ATMEGA32L-8MI - 8MHz 32KB Flash AVR MCU | Microchip 44-VQFN
MPN: ATMEGA32L-8MI ✓ Hoạt độngATMEGA32L-8MI Tóm tắt
An AVR microcontroller is an 8-bit RISC processor family that executes most instructions in a single clock cycle, making it well suited for deterministic, low-latency embedded control. Within the broader taxonomy, ATMEGA32L-8MI belongs to the AVR > megaAVR > 8-bit microcontroller > embedded MCU hierarchy, sharing its core with the wider ATmega family while remaining in the voltage/power-optimized "L" sub-line.
Key features include 32 programmable I/O lines, two 8-bit timers plus one 16-bit timer with separate prescaler and compare mode, a USART, an SPI serial interface, an I2C-compatible TWI bus, an 8-channel 10-bit successive-approximation ADC, internal calibrated RC oscillator, and six software-selectable power-saving modes. Power consumption is 1.1 mA active at 1 MHz / 3V / 25°C, dropping to 0.35 mA in Idle and below 1 µA in Power-down with RTC active.
Architecturally, the device combines an enhanced Harvard-style RISC core with 131 powerful instructions, a 32 x 8 general-purpose working register file, and on-chip debug support via JTAG/OCD. The result is a mature, widely-supported platform with a free toolchain (AVR-GCC, Atmel Studio / Microchip Studio) that enables rapid firmware development for industrial and consumer embedded designs.
Typical applications include industrial control nodes, sensor data loggers, low-power battery-powered instruments, motor and lighting controllers, and JTAG-debugged consumer appliances where deterministic 8-bit performance and low quiescent current both matter. The wide 2.7V–5.5V supply window makes it usable from a single Li-ion cell or a regulated 5V rail.
When designing with this MCU, place a 0.1 µF decoupling capacitor close to each VCC pin and provide a 10 µF bulk capacitor on the AVCC rail to keep ADC measurements clean. The internal RC oscillator is factory-calibrated but for UART or USB-grade timing, add an external crystal on XTAL1/XTAL2 matched to the system load capacitance specified in the manufacturer datasheet.
This page synthesizes distributor pricing, drop-in VQFN-44 alternatives from the same ATmega family, and practical design notes beyond the manufacturer datasheet to accelerate BOM selection.
Bộ thay thế dễ dàng lắp đặt cho ATMEGA32L-8MI — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ATMEGA32L-8MI (cùng hình factor và footprint) — khác nhau ở Package, ADC, Instruction Set, Operating Temperature, Mounting Type.
ATMEGA32L-8MU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA32L-8AI
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA329V-8MI
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA325V-8MI
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA32C1-15AZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA32L-8MI Tỷ lệ tối đa & tính chất điện
| Core Architecture | AVR 8-bit RISC |
| Program Memory (Flash) | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Tần số xung maksimum | 8 MHz |
| Operating Voltage Range (L) | 2.7 V to 5.5 V |
| Instruction Set | 131 powerful instructions, mostly single-cycle |
| Throughput | Up to 8 MIPS at 8 MHz |
| Programmable I/O Lines | 32 |
| ADC | 8-channel, 10-bit successive approximation |
| Timers/Counters | Two 8-bit, one 16-bit with separate prescaler |
| Serial Interfaces | USART, SPI, I2C-compatible TWI |
| On-chip Debug | JTAG (OCD) |
| Hộp | 44-pin VQFN (7x7 mm) |
| Kiểu lắp đặt | Surface Mount |
| Active Current @1 MHz, 3V, 25C | 1.1 mA |
| Idle Current @1 MHz, 3V, 25C | 0.35 mA |
| Power-down Current | < 1 µA |
| Operating Temperature (Industrial) | -40C to +85C |
