ATMEGA64A-AU - 8-bit AVR MCU 64KB Flash 16MHz TQFP-64 | Microchip (Tape & Reel)
MPN: ATMEGA64A-AU ✓ نشطATMEGA64A-AU نظرة عامة
A microcontroller unit (MCU) is a single integrated circuit that combines a processor core, memory, and programmable peripherals into one chip, forming the lowest level of the embedded computing hierarchy (MCU -> embedded processor -> computing system). The AVR ATmega family uses an advanced RISC architecture with 130 powerful instructions, most executed in a single clock cycle, giving roughly 16 MIPS throughput at 16MHz.
Key features include read-while-write ISP Flash for self-programming, two USARTs, four flexible timer/counters with compare modes and PWM, an 8-channel 10-bit ADC, byte-oriented Two-Wire Serial Interface (TWI/I2C), SPI, JTAG for boundary scan and on-chip debugging, and an internal oscillator option that reduces external component count.
Technically, the device provides 32 general purpose working registers directly connected to the ALU, allowing one-cycle instruction execution and C-compiler-friendly code density. The ATmega64A is 100% pin compatible with the legacy ATmega103, and the ATmega64A summary datasheet documents migration paths to and from ATmega128 parts, protecting long-term PCB investments.
Typical applications include industrial control and automation nodes, HVAC and building controllers, motor-adjacent sensing boards, and instrumentation front ends where the 10-bit ADC, dual USART, and PWM channels cover most interface needs from a single chip.
Design considerations: for UART or precise timing, prefer a crystal on XTAL1/XTAL2 because the internal RC oscillator trades accuracy (±2% after calibration) for board space; budget the 4KB SRAM carefully when using large frame buffers or protocol stacks.
This page synthesizes verified distributor listings, pinout data, drop-in alternatives, and practical design guidance not consolidated in the manufacturer datasheet.
بدائل مباشرة لـ ATMEGA64A-AU — 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 ATMEGA64A-AU (نفس عامل الشكل والبصمة) — يختلف في Package, RoHS Status, Program Memory Size, Operating Temperature, ADC.
ATMEGA64-16AU
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ATMEGA128A-AU
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ATMEGA64L-16AU
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
ATMEGA103-8AU
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ATMEGA64A-AU الحدود القصوى والخصائص الكهربائية
| Core Architecture | 8-bit AVR RISC |
| Program Memory Size | 64KB (32K x 16) ISP Flash |
| EEPROM Size | 2KB |
| SRAM Size | 4KB |
| Maximum CPU Speed | 16MHz |
| General Purpose I/O | 53 lines |
| Working Registers | 32 general purpose |
| Timers/Counters | 4 flexible timer/counters with compare modes and PWM |
| ADC | 8-channel, 10-bit (from manufacturer product summary) |
| Communication Interfaces | 2x USART, SPI, TWI (I2C compatible) |
| Oscillator Type | Internal |
| Debug / Test | JTAG for on-chip debug and boundary scan |
| العلبة | 64-TQFP (14x14mm) |
| نوع التركيب | Surface Mount |
| نطاق درجة حرارة التشغيل | Industrial (-40C to +85C) |
| Packaging | Tape & Reel (TR) |
| حالة RoHS | Compliant (GREEN per FindIC listing) |
| Pin Compatibility | 100% pin compatible with ATmega103 |
تكوين أطراف ATMEGA64A-AU
| دبوس 1 | PB0 (SS) — Port B bit 0 / SPI Slave Select |
