概要
Background: An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data memory, and peripherals. The ATmega32A belongs to the AVR enhanced RISC family, which executes most instructions in a single clock cycle through a Harvard-style architecture with separate program and data buses. Within the broader hierarchy, this places the ATmega32A as an 8-bit MCU -> microcontroller -> embedded processor -> semiconductor device, serving the industrial, consumer, and automotive-grade embedded markets.
Key features include 16 MIPS throughput at 16 MHz, 32 general-purpose I/O lines, two 8-bit timer/counters plus one 16-bit timer/counter, a USART, an SPI serial interface, and a byte-oriented Two-Wire serial interface. The device supports 131 powerful instructions, operates from 4.5V to 5.5V, and is qualified to industrial temperature ranges for robust embedded deployment.
Technical depth: the AVR core uses a single-cycle multiplier for 16x16-bit hardware multiplication and a unified RISC instruction set that simplifies C-code compilation. The on-chip bootloader lets firmware be updated in situ through any standard interface, eliminating external programming hardware in production flows.
Typical applications include industrial control systems, home automation gateways, sensor hubs, motor control peripherals, and consumer appliances. The wide operating voltage and rich peripheral set allow it to drop directly into designs previously built around the legacy ATmega32, which the ATmega32A is documented as a functionally identical drop-in replacement.
Design consideration: ensure the JTAG pins are reserved or properly disabled when not in use, and place decoupling capacitors within 2mm of each power pin for stable operation across the 4.5V to 5.5V supply range.
This page consolidates distributor pricing, cross-reference alternatives, and application-focused design guidance that is not available on any single manufacturer or distributor product page.
ドロップイン代替品: ATMEGA32A-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: ATMEGA32A-AUR （同一形状・フットプリント） — 相違点: Package, Debug Interface, Core Architecture, ADC, Operating Temperature.
クイック比較ツール — 並列比較する代替部品を選択:
ATMEGA32A-AU
✅ ドロップイン✓ 在庫あり
$2.95 / 個
データシートを見る →ATMEGA32A-AN
✅ ドロップイン✓ 在庫あり
$3.4 / 個
データシートを見る →ATMEGA32A-ANR
✅ ドロップイン✓ 在庫あり
$3.32 / 個
データシートを見る →ATMEGA328P-AUR
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$2.18 / 個
データシートを見る →ATMEGA644P-AU
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ATMEGA329-16AU
✅ ドロップイン✓ 在庫あり
$8.45 / 個
データシートを見る →ATMEGA32A-AUR 最大定格＆電気的特性
| Core Architecture | AVR 8-bit RISC |
| Program Memory (Flash) | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| 最大クロック周波数 | 16 MHz |
| MIPS Throughput | 16 MIPS at 16 MHz |
| Supply Voltage Range | 4.5 V to 5.5 V |
| I/O Pins | 32 |
| ADC | 8-channel, 10-bit |
| Timers/Counters | Two 8-bit, One 16-bit |
| Communication Interfaces | USART, SPI, TWI (I2C) |
| On-Chip Debug | JTAG interface |
| パッケージ | 44-pin TQFP (10x10 mm) |
| 動作温度 | -40C to +85C (industrial) |
| 実装タイプ | Surface Mount |
| Self-Programming | Yes (In-System) |
| Number of Instructions | 131 |
| RoHS ステータス | Compliant |
ATMEGA32A-AUR ピン構成
| ピン 1 | PB5 (MOSI) — SPI MOSI / Port B bit 5 |
| ピン 2 | PB6 (MISO) — SPI MISO / Port B bit 6 |
| ピン 3 | PB7 (SCK) — SPI SCK / Port B bit 7 |
| ピン 4 | RESET — Reset input |
| ピン 5 | VCC — Digital supply voltage |
| ピン 6 | GND — Digital ground |
| ピン 7 | XTAL2 — Crystal oscillator output |
| ピン 8 | XTAL1 — Crystal oscillator input |
| ピン 9 | PD0 (RXD) — USART RXD / Port D bit 0 |
| ピン 10 | PD1 (TXD) — USART TXD / Port D bit 1 |
| ピン 11 | PD2 (INT0) — External interrupt 0 / Port D bit 2 |
| ピン 12 | PD3 (INT1) — External interrupt 1 / Port D bit 3 |
| ピン 13 | PD4 (OC1B) — Timer1 compare B / Port D bit 4 |
| ピン 14 | PD5 (OC1A) — Timer1 compare A / Port D bit 5 |
| ピン 15 | PD6 (ICP1) — Timer1 input capture / Port D bit 6 |
| ピン 16 | PD7 (OC2) — Timer2 compare / Port D bit 7 |
