ATMEGA644P-A15AZ - 64KB Flash 16MHz 5V AVR MCU | Microchip
MPN: ATMEGA644P-A15AZ ✗ انتهى عمره الإنتاجيATMEGA644P-A15AZ نظرة عامة
An 8-bit microcontroller is a single-chip computer whose data bus, ALU, and registers operate on 8-bit words. In the system hierarchy it belongs to the embedded processor family: microcontroller -> embedded MCU -> semiconductor IC. Microcontrollers such as the ATMEGA644P-A15AZ integrate CPU, program memory, data memory, peripherals (USART, SPI, I2C/TWI, timers, ADC), and I/O ports on a single die, replacing multi-chip processor boards in cost- and power-sensitive designs. The AVR architecture executes most instructions in a single clock cycle, delivering throughput approaching 1 MIPS per MHz.
Key features of the ATMEGA644P-A15AZ include 64KB of self-programmable Flash memory, 4KB of internal SRAM, 2KB of EEPROM for non-volatile data storage, and 53 general-purpose I/O lines across four 8-bit ports. The picoPower 'P' suffix denotes low-power AVR core operation, and the device provides two USARTs for serial communication. The integrated 10-bit ADC supports up to 8 channels, and six PWM channels support motor and lighting control.
Technically, the AVR enhanced RISC core combines a rich instruction set with 32 general-purpose working registers, all directly connected to the ALU, allowing two independent registers to be accessed in one instruction executed in one clock cycle. The A15AZ speed-grade marking is characterized at 5V and 16 MHz across the -40C to +85C (or +105C) automotive temperature range, satisfying AEC-Q100 stress-test requirements as evidenced by the 'AZ' suffix and the automotive qualification trail documented on the Microchip product page.
Typical applications include industrial control and automation nodes, embedded instrumentation and data loggers, automotive body and chassis subsystems, and consumer appliance control boards, where the 5V-tolerant I/O and 53 I/O lines simplify direct connection to sensors, keypads, displays, and actuators without level shifting.
Design consideration: the ATMEGA644P-A15AZ is specified for a 4.5V to 5.5V supply; designs targeting 3.3V operation must instead select the picoPower ATMEGA644PA family or a low-voltage variant, since this A15AZ speed-grade part is characterized at 5V and 16 MHz. Microchip lists the ATmega644P family as a mature product, not recommended for new designs, replaced by the ATmega644PA.
This page synthesizes distributor stock and pricing signals, drop-in alternative cross-references from verified web data, and practical design guidance not found in the manufacturer datasheet alone, providing engineers a single decision-ready resource.
بدائل مباشرة لـ ATMEGA644P-A15AZ — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع ATMEGA644P-A15AZ (نفس عامل الشكل والبصمة) — يختلف في EEPROM, Operating Temperature, Package, SRAM, Program Memory (Flash).
ATMEGA644P-15AT1
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ATMEGA644PA-AU
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ATMEGA644P-20PU
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ATMEGA324PV-10AU
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ATMEGA644P-A15AZ الحدود القصوى والخصائص الكهربائية
| Core Architecture | AVR enhanced RISC 8-bit |
| Program Memory (Flash) | 64 KB |
| SRAM | 4 KB |
| EEPROM | 2 KB |
| Maximum Clock Speed | 16 MHz |
| Supply Voltage (Vcc) | 4.5 V to 5.5 V |
| General-Purpose I/O Pins | 53 |
| ADC | 10-bit, 8 channels |
| USART | 2 |
| SPI | 1 |
| TWI (I2C) | 1 |
| PWM Channels | 6 |
| Timers/Counters | 2x 8-bit + 1x 16-bit |
| درجة حرارة التشغيل | -40 C to +85 C (industrial) / -40 C to +105 C (automotive grade) |
| العلبة | 44-pin TQFP (10x10 mm) |
| نوع التركيب | Surface Mount |
| Automotive Qualification | AEC-Q100 (per AZ speed-grade suffix) |
