ATMEGA64A-AU - 8-bit AVR MCU 64KB Flash 16MHz TQFP-64 | Microchip (Tape & Reel)
MPN: ATMEGA64A-AU ✓ Hoạt độngATMEGA64A-AU Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho ATMEGA64A-AU — 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 ATMEGA64A-AU (cùng hình factor và footprint) — khác nhau ở Package, RoHS Status, Program Memory Size, Operating Temperature, ADC.
ATMEGA64-16AU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA128A-AU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA64L-16AU
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA103-8AU
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA64A-AU Tỷ lệ tối đa & tính chất điện
| 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 |
| Hộp | 64-TQFP (14x14mm) |
| Kiểu lắp đặt | Surface Mount |
| Khoảng nhiệt độ hoạt động | Industrial (-40C to +85C) |
| Packaging | Tape & Reel (TR) |
| Trạng thái RoHS | Compliant (GREEN per FindIC listing) |
| Pin Compatibility | 100% pin compatible with ATmega103 |
Cấu hình chân ATMEGA64A-AU
| Chân 1 | PB0 (SS) — Port B bit 0 / SPI Slave Select |
| Chân 2 | PB1 (SCK) — Port B bit 1 / SPI Serial Clock |
| Chân 3 | PB2 (MOSI) — Port B bit 2 / SPI Master Out Slave In |
| Chân 4 | PB3 (MISO) — Port B bit 3 / SPI Master In Slave Out |
| Chân 5 | PB4 (OC0) — Port B bit 4 / Timer0 Output Compare |
| Chân 6 | PB5 (OC1A) — Port B bit 5 / Timer1 Output Compare A |
| Chân 7 | PB6 (OC1B) — Port B bit 6 / Timer1 Output Compare B |
| Chân 8 | PB7 (OC2) — Port B bit 7 / Timer2 Output Compare |
| Chân 9 | RESET — Reset input (active low) |
| Chân 10 | VCC — Digital supply voltage |
| Chân 11 | GND — Digital ground |
| Chân 12 | XTAL2 — Crystal oscillator output 2 |
| Chân 13 | XTAL1 — Crystal oscillator input 1 / external clock |
| Chân 14 | PD0 (RXD0) — Port D bit 0 / USART0 receive |
| Chân 15 | PD1 (TXD0) — Port D bit 1 / USART0 transmit |
| Chân 16 | PD2 (INT0) — Port D bit 2 / External interrupt 0 |
| Chân 17 | PD3 (INT1) — Port D bit 3 / External interrupt 1 |
| Chân 18 | PD4 (IC1) — Port D bit 4 / Timer1 input capture |
| Chân 19 | PD5 (XCK0) — Port D bit 5 / USART0 external clock |
| Chân 20 | PD6 (T1) — Port D bit 6 / Timer1 external counter input |
| Chân 21 | PD7 (T2) — Port D bit 7 / Timer2 external counter input |
| Chân 22 | VCC — Digital supply voltage |
| Chân 23 | GND — Digital ground |
| Chân 24 | PE0 (RXD1) — Port E bit 0 / USART1 receive |
| Chân 25 | PE1 (TXD1) — Port E bit 1 / USART1 transmit |
| Chân 26 | PE2 — Port E bit 2 |
| Chân 27 | PE3 — Port E bit 3 |
| Chân 28 | PE4 — Port E bit 4 |
| Chân 29 | PE5 — Port E bit 5 |
| Chân 30 | PE6 — Port E bit 6 |
| Chân 31 | PE7 — Port E bit 7 |
| Chân 32 | VCC — Digital supply voltage |
| Chân 33 | GND — Digital ground |
| Chân 34 | PF0 (ADC0) — Port F bit 0 / ADC channel 0 |
| Chân 35 | PF1 (ADC1) — Port F bit 1 / ADC channel 1 |
| Chân 36 | PF2 (ADC2) — Port F bit 2 / ADC channel 2 |
| Chân 37 | PF3 (ADC3) — Port F bit 3 / ADC channel 3 |
| Chân 38 | PF4 (ADC4) — Port F bit 4 / ADC channel 4 |
| Chân 39 | PF5 (ADC5) — Port F bit 5 / ADC channel 5 |
| Chân 40 | PF6 (ADC6) — Port F bit 6 / ADC channel 6 |
| Chân 41 | PF7 (ADC7) — Port F bit 7 / ADC channel 7 |
| Chân 42 | AREF — ADC analog reference |
| Chân 43 | AGND — Analog ground |
| Chân 44 | AVCC — Analog supply for ADC / Port F |
| Chân 45 | PA0 (AD0) — Port A bit 0 / External memory address/data line 0 |
| Chân 46 | PA1 (AD1) — Port A bit 1 / External memory address/data line 1 |
| Chân 47 | PA2 (AD2) — Port A bit 2 / External memory address/data line 2 |
| Chân 48 | PA3 (AD3) — Port A bit 3 / External memory address/data line 3 |
| Chân 49 | PA4 (AD4) — Port A bit 4 / External memory address/data line 4 |
| Chân 50 | PA5 (AD5) — Port A bit 5 / External memory address/data line 5 |
| Chân 51 | PA6 (AD6) — Port A bit 6 / External memory address/data line 6 |
| Chân 52 | PA7 (AD7) — Port A bit 7 / External memory address/data line 7 |
| Chân 53 | PC0 (A8) — Port C bit 0 / External memory address line 8 / JTAG TCK |
| Chân 54 | PC1 (A9) — Port C bit 1 / Address line 9 / JTAG TDO |
| Chân 55 | PC2 (A10) — Port C bit 2 / Address line 10 / JTAG TMS |
| Chân 56 | PC3 (A11) — Port C bit 3 / Address line 11 / JTAG TDI |
| Chân 57 | PC4 (A12) — Port C bit 4 / Address line 12 |
| Chân 58 | PC5 (A13) — Port C bit 5 / Address line 13 |
| Chân 59 | PC6 (A14) — Port C bit 6 / Address line 14 |
| Chân 60 | PC7 (A15) — Port C bit 7 / Address line 15 |
| Chân 61 | PG0 (WR) — Port G bit 0 / External memory write strobe |
| Chân 62 | PG1 (RD) — Port G bit 1 / External memory read strobe |
| Chân 63 | PG2 (TOSC1) — Port G bit 2 / Timer oscillator input (32.768kHz RTC crystal) |
| Chân 64 | PG3 (TOSC2) — Port G bit 3 / Timer oscillator output |
Ứng dụng tiêu biểu
ATMEGA64A-AU phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATMEGA64A-AU — 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 | 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) |
Bảo phân biệt quan trọng
- Current-generation 'A' die with active lifecycle (vsATMEGA103-8AU)
- Headroom upgrade path on the same PCB (vsATMEGA64-16AU)
- External memory bus plus dual USART (vsATMEGA48PA-AUR)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
