ATMEGA32L-8MJ - 8-bit AVR MCU 32KB Flash 8MHz | Microchip
料号： ATMEGA32L-8MJ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.42 | $6.42 |
| 10 | $5.78 | $57.80 |
| 100 | $5.14 | $514.00 |
| 500 | $4.63 | $2,315.00 |
| 1,000 | $4.11 | $4,110.00 |
ATMEGA32L-8MJ 概述
An AVR microcontroller is a Harvard-architecture 8-bit RISC device that executes most instructions in a single clock cycle, giving roughly 1 MIPS per MHz. Within the product taxonomy it sits at AVR MCU -> 8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor. The ATmega family is the classic general-purpose AVR line, and the ATmega32 is its 32 KB Flash member with a full peripheral set: 32 general-purpose I/O lines, three flexible timer/counters with compare modes, an 8-channel 10-bit ADC, a programmable watchdog, and a JTAG interface for boundary-scan and on-chip debug.
Key differentiators of the ATMEGA32L-8MJ include its 32 KB self-programming Flash with Read-While-Write, 2 KB SRAM, 1 KB EEPROM, 131 powerful instructions with most executing in a single clock cycle, and 32 general-purpose working registers. The L-suffix low-voltage variant operates from 2.7 V to 5.5 V, making it suitable for battery-powered and 3.3 V systems, while the 44-VQFN (7x7) package with exposed pad saves board area versus the 44-pin TQFP and provides a thermal path.
The device integrates an 8-channel 10-bit successive-approximation ADC, two USARTs, a master/slave SPI, a byte-oriented two-wire serial interface, and an on-chip oscillator with calibration. In-system programming via SPI and JTAG supports field firmware updates without removing the device from the board.
Typical applications include industrial control panels, battery-powered instrumentation, motor control front-ends, consumer appliance controllers, and legacy AVR designs migrating from TQFP to a smaller QFN footprint. The 8 MHz maximum clock at 2.7 V suits low-power sensor nodes where 16 MHz operation is not required.
When designing with this device, note that the 44-VQFN exposed pad must be soldered to a grounded thermal land, and the 8 MHz rating applies across the full 2.7-5.5 V range, whereas 16 MHz parts require at least 4.5 V. Decouple every VCC pin with 100 nF and provide a 10 uF bulk capacitor near the package.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for selection, replacement, and layout decisions.
直接替换替代料： ATMEGA32L-8MJ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATMEGA32L-8MJ （相同外形与封装尺寸） ——差异在于 Package, ADC, Operating Temperature, RoHS Status, Core Architecture.
快速对比工具——选择替代料号进行并排对比：
ATMEGA32L-8MU
✅ 直接替换✓ 有现货
$3.85 / 个
查看数据手册 →ATMEGA32-8MJ
✅ 直接替换📋 参考替代料（不在目录中）
ATMEGA32L-8MI
✅ 直接替换✓ 有现货
$6.08 / 个
查看数据手册 →ATMEGA32L-8AI
✅ 直接替换✓ 有现货
$5.62 / 个
查看数据手册 →ATMEGA32L-8AC
✅ 直接替换✓ 有现货
$5.85 / 个
查看数据手册 →ATMEGA32A-AU
✅ 直接替换✓ 有现货
$2.95 / 个
查看数据手册 →ATMEGA32L-8MJ 最大额定值与电气特性
| Core Processor | AVR 8-bit RISC |
| Program Memory Size | 32 KB (16K x 16) Flash |
| Program Memory Type | In-System Programmable Flash with Read-While-Write |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| 最大时钟频率 | 8 MHz |
| Operating Voltage Range | 2.7 V to 5.5 V |
| Throughput | Up to 8 MIPS at 8 MHz |
| Instruction Set | 131 powerful instructions, most single-clock cycle |
| General Purpose Working Registers | 32 x 8-bit |
| I/O Lines | 32 programmable I/O lines |
| ADC | 8-channel 10-bit successive approximation |
| Timers | Three flexible timer/counters with compare modes |
| Connectivity | Two USART, SPI, Two-wire Serial Interface (I2C) |
| Debug Interface | JTAG (boundary-scan and on-chip debug) |
| 封装 | 44-VQFN Exposed Pad (7x7 mm) |
| 安装类型 | Surface Mount |
| 工作温度 | -40C to +85C |
| RoHS 状态 | Compliant |
ATMEGA32L-8MJ 引脚配置
| 引脚 1 | PB0 — Port B bit 0 / Timer1 input capture |
| 引脚 2 | PB1 — Port B bit 1 / Timer1 PWM output |
| 引脚 3 | PB2 — Port B bit 2 / SPI slave select |
| 引脚 4 | PB3 — Port B bit 3 / SPI master-out slave-in |
| 引脚 5 | PB4 — Port B bit 4 / SPI slave-out master-in |
| 引脚 6 | PB5 — Port B bit 5 / SPI clock |
| 引脚 7 | PB6 — Port B bit 6 / XTAL2 |
| 引脚 8 | PB7 — Port B bit 7 / XTAL1 |
| 引脚 9 | RESET — Reset input (active low) |
| 引脚 10 | VCC — Digital supply voltage |
| 引脚 11 | GND — Ground |
