ATMEGA324PA-MNR - 8-bit AVR MCU 20MHz 32KB Flash | Microchip
MPN: ATMEGA324PA-MNR ✓ فعالATMEGA324PA-MNR نمای کلی
A microcontroller of this class integrates a processor core, program memory, data memory, and peripherals such as UART/USART, SPI, I2C (TWI), an ADC, and timers onto a single chip. Within the embedded systems hierarchy, the ATmega324PA sits in the 8-bit general-purpose MCU family, positioned below 32-bit ARM-based devices and above small 8-pin AVR parts, making it a mid-range workhorse for cost- and power-sensitive designs.
Key features include the picoPower technology for ultra-low sleep-mode consumption, read-while-write Flash operation for in-system self-programming, 1 KB of EEPROM for non-volatile parameter storage, and 32 general-purpose I/O lines with internal pull-ups. The enhanced RISC core with 32 general-purpose working registers enables efficient C-compiled code execution.
Architecturally, the ATmega324PA uses a Harvard structure with separate program and data buses. On-chip features include power-on reset, programmable brown-out detection, an internal calibrated RC oscillator, and multiple sleep modes including idle, power-save, power-down, and standby, allowing the designer to trade processing speed against current consumption. According to the ATmega324PA datasheet published by Microchip (Atmel), the device family spans 128 KB Flash maximum with up to 16 KB SRAM across 40/44-pin variants.
Typical applications include industrial sensor nodes and automation controllers, consumer appliances and HVAC controls, and battery-powered portable instruments where the picoPower sleep modes extend battery life. Its dual USARTs, SPI, and TWI interfaces also suit communication gateways and human-machine interface boards.
A key design consideration: operate within the 105C maximum ambient rating noted by distributors, and plan for the VQFN exposed pad providing a solid ground connection on the PCB.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet alone.
جایگزین‌های drop-in برای ATMEGA324PA-MNR — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای ATMEGA324PA-MNR (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Package, Flash Memory, Packaging, EEPROM, Number of I/O.
ATMEGA324PB-MU
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATMEGA324PB-MNR
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
ATMEGA324PA-MCHR
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATMEGA164PA-MNR
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATMEGA644PA-MNR
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATMEGA1284P-MNR
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشده📋 جایگزین مرجع (خارج از کاتالوگ)
ATMEGA324PA-MNR حداکثر مقادیر مجاز و مشخصات الکتریکی
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 20 MHz |
| Flash Memory | 32 KB (16K x 16) |
| EEPROM | 1 KB |
| SRAM | 2 KB |
| GPIO Count | 32 |
| Connectivity | I2C, SPI, UART/USART |
| ولتاژ تغذیه | 5 V (nominal per Mouser listing) |
| دمای کاری | -40C to +105C |
| بسته‌بندی | 44-VQFN (7x7 mm) with exposed pad |
| نوع نصب | Surface Mount |
| Packaging | Tape & Reel (T&R) |
| Technology | picoPower low-power CMOS |
| Program Memory Type | ISP FLASH with read-while-write |
| وضعیت RoHS | Green (RoHS compliant per Mouser listing) |
راهنمای پیکربندی پین ATMEGA324PA-MNR 44-vqfn (7x7 mm) with exposed pad
پیکربندی پین برای ATMEGA324PA-MNR (پکیج 44-vqfn (7x7 mm) with exposed pad). این IC دیجیتال شامل GPIO، رابط‌های ارتباطی (UART، SPI، I2C) و پین‌های تغذیه است. برای عملکردهای جایگزین پین و گزینه‌های پیکربندی به دیتاشیت سازنده مراجعه کنید. ضروری برای طراحی سیستم‌های نهفته و چیدمان PCB.
داده پین‌آوت تفصیلی موجود نیست برای ATMEGA324PA-MNR.
به دیتاشیت برای پیکربندی کامل پین‌ها.
