ATMEGA32L-8AI - 8-bit AVR MCU 32KB Flash 8MHz | Microchip
部品番号: ATMEGA32L-8AI ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $8.2 | $8.20 |
| 10 | $7.42 | $74.20 |
| 100 | $6.85 | $685.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.62 | $5,620.00 |
ATMEGA32L-8AI 概要
An 8-bit microcontroller is a small computer-on-a-chip containing a CPU, memory (Flash for program code, SRAM for runtime data, EEPROM for non-volatile storage), and a rich set of programmable peripherals such as timers, ADC, USART, SPI, and I2C. Within the broader semiconductor taxonomy, an MCU sits under microcontrollers -> embedded processors -> integrated circuits. The AVR family, originally developed by Atmel and now under Microchip, is a RISC (Reduced Instruction Set Computer) architecture known for single-cycle execution of most instructions, making it well-suited to deterministic embedded control. Low-power variants (the 'L' suffix in the part number) support operation down to 2.7V.
Key features of the ATMEGA32L-8AI include 32 programmable I/O lines, an 8-channel 10-bit ADC, two 8-bit timers plus one 16-bit timer, a watchdog timer, an on-chip analog comparator, and full JTAG debug support via the four-wire interface. The device integrates the AVR core with hardware multiplier and 32 working registers, providing up to 8 MIPS throughput at 8MHz.
The architecture uses a Harvard-style bus with separate program and data memories, allowing instruction fetch and data access in a single clock cycle. The on-chip bootloader (via UART) enables in-system programming without external programmers, while JTAG and debugWIRE interfaces support real-time in-circuit emulation. The 10-bit successive-approximation ADC delivers up to 15 ksps with optional noise reduction mode.
Typical applications include industrial control systems, sensor hubs, HVAC controllers, motor control boards, battery-powered instruments, and embedded data loggers. The wide operating voltage range (2.7V to 5.5V) and low-power modes (Power-Save, Power-Down drawing microampere-level currents) make it attractive for energy-conscious designs.
When designing with this part, mind the VCC decoupling (100 nF plus 10 uF bulk), keep the reset pin decoupled to avoid spurious resets, and select the correct fuse configuration for the clock source. The TQFP-44 footprint is industry-standard and broadly drop-in compatible with later ATmega32A and ATmega32U4 derivatives in the same package.
This page synthesizes distributor pricing, drop-in TQFP-44 alternatives, and practical design notes not found in the manufacturer datasheet alone.
ドロップイン代替品: ATMEGA32L-8AI — 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: ATMEGA32L-8AI （同一形状・フットプリント） — 相違点: Package, ADC, Debug Interface, Timers/Counters, Core Architecture.
クイック比較ツール — 並列比較する代替部品を選択:
ATMEGA32L-8AC
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$5.85 / 個
データシートを見る →ATMEGA32L-8AU
✅ ドロップイン✓ 在庫あり
$3.72 / 個
データシートを見る →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-AUR
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$2.96 / 個
データシートを見る →ATMEGA32A-AN
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$3.4 / 個
データシートを見る →ATMEGA329V-8AI
✅ ドロップイン✓ 在庫あり
$4.45 / 個
データシートを見る →ATMEGA32L-8AI 最大定格＆電気的特性
| Architecture | AVR 8-bit RISC |
| Core | AVR |
| Program Memory | 32 KB Flash (in-system programmable) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Maximum CPU Speed | 8 MHz |
| Operating Voltage | 2.7 V to 5.5 V |
| I/O Pins | 32 programmable I/O lines |
| ADC | 8-channel, 10-bit |
| Timers | Two 8-bit + One 16-bit |
| Communication | USART, SPI, I2C (TWI) |
| Watchdog Timer | Yes |
| On-chip Analog Comparator | Yes |
| パッケージ | 44-pin TQFP (10x10 mm) |
| 実装タイプ | Surface Mount |
| 動作温度 | -40C to +85C (industrial) |
| Debug Interface | JTAG / debugWIRE |
| Throughput | 8 MIPS at 8 MHz |
| RoHS ステータス | Compliant |
ATMEGA32L-8AI ピン構成
| ピン 1 | PB0 (XCK0/T0) — Port B bit 0 / USART0 clock / Timer0 input |
| ピン 2 | PB1 (T1) — Port B bit 1 / Timer1 input |
| ピン 3 | PB2 (AIN0/SS) — Port B bit 2 / Analog comparator input / SPI SS |
| ピン 4 | PB3 (AIN1/MOSI) — Port B bit 3 / Analog comparator input / SPI MOSI |
| ピン 5 | PB4 (SS/MISO) — Port B bit 4 / SPI SS or MISO (alt function) |
| ピン 6 | PB5 (MOSI) — Port B bit 5 / SPI MOSI |
| ピン 7 | PB6 (MISO) — Port B bit 6 / SPI MISO |
| ピン 8 | PB7 (SCK) — Port B bit 7 / SPI clock |