| 引脚 12 | XTAL2 — Crystal oscillator output |
| 引脚 13 | XTAL1 — Crystal oscillator input |
| 引脚 14 | PD0 — Port D bit 0 / USART0 RXD |
| 引脚 15 | PD1 — Port D bit 1 / USART0 TXD |
| 引脚 16 | PD2 — Port D bit 2 / USART0 RXD (alternate) |
| 引脚 17 | PD3 — Port D bit 3 / USART0 TXD (alternate) |
| 引脚 18 | PD4 — Port D bit 4 / Timer1 external clock |
| 引脚 19 | PD5 — Port D bit 5 / Timer1 PWM output |
| 引脚 20 | PD6 — Port D bit 6 / Timer1 PWM output |
| 引脚 21 | PD7 — Port D bit 7 / Timer2 PWM output |
| 引脚 22 | PC0 — Port C bit 0 / ADC0 |
| 引脚 23 | PC1 — Port C bit 1 / ADC1 |
| 引脚 24 | PC2 — Port C bit 2 / ADC2 |
| 引脚 25 | PC3 — Port C bit 3 / ADC3 |
| 引脚 26 | PC4 — Port C bit 4 / ADC4 |
| 引脚 27 | PC5 — Port C bit 5 / ADC5 |
| 引脚 28 | PC6 — Port C bit 6 / ADC6 |
| 引脚 29 | PC7 — Port C bit 7 / ADC7 |
| 引脚 30 | AVCC — Analog supply voltage for ADC |
| 引脚 31 | GND — Ground |
| 引脚 32 | AREF — Analog reference voltage |
| 引脚 33 | PA7 — Port A bit 7 / ADC7 (alternate) |
| 引脚 34 | PA6 — Port A bit 6 / ADC6 (alternate) |
| 引脚 35 | PA5 — Port A bit 5 / ADC5 (alternate) |
| 引脚 36 | PA4 — Port A bit 4 / ADC4 (alternate) |
| 引脚 37 | PA3 — Port A bit 3 / ADC3 (alternate) |
| 引脚 38 | PA2 — Port A bit 2 / ADC2 (alternate) |
| 引脚 39 | PA1 — Port A bit 1 / ADC1 (alternate) |
| 引脚 40 | PA0 — Port A bit 0 / ADC0 (alternate) |
| 引脚 41 | VCC — Digital supply voltage |
| 引脚 42 | GND — Ground |
| 引脚 43 | TDI — JTAG test data input |
| 引脚 44 | TDO — JTAG test data output |
| 引脚 45 | TMS — JTAG test mode select |
| 引脚 46 | TCK — JTAG test clock |
| 引脚 47 | EP — Exposed thermal pad (connect to GND) |
典型应用
ATMEGA32L-8MJ 适用于 6 应用s: Industrial Control Panels, Battery-Powered Instrumentation, Motor Control Front-Ends, Consumer Appliance Controllers, Legacy AVR Design Migration, Sensor Data Loggers.
Industrial Control Panels
The ATMEGA32L-8MJ fits industrial control panels because its 32 KB Flash holds ladder-logic interpreters and HMI firmware, while 32 general-purpose I/O lines directly drive relays, opto-isolators, and status LEDs without external port expanders. Operating from 2.7 V to 5.5 V, it interfaces cleanly with 5 V sensors and 3.3 V logic on the same board. The 8-channel 10-bit ADC samples potentiometers, thermistors, and 4-20 mA loop shunts at up to 15 kSPS, and the three timer/counters generate PWM for valve and heater control. The 44-VQFN exposed pad solders to a grounded thermal land, keeping the die below 85C in cabinet ambient up to 60C. Two USARTs provide simultaneous Modbus RTU and debug console links, and JTAG boundary-scan simplifies production test.
推荐
Battery-Powered Instrumentation
The ATMEGA32L-8MJ is well suited to battery-powered instrumentation because the L-suffix core runs from 2.7 V to 5.5 V, allowing direct operation from a 3.0 V or 3.3 V rail without a boost converter. Multiple sleep modes, including power-down and standby, drop current to microamp levels between measurements, while the 8 MHz maximum clock keeps dynamic power low. The 8-channel 10-bit ADC digitizes strain gauges, thermocouples, and pressure sensors, and the 1 KB EEPROM stores calibration coefficients that survive battery replacement. In-system programming via SPI lets firmware be updated through a pogo-pin fixture without removing the board from the enclosure. The 44-VQFN (7x7 mm) package saves board area compared with a 44-pin TQFP, extending battery life by allowing a smaller cell.
推荐
Motor Control Front-Ends
The ATMEGA32L-8MJ serves motor control front-ends by generating complementary PWM with dead-time insertion from its three timer/counters, driving gate drivers for brushed DC and stepper motors. The 8-channel 10-bit ADC samples current-sense shunts and back-EMF dividers, enabling closed-loop speed and torque control at 8 MIPS. Thirty-two I/O lines handle limit switches, encoder inputs, and fault signals without external glue logic. The 2 KB SRAM buffers commutation tables and PID state, while 32 KB Flash stores motion profiles. Operating from 2.7 V to 5.5 V, the device works with both 3.3 V and 5 V gate-driver logic. The exposed-pad 44-VQFN package improves thermal coupling to the PCB ground plane, which matters when the MCU shares an enclosure with power stages.
