ATMEGA64L-8AJ - 8MHz 64KB Flash AVR MCU | Microchip
MPN: ATMEGA64L-8AJ ✓ فعالATMEGA64L-8AJ نمای کلی
An AVR microcontroller is an 8-bit reduced-instruction-set (RISC) MCU built around a Harvard architecture that executes most instructions in a single clock cycle, placing it in the embedded microcontroller tier of the semiconductor hierarchy: microcontroller -> integrated circuit -> semiconductor. AVR MCUs from Microchip Technology are widely used in industrial control, consumer devices, and automotive sub-systems.
Key features include 64KB self-programmable Flash with a separate boot lock section, 53 general-purpose I/O lines, and rich peripherals: two 8-bit timers, two 16-bit timers, an 8-channel 10-bit ADC, two UART/USART ports, SPI, and I2C (TWI) interfaces. JTAG boundary scan and on-chip debug simplify development and production testing.
The AVR core achieves close to 1 MIPS per MHz throughput, so the 8MHz ATmega64L delivers roughly 8 MIPS while consuming low quiescent power, with six software-selectable sleep modes for battery-operated designs. The external memory interface expands addressable SRAM beyond the internal 4KB, and a full-duplex UART plus master/slave SPI support multi-chip systems.
Typical applications include industrial automation controllers, HVAC and building management panels, data loggers, and 5V legacy board upgrades where the 100% pin-compatible replacement of ATmega103 is exploited.
Design consideration: keep the L-grade 8MHz frequency limit in mind - if your firmware needs more than 8MHz at 5V, select the ATMEGA64-16AU 16MHz variant on the same footprint.
This page synthesizes distributor availability, drop-in alternatives, pinout, and practical design notes not found in the manufacturer datasheet.
جایگزین‌های drop-in برای ATMEGA64L-8AJ — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای ATMEGA64L-8AJ (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Package, ADC, EEPROM, Operating Temperature, Program Memory Size.
ATMEGA64L-8AU
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATMEGA64L-8AI
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATMEGA64A-AUR
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATMEGA64-16AU
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATMEGA103-6AC
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATMEGA64L-8AJ حداکثر مقادیر مجاز و مشخصات الکتریکی
| Core Architecture | 8-bit AVR RISC |
| Program Memory (Flash) | 64KB (32K x 16) |
| SRAM | 4KB |
| EEPROM | 2KB |
| Maximum Clock Speed | 8MHz |
| ولتاژ تغذیه | 2.7V to 5.5V |
| عرض گذرگاه داده | 8 bit |
| I/O Ports | 53 I/O lines |
| ADC | 8-channel 10-bit |
| Communication Interfaces | I2C (TWI), SPI, 2x UART/USART |
| Timers | 2x 8-bit, 2x 16-bit |
| بسته‌بندی | 64-TQFP (14x14 mm) |
| نوع نصب | Surface Mount |
| On-Chip Debug | JTAG (IEEE 1149.1) |
| External Memory Interface | Yes (expandable SRAM) |
| Lifecycle Stage | ACTIVE |
| Approximate Throughput | Up to 8 MIPS at 8MHz |
پیکربندی پین ATMEGA64L-8AJ
| پین 1 | PEN — Programming Enable (high-voltage parallel programming) |
| پین 2 | PB0/SS — Port B bit 0 / SPI Slave Select |
| پین 3 | PB1/SCK — Port B bit 1 / SPI Serial Clock |
| پین 4 | PB2/MOSI — Port B bit 2 / SPI Master Output |
| پین 5 | PB3/MISO — Port B bit 3 / SPI Master Input |
| پین 6 | PB4/OC0 — Port B bit 4 / Timer0 Output Compare |
| پین 7 | PB5/OC1A — Port B bit 5 / Timer1 Output Compare A |
| پین 8 | PB6/OC1B — Port B bit 6 / Timer1 Output Compare B |
| پین 9 | PB7/OC2 — Port B bit 7 / Timer2 Output Compare |
| پین 10 | RESET — Active-low reset input |
