ATMEGA32A-MNR - 8-bit AVR MCU 32KB Flash 16MHz VQFN-44 | Microchip
料号： ATMEGA32A-MNR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.85 | $5.85 |
| 10 | $5.26 | $52.60 |
| 100 | $4.65 | $465.00 |
| 500 | $4.18 | $2,090.00 |
| 1,000 | $3.75 | $3,750.00 |
ATMEGA32A-MNR 概述
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and a range of peripheral interfaces into one IC. Within the embedded system taxonomy, an 8-bit MCU sits at the base of the complexity hierarchy below 16-bit and 32-bit MCUs, optimized for low power, deterministic real-time response, and simple instruction flow. The AVR family belongs to a modified Harvard RISC architecture where instructions are fetched and data is loaded in parallel, enabling single-cycle execution for most instructions. The ATmega32A is positioned as a mainstream general-purpose 8-bit MCU, suitable when engineers want AVR toolchain compatibility, low cost, and a peripheral set rich enough for motor control, human-interface, and sensing applications.
Key features of the ATMEGA32A-MNR include six software-selectable power-saving modes (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended Standby) plus an internal calibrated RC oscillator. The wide 2.7 V to 5.5 V operating range allows direct connection to a 3.3 V or 5 V rail, and the VQFN-44 (7x7 mm) package with surface-mount construction supports compact PCB designs. The device achieves 16 MIPS throughput at 16 MHz - one MIPS per MHz is characteristic of the AVR enhanced RISC architecture, where most instructions execute in a single clock cycle.
Architecture-wise, the ATmega32A is built around the AVR enhanced RISC core with a two-stage pipeline, allowing instructions and data fetches to occur in parallel. The 32 KB flash is split between the boot program section and the application program section, supporting Read-While-Write for non-volatile data storage. The 10-bit ADC provides 8 single-ended channels with optional differential gain stages, and the integrated analog comparator supports mixed-signal applications such as battery monitoring and sensor conditioning.
Typical applications for the ATMEGA32A-MNR span industrial control panels, HVAC thermostats, home-automation controllers, automotive body and accessory modules (where AEC-Q100 grade is not required), sensor hubs, motor control boards, security keypads, and consumer electronics that need USB-to-UART bridges, LCD drivers, and user-interface handling. When designing with this device, ensure the JTAG pull-up resistors are correctly biased on the four-wire debug interface, or disable JTAG via fuses to free the pins as standard GPIO. Use Atmel Studio 7 or Microchip Studio with a JTAGICE3, AVR Dragon, or Atmel-ICE for in-system programming and debug.
直接替换替代料： ATMEGA32A-MNR ——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： ATMEGA32A-MNR （相同外形与封装尺寸） ——差异在于 Package, Core Architecture, Operating Temperature, EEPROM, SRAM.
快速对比工具——选择替代料号进行并排对比：
ATMEGA32A-AUR
✅ 直接替换✓ 有现货
$2.96 / 个
查看数据手册 →ATMEGA32A-MU
✅ 直接替换📋 参考替代料（不在目录中）
ATMEGA32A-MNR 最大额定值与电气特性
| Core Architecture | AVR enhanced RISC, 8-bit |
| Operating Frequency | 16 MHz max |
| Throughput | 16 MIPS at 16 MHz |
| 电源电压 | 2.7 V to 5.5 V |
| Flash Program Memory | 32 KB (16K x 16), In-System Self-Programmable |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| General-Purpose I/O | 32 lines |
| Working Registers | 32 x 8-bit |
| ADC | 8-channel, 10-bit |
| Timer/Counters | Three (16-bit and 8-bit combined) with compare modes |
| Serial Interfaces | USART, SPI, TWI (I2C-compatible) |
| Debug Interface | JTAG / On-chip Debug |
| 封装 | 44-pin VQFN (7x7 mm), surface mount |
| 工作温度 | -40 C to +105 C |
| Power-Saving Modes | Idle, ADC Noise Reduction, Power-save, Power-down, Standby, Extended Standby |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (Green) |
ATMEGA32A-MNR 引脚配置
| 引脚 1 | VCC — Digital supply voltage |
