ATMEGA324PA-MN - 8-bit AVR MCU 32KB 20MHz QFN-44 | Microchip
料号： ATMEGA324PA-MN ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.33 | $4.33 |
| 10 | $3.98 | $39.80 |
| 100 | $3.65 | $365.00 |
| 500 | $3.35 | $1,675.00 |
| 1,000 | $3.05 | $3,050.00 |
ATMEGA324PA-MN 概述
Key differentiating specifications include the 131-instruction AVR RISC instruction set, 32 general-purpose working registers tightly coupled to the ALU, and the picoPower technology suite that keeps active and sleep currents low across the 1.8V to 5.5V supply range. The device integrates a rich peripheral set: an 8-channel 10-bit ADC, multiple timers with PWM, USI/USART serial interfaces, SPI, and two-wire interface (TWI/I2C). On-chip debug is available through the JTAG port, and code protection is provided by lock bits.
Performance is anchored by the single-cycle execution core; at 20 MHz the ATmega324PA delivers approximately 20 MIPS. The enhanced peripherals - including an 8/16-bit timer pair with output-compare PWM channels and a 10-bit successive-approximation ADC - allow the MCU to drive motor, lighting, and sensing tasks without external logic. The QFN-44 package with exposed thermal pad provides good thermal and electrical performance for compact industrial and automotive-adjacent designs rated to +105C.
Typical applications include industrial control panels, sensor nodes, consumer appliance user interfaces, motor control, and battery-powered instrumentation where low-power sleep modes and wide temperature operation matter. Designers should budget clock configuration carefully: full 20 MHz operation requires a 4.5V-5.5V supply, while lower voltages cap the maximum safe clock frequency. This page adds value beyond the datasheet by consolidating distributor pricing, drop-in same-package alternatives, comparison tables, and practical design notes in one structured reference.
直接替换替代料： ATMEGA324PA-MN ——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： ATMEGA324PA-MN （相同外形与封装尺寸） ——差异在于 Package, Flash Memory, General Purpose I/O, Instruction Set, Number of I/O.
快速对比工具——选择替代料号进行并排对比：
ATMEGA324PA-MCHR
✅ 直接替换✓ 有现货
$2.55 / 个
查看数据手册 →ATMEGA324PA-MCH
✅ 直接替换✓ 有现货
$2.45 / 个
查看数据手册 →ATMEGA324P-20MQ
✅ 直接替换✓ 有现货
$4.15 / 个
查看数据手册 →ATMEGA324PA-MN 最大额定值与电气特性
| Core Architecture | 8-bit AVR RISC |
| 最大时钟频率 | 20 MHz |
| Flash Memory | 32 KB (16K x 16) ISP |
| EEPROM | 1 KB |
| SRAM | 2 KB |
| General Purpose I/O | 32 lines |
| Supply Voltage Range | 1.8 V to 5.5 V |
| 工作温度 | -40C to +105C |
| 封装 | 44-VQFN (7x7 mm) Exposed Pad |
| 安装类型 | Surface Mount |
| ADC Resolution | 10-bit |
| Timers | 2 x 8-bit, 1 x 16-bit |
| Serial Interfaces | USART, SPI, TWI (I2C), USI |
| Low Power Technology | picoPower |
| RoHS 状态 | Compliant (Green per distributor data) |
| Max CPU Performance | Approx. 20 MIPS at 20 MHz |
ATMEGA324PA-MN 44-vqfn (7x7 mm) exposed pad 引脚配置指南
ATMEGA324PA-MN（44-vqfn (7x7 mm) exposed pad 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： ATMEGA324PA-MN.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATMEGA324PA-MN 适用于 6 应用s: Industrial Control and Automation, Battery-Powered Sensor Nodes, Consumer Appliance User Interfaces, Motor Control and PWM Drivers, Debug and Development Tooling, Lighting and Display Control.
Industrial Control and Automation
The ATMEGA324PA-MN fits industrial control panels and automation nodes because its -40C to +105C rating, 32 KB Flash, and 32 GPIO lines cover the temperature and I/O demands of factory-floor equipment. In a typical control node, the 10-bit ADC reads analog sensors while timers generate PWM for actuators, and the USART links to a master controller. Running at 20 MHz yields roughly 20 MIPS, sufficient for PID loops and protocol handling without an external co-processor. The QFN-44 exposed pad gives robust grounding against electrical noise common in industrial environments, and lock bits protect proprietary firmware on deployed units.
推荐
Battery-Powered Sensor Nodes
picoPower technology makes the ATMEGA324PA-MN well suited to battery-powered sensing: sleep modes shut down clocks and peripherals so the MCU spends most of its life in Power-down, waking on pin-change interrupt or watchdog timeout. Operating from 1.8V allows direct use of two alkaline cells or a single Li-SOCl2 cell without a boost converter, extending battery life and reducing BOM cost. The 10-bit ADC digitizes sensor outputs locally, and TWI/SPI interfaces connect digital sensors such as temperature, humidity, or pressure ICs. The 1 KB EEPROM stores calibration constants through power cycles, and 2 KB SRAM buffers data between radio or UART transmissions.
