ATMEGA324PA-AU - 32KB AVR MCU 20MHz TQFP-44 | Microchip
料号： ATMEGA324PA-AU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.62 | $4.62 |
| 10 | $4.16 | $41.60 |
| 100 | $3.63 | $363.00 |
| 500 | $3.21 | $1,605.00 |
| 1,000 | $2.87 | $2,870.00 |
ATMEGA324PA-AU 概述
An 8-bit AVR microcontroller is a single-chip processor that integrates a Harvard-architecture RISC CPU, program Flash, data SRAM, EEPROM, and peripherals on one die. It sits within the broader hierarchy: MCU -> embedded processor -> integrated circuit, and belongs to the ATmega family used throughout the embedded systems industry. Executing most of its 131 instructions in a single clock cycle, the AVR core achieves throughput approaching 1 MIPS per MHz, letting designers trade clock speed directly against power consumption.
Key features include the picoPower low-power technology suite, read-while-write Flash for in-system programming, three flexible timer/counters with compare modes and PWM, two USARTs, a byte-oriented 2-wire serial interface (TWI/I2C), and an 8-channel 10-bit ADC. The 5 V supply range (4.5 V to 5.5 V per the Atmel/Microchip datasheet listing) makes it robust in electrically noisy industrial environments.
Architecturally, the device pairs the AVR enhanced RISC core with 32 general-purpose working registers directly connected to the ALU, so a rich instruction set executes in one clock per instruction for most opcodes. In-system programmable Flash with read-while-write support allows firmware updates over SPI or UART bootloaders without removing the chip from the board.
Typical applications include industrial automation controllers, sensor nodes and instrumentation, LED lighting and motor-control boards, and hobbyist/embedded products that benefit from the huge ATmega ecosystem of Arduino-compatible tools, compilers, and programmers.
For design, keep clock speed as low as the application allows to exploit picoPower sleep modes, and use 100 nF decoupling on each supply pin. Confirm brown-out and supply tolerance at 5 V operation for reliability.
This page synthesizes verified distributor data, drop-in alternatives, design notes, and SEO-structured technical content not found on the manufacturer product page alone.
直接替换替代料： ATMEGA324PA-AU ——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-AU （相同外形与封装尺寸） ——差异在于 Package, ADC, Serial Interfaces, Timers, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
ATMEGA324PB-AU
✅ 直接替换📋 参考替代料（不在目录中）
ATMEGA324A-AU
✅ 直接替换✓ 有现货
$2.09 / 个
查看数据手册 →ATMEGA644PA-AU
✅ 直接替换✓ 有现货
$4.61 / 个
查看数据手册 →ATMEGA164PA-AU
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.75 / 个
查看数据手册 →ATMEGA1284P-AU
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$4.65 / 个
查看数据手册 →ATMEGA324PA-AU 最大额定值与电气特性
| Core Architecture | 8-bit AVR RISC |
| Flash Memory | 32 KB ISP Flash (16K x 16), read-while-write |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| 最大时钟频率 | 20 MHz |
| 电源电压 | 4.5 V to 5.5 V |
| I/O Lines | 32 |
| Working Registers | 32 general purpose |
| Instructions | 131 powerful instructions, most single-cycle |
| Timers/Counters | 3 with compare modes and PWM |
| Serial Interfaces | 2 USART, TWI (I2C), SPI |
| ADC | 8-channel 10-bit |
| Low-Power Technology | picoPower |
| 封装 | 44-TQFP (10 x 10 mm, 0.8 mm pitch) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
ATMEGA324PA-AU 44-tqfp (10 x 10 mm, 0.8 mm pitch) 引脚配置指南
ATMEGA324PA-AU（44-tqfp (10 x 10 mm, 0.8 mm pitch) 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-AU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATMEGA324PA-AU 适用于 6 应用s: Industrial Automation Controllers, Sensor Nodes and Instrumentation, LED Lighting and Dimming Control, Hobbyist and Educational Embedded Projects, Motor Control and PWM Drive Systems, Communication Gateways and Serial Bridges.
Industrial Automation Controllers
The ATMEGA324PA-AU suits industrial control nodes because its 4.5 V to 5.5 V supply range matches legacy 24 V-panel-derived 5 V rails with superior noise margin over 3.3 V MCUs. Three timers with compare modes and PWM drive actuators and motor drivers directly, while two hardware USARTs isolate operator panels from sensor networks. The 32 GPIO lines reduce external I/O expansion in relay and valve control boards, and the 10-bit ADC reads potentiometers and current shunts. Running at 16-20 MHz delivers roughly 16-20 MIPS from a single-cycle RISC core, sufficient for sequential control logic, while picoPower sleep modes cut standby draw in periodically woken nodes.
推荐
Sensor Nodes and Instrumentation
For measurement front-ends, the ATMEGA324PA-AU's 8-channel 10-bit ADC digitizes multiple sensors such as thermistors, pressure bridges, and potentiometer dividers without an external converter. The TWI (I2C) master interface reads digital sensors like the AT30TS temperature family, while the SPI port services high-speed data converters or flash logging. PicoPower technology supports extended sleep duty cycles in battery-powered loggers, waking on USART or timer interrupts. With 2 KB SRAM and 1 KB EEPROM, the part stores calibration constants and buffering windows locally, and the read-while-write Flash allows field firmware updates over a UART bootloader without removing the MCU from the deployed instrument board.
