ATMEGA324PA-PU - 32KB AVR MCU 20MHz PDIP-40 | Microchip
部品番号: ATMEGA324PA-PU ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $5.45 | $5.45 |
| 10 | $4.9 | $49.00 |
| 100 | $4.36 | $436.00 |
| 500 | $3.92 | $1,960.00 |
| 1,000 | $3.55 | $3,550.00 |
ATMEGA324PA-PU 概要
An 8-bit AVR microcontroller is a single-chip computer that executes an entire program from internal Flash memory while handling digital and analog I/O, timing, and serial communication. Within the power-management hierarchy of embedded systems, it sits above discrete logic and below 32-bit application processors, and the AVR family is the classic Harvard-architecture 8-bit platform behind the original Arduino ecosystem.
Key features include 32 KB self-programmable Flash with read-while-write support, 131 mostly single-cycle RISC instructions, an on-chip 2-cycle hardware multiplier delivering up to 20 MIPS at 20 MHz, and picoPower low-power techniques for sleep currents in the microamp region. The three flexible timer/counters with compare modes and PWM, plus two USARTs, make it well suited for multi-protocol designs.
Architecturally, the device combines a fast AVR RISC CPU with 32 general purpose working registers, all directly connected to the ALU, allowing one instruction to execute per clock cycle. The Harvard bus design separates program and data memory, sustaining deterministic single-cycle execution that simplifies timing-critical firmware such as bit-banged protocols and software UARTs.
Typical applications include hobby and Arduino-compatible through-hole prototypes, industrial control panels, sensor nodes with analog front ends using the 10-bit ADC, and educational/lab trainer boards where the socketed DIP-40 package allows easy replacement and in-circuit programming.
For design, remember the 4.5 V to 5.5 V operating window of this speed grade and use decoupling capacitors close to VCC/AVCC; the JTAG and debugWIRE interfaces simplify bring-up. Flash endurance of 10,000 write cycles is ample for field firmware updates.
This page synthesizes distributor pricing, drop-in alternatives such as the ATMEGA32-16PU and ATMEGA1284-PU, pinout data, and practical design notes not consolidated in the manufacturer datasheet.
ドロップイン代替品: ATMEGA324PA-PU — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ATMEGA324PA-PU （同一形状・フットプリント） — 相違点: Package, EEPROM, SRAM, Serial Interfaces, ADC.
クイック比較ツール — 並列比較する代替部品を選択:
ATMEGA1284P-PU
✅ ドロップイン✓ 在庫あり
$6.05 / 個
データシートを見る →ATMEGA1284-PU
✅ ドロップイン✓ 在庫あり
$6.21 / 個
データシートを見る →ATMEGA32-16PU
✅ ドロップイン✓ 在庫あり
$3.68 / 個
データシートを見る →ATMEGA323-8PI
✅ ドロップイン✓ 在庫あり
$4.48 / 個
データシートを見る →ATMEGA324PA-PU 最大定格＆電気的特性
| Core Architecture | 8-bit AVR RISC |
| Flash Memory | 32 KB ISP Flash (read-while-write) |
| EEPROM | 1 KB |
| SRAM | 2 KB |
| Maximum Clock Speed | 20 MHz (up to 20 MIPS) |
| 電源電圧 | 4.5 V to 5.5 V (per listed specifications) |
| General Purpose I/O | 32 I/O lines (4 x 8-bit ports) |
| Working Registers | 32 x 8-bit |
| Instructions | 131 powerful instructions, most single-cycle |
| Timers/Counters | 3 flexible timer/counters with compare modes and PWM |
| Serial Interfaces | 2 x USART, 1 x Two-Wire (I2C-compatible), 1 x SPI |
| ADC | 8-channel 10-bit ADC |
| Real-Time Counter | Yes, with separate oscillator |
| Hardware Multiplier | On-chip 2-cycle multiplier |
| パッケージ | 40-pin PDIP (DIP-40), through-hole |
| 実装タイプ | Through Hole |
| Low Power Technology | picoPower |
| Life Cycle Stage | Active |
ATMEGA324PA-PU ピン構成
| ピン 1 | PA0 (ADC0) — Port A bit 0 / ADC channel 0 |
| ピン 2 | PA1 (ADC1) — Port A bit 1 / ADC channel 1 |
| ピン 3 | PA2 (ADC2) — Port A bit 2 / ADC channel 2 |
| ピン 4 | PA3 (ADC3) — Port A bit 3 / ADC channel 3 |
| ピン 5 | PA4 (ADC4) — Port A bit 4 / ADC channel 4 |
| ピン 6 | PA5 (ADC5) — Port A bit 5 / ADC channel 5 |
| ピン 7 | PA6 (ADC6) — Port A bit 6 / ADC channel 6 |
| ピン 8 | PA7 (ADC7) — Port A bit 7 / ADC channel 7 |
| ピン 9 | RESET — Reset input (active low) |
| ピン 10 | VCC — Digital supply voltage (4.5 V to 5.5 V) |
| ピン 11 | GND — Ground |
| ピン 12 | XTAL2 — Crystal oscillator output 2 |
| ピン 13 | XTAL1 — Crystal oscillator input 1 / external clock input |
| ピン 14 | PB0 (XCK/T0) — Port B bit 0 / USART external clock / Timer0 clock |
