ATMEGA64L-8AI - 8-bit AVR MCU 64KB Flash 8MHz | Microchip
MPN: ATMEGA64L-8AI ✓ Hoạt độngATMEGA64L-8AI Tóm tắt
An AVR microcontroller is a Harvard-architecture 8-bit RISC device that executes most instructions in a single clock cycle from on-chip Flash memory. Within the product hierarchy, the ATmega64L sits under 8-bit AVR microcontrollers, which belong to the broader microcontroller (MCU) family, itself a subset of embedded processors and integrated circuits. The 'L' suffix denotes the low-voltage 2.7-5.5 V variant, while the '8' indicates the 8 MHz maximum clock, making it the low-power member of the ATmega64 family.
Key differentiators include 64 KB self-programming Flash with 10,000 write/erase cycles, 4 KB internal SRAM, 2 KB EEPROM with 100,000 write cycles, and a rich peripheral set: two USARTs, master/slave SPI, byte-oriented two-wire serial interface (I2C), and an 8-channel 10-bit successive-approximation ADC. The device also provides a programmable watchdog timer, brown-out detection, power-on reset, and six sleep modes for battery-powered designs.
The ATmega64L is architecturally identical to the ATmega64 but specified for 8 MHz at 2.7 V, whereas the standard ATmega64 runs to 16 MHz at 4.5 V. The ATmega64 is 100% pin compatible with the legacy ATmega103, allowing direct replacement on existing printed circuit boards, and Microchip application notes cover migration between ATmega64 and ATmega128.
Typical applications include industrial control and factory automation nodes, portable battery-powered instruments, medical monitoring devices, building automation and smart-home controllers, motor control front-ends, and legacy ATmega103 board upgrades. The 53 I/O lines and dual USARTs suit multi-sensor gateways, while the 2.7 V minimum supply supports 3.3 V and 5 V mixed logic systems.
A key design consideration is that the 8 MHz rating applies only down to 2.7 V; at 4.5-5.5 V the same silicon can be clocked faster, so verify the frequency/voltage curve before overclocking. Decouple every VCC pin with 100 nF ceramic capacitors and provide a clean analog supply for AVCC to preserve ADC accuracy.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for procurement and layout decisions.
Bộ thay thế dễ dàng lắp đặt cho ATMEGA64L-8AI — 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 ATMEGA64L-8AI (cùng hình factor và footprint) — khác nhau ở ADC, Package, EEPROM, Communication Interfaces, Operating Voltage.
ATMEGA64L-8AU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA64-16AU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA64A-AUR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA64A-AUR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA64L-8AUR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA64-16AUR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA64L-8AI Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit AVR RISC |
| Program Memory | 64 KB self-programming Flash |
| Flash Endurance | 10,000 write/erase cycles |
| SRAM | 4 KB |
| EEPROM | 2 KB (100,000 write cycles) |
| Tần số xung maksimum | 8 MHz |
| Throughput | Up to 8 MIPS at 8 MHz |
| Operating Voltage | 2.7 V to 5.5 V |
| Nhiệt độ hoạt động | -40C to +85C |
| Hộp | 64-TQFP (14x14 mm) |
| Kiểu lắp đặt | Surface Mount |
| I/O Lines | 53 |
| ADC | 8-channel 10-bit successive approximation |
| Interfaces | 2x USART, SPI, I2C (TWI) |
| Debug Interface | JTAG (IEEE 1149.1) |