| دبوس 2 | PB1 (SCK) — Port B bit 1 / SPI Serial Clock |
| دبوس 3 | PB2 (MOSI) — Port B bit 2 / SPI Master Out Slave In |
| دبوس 4 | PB3 (MISO) — Port B bit 3 / SPI Master In Slave Out |
| دبوس 5 | PB4 (OC0) — Port B bit 4 / Timer0 Output Compare |
| دبوس 6 | PB5 (OC1A) — Port B bit 5 / Timer1 Output Compare A |
| دبوس 7 | PB6 (OC1B) — Port B bit 6 / Timer1 Output Compare B |
| دبوس 8 | PB7 (OC2) — Port B bit 7 / Timer2 Output Compare |
| دبوس 9 | RESET — Reset input (active low) |
| دبوس 10 | VCC — Digital supply voltage |
| دبوس 11 | GND — Digital ground |
| دبوس 12 | XTAL2 — Crystal oscillator output 2 |
| دبوس 13 | XTAL1 — Crystal oscillator input 1 / external clock |
| دبوس 14 | PD0 (RXD0) — Port D bit 0 / USART0 receive |
| دبوس 15 | PD1 (TXD0) — Port D bit 1 / USART0 transmit |
| دبوس 16 | PD2 (INT0) — Port D bit 2 / External interrupt 0 |
| دبوس 17 | PD3 (INT1) — Port D bit 3 / External interrupt 1 |
| دبوس 18 | PD4 (IC1) — Port D bit 4 / Timer1 input capture |
| دبوس 19 | PD5 (XCK0) — Port D bit 5 / USART0 external clock |
| دبوس 20 | PD6 (T1) — Port D bit 6 / Timer1 external counter input |
| دبوس 21 | PD7 (T2) — Port D bit 7 / Timer2 external counter input |
| دبوس 22 | VCC — Digital supply voltage |
| دبوس 23 | GND — Digital ground |
| دبوس 24 | PE0 (RXD1) — Port E bit 0 / USART1 receive |
| دبوس 25 | PE1 (TXD1) — Port E bit 1 / USART1 transmit |
| دبوس 26 | PE2 — Port E bit 2 |
| دبوس 27 | PE3 — Port E bit 3 |
| دبوس 28 | PE4 — Port E bit 4 |
| دبوس 29 | PE5 — Port E bit 5 |
| دبوس 30 | PE6 — Port E bit 6 |
| دبوس 31 | PE7 — Port E bit 7 |
| دبوس 32 | VCC — Digital supply voltage |
| دبوس 33 | GND — Digital ground |
| دبوس 34 | PF0 (ADC0) — Port F bit 0 / ADC channel 0 |
| دبوس 35 | PF1 (ADC1) — Port F bit 1 / ADC channel 1 |
| دبوس 36 | PF2 (ADC2) — Port F bit 2 / ADC channel 2 |
| دبوس 37 | PF3 (ADC3) — Port F bit 3 / ADC channel 3 |
| دبوس 38 | PF4 (ADC4) — Port F bit 4 / ADC channel 4 |
| دبوس 39 | PF5 (ADC5) — Port F bit 5 / ADC channel 5 |
| دبوس 40 | PF6 (ADC6) — Port F bit 6 / ADC channel 6 |
| دبوس 41 | PF7 (ADC7) — Port F bit 7 / ADC channel 7 |
| دبوس 42 | AREF — ADC analog reference |
| دبوس 43 | AGND — Analog ground |
| دبوس 44 | AVCC — Analog supply for ADC / Port F |
| دبوس 45 | PA0 (AD0) — Port A bit 0 / External memory address/data line 0 |
| دبوس 46 | PA1 (AD1) — Port A bit 1 / External memory address/data line 1 |
| دبوس 47 | PA2 (AD2) — Port A bit 2 / External memory address/data line 2 |
| دبوس 48 | PA3 (AD3) — Port A bit 3 / External memory address/data line 3 |
| دبوس 49 | PA4 (AD4) — Port A bit 4 / External memory address/data line 4 |
| دبوس 50 | PA5 (AD5) — Port A bit 5 / External memory address/data line 5 |
| دبوس 51 | PA6 (AD6) — Port A bit 6 / External memory address/data line 6 |
| دبوس 52 | PA7 (AD7) — Port A bit 7 / External memory address/data line 7 |
| دبوس 53 | PC0 (A8) — Port C bit 0 / External memory address line 8 / JTAG TCK |
| دبوس 54 | PC1 (A9) — Port C bit 1 / Address line 9 / JTAG TDO |
| دبوس 55 | PC2 (A10) — Port C bit 2 / Address line 10 / JTAG TMS |
| دبوس 56 | PC3 (A11) — Port C bit 3 / Address line 11 / JTAG TDI |
| دبوس 57 | PC4 (A12) — Port C bit 4 / Address line 12 |
| دبوس 58 | PC5 (A13) — Port C bit 5 / Address line 13 |
| دبوس 59 | PC6 (A14) — Port C bit 6 / Address line 14 |
| دبوس 60 | PC7 (A15) — Port C bit 7 / Address line 15 |