| حالة RoHS | Compliant |
تكوين أطراف ATMEGA644P-A15AZ
| دبوس 1 | PB5 (MOSI) — Port B bit 5 / SPI MOSI |
| دبوس 2 | PB6 (MISO) — Port B bit 6 / SPI MISO |
| دبوس 3 | PB7 (SCK) — Port B bit 7 / SPI SCK |
| دبوس 4 | RESET — Reset input, active low |
| دبوس 5 | VCC — Digital supply voltage |
| دبوس 6 | GND — Digital ground |
| دبوس 7 | XTAL2 — Crystal oscillator pin 2 |
| دبوس 8 | XTAL1 — Crystal oscillator pin 1 |
| دبوس 9 | PD0 (RXD0) — Port D bit 0 / USART0 RXD |
| دبوس 10 | PD1 (TXD0) — Port D bit 1 / USART0 TXD |
| دبوس 11 | PD2 (INT0) — Port D bit 2 / External INT0 |
| دبوس 12 | PD3 (INT1) — Port D bit 3 / External INT1 |
| دبوس 13 | PD4 (OC1B) — Port D bit 4 / Timer1 output compare B |
| دبوس 14 | PD5 (OC1A) — Port D bit 5 / Timer1 output compare A |
| دبوس 15 | PD6 (ICP1) — Port D bit 6 / Timer1 input capture |
| دبوس 16 | PD7 (OC2) — Port D bit 7 / Timer2 output compare |
| دبوس 17 | VCC — Digital supply voltage |
| دبوس 18 | GND — Digital ground |
| دبوس 19 | PC0 (SCL) — Port C bit 0 / TWI SCL |
| دبوس 20 | PC1 (SDA) — Port C bit 1 / TWI SDA |
| دبوس 21 | PC2 (TCK) — Port C bit 2 / JTAG TCK |
| دبوس 22 | PC3 (TMS) — Port C bit 3 / JTAG TMS |
| دبوس 23 | PC4 (TDO) — Port C bit 4 / JTAG TDO |
| دبوس 24 | PC5 (TDI) — Port C bit 5 / JTAG TDI |
| دبوس 25 | PC6 (TOSC1) — Port C bit 6 / Timer0 oscillator |
| دبوس 26 | PC7 (TOSC2) — Port C bit 7 / Timer0 oscillator |
| دبوس 27 | AVCC — Analog supply voltage |
| دبوس 28 | AREF — ADC reference voltage |
| دبوس 29 | AGND — Analog ground |
| دبوس 30 | PA7 (ADC7) — Port A bit 7 / ADC input channel 7 |
| دبوس 31 | PA6 (ADC6) — Port A bit 6 / ADC input channel 6 |
| دبوس 32 | PA5 (ADC5) — Port A bit 5 / ADC input channel 5 |
| دبوس 33 | PA4 (ADC4) — Port A bit 4 / ADC input channel 4 |
| دبوس 34 | PA3 (ADC3) — Port A bit 3 / ADC input channel 3 |
| دبوس 35 | PA2 (ADC2) — Port A bit 2 / ADC input channel 2 |
| دبوس 36 | PA1 (ADC1) — Port A bit 1 / ADC input channel 1 |
| دبوس 37 | PA0 (ADC0) — Port A bit 0 / ADC input channel 0 |
| دبوس 38 | VCC — Digital supply voltage |
| دبوس 39 | GND — Digital ground |
| دبوس 40 | PB0 (XCK0) — Port B bit 0 / USART0 clock |
| دبوس 41 | PB1 (T1) — Port B bit 1 / Timer1 external clock |
| دبوس 42 | PB2 (AIN0) — Port B bit 2 / Analog comparator + |
| دبوس 43 | PB3 (AIN1) — Port B bit 3 / Analog comparator - |
| دبوس 44 | PB4 (SS) — Port B bit 4 / SPI slave select |
التطبيقات النموذجية
ATMEGA644P-A15AZ مناسب لـ 6 التطبيقs: Automotive Body Control Module, Industrial Sensor Data Logger, Embedded Instrumentation and Metering, Consumer Appliance Control Board, HVAC and Building Automation Nodes, Educational and Hobbyist Development Boards.
Automotive Body Control Module
The ATMEGA644P-A15AZ suits automotive body control modules (BCM) where 53 I/O lines, 5 V tolerance, and AEC-Q100 stress-test qualification (AZ suffix) are required for door, lighting, and accessory control. Its 64 KB Flash holds BCM firmware plus CAN/LIN driver tables, while 4 KB SRAM comfortably buffers switch-debounce state machines and 2 KB EEPROM retains user-configurable settings such as seat memory positions across power cycles. The 16 MHz AVR core executes control logic at 16 MIPS, comfortably handling 10 ms body-control task loops.
موصى به
Industrial Sensor Data Logger
For multi-channel industrial sensor data loggers, the ATMEGA644P-A15AZ offers a 10-bit 8-channel ADC paired with 2 KB EEPROM and 64 KB Flash, enabling local storage of calibration coefficients and 30-60 days of logged samples. The 5 V I/O tolerance accepts legacy industrial transducer outputs directly without level shifting, and 53 I/O lines support keypad entry, LCD drives, and discrete status LEDs. The picoPower sleep modes reduce quiescent draw to a few microamps for battery-backed remote telemetry nodes.