| Timers | 2x 8-bit, 2x 16-bit |
| PWM Channels | 8 |
| Instruction Set | 130 powerful instructions, most single-clock |
| General Purpose Registers | 32 x 8-bit |
| Trạng thái RoHS | Compliant |
Cấu hình chân ATMEGA64L-8AI
| Chân 1 | PE6/RXD0/INT6 — Port E bit 6 / USART0 receive / external interrupt 6 |
| Chân 2 | PE7/TXD0/INT7 — Port E bit 7 / USART0 transmit / external interrupt 7 |
| Chân 3 | PB0/SS/SCK — Port B bit 0 / SPI slave select / SPI clock |
| Chân 4 | PB1/SCK — Port B bit 1 / SPI clock |
| Chân 5 | PB2/MOSI — Port B bit 2 / SPI master-out slave-in |
| Chân 6 | PB3/MISO — Port B bit 3 / SPI master-in slave-out |
| Chân 7 | PB4/OC0 — Port B bit 4 / timer 0 output compare |
| Chân 8 | PB5/OC1A — Port B bit 5 / timer 1 output compare A |
| Chân 9 | PB6/OC1B — Port B bit 6 / timer 1 output compare B |
| Chân 10 | PB7/OC2/OC1C — Port B bit 7 / timer 2 and timer 1 output compare |
| Chân 11 | TOSC2/PB7 — Timer oscillator pin 2 (crystal) |
| Chân 12 | TOSC1/PB6 — Timer oscillator pin 1 (crystal) |
| Chân 13 | XTAL2 — Inverting oscillator amplifier output |
| Chân 14 | XTAL1 — Inverting oscillator amplifier input |
| Chân 15 | RESET — Reset input (active low) |
| Chân 16 | VCC — Digital supply voltage |
| Chân 17 | GND — Ground |
| Chân 18 | PD0/SCL/INT0 — Port D bit 0 / I2C clock / external interrupt 0 |
| Chân 19 | PD1/SDA/INT1 — Port D bit 1 / I2C data / external interrupt 1 |
| Chân 20 | PD2/RXD1/INT2 — Port D bit 2 / USART1 receive / external interrupt 2 |
| Chân 21 | PD3/TXD1/INT3 — Port D bit 3 / USART1 transmit / external interrupt 3 |
| Chân 22 | PD4/IC1 — Port D bit 4 / timer 1 input capture |
| Chân 23 | PD5/XCK1 — Port D bit 5 / USART1 external clock |
| Chân 24 | PD6/T1 — Port D bit 6 / timer 1 counter input |
| Chân 25 | PD7/T2 — Port D bit 7 / timer 2 counter input |
| Chân 26 | PC0/A8 — Port C bit 0 / external memory address 8 |
| Chân 27 | PC1/A9 — Port C bit 1 / external memory address 9 |
| Chân 28 | PC2/A10 — Port C bit 2 / external memory address 10 |
| Chân 29 | PC3/A11 — Port C bit 3 / external memory address 11 |
| Chân 30 | PC4/A12 — Port C bit 4 / external memory address 12 |
| Chân 31 | PC5/A13 — Port C bit 5 / external memory address 13 |
| Chân 32 | PC6/A14 — Port C bit 6 / external memory address 14 |
| Chân 33 | PC7/A15 — Port C bit 7 / external memory address 15 |
| Chân 34 | VCC — Digital supply voltage |
| Chân 35 | GND — Ground |
| Chân 36 | PA7/AD7 — Port A bit 7 / external memory data 7 |
| Chân 37 | PA6/AD6 — Port A bit 6 / external memory data 6 |
| Chân 38 | PA5/AD5 — Port A bit 5 / external memory data 5 |
| Chân 39 | PA4/AD4 — Port A bit 4 / external memory data 4 |
| Chân 40 | PA3/AD3 — Port A bit 3 / external memory data 3 |
| Chân 41 | PA2/AD2 — Port A bit 2 / external memory data 2 |
| Chân 42 | PA1/AD1 — Port A bit 1 / external memory data 1 |
| Chân 43 | PA0/AD0 — Port A bit 0 / external memory data 0 |
| Chân 44 | VCC — Digital supply voltage |
| Chân 45 | GND — Ground |
| Chân 46 | AREF — Analog reference voltage for ADC |
| Chân 47 | AVCC — Analog supply voltage for ADC |
| Chân 48 | PF7/ADC7/TDI — Port F bit 7 / ADC channel 7 / JTAG test data in |
| Chân 49 | PF6/ADC6/TDO — Port F bit 6 / ADC channel 6 / JTAG test data out |
| Chân 50 | PF5/ADC5/TMS — Port F bit 5 / ADC channel 5 / JTAG test mode select |
| Chân 51 | PF4/ADC4/TCK — Port F bit 4 / ADC channel 4 / JTAG test clock |
| Chân 52 | PF3/ADC3 — Port F bit 3 / ADC channel 3 |
