ATMEGA324PA-AU - 32KB AVR MCU 20MHz TQFP-44 | Microchip
Référence : ATMEGA324PA-AU ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 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 Présentation
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.
Alternatives de remplacement direct pour ATMEGA324PA-AU — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ATMEGA324PA-AU (même facteur de forme et même empreinte) — différant par Package, ADC, Serial Interfaces, Timers, RoHS Status.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA324PB-AU
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATMEGA324A-AU
✅ Remplacement direct✓ En stock
$2.09 / unité
Voir la fiche technique →ATMEGA644PA-AU
✅ Remplacement direct✓ En stock
$4.61 / unité
Voir la fiche technique →ATMEGA164PA-AU
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$2.75 / unité
Voir la fiche technique →ATMEGA1284P-AU
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$4.65 / unité
Voir la fiche technique →ATMEGA324PA-AU Valeurs maximales et caractéristiques électriques
| Core Architecture | 8-bit AVR RISC |
| Flash Memory | 32 KB ISP Flash (16K x 16), read-while-write |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Fréquence d'horloge maximale | 20 MHz |
| Tension d'alimentation | 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 |
| Boîtier | 44-TQFP (10 x 10 mm, 0.8 mm pitch) |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
Guide de configuration des broches du ATMEGA324PA-AU 44-tqfp (10 x 10 mm, 0.8 mm pitch)
Configuration des broches du ATMEGA324PA-AU (boîtier 44-tqfp (10 x 10 mm, 0.8 mm pitch)). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour ATMEGA324PA-AU.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ATMEGA324PA-AU convient pour 6 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA324PA-AU — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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) |
Principaux différenciateurs
- picoPower low-power technology (vs ATMEGA324A-AU)
- Lower active current plus second SPI port (vs ATMEGA324PB-AU)
- Right-sized memory at lowest typical cost (vs ATMEGA1284P-AU)
Notes de conception
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.
Informations de conformité
RoHS compliance per Xecor comparison data ('compliant with the ROHS directive'). Other compliance attributes not stated in provided data.