| ピン 9 | RESET — Reset input (active low) |
| ピン 10 | VCC — Digital supply voltage |
| ピン 11 | GND — Digital ground |
| ピン 12 | XTAL2 — Crystal oscillator output |
| ピン 13 | XTAL1 — Crystal oscillator input |
| ピン 14 | PD0 (RXD) — Port D bit 0 / USART0 RXD |
| ピン 15 | PD1 (TXD) — Port D bit 1 / USART0 TXD |
| ピン 16 | PD2 (INT0) — Port D bit 2 / External interrupt 0 |
| ピン 17 | PD3 (INT1) — Port D bit 3 / External interrupt 1 |
| ピン 18 | PD4 (OC1B) — Port D bit 4 / Timer1 output compare B |
| ピン 19 | PD5 (OC1A) — Port D bit 5 / Timer1 output compare A |
| ピン 20 | PD6 (ICP1) — Port D bit 6 / Timer1 input capture |
| ピン 21 | PD7 (OC2) — Port D bit 7 / Timer2 output compare |
| ピン 22 | PC0 (SCL) — Port C bit 0 / I2C SCL |
| ピン 23 | PC1 (SDA) — Port C bit 1 / I2C SDA |
| ピン 24 | PC2 (TCK) — Port C bit 2 / JTAG TCK |
| ピン 25 | PC3 (TMS) — Port C bit 3 / JTAG TMS |
| ピン 26 | PC4 (TDO) — Port C bit 4 / JTAG TDO |
| ピン 27 | PC5 (TDI) — Port C bit 5 / JTAG TDI |
| ピン 28 | PC6 (TOSC1) — Port C bit 6 / Timer oscillator pin 1 |
| ピン 29 | PC7 (TOSC2) — Port C bit 7 / Timer oscillator pin 2 |
| ピン 30 | VCC — Digital supply voltage (second VCC pin) |
| ピン 31 | AVSS — Analog ground |
| ピン 32 | GND — Digital ground (second GND pin) |
| ピン 33 | AREF — ADC analog reference voltage |
| ピン 34 | PA7 (ADC7) — Port A bit 7 / ADC channel 7 |
| ピン 35 | PA6 (ADC6) — Port A bit 6 / ADC channel 6 |
| ピン 36 | PA5 (ADC5) — Port A bit 5 / ADC channel 5 |
| ピン 37 | PA4 (ADC4) — Port A bit 4 / ADC channel 4 |
| ピン 38 | PA3 (ADC3) — Port A bit 3 / ADC channel 3 |
| ピン 39 | PA2 (ADC2) — Port A bit 2 / ADC channel 2 |
| ピン 40 | PA1 (ADC1) — Port A bit 1 / ADC channel 1 |
| ピン 41 | PA0 (ADC0) — Port A bit 0 / ADC channel 0 |
| ピン 42 | AVCC — Analog supply voltage |
| ピン 43 | GND — Digital ground (third GND pin) |
| ピン 44 | VCC — Digital supply voltage (third VCC pin) |
主な用途
ATMEGA32L-8AI の用途: 6 件s: Industrial Sensor Hub, Battery-Powered Data Logger, HVAC Climate Controller, Motor Control Board, Embedded User Interface Panel, Educational / Maker Development Board.
Industrial Sensor Hub
The ATMEGA32L-8AI fits industrial sensor hubs thanks to its 8-channel 10-bit ADC, 32 programmable I/O lines, and 2.7V to 5.5V supply range. At 8 MHz it samples multiple analog sensors (temperature, pressure, flow) and routes data through USART to a host PLC. Its industrial -40C to +85C temperature rating and JTAG debug interface make it well suited to factory-floor deployments where deterministic interrupt response and field serviceability matter. The 32 KB Flash holds a typical Modbus-RTU firmware plus calibration tables with headroom.
おすすめ
Battery-Powered Data Logger
The 'L' suffix of the ATMEGA32L-8AI signals low-power operation; combined with Power-Save and Power-Down modes that draw microampere-level currents, this part suits battery-powered data loggers that wake on timer or interrupt to record sensor samples. Its 1 KB EEPROM stores calibration data and non-volatile log markers without external FRAM. With 8 MHz active CPU speed the device wakes, captures, and returns to sleep fast enough to keep average current in the sub-100 uA range across typical 10-second logging intervals, extending coin-cell or Li-SOCl2 battery life to years.
おすすめ
HVAC Climate Controller
The ATMEGA32L-8AI's 32 I/O lines directly drive HVAC actuator triacs, fan PWM outputs, and a character LCD via parallel interface, while its three timers handle closed-loop fan speed control and defrost scheduling. The 10-bit ADC reads thermistor bridges for supply/return air, and the I2C (TWI) bus interfaces to an external RTC and EEPROM for schedule storage. Industrial temperature grade ensures reliable operation in unconditioned plant rooms. The 32 KB Flash holds complex scheduling logic and a USB bootloader for firmware updates.
おすすめ
Motor Control Board
For brushed DC and stepper motor control, the ATMEGA32L-8AI's 16-bit Timer/Counter1 generates precise PWM with hardware dead-time insertion, while its fast 8-bit timers handle quadrature encoder inputs. The 32 I/O lines interface to H-bridge drivers, current-sense amplifiers, and limit switches. At 8 MHz CPU speed, the control loop fits in well under 100 us, providing smooth torque regulation. The industrial temp grade ensures reliable operation near motor windings where ambient temperatures routinely exceed 60C in enclosed cabinets.