| 引脚 2 | GND — Digital ground |
| 引脚 3 | XTAL2 — Crystal oscillator output |
| 引脚 4 | XTAL1 — Crystal oscillator input |
| 引脚 5 | RESET — Reset input, active low |
| 引脚 6 | PD0 — Port D bit 0 / RXD |
| 引脚 7 | PD1 — Port D bit 1 / TXD |
| 引脚 8 | PD2 — Port D bit 2 / INT0 |
| 引脚 9 | PD3 — Port D bit 3 / INT1 |
| 引脚 10 | PD4 — Port D bit 4 / OC1B |
| 引脚 11 | PD5 — Port D bit 5 / OC1A |
| 引脚 12 | PD6 — Port D bit 6 / ICP1 |
| 引脚 13 | PD7 — Port D bit 7 / OC2 |
| 引脚 14 | PB0 — Port B bit 0 / SS |
| 引脚 15 | PB1 — Port B bit 1 / SCK |
| 引脚 16 | PB2 — Port B bit 2 / MOSI |
| 引脚 17 | PB3 — Port B bit 3 / MISO |
| 引脚 18 | PB4 — Port B bit 4 / OC0 |
| 引脚 19 | PB5 — Port B bit 5 / OC1A |
| 引脚 20 | PB6 — Port B bit 6 / OC1B |
| 引脚 21 | PB7 — Port B bit 7 / OC2 |
| 引脚 22 | AVCC — Analog supply voltage |
| 引脚 23 | AGND — Analog ground |
| 引脚 24 | AREF — ADC reference voltage |
| 引脚 25 | ADC7 — ADC channel 7 |
| 引脚 26 | ADC6 — ADC channel 6 |
| 引脚 27 | ADC5 — ADC channel 5 / SCL |
| 引脚 28 | ADC4 — ADC channel 4 / SDA |
| 引脚 29 | ADC3 — ADC channel 3 |
| 引脚 30 | ADC2 — ADC channel 2 |
| 引脚 31 | ADC1 — ADC channel 1 |
| 引脚 32 | ADC0 — ADC channel 0 |
| 引脚 33 | GND — Ground |
| 引脚 34 | VCC — Digital supply voltage |
| 引脚 35 | PC0 — Port C bit 0 / SCL |
| 引脚 36 | PC1 — Port C bit 1 / SDA |
| 引脚 37 | PC2 — Port C bit 2 / TCK |
| 引脚 38 | PC3 — Port C bit 3 / TMS |
| 引脚 39 | PC4 — Port C bit 4 / TDO |
| 引脚 40 | PC5 — Port C bit 5 / TDI |
| 引脚 41 | PC6 — Port C bit 6 / TOSC1 |
| 引脚 42 | PC7 — Port C bit 7 / TOSC2 |
| 引脚 43 | TDI — JTAG Test Data In |
| 引脚 44 | GND — Thermal pad / ground |
典型应用
ATMEGA32A-MNR 适用于 7 应用s: Industrial Control Panels, HVAC Thermostats, Home Automation Hubs, Security Keypads and Access Control, Sensor Hub Data Aggregators, Consumer Electronics User Interfaces, Motor Control Boards.
Industrial Control Panels
The ATMEGA32A-MNR fits industrial control panels because its 32 GPIO lines and 2 KB SRAM can drive keypads, character LCDs, status LEDs, and relay boards simultaneously without external bus expanders. The 2.7 V to 5.5 V supply range accepts a wide DC bus, and the -40 C to +105 C industrial temperature rating covers most factory-floor enclosures. Programmable via JTAG, firmware can be updated through the connector on the panel door. The 32 KB flash hosts real-time control loops with PWM for motor or valve actuation.
推荐
HVAC Thermostats
The ATMEGA32A-MNR is well suited for HVAC thermostats because its 8-channel 10-bit ADC reads thermistor, humidity, and airflow sensors simultaneously without an external multiplexer. The three Timer/Counters generate PWM for triac-fired fan and compressor control, while the 2 KB SRAM buffers UI state and scheduling. Six power-saving modes, including Power-save mode running from a 32 kHz watch crystal, allow weeks of battery backup. JTAG debug simplifies bring-up of the seasonal control algorithm.
推荐
Home Automation Hubs
The ATMEGA32A-MNR can act as a room-level home automation hub because its USART, SPI, and TWI (I2C) peripherals bridge to radio modules (nRF24L01, LoRa), sensor breakout boards, and EEPROM storage. The 32 KB flash stores protocol stacks for Modbus, MQTT-SN, or proprietary RF; 2 KB SRAM handles JSON parsing of short messages. The 32 GPIO pins drive wall-switch relays and read contact closures. Surface-mount VQFN-44 (7x7 mm) is small enough to fit behind a wall plate.
推荐
Security Keypads and Access Control
The ATMEGA32A-MNR drives security keypads because its 32 GPIO scan a 4x4 matrix without an external key encoder IC, freeing the 8-channel ADC for tamper-detection switches. The 1 KB EEPROM stores credential tables and audit logs that survive power loss, and the 32 KB flash holds encryption routines plus the user-interface state machine. The integrated USART links to a host controller or wireless module. JTAG allows secure firmware lock via fuse bits during production.