| پین 11 | VCC — Digital supply voltage |
| پین 12 | GND — Ground |
| پین 13 | XTAL2 — Crystal oscillator output |
| پین 14 | XTAL1 — Crystal oscillator input / external clock |
| پین 15 | PD0/SCL/INT0 — Port D bit 0 / TWI SCL / External Interrupt 0 |
| پین 16 | PD1/SDA/INT1 — Port D bit 1 / TWI SDA / External Interrupt 1 |
| پین 17 | PD2/RXD1 — Port D bit 2 / USART1 receive |
| پین 18 | PD3/TXD1 — Port D bit 3 / USART1 transmit |
| پین 19 | PD4/IC1 — Port D bit 4 / Timer1 Input Capture |
| پین 20 | PD5/XCK1 — Port D bit 5 / USART1 external clock |
| پین 21 | PD6/T1 — Port D bit 6 / Timer1 external counter |
| پین 22 | PD7/T2 — Port D bit 7 / Timer2 external counter |
| پین 23 | PE0/RXD0 — Port E bit 0 / USART0 receive |
| پین 24 | PE1/TXD0 — Port E bit 1 / USART0 transmit |
| پین 25 | PE2/AIN0 — Port E bit 2 / Analog Comparator positive input |
| پین 26 | PE3/AIN1 — Port E bit 3 / Analog Comparator negative input |
| پین 27 | PE4/OC3B/INT4 — Port E bit 4 / Timer3 Output Compare B / INT4 |
| پین 28 | PE5/OC3C/INT5 — Port E bit 5 / Timer3 Output Compare C / INT5 |
| پین 29 | PE6/T3/INT6 — Port E bit 6 / Timer3 clock / INT6 |
| پین 30 | PE7/ICP3/INT7 — Port E bit 7 / Timer3 Input Capture / INT7 |
| پین 31 | VCC — Digital supply voltage |
| پین 32 | GND — Ground |
| پین 33 | PF0/ADC0 — Port F bit 0 / ADC channel 0 |
| پین 34 | PF1/ADC1 — Port F bit 1 / ADC channel 1 |
| پین 35 | PF2/ADC2 — Port F bit 2 / ADC channel 2 |
| پین 36 | PF3/ADC3 — Port F bit 3 / ADC channel 3 |
| پین 37 | PF4/ADC4/TCK — Port F bit 4 / ADC channel 4 / JTAG TCK |
| پین 38 | PF5/ADC5/TMS — Port F bit 5 / ADC channel 5 / JTAG TMS |
| پین 39 | PF6/ADC6/TDO — Port F bit 6 / ADC channel 6 / JTAG TDO |
| پین 40 | PF7/ADC7/TDI — Port F bit 7 / ADC channel 7 / JTAG TDI |
| پین 41 | PG0/WR — Port G bit 0 / External memory write strobe |
| پین 42 | PG1/RD — Port G bit 1 / External memory read strobe |
| پین 43 | PC0/A8 — Port C bit 0 / External memory address bit 8 |
| پین 44 | PC1/A9 — Port C bit 1 / External memory address bit 9 |
| پین 45 | PC2/A10 — Port C bit 2 / External memory address bit 10 |
| پین 46 | PC3/A11 — Port C bit 3 / External memory address bit 11 |
| پین 47 | PC4/A12 — Port C bit 4 / External memory address bit 12 |
| پین 48 | PC5/A13 — Port C bit 5 / External memory address bit 13 |
| پین 49 | PC6/A14 — Port C bit 6 / External memory address bit 14 |
| پین 50 | PC7/A15 — Port C bit 7 / External memory address bit 15 |
| پین 51 | GND — Ground |
| پین 52 | VCC — Digital supply voltage |
| پین 53 | PA0/AD0 — Port A bit 0 / External memory address/data bit 0 |
| پین 54 | PA1/AD1 — Port A bit 1 / External memory address/data bit 1 |
| پین 55 | PA2/AD2 — Port A bit 2 / External memory address/data bit 2 |
| پین 56 | PA3/AD3 — Port A bit 3 / External memory address/data bit 3 |
| پین 57 | PA4/AD4 — Port A bit 4 / External memory address/data bit 4 |
| پین 58 | PA5/AD5 — Port A bit 5 / External memory address/data bit 5 |
| پین 59 | PA6/AD6 — Port A bit 6 / External memory address/data bit 6 |
| پین 60 | PA7/AD7 — Port A bit 7 / External memory address/data bit 7 |
| پین 61 | AREF — ADC analog reference input |
| پین 62 | AVCC — Analog supply for ADC and Port F |
| پین 63 | AGND — Analog ground |
| پین 64 | PG2/ALE — Port G bit 2 / External memory address latch enable |
کاربردهای معمول
ATMEGA64L-8AJ مناسب است برای 6 کاربردs: Industrial Automation Controllers, HVAC and Building Management Panels, Battery-Powered Data Loggers, Legacy ATmega103 Board Maintenance, Multi-Protocol Communication Nodes, 5V Legacy Board Upgrades and Retrofits.