| Trạng thái RoHS | Compliant |
Cấu hình chân ATMEGA32L-8MI
| Chân 1 | VCC — Digital supply voltage |
| Chân 2 | XTAL2 — Crystal oscillator output |
| Chân 3 | XTAL1 — Crystal oscillator input |
| Chân 4 | RESET — Reset input (active low) |
| Chân 5 | PD0 (RXD) — PORTD bit 0 / USART RXD |
| Chân 6 | PD1 (TXD) — PORTD bit 1 / USART TXD |
| Chân 7 | PD2 (INT0) — PORTD bit 2 / External interrupt 0 |
| Chân 8 | PD3 (INT1) — PORTD bit 3 / External interrupt 1 |
| Chân 9 | PD4 (OC1B) — PORTD bit 4 / Timer1 compare B |
| Chân 10 | VCC — Digital supply voltage |
| Chân 11 | GND — Ground |
| Chân 12 | PD5 (OC1A) — PORTD bit 5 / Timer1 compare A |
| Chân 13 | PD6 (ICP) — PORTD bit 6 / Timer1 input capture |
| Chân 14 | PD7 (OC2) — PORTD bit 7 / Timer2 compare |
| Chân 15 | PB0 (T0) — PORTB bit 0 / Timer0 clock |
| Chân 16 | PB1 (T1) — PORTB bit 1 / Timer1 clock |
| Chân 17 | PB2 (AIN0) — PORTB bit 2 / Analog comparator + |
| Chân 18 | PB3 (AIN1) — PORTB bit 3 / Analog comparator - |
| Chân 19 | PB4 (SS) — PORTB bit 4 / SPI slave select |
| Chân 20 | PB5 (MOSI) — PORTB bit 5 / SPI master out |
| Chân 21 | PB6 (MISO) — PORTB bit 6 / SPI master in |
| Chân 22 | PB7 (SCK) — PORTB bit 7 / SPI clock |
| Chân 23 | VCC — Digital supply voltage |
| Chân 24 | GND — Ground |
| Chân 25 | PC0 (SCL) — PORTC bit 0 / TWI clock |
| Chân 26 | PC1 (SDA) — PORTC bit 1 / TWI data |
| Chân 27 | PC2 (TCK) — PORTC bit 2 / JTAG TCK |
| Chân 28 | PC3 (TMS) — PORTC bit 3 / JTAG TMS |
| Chân 29 | PC4 (TDO) — PORTC bit 4 / JTAG TDO |
| Chân 30 | PC5 (TDI) — PORTC bit 5 / JTAG TDI |
| Chân 31 | PC6 (TOSC1) — PORTC bit 6 / Timer0 oscillator |
| Chân 32 | PC7 (TOSC2) — PORTC bit 7 / Timer0 oscillator |
| Chân 33 | AVCC — Analog supply voltage |
| Chân 34 | AREF — ADC reference voltage |
| Chân 35 | GND — Ground |
| Chân 36 | PA7 (ADC7) — PORTA bit 7 / ADC channel 7 |
| Chân 37 | PA6 (ADC6) — PORTA bit 6 / ADC channel 6 |
| Chân 38 | PA5 (ADC5) — PORTA bit 5 / ADC channel 5 |
| Chân 39 | PA4 (ADC4) — PORTA bit 4 / ADC channel 4 |
| Chân 40 | PA3 (ADC3) — PORTA bit 3 / ADC channel 3 |
| Chân 41 | PA2 (ADC2) — PORTA bit 2 / ADC channel 2 |
| Chân 42 | PA1 (ADC1) — PORTA bit 1 / ADC channel 1 |
| Chân 43 | PA0 (ADC0) — PORTA bit 0 / ADC channel 0 |
| Chân 44 | VCC — Digital supply voltage |
Ứng dụng tiêu biểu
ATMEGA32L-8MI phù hợp cho 6 Áp dụngs: Industrial Sensor Data Logger, Battery-Powered Metering Instrument, HVAC Building Automation Node, Lighting and Motor Control MCU, Consumer Appliance Control Board, Automotive Body and Sensor Module.
Industrial Sensor Data Logger
The ATMEGA32L-8MI is well matched to industrial sensor data loggers because its 32 KB Flash fits typical 4–8 kB logger firmwares with headroom for EEPROM-backed configuration. The 8-channel 10-bit ADC handles bridge-type sensors such as load cells, thermocouples via amplifier, or 4–20 mA loops with a shunt. At 3.3 V supply and 1 MHz, the part draws only 1.1 mA active, allowing multi-year battery operation when paired with sleep-mode firmware. The JTAG interface simplifies in-circuit debug of FIFO and SD-card write paths during bring-up.
Được đề xuất
Battery-Powered Metering Instrument
For battery-powered metering, the ATMEGA32L-8MI's <1 µA Power-down mode with RTC running lets the device spend most of its life asleep, waking on a timer or external interrupt to take a measurement. The 2.7 V–5.5 V supply range is friendly to single-cell Li-ion chemistries, and the calibrated internal RC oscillator avoids external crystal current draw at low duty cycles. The 32 programmable I/O lines drive LCD segments or e-ink displays, while the USART streams readings to a host MCU.