| ピン 15 | PB1 (T1) — Port B bit 1 / Timer1 external clock |
| ピン 16 | PB2 (AIN0/INT2) — Port B bit 2 / analog comparator input / external interrupt 2 |
| ピン 17 | PB3 (AIN1/OC0) — Port B bit 3 / comparator input / Timer0 output compare PWM |
| ピン 18 | PB4 (SS) — Port B bit 4 / SPI slave select |
| ピン 19 | PB5 (MOSI) — Port B bit 5 / SPI master data output |
| ピン 20 | PB6 (MISO) — Port B bit 6 / SPI master data input |
| ピン 21 | PB7 (SCK) — Port B bit 7 / SPI serial clock |
| ピン 22 | PD0 (RXD0) — Port D bit 0 / USART0 receive |
| ピン 23 | PD1 (TXD0) — Port D bit 1 / USART0 transmit |
| ピン 24 | PD2 (RXD1/INT0) — Port D bit 2 / USART1 receive / external interrupt 0 |
| ピン 25 | PD3 (TXD1/INT1) — Port D bit 3 / USART1 transmit / external interrupt 1 |
| ピン 26 | PD4 (OC1B) — Port D bit 4 / Timer1 output compare B PWM |
| ピン 27 | PD5 (OC1A) — Port D bit 5 / Timer1 output compare A PWM |
| ピン 28 | PD6 (ICP1) — Port D bit 6 / Timer1 input capture |
| ピン 29 | PD7 (OC2) — Port D bit 7 / Timer2 output compare PWM |
| ピン 30 | AVCC — ADC supply voltage (connect to VCC via low-pass filter) |
| ピン 31 | GND — Ground |
| ピン 32 | AREF — ADC reference voltage |
| ピン 33 | PC0 (SCL) — Port C bit 0 / Two-Wire serial clock |
| ピン 34 | PC1 (SDA) — Port C bit 1 / Two-Wire serial data |
| ピン 35 | PC2 (TCK) — Port C bit 2 / JTAG test clock |
| ピン 36 | PC3 (TMS) — Port C bit 3 / JTAG test mode select |
| ピン 37 | PC4 (TDO) — Port C bit 4 / JTAG test data output |
| ピン 38 | PC5 (TDI) — Port C bit 5 / JTAG test data input |
| ピン 39 | PC6 (TOSC1) — Port C bit 6 / RTC oscillator input |
| ピン 40 | PC7 (TOSC2) — Port C bit 7 / RTC oscillator output |
主な用途
ATMEGA324PA-PU の用途: 6 件s: Arduino-Compatible Through-Hole Prototyping, Industrial Control Panels, Analog Sensor Nodes, Educational and Lab Trainer Boards, Legacy Equipment Repair and Retrofit, Motor Control and PWM Actuation.
Arduino-Compatible Through-Hole Prototyping
The ATMEGA324PA-PU fits a standard DIP-40 socket, making it a favorite for Arduino-compatible boards built on perfboard or stripboard where the processor must be removable. The core delivers up to 20 MIPS at 20 MHz, and community Arduino cores support the ATmega324 family directly. Its 32 KB Flash accommodates bootloader plus application code, while 2 KB SRAM handles typical sketch workloads. Two USARTs allow a debug console and a peripheral link simultaneously, an upgrade over the single-UART ATmega328P used in the Uno. Because the DIP package can be pulled and reprogrammed in an external programmer, iteration is fast; in-system programming via the SPI MOSI/MISO/SCK pins (14-16) supports bootloaders without removal.
おすすめ
Industrial Control Panels
In industrial panels, the ATMEGA324PA-PU's 32 I/O lines let one MCU drive relays, read limit switches, and multiplex displays without port expanders. The 4.5-5.5 V supply matches legacy 5 V industrial logic, so it interfaces directly with 74HC-series circuits, optocouplers, and RS-485 transceivers through its two USARTs. The three timer/counters generate PWM for heater or motor control with hardware accuracy independent of firmware jitter. The 10-bit ADC, 8 channels deep, reads potentiometers and analog sensor conditioners directly. The 1 KB EEPROM stores setpoints and calibration data that survive power cycles with 100k-class endurance, and the watchdog plus brown-out facilities typical of AVR parts keep panel firmware recoverable after supply disturbances.
おすすめ
Analog Sensor Nodes
Sensor nodes benefit from the ATMEGA324PA-PU's integrated 8-channel 10-bit ADC: temperature, light, pressure, and potentiometer inputs can be sampled with no external converter. AVCC on pin 30 powers the ADC with a quiet supply, and AREF on pin 32 accepts an external reference for absolute accuracy. The picoPower construction of the PA variant reduces sleep-mode consumption, extending battery life between wakeups triggered by timer or external interrupts on INT0/INT1 (PORTD). With 2 KB SRAM the node can buffer sample bursts before transmitting over USART or the byte-oriented Two-Wire interface. Typical designs pair the MCU with an external radio or RS-485 link and log calibration constants into the 1 KB EEPROM.