推荐
Consumer Appliance Controllers
The ATMEGA32L-8MJ is a natural fit for consumer appliance controllers such as washing machines, dishwashers, and coffee makers, where 32 KB Flash holds user-interface state machines and 32 I/O lines drive buttons, seven-segment displays, and triac gates. The 8-channel 10-bit ADC reads thermistors and water-level sensors, and the watchdog timer ensures safe recovery from brownouts on noisy mains-derived rails. The 2.7-5.5 V range tolerates the wide tolerance of low-cost linear supplies. Two USARTs support optional Wi-Fi or display modules, and the JTAG interface allows factory firmware loading and boundary-scan test. The 44-VQFN (7x7 mm) package with exposed pad reduces board size and improves thermal performance in sealed enclosures where airflow is limited.
推荐
Legacy AVR Design Migration
The ATMEGA32L-8MJ is frequently chosen when migrating legacy ATmega32 designs from the 44-pin TQFP to a smaller QFN footprint. Because the die, memory map, peripheral set, and instruction set are identical to the ATMEGA32L-8AI, firmware compiled for the ATmega32 core runs unchanged; only the PCB land pattern and pin numbering change. The 44-VQFN (7x7 mm) package saves roughly 60 percent of the footprint area versus TQFP-44, enabling denser boards. The exposed pad provides a direct thermal path to the ground plane, improving heat dissipation in sealed enclosures. In-system programming via SPI or JTAG preserves the existing production programming flow, and the 2.7-5.5 V range maintains compatibility with legacy 5 V and modern 3.3 V rails.
推荐
Sensor Data Loggers
The ATMEGA32L-8MJ works well in sensor data loggers because its 1 KB EEPROM stores calibration and configuration data, 2 KB SRAM buffers sample bursts, and 32 KB Flash holds acquisition firmware plus a ring buffer for offline records. The 8-channel 10-bit ADC digitizes analog sensors, while SPI and I2C connect digital sensors and serial Flash or SD-card interfaces. Two USARTs allow simultaneous GPS and telemetry links. Operating from 2.7 V to 5.5 V, the device runs directly from lithium primary cells or 3.3 V rails, and its sleep modes extend field life to months. The 44-VQFN (7x7 mm) package with exposed pad keeps the logger compact and thermally stable in outdoor enclosures, and JTAG debug speeds firmware development.
推荐
推荐产品汇总
工程参考数据： ATMEGA32L-8MJ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ATMEGA32L-8MU | ATMEGA32-8MJ | ATMEGA32L-8MI | ATMEGA32L-8AI |
|---|---|---|---|---|---|
| Package | 44-VQFN (7x7) exposed pad | 44-QFN/MLF | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same | 44-TQFP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB (16K x 16) | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| Maximum Clock | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| ADC Channels | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit |
| I/O Lines | 32 | 32 | 32 | 32 | 32 |
关键差异点
- Low-voltage operation down to 2.7 V （对比 ATMEGA32-8MJ)
- Smaller 44-VQFN (7x7 mm) footprint （对比 ATMEGA32L-8AI)
- Full ATmega32 peripheral set in a low-voltage part （对比 ATMEGA32L-8MU)
设计说明
The 44-VQFN exposed pad must be soldered to a grounded thermal land with a minimum of nine thermal vias (0.3 mm drill) connecting to the internal ground plane. Microchip's ATmega32 datasheet recommends a solder-paste stencil aperture of 50-80 percent pad coverage to prevent voiding. Estimated: with a 0.5 W dissipation and a 4-layer board, the exposed pad plus vias keeps the junction rise below 20C above ambient, well inside the 85C limit.
Decouple every VCC pin (pins 10 and 41) with a 100 nF ceramic capacitor placed within 2 mm of the pin, and add a 10 uF bulk capacitor near the package. The AVCC pin (pin 30) requires its own 100 nF capacitor plus a 10 uH inductor or ferrite bead from VCC to isolate ADC noise. AREF (pin 32) should be bypassed with 100 nF to ground; if the internal reference is used, connect AREF to VCC through a 10 kOhm resistor.
Do not exceed the 8 MHz maximum clock when VCC is below 4.5 V; the ATmega32L is rated for 8 MHz across 2.7-5.5 V, but running a 16 MHz crystal at 3.3 V will cause erratic operation. Also ensure the RESET pin (pin 9) has a 10 kOhm pull-up to VCC and a 100 nF capacitor to ground for reliable power-on reset. Unused I/O pins should be configured as inputs with internal pull-ups or driven low to avoid floating-input current draw.
合规信息
Distributor and manufacturer data list the ATMEGA32L-8MJ as RoHS compliant and lead-free. The standard ATmega32L is not AEC-Q100 qualified; automotive programs should request Microchip's automotive-grade equivalents.
