ATMEGA324PA-MN - 8-bit AVR MCU 32KB 20MHz QFN-44 | Microchip
MPN： ATMEGA324PA-MN ✓ 啟用中ATMEGA324PA-MN 概覽
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.
直接替換替代品，適用於 ATMEGA324PA-MN — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ATMEGA324PA-MN （相同外形與佔位） — 差異在於 Package, Flash Memory, General Purpose I/O, Instruction Set, Number of I/O.
ATMEGA324PA-MCHR
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA324PA-MCH
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA324P-20MQ
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA324PA-MN 最大額定值與電氣特性
| Core Architecture | 8-bit AVR RISC |
| 最大時脈頻率 | 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 |
| 工作溫度 | -40C to +105C |
| 封裝 | 44-VQFN (7x7 mm) Exposed Pad |
| 安裝類型 | 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 狀態 | Compliant (Green per distributor data) |
| Max CPU Performance | Approx. 20 MIPS at 20 MHz |
ATMEGA324PA-MN 44-vqfn (7x7 mm) exposed pad 腳位配置指南
ATMEGA324PA-MN（44-vqfn (7x7 mm) exposed pad 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： ATMEGA324PA-MN.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATMEGA324PA-MN 適用於 6 應用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.
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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.
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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.
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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.
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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.
推薦
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.
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推薦產品摘要
工程參考資料，適用於 ATMEGA324PA-MN — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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) |
主要差異化特點
- picoPower die lowers standby current (對比ATMEGA324P-20MQ)
- +105C operation exceeds typical consumer MCU limits (對比ATMEGA324PA-MCH)
- VQFN-44 saves board area versus TQFP (對比ATMEGA324PA-AU)
設計說明
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.
合規資訊
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.