| دبوس 61 | PG0 (WR) — Port G bit 0 / External memory write strobe |
| دبوس 62 | PG1 (RD) — Port G bit 1 / External memory read strobe |
| دبوس 63 | PG2 (TOSC1) — Port G bit 2 / Timer oscillator input (32.768kHz RTC crystal) |
| دبوس 64 | PG3 (TOSC2) — Port G bit 3 / Timer oscillator output |
التطبيقات النموذجية
ATMEGA64A-AU مناسب لـ 6 التطبيقs: Industrial Automation Control Nodes, Building Automation and HVAC Controllers, Instrumentation and Data Acquisition Front Ends, Legacy ATmega103 Board Refresh, Motor Control and PWM Actuator Drive, Security and Access Control Terminals.
Industrial Automation Control Nodes
The ATMEGA64A-AU fits industrial control nodes because its industrial -40C to +85C temperature rating, dual USARTs for MODBUS RTU links, and four PWM timer channels cover the full sensor-actuator interface of a typical control board. The 64KB Flash (32K x 16) accommodates protocol stacks plus control logic with headroom, while 4KB SRAM buffers communication frames. In use, the chip sits as the main controller, reading analog sensors through the 8-channel 10-bit ADC and driving relays or actuators via PWM outputs; the industrial rating and active lifecycle status make it safe for long deployment cycles that consumer-grade MCUs cannot guarantee.
موصى به
Building Automation and HVAC Controllers
HVAC and building controllers benefit from the ATmega64A's combination of 53 GPIO lines, 10-bit ADC for temperature and pressure sensors, and TWI (I2C) bus for interfacing RTCs and EEPROM expansion. The 16MHz AVR core delivers roughly 16 MIPS, sufficient for PID control loops and BACnet-style serial communication over one of the two USARTs. Because the part offers read-while-write ISP Flash, firmware and logged setpoints can be updated in the field without removing the board. Its external memory interface on PORTA/PORTC also allows RAM expansion if logging requirements grow, making it a durable backbone for thermostat and air-handler boards.
موصى به
Instrumentation and Data Acquisition Front Ends
The 8-channel 10-bit ADC, precise timer capture capability (IC1 input capture on PD4), and JTAG on-chip debug make the ATmega64A a practical acquisition front end for bench instruments and dataloggers. Four timer/counters enable frequency measurement, PWM stimulus generation, and timestamped event capture simultaneously. With 64KB of self-programmable Flash, the firmware can store calibration tables and even reflash itself from a bootloader. Per designs referenced in Microchip application literature, sampling loops over the ADC at moderate rates are easily scheduled, and the 2KB EEPROM retains calibration data across power cycles without external nonvolatile memory.
موصى به
Legacy ATmega103 Board Refresh
According to the official ATmega64A summary datasheet, the ATmega64A is 100% pin compatible with ATmega103 and can replace it on current printed circuit boards, with Microchip's application note 'Replacing ATmega103 by ATmega64A' documenting the migration details. This makes ATMEGA64A-AU the designated refresh path for the large installed base of ATmega103-based industrial and telecom boards that face ATmega103 end-of-life. Because the footprint, supply pins, and port mapping are identical, requalification is limited to firmware recompilation and verification, dramatically reducing redesign cost versus a re-layout onto a modern MCU package.