Được đề xuất
HVAC Building Automation Node
In HVAC building automation nodes the ATMEGA32L-8MI handles sensor aggregation, setpoint logic, and Modbus or BACnet-style UART communication. The hardware TWI block talks to environmental sensors (temperature, humidity, CO2), while the SPI peripheral drives a local display or radio module. Industrial-grade -40C to +85C operation permits placement in plant rooms and ceiling enclosures without active cooling, and the 32 KB Flash comfortably fits layered HVAC control state machines.
Được đề xuất
Lighting and Motor Control MCU
The ATMEGA32L-8MI's two 8-bit timers and one 16-bit timer with separate prescalers deliver PWM channels for LED dimmers, DC motor speed loops, or stepper acceleration profiles. At 8 MHz the part produces 8-bit PWM with sufficient resolution for flicker-free dimming, and the 32 I/O lines can matrix-scan keypad inputs or rotary encoders simultaneously. The wide 2.7 V–5.5 V range supports both 3.3 V logic and 5 V gate-driver interfaces on the same board.
Được đề xuất
Consumer Appliance Control Board
Small kitchen and home appliances use the ATMEGA32L-8MI to run user-interface state machines, sensor fusion, and safety timers. The JTAG port enables production-line OCD programming and on-board firmware updates, while self-programmable Flash supports bootloader-based field upgrades. With 2 KB SRAM the MCU handles menu state, keypad debouncing, and a UART link to a companion Wi-Fi or BLE module without external memory.
Được đề xuất
Automotive Body and Sensor Module
Automotive body and sensor modules can adopt the ATMEGA32L-8MI's pin-compatible AEC-Q100 sibling, ATMEGA32L-8AI, to meet OEM reliability requirements while keeping the same firmware. The 8-channel 10-bit ADC reads multiple analog sensors (battery voltage, current shunt, thermistor), the USART links to a CAN bridge, and the JTAG block speeds up safety-critical firmware validation. Industrial temperature operation in the standard grade covers under-dash and cabin deployments.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATMEGA32L-8MI — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | ATMEGA32L-8MU | ATMEGA32L-8AI | ATMEGA329V-8MI | ATMEGA325V-8MI | ATMEGA32C1-15AZ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-VQFN (7x7) | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 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 |
| Max Clock Speed | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 15 MHz |
| Operating Voltage | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V | 2.7V to 5.5V |
| Automotive Grade (AEC-Q100) | No | No | Yes | No | No | Yes |
| On-chip CAN | No | No | No | No | No | Yes |
| ADC Channels | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit |
Bảo phân biệt quan trọng
- Low-voltage 2.7V–5.5V operation in compact VQFN-44 footprint (vsATMEGA32L-8PU (PDIP-40))
- Drop-in AEC-Q100 automotive upgrade path (vsATMEGA32L-8AI)
- Optional on-chip CAN peripheral in same footprint (vsATMEGA32C1-15AZ)
Ghi chú thiết kế
Place a 0.1 µF decoupling capacitor as close as possible to each VCC pin (4 VCC pins on the 44-VQFN) and add a single 10 µF bulk capacitor on the supply rail. For AVCC, add a 10 µH inductor or ferrite bead between VCC and AVCC, plus a 100 nF + 10 µF decoupling pair, to keep ADC measurements clean. Tie unused ADC inputs to AVCC or GND through a defined level to avoid floating-channel injection.
The 44-VQFN (7x7 mm) package exposes a thermal pad on the underside; solder it to a copper land with at least 8 thermal vias to the inner ground plane to keep junction temperature low. Keep crystal traces short and symmetric, guard them with a ground ring, and route JTAG signals away from switching nodes to preserve OCD signal integrity.
Do not assume the internal 1 MHz RC oscillator is accurate enough for UART baud rates above 9600; either enable the UART baud-rate compensation in firmware or fit an external crystal matched to the CKSEL fuses for the application. Reset must be held low with an external pull-up (typically 10 kΩ) and a 100 nF capacitor to ground for clean power-on behavior. Setting the wrong CKSEL fuse combination can lock the device; always verify fuse settings using a JTAG or ISP programmer before final deployment.
Thông tin tuân thủ
RoHS and REACH compliance per Microchip product page; lead-free and halogen-free package finish. The ATMEGA32L-8MI itself is not AEC-Q100 qualified - choose the ATMEGA32L-8AI for automotive AEC-Q100 applications.