Industrial Automation Controllers
The ATMEGA64L-8AJ fits industrial automation controllers because its 64KB Flash stores complex state machines and communication stacks, while 53 I/O lines drive relays, indicators, and keypads directly. The dual full-duplex UART/USART ports enable simultaneous Modbus RTU slave and diagnostic links, and the I2C/SPI interfaces connect RTCs and EEPROM for configuration storage. Operating from 2.7V to 5.5V, the part integrates cleanly on legacy 5V control boards. JTAG boundary-scan supports production test on densely populated boards, and the external memory interface expands beyond 4KB SRAM when data buffering grows, all at roughly 8 MIPS throughput.
پیشنهادی
HVAC and Building Management Panels
Building management and HVAC control panels benefit from the ATMEGA64L-8AJ's 8-channel 10-bit ADC, which digitizes up to eight temperature, humidity, or pressure sensor inputs without an external converter. The 2KB EEPROM preserves setpoints and schedules across power cycles, and the TWI (I2C) interface chains multiple peripheral devices on a two-wire bus. The 8MHz L-grade device runs cool and supports sleep modes between polling cycles, reducing average power in always-on installations. UART connectivity reports status to a supervisor network, while the 64KB Flash holds menus, fonts, and schedule tables for local operator interfaces on 5V panels.
پیشنهادی
Battery-Powered Data Loggers
For battery-powered data loggers, the ATMEGA64L-8AJ combines six software-selectable sleep modes with 2.7V operation, extending battery life in field instruments that sample for months. The 8-channel 10-bit ADC captures multi-sensor analog inputs, and the external memory interface addresses external SRAM beyond the internal 4KB for long recording sessions. SPI handles fast serial flash or SD-card style storage, while one UART streams logged data to a PC during retrieval. The 64KB Flash reserves boot-section space for firmware updates in the field via the self-programming bootloader, eliminating recalls when calibration or logging logic changes are required after deployment.
پیشنهادی
Legacy ATmega103 Board Maintenance
The ATmega64 is, per Microchip's datasheet, 100% pin compatible with ATmega103 and can replace it on current printed circuit boards, making ATMEGA64L-8AJ the standard migration device for maintaining legacy ATmega103-based equipment. As ATmega103 becomes scarce, production lines solder ATmega64 into the existing TQFP-64 footprint with no PCB change. The migration application notes document the register-level differences that firmware must absorb, typically small peripheral initialization changes. Hardware compatibility preserves tooling, fixtures, and validation investment. The 2.7V to 5.5V L-grade supply range covers both the original 5V boards and any 3.3V derivatives in the same product family.