| ピン 17 | AVCC — Analog supply voltage |
| ピン 18 | ADC6 — ADC channel 6 (TQFP-44 only) |
| ピン 19 | ADC7 — ADC channel 7 (TQFP-44 only) |
| ピン 20 | AREF — ADC reference voltage |
| ピン 21 | GND — Analog ground |
| ピン 22 | PC7 — Port C bit 7 |
| ピン 23 | PC6 — Port C bit 6 |
| ピン 24 | PC5 — Port C bit 5 |
| ピン 25 | PC4 — Port C bit 4 |
| ピン 26 | PC3 — Port C bit 3 |
| ピン 27 | PC2 — Port C bit 2 |
| ピン 28 | PC1 (SDA) — TWI SDA / Port C bit 1 |
| ピン 29 | PC0 (SCL) — TWI SCL / Port C bit 0 |
| ピン 30 | PA7 (ADC7) — ADC7 / Port A bit 7 |
| ピン 31 | PA6 (ADC6) — ADC6 / Port A bit 6 |
| ピン 32 | PA5 (ADC5) — ADC5 / Port A bit 5 |
| ピン 33 | PA4 (ADC4) — ADC4 / Port A bit 4 |
| ピン 34 | PA3 (ADC3) — ADC3 / Port A bit 3 |
| ピン 35 | PA2 (ADC2) — ADC2 / Port A bit 2 |
| ピン 36 | PA1 (ADC1) — ADC1 / Port A bit 1 |
| ピン 37 | PA0 (ADC0) — ADC0 / Port A bit 0 |
| ピン 38 | VCC — Digital supply voltage |
| ピン 39 | GND — Digital ground |
| ピン 40 | PB0 (SS) — SPI SS / Port B bit 0 |
| ピン 41 | PB1 (SCK) — SPI SCK alt / Port B bit 1 |
| ピン 42 | PB2 (MOSI) — SPI MOSI alt / Port B bit 2 |
| ピン 43 | PB3 (MISO) — SPI MISO alt / Port B bit 3 |
| ピン 44 | PB4 (OC0) — Timer0 compare / Port B bit 4 |
主な用途
ATMEGA32A-AUR の用途: 7 件s: Industrial Sensor Hubs, Home Automation Gateways, Motor Control Peripherals, Consumer Appliance Controllers, Educational Development Platforms, Security and Access Control Panels, Automotive Aftermarket Accessories.
Industrial Sensor Hubs
The ATMEGA32A-AUR is well-suited to industrial sensor hubs that aggregate readings from multiple analog and digital transducers. Its 8-channel 10-bit ADC enables simultaneous sampling of temperature, pressure, and humidity sensors with sufficient resolution for process monitoring. The 16 MIPS throughput at 16 MHz handles filtering, averaging, and Modbus RTU framing in real time without offloading to a co-processor. The JTAG debug interface supports production-grade firmware bring-up in noisy factory environments.
おすすめ
Home Automation Gateways
The ATMEGA32A-AUR provides enough Flash (32 KB) and SRAM (2 KB) to run a Zigbee or Z-Wave bridging stack alongside a TCP/IP front-end through the SPI-bus-connected Ethernet controller. The wide 4.5V to 5.5V supply range accepts power from typical 5V wall adapters and the 32 GPIO pins can drive relays, triac drivers, and status LEDs directly. Industrial -40C to +85C temperature rating ensures reliable operation in unheated utility closets and attic enclosures.
おすすめ
Motor Control Peripherals
In motor control peripherals such as BLDC or stepper drivers, the ATMEGA32A-AUR delivers deterministic 16 MIPS throughput for trapezoidal commutation, PID loop execution, and current-limit handling. The 16-bit timer/counter supports center-aligned PWM generation for smooth torque control, and the 8-channel ADC samples back-EMF and current-sense amplifiers synchronously to the PWM cycle. The 32 GPIO drive multiple half-bridge gate drivers and end-stop inputs.
おすすめ
Consumer Appliance Controllers
The ATMEGA32A-AUR fits consumer appliance controllers including washing machines, dishwashers, and microwave ovens where its self-programming Flash supports field firmware updates via UART bootloaders. The 32 GPIO drive seven-segment displays, keypads, solenoid valves, and buzzer drivers. The wide operating voltage and industrial temperature range handle line-voltage transients and steam-room environments typical of these products.
おすすめ
Educational Development Platforms
The ATMEGA32A-AUR is a strong choice for university and maker development platforms because the 32 KB Flash, 2 KB SRAM, and full JTAG debug interface give students hands-on experience with interrupts, timers, ADC sampling, and serial communication in a single chip. The TQFP-44 package adapts to breakout boards and the ATmega32A instruction set matches the popular Arduino IDE ecosystem via optiboot or similar bootloaders. Reasonable price per unit supports classroom kits.