推荐
LED Lighting and Dimming Control
Lighting controllers benefit from the ATMEGA324PA-AU's three timers whose compare outputs generate hardware PWM channels, guaranteeing flicker-free dimming without CPU intervention even at 20 MHz operation. The 5 V supply tolerates the electrical noise that switching LED drivers inject into shared rails, and the 10-bit ADC monitors current and temperature feedback for closed-loop brightness regulation. With 32 I/O lines the MCU can drive several PWM channels plus addressable-LED serial timing via the SPI port, while USARTs accept DMX-style or RS-485 control signals in stage and architectural lighting. The 1 KB EEPROM persists scene presets and address settings across power cycles without external memory.
推荐
Hobbyist and Educational Embedded Projects
The ATMEGA324PA-AU is popular in maker and education contexts because it uses the same AVR instruction set and toolchain as the classic Arduino family, running with AVR-GCC, Microchip Studio, or Arduino-compatible cores and standard ISP programmers. The 44-pin TQFP offers far more I/O (32 lines) and memory headroom (32 KB Flash, 2 KB SRAM) than the 28-pin ATmega328P, enabling robotics shields, retro-computing replicas, and multi-peripheral projects on one chip. DIP-adapter breakout boards simplify hand soldering, and two USARTs permit simultaneous USB-serial debugging and device communication. Its 20 MHz rating at 5 V gives full-speed operation from common bench supplies and breadboard-friendly voltage levels.
推荐
Motor Control and PWM Drive Systems
DC and stepper motor control exploits the ATMEGA324PA-AU's hardware PWM channels generated by its three timer/counter blocks, offloading waveform generation from software and freeing the 20 MIPS RISC core for closed-loop control math. Encoder quadrature inputs feed interrupt-capable GPIO and the 10-bit ADC samples back-EMF or shunt current for speed regulation. The two USARTs integrate with higher-level field controllers over RS-485, and 5 V operation drives MOSFET gate logic directly without level shifters, simplifying half-bridge driver design. PicoPower idle modes keep the MCU responsive between control-loop interrupts, and 1 KB EEPROM stores tuning parameters such as PID constants across power-down.
推荐
Communication Gateways and Serial Bridges
With two independent hardware USARTs, a byte-oriented TWI master/slave, and an SPI port, the ATMEGA324PA-AU natively bridges three serial domains on one chip - for example converting Modbus RTU on RS-485 to I2C-attached peripherals, or forwarding UART telemetry to an SPI flash logger. The read-while-write Flash permits storing received data blocks while firmware continues executing, and the 32 KB program space hosts protocol stacks with room to spare. Hardware buffer depth reduces interrupt latency at 20 MHz, supporting sustained multi-kbps links. The 5 V I/O directly drives legacy RS-232 transceivers and optocoupled industrial lines, making it a compact gateway fit for brownfield installations.
推荐
推荐产品汇总
工程参考数据： ATMEGA324PA-AU ——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 | ATMEGA324PB-AU | ATMEGA324A-AU | ATMEGA644PA-AU | ATMEGA164PA-AU | ATMEGA1284P-AU |
|---|---|---|---|---|---|---|
| Package | 44-TQFP (10x10 mm, 0.8 mm pitch) | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 32 KB | 32 KB | 64 KB | 16 KB | 128 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 4 KB | 1 KB | 16 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 2 KB | 512 B | 4 KB |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Low-Power Technology | picoPower | picoPower (improved) | No (standard) | picoPower | picoPower | picoPower |
| Extra Peripherals vs 324PA | Baseline (2 USART, 1 SPI, TWI) | Extra timers + second SPI | None (equivalent) | None (memory-only gain) | None (memory reduced) | None (memory-only gain) |
关键差异点
- picoPower low-power technology （对比 ATMEGA324A-AU)
- Lower active current plus second SPI port （对比 ATMEGA324PB-AU)
- Right-sized memory at lowest typical cost （对比 ATMEGA1284P-AU)
设计说明
Run the ATMEGA324PA-AU from a clean 5 V rail (datasheet range 4.5 V to 5.5 V) with 100 nF ceramic decoupling on every VCC/AVCC pin pair placed within 5 mm of the pins. Enable the internal brown-out detector (BOD) at 4.3 V so Flash and EEPROM writes are not corrupted during supply sag. If AVCC powers the ADC, filter it through an LC or RC network (10 uH / 100 nF) to keep ADC noise below the 10-bit LSB floor, and tie AREF to a decoupled reference rather than the raw rail for precision measurements.
The 44-TQFP uses 0.8 mm pitch, which is comfortably hand-assemblable and routes 0.15 mm traces between pads on a two-layer PCB. Place the crystal within 10 mm of XTAL1/XTAL2 with short return traces to ground; load capacitors of 12-22 pF (per the crystal datasheet) stabilize the 20 MHz oscillator. Expose a ground plane under the package and stitch it with vias near each GND pin. Keep reset traces short and add a 10 k pull-up plus optional 100 nF to GND for robust in-circuit programming with SPI programmers.
Do not run the 20 MHz rating below 4.5 V - check the datasheet frequency-versus-voltage curve before undervolting for power savings, as overclocked low-voltage operation causes marginal timing. Programmers must match fuse settings: setting SPIEN off or locking lockbits without a bootloader can brick access until a parallel high-voltage programmer is used. Also verify RESET pin fuse choice (external pull-up required when RESET is disabled). Migrating to ATMEGA324PB-AU requires re-checking register addresses for the added timers, though core peripherals remain compatible.
合规信息
RoHS compliance per Xecor comparison data ('compliant with the ROHS directive'). Other compliance attributes not stated in provided data.