پیشنهادی
Multi-Protocol Communication Nodes
Communication nodes benefit from the ATMEGA64L-8AJ's two independent UART/USART ports, which allow simultaneous operation of, for example, a Modbus or proprietary field bus on one port and a service console on the other. SPI and TWI add local expansion to port expanders, ADCs, and displays, so a single MCU can bridge field wiring and a local touch interface. The external bus interface (ALE/RD/WR with multiplexed address-data ports) offloads memory-hungry protocol buffers to external SRAM. At 8MHz the AVR core delivers roughly 8 MIPS, sufficient for interrupt-driven framing, checksum computation, and packet routing at field-bus data rates while leaving headroom in the 64KB Flash.
پیشنهادی
5V Legacy Board Upgrades and Retrofits
Many industrial products in the field remain 5V designs, and the ATMEGA64L-8AJ is a natural fit for these retrofits because the L grade tolerates 5V while also accepting 3.3V, giving one BOM part across board revisions. The 64-TQFP (14x14 mm) footprint is mechanically robust for wave and selective soldering processes common in repair shops. The 2KB EEPROM emulates old NV-RAM setpoint storage, and the 10-bit ADC replaces external A/D chips on older boards. JTAG on-chip debug shortens bring-up of upgraded firmware, and the boot-lock Flash section enables authenticated firmware updates through an existing serial port without socketing devices on serviced boards.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای ATMEGA64L-8AJ — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | ATMEGA64L-8AU | ATMEGA64L-8AI | ATMEGA64A-AUR | ATMEGA64-16AU |
|---|---|---|---|---|---|
| Package | 64-TQFP (14x14) | 64-TQFP (14x14) - same | 64-TQFP (14x14) - same | 64-TQFP (14x14) - same | 64-TQFP (14x14) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64KB (32K x 16) | 64KB | 64KB | 64KB | 64KB |
| SRAM | 4KB | 4KB | 4KB | 4KB | 4KB |
| Maximum Clock Speed | 8MHz | 8MHz | 8MHz | 16MHz (A-generation spec) | 16MHz |
| Supply Voltage | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 4.5V to 5.5V |
تفاوت‌های کلیدی
- Widest supply range in same footprint (در مقابلATMEGA64-16AU)
- 100% pin-compatible ATmega103 replacement (در مقابلATmega103)
- Dual UART/USART on a mid-range 8-bit AVR (در مقابلATMEGA32L-8AI)
یادداشت‌های طراحی
Decouple all three VCC pins (11, 31, 52) with 100nF ceramic capacitors placed as close as possible to each pin, plus one bulk 10uF capacitor per supply rail. AVCC (pin 62) must be connected to VCC through a low-pass filter (e.g., 10uH inductor or ferrite bead plus 100nF) when ADC accuracy matters, per the ATmega64/L datasheet power-supply guidance. At 2.7V minimum operation, verify brown-out detector settings, since the BOD threshold must sit between the operating voltage floor and the minimum VCC to protect EEPROM writes.
Keep AGND (pin 63) and AREF (pin 61) routing away from the switching nodes of any upstream regulator; connect AGND to a quiet analog ground island tied to digital ground at a single point. Star-route the crystal (XTAL1/XTAL2, pins 14/13) with short traces and place load capacitors within 3-5mm of the pins to minimize jitter and startup failures. If the external memory bus (PA0-PA7, PC0-PC7, ALE, RD, WR) is used, keep the AD bus length-matched and add series 22-33 ohm resistors on ALE/WR/RD to control ringing on 5V-level strobes.
The most frequent integration error is clocking this L-grade part above 8MHz - unlike some AVR speed grades, ATMEGA64L-8AJ is not rated higher even at 5V; use ATMEGA64-16AU for faster clocks. Second, JTAG enable is fused on by default and JTAG pins PF4-PF7 double as ADC4-ADC7; if you need all eight ADC channels, disable JTAGEN via fuse or software JTD bit. Third, when migrating from ATmega103, remember register and bit positions differ - follow the Microchip migration application notes rather than reusing register definitions.
اطلاعات انطباق
Compliance attributes were not stated in the provided verified web data; verify RoHS/REACH status on the Microchip product page or distributor listing before procurement.