おすすめ
Embedded User Interface Panel
The ATMEGA32L-8AI drives character and small graphic LCDs, scan-matrix keypads, and rotary encoders from its 32 I/O lines, while USART talks to a host controller for back-office data. The 32 KB Flash supports a button-debounce FSM, multi-screen menu logic, and I2C peripherals (EEPROM for settings, RTC for timestamps) without external memory. JTAG debug accelerates bring-up of the keypad scanning algorithm. The TQFP-44 footprint suits compact hand-held enclosures common in industrial operator panels.
おすすめ
Educational / Maker Development Board
The ATMEGA32L-8AI appears in low-cost AVR development boards and teaching kits thanks to its through-hole-friendly TQFP-44 breakout availability, native JTAG/debugWIRE for step-through debugging, and free AVR Studio toolchain support. Students learn ADC sampling, timer interrupts, and USART communication on a real industrial-grade MCU. The on-chip bootloader simplifies firmware upload over a USB-to-serial cable without an external programmer, making classroom deployment straightforward. 32 KB Flash accommodates substantial student projects with multiple peripherals active.
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: ATMEGA32L-8AI — 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 | ATMEGA32L-8AC | ATMEGA32L-8AU | ATMEGA32A-AU | ATMEGA32A-AUR | ATMEGA32A-AN | ATMEGA329V-8AI |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-44 | TQFP-44 (same) | TQFP-44 (same) | TQFP-44 (same) | TQFP-44 (same) | TQFP-44 (same) | TQFP-44 (same) |
| Core / Architecture | AVR 8-bit | AVR 8-bit | AVR 8-bit | AVR 8-bit | AVR 8-bit | AVR 8-bit | AVR 8-bit |
| Program Memory | 32 KB Flash | 32 KB Flash | 32 KB Flash | 32 KB Flash | 32 KB Flash | 32 KB Flash | 32 KB Flash |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| Maximum Frequency | 8 MHz | 8 MHz | 8 MHz | 16 MHz (configurable to 8 MHz) | 16 MHz (configurable to 8 MHz) | 16 MHz (configurable to 8 MHz) | 8 MHz |
| Operating Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 1.8 V to 5.5 V |
| Temperature Grade | Industrial -40C to +85C | Commercial 0C to +70C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C |
| RoHS / Lead-Free | RoHS compliant | RoHS compliant | Pb-free / lead-free | Pb-free / lead-free | Pb-free / lead-free | Pb-compliant variant | RoHS compliant |
主な差別化要因
- Original ATmega32 silicon with industrial temperature grade （vs ATMEGA32L-8AC)
- Modern ATmega32A revision with lower active current （vs ATMEGA32A-AU)
- Same TQFP-44 package vs. ATmega328P-PU 45Hz-class compact MCU （vs ATmega328P-PU)
- TQFP-44 surface-mount vs. PDIP-40 through-hole ATmega32A-PU （vs ATmega32A-PU)
設計ノート
Estimated: At VCC = 5V, 8 MHz active CPU speed, the ATMEGA32L-8AI draws approximately 10-15 mA active. Place a 100 nF decoupling capacitor close to each VCC pin (10, 30, 44) and a single 10 uF bulk capacitor on the supply rail. AVCC (pin 42) must be tied to VCC with its own 100 nF + 10 uF LC filter to keep ADC noise low; otherwise ADC readings will show 5-10 LSB jitter.
Keep the crystal traces (XTAL1/XTAL2, pins 12/13) short and surrounded by a ground pour on both sides of the PCB to minimize EMI. For noise-sensitive designs, use a 4-layer PCB with the inner layer dedicated to ground; for hobby projects a 2-layer PCB works if the crystal area is kept clear. The RESET pin (pin 9) should have a 10 kohm pull-up to VCC and a 100 nF capacitor to ground for proper brown-out behavior.
The ATMEGA32L-8AI ships from the factory with the internal 1 MHz RC oscillator enabled and CKDIV8 fuse set, meaning most new parts run at 1 MHz by default. If your firmware assumes 8 MHz, the timing routines will be off by 8x. Either program the correct fuse settings before first use or include AVR LibC's F_CPU definition in your toolchain to match the actual operating frequency. Also, the JTAGEN fuse is enabled by default - disable it if you need PC2-PC5 as GPIO.
Estimated: At maximum VCC (5.5V) and 8 MHz active, power dissipation is roughly 50 mW worst-case (VCC x I_active = 5.5V x 9 mA). The TQFP-44 package has theta_JA around 50 C/W, so junction temperature rise above ambient is only ~2.5 C - thermal management is not a concern for this part. However, if your design forces the part into a sealed enclosure with no airflow, ensure ambient stays below 70 C to provide adequate margin to the 85 C industrial limit.
コンプライアンス情報
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified; for automotive use select a -Q1 suffix variant. Halogen-free and lead-free per Microchip material content disclosures.