کاربردهای معمول
ATMEGA324PA-MNR مناسب است برای 6 کاربردs: Industrial Sensor Nodes and Automation, Battery-Powered Portable Instruments, Consumer Appliances and HVAC Control, Communication Gateways and Protocol Bridges, Human-Machine Interface Boards, Hobby, Education, and Legacy AVR Designs.
Industrial Sensor Nodes and Automation
The ATMEGA324PA-MNR fits industrial sensing and control nodes because it combines 32 KB Flash, 2 KB SRAM, and a -40C to +105C temperature rating, covering both cold warehouses and hot panel enclosures. Its I2C, SPI, and UART/USART interfaces connect directly to ADCs, EEPROMs, and Modbus-style RS-485 links via external transceivers. In a typical node the MCU reads sensors over TWI, executes filtering in the 2 KB SRAM, and reports over USART while sleeping in picoPower power-down mode between samples to save energy. The 20 MHz core delivers roughly 20 MIPS of effective throughput for control loops, and 1 KB EEPROM stores calibration data through power cycles. The VQFN exposed pad provides a robust ground reference for noisy factory floors.
پیشنهادی
Battery-Powered Portable Instruments
For handheld meters, dataloggers, and portable test tools, the ATMEGA324PA-MNR's picoPower technology is the decisive parameter: power-down and power-save sleep modes keep RAM alive at microamp-class currents, while wake-up interrupts return to full-speed 20 MHz operation only when needed. Executing instructions in a single cycle at ~1 MIPS per MHz means measurement routines complete quickly, so the duty cycle stays sleep-dominated and battery life is maximized. The 32 GPIO lines drive an LCD segment driver or keypad matrix, and the ADC front end digitizes sensor channels, while the 1 KB EEPROM preserves user settings and calibration constants across battery swaps. Designers should budget wake-up latency of the selected sleep mode in timing-critical sampling loops.
پیشنهادی
Consumer Appliances and HVAC Control
White goods, thermostats, and fan controllers benefit from the ATMEGA324PA-MNR's balance of cost, memory, and robustness. The 105C ambient rating supports control boards mounted near motors or heating elements, and the internal calibrated RC oscillator eliminates an external crystal in cost-driven designs where timing precision permits. Typical firmware uses timers for phase-control or PWM outputs to drive triacs and fan circuits, TWI to read temperature and humidity sensors, and a USART for factory diagnostics. With 32 KB Flash there is headroom for communication stacks and fault-logging routines, while 2 KB SRAM holds state machines and look-up tables. Brown-out detection protects EEPROM writes and program flow during mains dips.
پیشنهادی
Communication Gateways and Protocol Bridges
The ATMEGA324PA-MNR serves as an economical protocol bridge because its dual USART/UART capability, SPI, and I2C (TWI) allow it to interconnect serial field devices with system buses. A common topology routes RS-485 traffic on one USART to a display or host on the second, while SPI handles external Flash buffering and TWI manages configuration EEPROMs or RTCs. The 20 MHz AVR core sustains throughput near 20 MIPS, sufficient for framing, CRC checking, and store-and-forward buffering within 2 KB SRAM when packet sizes are bounded. Because throughput scales linearly with clock per the single-cycle RISC architecture, designers can trade speed grade against power budget in mains-powered gateway hardware.
پیشنهادی
Human-Machine Interface Boards
Key panels, small displays, and controller front-ends use the ATMEGA324PA-MNR's 32 GPIO lines to scan button matrices, drive LED indicators, and communicate with serial character LCDs or OLED controllers. With 32 KB Flash there is space for multi-language string tables and menu frameworks, while the 1 KB EEPROM retains user preferences without external memory. The internal RC oscillator plus software-debounced interrupts handles touch-style inputs without a crystal, reducing BOM cost. Interfaces to the main controller are handled over TWI in slave mode or a USART, keeping the HMI electrically isolated from the power section. The 7x7 mm VQFN suits compact bezel-mounted PCBs, and the exposed pad aids EMI performance in electrically noisy enclosures.