おすすめ
Security and Access Control Panels
The ATMEGA32A-AUR serves security and access-control panels where it manages keypad scanning, RFID readers via UART, and alarm relay outputs simultaneously. The self-programming Flash allows secure firmware patches for new credential formats, and the 1 KB EEPROM retains user credentials and event logs across power cycles. JTAG access during development enables cryptographic library integration for OSDP and Wiegand protocols.
おすすめ
Automotive Aftermarket Accessories
The ATMEGA32A-AUR (industrial grade) can be used in aftermarket automotive accessories such as gauge clusters, auxiliary lighting controllers, and alarm systems where its 16 MIPS throughput handles CAN-bus message filtering or PWM dimming for ambient lighting. The wide 4.5V to 5.5V supply tolerates 12V battery rails after pre-regulation. For OEM-grade AEC-Q100 qualified designs, Microchip recommends the automotive-grade ATmega32 family variants instead.
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: ATMEGA32A-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 | ATMEGA32A-AU | ATMEGA32A-AN | ATMEGA32A-ANR | ATMEGA328P-AUR | ATMEGA644P-AU | ATMEGA329-16AU |
|---|---|---|---|---|---|---|---|
| Package | 44-pin TQFP (10x10 mm) | 44-pin TQFP (10x10 mm) - same | 44-pin TQFP (10x10 mm) - same | 44-pin TQFP (10x10 mm) - same | 44-pin TQFP - same | 44-pin TQFP - same | 44-pin TQFP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core Architecture | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 64 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 4 KB | 2 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 2 KB | 1 KB |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 20 MHz | 20 MHz | 16 MHz |
| Operating Temperature Range | -40C to +85C | -40C to +85C | -40C to +105C | -40C to +105C | -40C to +85C | -40C to +85C | -40C to +85C |
| GPIO Pins | 32 | 32 | 32 | 32 | 23 | 32 | 32 (with LCD controller) |
| Packaging | Tape & Reel | Tray | Tray | Tape & Reel | Tape & Reel | Tray | Tray |
主な差別化要因
- Documented drop-in replacement for legacy ATmega32 with optimized manufacturing process （vs ATmega32 (legacy))
- 32 GPIO and 8-channel 10-bit ADC in TQFP-44 （vs ATMEGA328P-AUR)
- Industrial -40C to +85C operating range with 105C extended option （vs ATMEGA32A-AU)
設計ノート
Estimated: at 16 MHz clock the ATMEGA32A-AUR draws approximately 15 mA active supply current. Place 100 nF decoupling capacitors within 2 mm of every VCC/AVCC pin and a 10 uF bulk capacitor at the regulator output to suppress switching transients. Use separate analog (AVCC) and digital (VCC) supplies joined through an LC filter for ADC accuracy, and connect the analog ground pin to the digital ground at a single point near the MCU. The 4.5V to 5.5V supply range requires a regulated rail - do not connect directly to a 5V USB rail without a ferrite bead or LDO for noise isolation.
Estimated: at full 16 MHz operation the TQFP-44 package dissipates under 100 mW, well within the -40C to +85C industrial operating range without a heatsink. For extended-temperature deployments up to 105C using the ATMEGA32A-AN variant, ensure the PCB copper pour under the exposed thermal pad (where present) is at least 100 mm^2 to keep the junction temperature below 125C. In enclosed automotive or industrial cabinets, derate clock frequency to 12 MHz or 8 MHz if ambient exceeds 70C to maintain margin.
Route the JTAG signals (TCK, TMS, TDI, TDO, RESET) with 50 ohm controlled impedance and keep trace lengths under 100 mm to avoid debug-interface glitches. Place the 16 MHz crystal within 5 mm of the XTAL1/XTAL2 pins and guard the traces with a ground ring to attenuate radiated EMI. Avoid routing ADC traces parallel to high-current switching traces; the 10-bit ADC is sensitive to digital noise from PWM outputs. Always include a 4.7 kohm pull-up on the RESET pin to ensure clean power-on behavior.
Do not omit the decoupling capacitors on AVCC and AREF - missing AVCC bypass can corrupt ADC readings by 20 LSB or more. Do not drive the RESET pin low while the internal bootloader is reading program memory or the chip may enter programming mode inadvertently. When using the TWI/I2C interface, add external pull-up resistors of 4.7 kohm on SDA and SCL; the ATmega32A I/O pads do not include the internal pull-ups strong enough for reliable 400 kHz Fast-Mode operation.
コンプライアンス情報
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - for OEM automotive applications use the automotive-grade ATmega32 family. Pb-free and halogen-free per Microchip material declaration.