ATMEGA644P-A15AZ - 64KB Flash 16MHz 5V AVR MCU | Microchip
MPN: ATMEGA644P-A15AZ ✗ Cuối đờiATMEGA644P-A15AZ Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho ATMEGA644P-A15AZ — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ATMEGA644P-A15AZ (cùng hình factor và footprint) — khác nhau ở EEPROM, Operating Temperature, Package, SRAM, Program Memory (Flash).
ATMEGA644P-15AT1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA644PA-AU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA644P-20PU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA324PV-10AU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA644P-A15AZ Tỷ lệ tối đa & tính chất điện
| 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 |
| Nhiệt độ hoạt động | -40 C to +85 C (industrial) / -40 C to +105 C (automotive grade) |
| Hộp | 44-pin TQFP (10x10 mm) |
| Kiểu lắp đặt | Surface Mount |
| Automotive Qualification | AEC-Q100 (per AZ speed-grade suffix) |
| Trạng thái RoHS | Compliant |
Cấu hình chân ATMEGA644P-A15AZ
| Chân 1 | PB5 (MOSI) — Port B bit 5 / SPI MOSI |
| Chân 2 | PB6 (MISO) — Port B bit 6 / SPI MISO |
| Chân 3 | PB7 (SCK) — Port B bit 7 / SPI SCK |
| Chân 4 | RESET — Reset input, active low |
| Chân 5 | VCC — Digital supply voltage |
| Chân 6 | GND — Digital ground |
| Chân 7 | XTAL2 — Crystal oscillator pin 2 |
| Chân 8 | XTAL1 — Crystal oscillator pin 1 |
| Chân 9 | PD0 (RXD0) — Port D bit 0 / USART0 RXD |
| Chân 10 | PD1 (TXD0) — Port D bit 1 / USART0 TXD |
| Chân 11 | PD2 (INT0) — Port D bit 2 / External INT0 |
| Chân 12 | PD3 (INT1) — Port D bit 3 / External INT1 |
| Chân 13 | PD4 (OC1B) — Port D bit 4 / Timer1 output compare B |
| Chân 14 | PD5 (OC1A) — Port D bit 5 / Timer1 output compare A |
| Chân 15 | PD6 (ICP1) — Port D bit 6 / Timer1 input capture |
| Chân 16 | PD7 (OC2) — Port D bit 7 / Timer2 output compare |
| Chân 17 | VCC — Digital supply voltage |
| Chân 18 | GND — Digital ground |
| Chân 19 | PC0 (SCL) — Port C bit 0 / TWI SCL |
| Chân 20 | PC1 (SDA) — Port C bit 1 / TWI SDA |
| Chân 21 | PC2 (TCK) — Port C bit 2 / JTAG TCK |
| Chân 22 | PC3 (TMS) — Port C bit 3 / JTAG TMS |
| Chân 23 | PC4 (TDO) — Port C bit 4 / JTAG TDO |
| Chân 24 | PC5 (TDI) — Port C bit 5 / JTAG TDI |
| Chân 25 | PC6 (TOSC1) — Port C bit 6 / Timer0 oscillator |
| Chân 26 | PC7 (TOSC2) — Port C bit 7 / Timer0 oscillator |
| Chân 27 | AVCC — Analog supply voltage |
| Chân 28 | AREF — ADC reference voltage |
| Chân 29 | AGND — Analog ground |
| Chân 30 | PA7 (ADC7) — Port A bit 7 / ADC input channel 7 |
| Chân 31 | PA6 (ADC6) — Port A bit 6 / ADC input channel 6 |
| Chân 32 | PA5 (ADC5) — Port A bit 5 / ADC input channel 5 |
| Chân 33 | PA4 (ADC4) — Port A bit 4 / ADC input channel 4 |
| Chân 34 | PA3 (ADC3) — Port A bit 3 / ADC input channel 3 |
| Chân 35 | PA2 (ADC2) — Port A bit 2 / ADC input channel 2 |
| Chân 36 | PA1 (ADC1) — Port A bit 1 / ADC input channel 1 |
| Chân 37 | PA0 (ADC0) — Port A bit 0 / ADC input channel 0 |
| Chân 38 | VCC — Digital supply voltage |
| Chân 39 | GND — Digital ground |
| Chân 40 | PB0 (XCK0) — Port B bit 0 / USART0 clock |
| Chân 41 | PB1 (T1) — Port B bit 1 / Timer1 external clock |
| Chân 42 | PB2 (AIN0) — Port B bit 2 / Analog comparator + |
| Chân 43 | PB3 (AIN1) — Port B bit 3 / Analog comparator - |
| Chân 44 | PB4 (SS) — Port B bit 4 / SPI slave select |
Ứng dụng tiêu biểu
ATMEGA644P-A15AZ phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATMEGA644P-A15AZ — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- AEC-Q100 automotive grade with 105 C operating temperature (vsATMEGA644PA-AU)
- Highest Flash density in the 44-TQFP AVR family at 16 MHz (vsATMEGA324PV-10AU)
- Dual USART for multi-bus industrial networking (vsATMEGA164A-AU)
Ghi chú thiết kế
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.
Thông tin tuân thủ
AEC-Q100 qualification per AZ speed-grade suffix. RoHS and REACH compliant per Microchip product page. Lead-free and halogen-free per package documentation.