おすすめ
Educational and Lab Trainer Boards
Universities and training labs choose the ATMEGA324PA-PU because the DIP-40 package survives repeated insertion into ZIF sockets and lets students observe and replace the processor physically. The 131-instruction AVR RISC set is compact enough for assembly-language courses, yet the C toolchain (AVR-GCC, Microchip Studio) supports progression to embedded C. Peripherals map cleanly to lab exercises: timers for frequency measurement, USARTs for PC communication, SPI and Two-Wire for interfacing EEPROMs and displays, and the ADC for analog labs. Because the part is an active Microchip product, teaching materials remain procurable year over year, and the same die exists in TQFP for students advancing to surface-mount assembly practice.
おすすめ
Legacy Equipment Repair and Retrofit
The DIP-40 ATMEGA324PA-PU is a practical retrofit processor for equipment originally designed around 40-pin AVR devices such as the ATmega32 or ATmega323, whose sockets it physically matches. Its 4.5-5.5 V operation suits older 5 V rails, and 20 MHz operation restores or exceeds original timing headroom. Engineers re-flashing replacement boards appreciate 32 KB Flash for re-implemented firmware plus the second USART when the retrofit adds modern connectivity. When the original firmware exceeds 32 KB, the pin-identical ATMEGA1284P-PU drops into the same socket with 128 KB Flash. Care is needed: register maps of ATmega32-era parts differ, so firmware must be recompiled and peripheral mappings verified before the swap.
おすすめ
Motor Control and PWM Actuation
Three timer/counters with compare modes and PWM outputs let the ATMEGA324PA-PU drive servo, DC motor, and heater channels from hardware, offloading the CPU. Pin 18 (PB3/OC0) and PORTD compare outputs provide multiple independent PWM sources suitable for controlling external H-bridges or MOSFET drivers at 5 V logic levels. The 2-cycle hardware multiplier supports PID fixed-point math at up to 20 MIPS, so closed-loop control loops run comfortably even with ADC sampling and USART telemetry active. External interrupts INT0/INT1 capture encoder edges for speed feedback, while the input-capture unit timestamps events precisely. Combined with the ADC for current and position feedback, a complete multi-axis actuation controller fits in one DIP-40 device.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ATMEGA324PA-PU — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ATMEGA1284P-PU | ATMEGA1284-PU | ATMEGA32-16PU | ATMEGA323-8PI |
|---|---|---|---|---|---|
| Package | PDIP-40 (through-hole) | PDIP-40 - same footprint | PDIP-40 - same footprint | PDIP-40 - same footprint | PDIP-40 - same footprint |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB ISP Flash | 128 KB | 128 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 16 KB | 16 KB | 2 KB | 1 KB |
| EEPROM | 1 KB | 4 KB | 4 KB | 1 KB | 512 B |
| Maximum Clock Speed | 20 MHz (20 MIPS) | 20 MHz | 16 MHz | 16 MHz | 8 MHz |
| USART Count | 2 | 2 | 2 | 1 | 1 |
| ADC | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit |
主な差別化要因
- Higher clock headroom in same socket （vs ATMEGA32-16PU)
- Lower-cost memory-right-sized option （vs ATMEGA1284P-PU)
- Modern picoPower silicon vs legacy core （vs ATMEGA323-8PI)
設計ノート
Supply the ATMEGA324PA-PU from a clean 5 V rail within its listed 4.5 V to 5.5 V window. Place 100 nF ceramic decoupling capacitors directly at VCC (pin 10) and AVCC (pin 30), plus a 10 uF bulk capacitor near the socket. AVCC must never lag VCC at power-up; a series 10 ohm resistor plus 100 nF from AVCC to ground forms a simple low-pass filter that measurably improves ADC noise on sensor designs. Keep the 5 V rail within tolerance even at 20 MHz operation, where timing margin against underspec supply is smallest.
For through-hole layouts, keep the crystal (or ceramic resonator) within 15-20 mm of XTAL1 (pin 13) and XTAL2 (pin 12) and route the oscillator traces as short, direct runs with a ground return path; long oscillator traces pick up digital switching noise and can cause startup failures. Pull RESET (pin 9) up with 10 kohm to VCC; do not rely on the programmer's pull-up alone if external circuitry can clamp the pin during power-up. Route ADC traces (PORTA, pins 1-8) away from SPI and USART clock lines.
JTAG is enabled by default on PORTC (pins 35-38), which silently disables PC2-PC5 as general purpose I/O - a classic bring-up trap. Clear the JTAGEN fuse if you need those pins, remembering that repeated fuse-write operations can also re-enable it. Additionally, migration from ATmega32/ATmega323 firmware requires register-map rework: timer PWM locations and USART register sets differ between families. Verify EEPROM endurance assumptions (1 KB on this part vs 512 B on ATmega32) before reusing bootloader-style data logging.
コンプライアンス情報
The retrieved web data did not include explicit RoHS/REACH/lead-free status for ATMEGA324PA-PU. Consult the Microchip product page environmental data sheet for certified compliance values.