پیشنهادی
Hobby, Education, and Legacy AVR Designs
The ATmega324PA remains popular for educational platforms and legacy AVR designs because it shares the well-documented AVR instruction set and toolchain (AVR-GCC, MPLAB X, AVRISP/UPDI-class programmers for ISP) with the wider ATmega family. Its 32 KB Flash and dual UARTs exceed the classic ATmega328 resources, enabling course projects with richer peripherals while retaining the same free toolchain and the shared ATmega164A/PA/324A/PA/644A/PA/1284/P datasheet. University labs and makers use the 44-VQFN on adapter boards to teach surface-mount assembly, and maintainers of shipped AVR products source the PA as a drop-in continuation of existing firmware images compiled years ago, minimizing requalification risk.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای ATMEGA324PA-MNR — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | ATMEGA324PB-MU | ATMEGA324PB-MNR | ATMEGA324PA-MCHR | ATMEGA644PA-MNR | ATMEGA1284P-MNR |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-VQFN (7x7 mm) | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same |
| Core / Speed | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 64 KB | 128 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 4 KB | 16 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 4 KB | 4 KB |
| GPIO Count | 32 | 32 | 32 | 32 | 32 | 32 |
| USART Count | 2 (UART/USART) | 3 | 3 | 2 | 2 | 2 |
| Temperature Range | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +85C | -40C to +85C |
تفاوت‌های کلیدی
- picoPower low-power technology (در مقابلATMEGA324PB-MU)
- Higher temperature ceiling within drop-in options (در مقابلATMEGA644PA-MNR)
- Cost-effective 32 KB Flash midpoint (در مقابلATMEGA1284P-MNR)
- Fewer peripherals can mean simpler qualification (در مقابلATMEGA324PB-MU)
یادداشت‌های طراحی
The 44-VQFN 7x7 mm package has a central exposed pad that must be soldered to a grounded thermal land pattern. Follow the Microchip VQFN land-pattern recommendation in the datasheet package section: array of thermal vias under the pad connected to the ground plane for reliable solder joint inspection and EMI performance. Use no-clean flux profiles compatible with via-in-pad or ensure vacuum-assisted reflow to void out under the large pad. Pin 1 is identified by the dot marker on the package top.
Decouple every VCC pin with 100 nF ceramic capacitors placed within a few millimeters of the pins, plus one bulk 10 uF capacitor near the supply entry. The internal regulator oscillator start-up and brown-out detector require a stable supply; if using the programmable BOD, select a trip level consistent with your 5 V rail tolerance. When operating at 20 MHz near +105C ambient, verify the VCC-versus-frequency safe operating region in the datasheet before committing to the maximum clock grade.
Three common ATmega324PA pitfalls: (1) leaving RESET floating in noisy environments - enable the internal pull-up and add a 10 k external pull-up plus optional 100 nF to ground for robust reset behavior; (2) assuming the internal 8 MHz RC oscillator accuracy suffices for UART - calibrate or use an external crystal when baud rates exceed modest error budgets; (3) EEPROM corruption during brown-out - always enable BOD and follow the EEPROM write sequence in the datasheet. When migrating to ATMEGA324PB, re-verify register maps since peripheral instances increased.
Estimated: at 5 V and a typical active current of a few mA, self-heating of the VQFN-44 is low (tens of mW), so the package is rarely thermally limiting. The dominant thermal constraint is ambient: the part is rated to +105C, so in sealed enclosures verify that local air temperature near the MCU stays below the rating including heat from nearby power components such as regulators or motor drivers. Grounded exposed pad and thermal vias improve heat spreading to the PCB.
اطلاعات انطباق
Listed as a Green (RoHS) part per Mouser listing. REACH, halogen-free, and conflict-minerals status not stated in retrieved data - verify on Microchip compliance portal.