推荐
Sensor Hub Data Aggregators
The ATMEGA32A-MNR is ideal as a sensor hub data aggregator because its 8-channel 10-bit ADC reads multiple analog sensors (temperature, pressure, light) at up to 15 kSps, while SPI and TWI gather digital sensors at the same time. The 2 KB SRAM buffers measurement frames before the USART uploads them to a host PLC or gateway. Power-save mode at 1 MHz extends battery life in remote installations. The 32 KB flash fits Modbus RTU plus calibration tables.
推荐
Consumer Electronics User Interfaces
The ATMEGA32A-MNR powers consumer UI boards because its 32 GPIO drive character LCDs, rotary encoders, button matrices, RGB status LEDs, and buzzer drivers concurrently, with timers generating PWM for backlight dimming and audio feedback. The 32 KB flash hosts full menu logic plus boot loader, while the 1 KB EEPROM holds user preferences. The 2.7 V to 5.5 V range accepts single-cell Li-ion. Surface-mount VQFN-44 keeps the BOM compact for high-volume consumer SKUs.
推荐
Motor Control Boards
The ATMEGA32A-MNR drives small BLDC or stepper motor boards because its three Timer/Counters generate center-aligned PWM at 16 MHz with dead-band insertion, while the 8-channel ADC samples back-EMF and current-sense amplifiers. The 32 GPIO handle Hall sensor inputs, direction logic, and fault interlocks. The 2 KB SRAM holds PID state, and the 32 KB flash runs the field-oriented control loop. JTAG debug accelerates tuning of commutation parameters during development.
推荐
推荐产品汇总
工程参考数据： ATMEGA32A-MNR ——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 | ATMEGA32A-AUR | ATMEGA32A-MU | ATMEGA32A-AU |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | VQFN-44 (7x7) | VQFN-44 (7x7) | VQFN-44 (7x7) | TQFP-44 |
| Core / Architecture | 8-bit AVR enhanced RISC | 8-bit AVR enhanced RISC | 8-bit AVR enhanced RISC | 8-bit AVR enhanced RISC |
| Flash Program Memory | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB |
| Max Operating Frequency | 16 MHz | 16 MHz | 16 MHz | 16 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 |
| GPIO Count | 32 | 32 | 32 | 32 |
| Operating Temperature | -40 C to +105 C | -40 C to +105 C | -40 C to +105 C | -40 C to +105 C |
关键差异点
- Largest flash in 8-bit AVR VQFN-44 family （对比 ATMEGA328P-MU)
- Compact 7x7 mm VQFN-44 footprint （对比 ATMEGA32A-AU)
- Industrial temperature rating （对比 ATMEGA328P-PU)
设计说明
Place a 100 nF decoupling capacitor as close as possible to each VCC/AVCC pair and a single 10 uF bulk capacitor on the main VCC rail. The ATMEGA32A-MNR draws up to ~40 mA when active at 16 MHz; switch to Power-save mode (timer2 running from 32.768 kHz crystal) to drop quiescent current to a few microamps for battery-backed applications. Tie AVCC to VCC through an LC filter when ADC readings must reject digital noise.
Route the XTAL1/XTAL2 traces short and symmetric, with the crystal and load capacitors placed within 5 mm of the MCU. Keep ADC traces away from switching nodes such as relay coils or PWM outputs. The VQFN-44 thermal pad must be soldered to a ground copper pour to meet the -40 C to +105 C operating range; an unsoldered thermal pad can overheat the die under heavy GPIO toggling.
Do not leave the JTAG pins (PC2-PC5) floating if JTAG is disabled via fuses - configure them as GPIO with internal pull-ups to avoid spurious interrupts. When migrating firmware from ATmega32 (non-A) to ATmega32A-MNR, verify the OCDR register behavior because the on-chip debug logic differs between revisions. Always program the CKDIV8 fuse based on your application's clock plan to avoid unexpected 2 MHz boot operation.
The SPI bus on the ATMEGA32A-MNR can run up to f_osc/2, which is 8 MHz at 16 MHz CPU clock. Keep SPI traces under 50 mm and add 22-33 ohm series resistors near the driver to dampen reflections on longer runs. For TWI (I2C) buses, use 4.7 kB pull-ups at 100 kHz Standard mode and 1.8 kB at 400 kHz Fast mode; never leave SDA/SCL floating even if unused.
合规信息
RoHS compliant (Green) per Microchip product page; lead-free and halogen-free per VQFN-44 packaging materials. Not AEC-Q100 qualified - the ATmega32A family is positioned for industrial and consumer applications, not automotive under-hood or safety-critical use. REACH compliance verified per Microchip environmental documentation.