موصى به
Motor Control and PWM Actuator Drive
The ATmega64A's four timer/counters with compare modes and PWM outputs (OC0, OC1A, OC1B, OC2 on PORTB) directly generate multi-channel PWM for DC motor drivers, LED dimming, and heater control. The input capture feature provides rotational speed feedback from encoders, closing the control loop in firmware. At 16MHz the single-cycle AVR core executes control ISR routines deterministically, while the 10-bit ADC reads current-sense shunts for overload protection. Designs pair the MCU with external MOSFET gate drivers; the MCU's 5V tolerant industrial I/O and abundant 53 GPIO leave routing margin for direction, enable, and fault-handling signals on dense boards.
موصى به
Security and Access Control Terminals
Access-control terminals exploit the ATmega64A's balance of memory and interfaces: 64KB Flash holds cryptography-light access tables and event logs, 2KB EEPROM stores credential keys that survive power loss, and 4KB SRAM buffers keypad input and RS-485 traffic over a USART. The TWI bus reads real-time clocks and RFID reader front ends, while ample GPIO drives relays and status indicators directly. The JTAG interface supports production debugging and boundary-scan board test, and the industrial temperature range suits outdoor reader cabinets. Its active lifecycle status ensures continued availability for security products with multi-year service commitments.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ ATMEGA64A-AU — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | ATMEGA64A-AU | ATMEGA64-16AU | ATMEGA128A-AU | ATMEGA103-8AU |
|---|---|---|---|---|---|
| Package | 64-TQFP (14x14mm) | 64-TQFP (14x14mm) - same | 64-TQFP (14x14mm) - same | 64-TQFP (14x14mm) - same | 64-TQFP (14x14mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology (Atmel) |
| Flash Memory | 64KB (32K x 16) | 64KB (32K x 16) | 64KB (32K x 16) | 128KB (64K x 16) | 128KB |
| SRAM | 4KB | 4KB | 4KB | 8KB | 4KB |
| Max Clock Speed | 16MHz | 16MHz | 16MHz | 16MHz | 8MHz |
| GPIO Count | 53 | 53 | 53 | 53 | 48 |
| Lifecycle Status | Active | Active | Active (legacy die) | Active | Obsolete / EOL |
| Pin Compatibility | 100% compatible with ATmega103 | Identical (same die) | 100% pin-to-pin | 100% pin-to-pin (documented migration) | 100% pin-to-pin (legacy reference) |
أبرز الفروقات
- Current-generation 'A' die with active lifecycle (مقابلATMEGA103-8AU)
- Headroom upgrade path on the same PCB (مقابلATMEGA64-16AU)
- External memory bus plus dual USART (مقابلATMEGA48PA-AUR)
ملاحظات التصميم
Decouple all VCC pins (10, 22, 32) with 100nF ceramic capacitors placed within 5mm of each pin, plus one bulk 10uF capacitor near the supply entry. AVCC (pin 44) should be connected to VCC through a low-pass LC filter (10uH + 10uF) when ADC accuracy matters, and AREF (pin 42) should be decoupled with 100nF to AGND - never drive AREF from a low-impedance source when the internal reference is enabled. Estimated: with a typical 30mA active current at 5V, total dissipation is roughly 0.15W, requiring no heatsink.
Keep the analog island (pins 34-44: ADC inputs, AREF, AGND, AVCC) physically separated from the digital switching area and route a solid ground return to AGND. Place the JTAG header (PC0-PC3, pins 53-56) close to the connector and include the standard 10-pin AVR JTAG layout so on-chip debugging stays possible in production housings. Leave probe pads on XTAL1/XTAL2 and RESET for production programming and clock measurement.
Do not rely on the internal RC oscillator for USART communication: its accuracy is only a few percent even after calibration, while UART needs about 2% total budget - use a crystal when either USART is active. When migrating from ATmega103, note that fuse defaults, register maps, and peripheral features differ; follow Microchip's 'Replacing ATmega103 by ATmega64A' application note rather than assuming binary compatibility. Also verify that PG2/PG3 are configured for the timer oscillator only if a 32.768kHz crystal is actually fitted.
معلومات الامتثال
Listed as 'GREEN' (RoHS-compliant, lead-free Matte Tin per 'U' suffix) in the FindIC distributor data. REACH, halogen-free and conflict-minerals declarations not stated in provided data.