推荐
Consumer Appliance User Interfaces
Appliance front panels - washing machines, ovens, and HVAC thermostats - are a classic ATmega324-class application: the 32 GPIO lines drive seven-segment displays, LEDs, and read keypads, while the 20 MHz core handles debounce, display refresh, and menu logic concurrently. The -40C to +105C range accommodates heat near ovens and motor housings, exceeding the +85C limit of many consumer MCUs. USART and TWI communicate with power modules or main control boards, and the 1 KB EEPROM retains user settings after power loss. The compact 7x7 mm VQFN fits dense display PCBs where connector and display areas dominate board space.
推荐
Motor Control and PWM Drivers
The ATMEGA324PA-MN suits small motor control tasks: its 8-bit timers provide phase-correct and fast PWM outputs for DC and stepper motor drives, while the 16-bit timer offers precise control periods and input capture for encoder feedback. At 20 MIPS the core executes commutation and control-loop code with margin, and the 10-bit ADC samples current shunts or potentiometer position at regular intervals. Dead-time and protection logic are implemented in firmware with fast interrupt response. The +105C rating allows mounting near heat-generating drivers, and the exposed thermal pad helps conduct device heat into the PCB copper of compact drive boards.
推荐
Debug and Development Tooling
JTAG on-chip debug makes the ATMEGA324PA-MN convenient for development tooling, training boards, and test fixtures. Engineers can single-step code, watch registers, and set breakpoints through Atmel-ICE without consuming UART bandwidth, which is valuable when debugging protocol stacks or timing-critical loops. The 32 KB Flash supports read-while-write, so bootloader-based field updates on deployed instruments are straightforward. Educational and maker platforms frequently adopt this AVR class because the architecture is well documented, tools are free, and the 32-register file simplifies assembly-level teaching. The VQFN-44 package suits production test fixtures while TQFP siblings serve removable prototyping headers.
推荐
Lighting and Display Control
LED lighting controllers and display drivers benefit from the ATMEGA324PA-MN's PWM resources: multiple output-compare channels dim LED strings or drive backlight brightness with hardware-timed pulses, independent of software jitter. The 20 MHz clock allows fast multiplexing of LED matrix or seven-segment displays across the 32 I/O lines without external driver ICs in cost-sensitive products. The 10-bit ADC supports sensors for ambient-light adaptive dimming and over-temperature shutdown of luminaire electronics, leveraging the +105C rating. Sleep modes keep standby draw minimal in always-plugged products that must meet low no-load power targets.
推荐
推荐产品汇总
工程参考数据： ATMEGA324PA-MN ——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 | ATMEGA324PA-MCHR | ATMEGA324PA-MCH | ATMEGA324P-20MQ |
|---|---|---|---|---|
| Package | 44-VQFN (7x7 mm) | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash 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 Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Low Power Technology | picoPower (PA die) | picoPower (PA die) | picoPower (PA die) | Standard ATmega324P (higher sleep current) |
关键差异点
- picoPower die lowers standby current （对比 ATMEGA324P-20MQ)
- +105C operation exceeds typical consumer MCU limits （对比 ATMEGA324PA-MCH)
- VQFN-44 saves board area versus TQFP （对比 ATMEGA324PA-AU)
设计说明
Observe the clock-versus-voltage speed curve: 20 MHz operation is only specified at the high end of the 1.8V-5.5V supply range (per Microchip ATmega324PA family documentation, approximately 4.5V and above for full speed). If your system runs at 3.3V, derate the maximum crystal frequency accordingly or accept the documented derating curve. Decouple each VCC pin with 100 nF ceramics placed within a few millimeters of the pin, plus one bulk 4.7-10 uF capacitor per supply rail, to keep ADC noise and reset immunity within datasheet limits.
The VQFN-44 (7x7 mm) exposed pad on the MN package should be soldered to a grounded copper area - even though the pad is primarily thermal/ground, a well-wetted pad improves grounding and heat dissipation. Use an array of thermal vias under the pad to internal ground planes. QFN leads are hidden beneath the body, so define the PCB land pattern per the Microchip package drawing and verify paste aperture design to avoid bridging on the 0.5 mm pitch leads. Inspect with X-ray or angled AOI rather than relying on visual lead inspection.
Fuse configuration is the most common source of ATmega field failures: wrong clock-source or clock-divider fuses can leave the device dead-seeming or running at 1/8 speed, and disabling the RESET pin as GPIO (RSTDISBL) bricks in-circuit programming. Always verify SPI programming remains possible before locking debug fuses. Also confirm ISP header wiring shares a common ground with the target, and avoid driving JTAG pins during programming if JTAGEN is enabled, as contention corrupts programming sessions.
合规信息
Distributor data classifies ATMEGA324PA-MN as Green/RoHS compliant (FindIC: QFN, 105C, Green). AEC-Q100 qualification not stated in provided data; request Microchip qualification report for automotive programs.