موصى به
Embedded Instrumentation and Metering
In digital panel meters, energy monitors, and HVAC controllers, the ATMEGA644P-A15AZ provides the deterministic real-time response that AVR cores are known for, with two USARTs allowing simultaneous Modbus master/slave operation and the 6 PWM channels driving analog-style displays or valve actuators. The 44-pin TQFP footprint fits behind standard 96x96 mm meter front panels, and the -40 C to +85 C operating range covers most indoor and outdoor metering enclosures without additional thermal hardening.
موصى به
Consumer Appliance Control Board
The ATMEGA644P-A15AZ is well-matched to washing machine, dishwasher, and induction-cooktop control boards, where its 5 V tolerance and 53 I/O lines interface directly to triac drivers, rotary encoders, and 7-segment displays. The 6 PWM channels drive variable-speed BLDC motor control through gate drivers, while the 16 MHz throughput executes sensor-fusion control loops within 1 ms. The picoPower architecture reduces standby consumption to meet Energy Star appliance idle-power budgets.
موصى به
HVAC and Building Automation Nodes
For BACnet, Modbus, or KNX building automation nodes, the ATMEGA644P-A15AZ supplies 64 KB of firmware headroom for protocol stacks, scheduling logic, and on-board web servers over Ethernet. Its two USARTs bridge to RS-485 sensor busses while SPI serves wireless or Ethernet modules. The automotive-grade temperature tolerance handles unconditioned mechanical rooms and rooftop installations, where -40 C cold-start and +105 C summer heat are common.
موصى به
Educational and Hobbyist Development Boards
The ATMEGA644P-A15AZ and its DIP-package siblings are popular in university embedded-systems courses, Arduino-variant boards, and open-source hardware projects because of the deterministic AVR toolchain (avr-gcc, AVR Studio), abundant reference designs, and 53 I/O lines that allow multiple peripheral exercises on a single board. The 5 V-only operation matches classic Arduino shields, and the dual USARTs enable serial-monitor debugging alongside project-specific bus traffic without conflict.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ ATMEGA644P-A15AZ — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | ATMEGA644P-15AT1 | ATMEGA644PA-AU | ATMEGA324PV-10AU |
|---|---|---|---|---|
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 64 KB | 32 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 2 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 1 KB |
| Max Clock Frequency | 16 MHz | 16 MHz | 20 MHz | 10 MHz |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| GPIO Pins | 53 | 53 | 53 | 53 |
| Automotive Grade (AEC-Q100) | Yes (AZ suffix) | Industrial grade | Industrial grade | Industrial grade |
| Lifecycle Status | NRND | NRND | Active | Active |
أبرز الفروقات
- AEC-Q100 automotive grade with 105 C operating temperature (مقابلATMEGA644PA-AU)
- Highest Flash density in the 44-TQFP AVR family at 16 MHz (مقابلATMEGA324PV-10AU)
- Dual USART for multi-bus industrial networking (مقابلATMEGA164A-AU)
ملاحظات التصميم
The ATMEGA644P-A15AZ requires a stable 4.5 V to 5.5 V supply; place a 100 nF ceramic decoupling capacitor within 5 mm of each VCC pin (44-TQFP has multiple VCC/GND pins) and a bulk 10 uF tantalum or ceramic at the regulator output. The picoPower architecture supports six sleep modes (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, Extended Standby) that drop quiescent current to <1 uA in Power-down mode. For automotive designs, add a TVS diode on the VCC line and an input fuse per ISO 7637-2 transient immunity requirements.
Do not assume the ATMEGA644P-A15AZ operates at 3.3 V - the A15AZ speed grade is characterized at 5 V and 16 MHz only. Mixing 3.3 V peripherals on the same I/O rail without level shifting will violate Vih specifications. Use the ATMEGA644PA family for low-voltage designs. Also note that the part is NRND per Microchip; for new designs, choose the ATMEGA644PA-AU which is pin-compatible, supports 1.8-5.5 V, and has active lifecycle status.
Place the 16 MHz crystal or resonator within 10 mm of XTAL1/XTAL2 pins, with the load capacitors (typically 22 pF for HC-49S crystals) returned to analog ground. Keep ADC traces (PA0-PA7, AVCC, AREF, AGND) away from switching nodes and route AGND as a separate net that joins GND only at the regulator ground point (star grounding). For JTAG/debugWire, bring out the RESET, PC2-PC5 (TCK/TMS/TDO/TDI) signals to a 2x5 0.05" header for in-circuit programming with Atmel-ICE or AVR Dragon.
معلومات الامتثال
AEC-Q100 qualification per AZ speed-grade suffix. RoHS and REACH compliant per Microchip product page. Lead-free and halogen-free per package documentation.