| Chân 53 | PF2/ADC2 — Port F bit 2 / ADC channel 2 |
| Chân 54 | PF1/ADC1 — Port F bit 1 / ADC channel 1 |
| Chân 55 | PF0/ADC0 — Port F bit 0 / ADC channel 0 |
| Chân 56 | GND — Ground |
| Chân 57 | VCC — Digital supply voltage |
| Chân 58 | PG5/OC0B — Port G bit 5 / timer 0 output compare B |
| Chân 59 | PG4/OC0A — Port G bit 4 / timer 0 output compare A |
| Chân 60 | PG3/TOSC2 — Port G bit 3 / timer oscillator pin 2 |
| Chân 61 | PG2/TOSC1 — Port G bit 2 / timer oscillator pin 1 |
| Chân 62 | PG1/RD — Port G bit 1 / external memory read strobe |
| Chân 63 | PG0/WR — Port G bit 0 / external memory write strobe |
| Chân 64 | PE0/RXD0/INT8 — Port E bit 0 / USART0 receive / external interrupt 8 |
Ứng dụng tiêu biểu
ATMEGA64L-8AI phù hợp cho 6 Áp dụngs: Industrial Control and Factory Automation, Portable Battery-Powered Instruments, Medical Monitoring Devices, Building Automation and Smart Home Controllers, Motor Control Front-Ends, Legacy ATmega103 Board Upgrades.
Industrial Control and Factory Automation
The ATMEGA64L-8AI fits industrial control nodes because its 53 I/O lines, dual USARTs, and 8-channel 10-bit ADC can directly interface with sensors, relays, and fieldbus transceivers without external glue logic. Operating from 2.7 V to 5.5 V and rated -40C to +85C, it tolerates the wide supply and temperature swings of factory floors. In a typical node, the MCU samples analog process signals through the ADC, runs a control loop, and reports over RS-485 via a USART, while the 2 KB EEPROM stores calibration constants that survive power cycles. The trade-off is throughput: at 8 MHz the device delivers 8 MIPS, so compute-heavy motion control may need the 16 MHz ATMEGA64-16AU instead, which is pin compatible but requires at least 4.5 V.
Được đề xuất
Portable Battery-Powered Instruments
The ATMEGA64L-8AI suits portable instruments because it operates down to 2.7 V, allowing direct connection to a single Li-ion cell or a 3-cell NiMH pack without a boost converter. Six sleep modes, a programmable watchdog timer, and brown-out detection let firmware trade active time for battery life, while the 64 KB Flash holds measurement algorithms and the 2 KB EEPROM logs calibration data. A handheld data logger might wake on a timer, sample the 10-bit ADC, store readings in 4 KB SRAM, and sleep again, drawing only microamps between bursts. The design consideration is clock accuracy: the internal RC oscillator is adequate for timing-insensitive tasks, but a crystal on the TOSC pins is needed when UART baud rates or real-time clocks must stay precise across temperature.
Được đề xuất
Medical Monitoring Devices
The ATMEGA64L-8AI is used in medical monitoring front-ends where its 8-channel 10-bit ADC digitizes signals such as temperature, pressure, or pulse waveforms, and the dual USARTs stream results to a host or display module. The 2.7-5.5 V supply range supports both 3.3 V and 5 V analog rails, and the -40C to +85C rating covers clinical and home-health environments. In a patient monitor, the MCU runs an anti-aliasing filter loop, averages ADC samples in SRAM, and flags out-of-range values through a GPIO interrupt, while the watchdog timer forces recovery from firmware lockups. Because the ADC shares the AVCC supply, designers must decouple AVCC with a dedicated 100 nF capacitor and a ferrite bead to keep digital switching noise out of the measurement path.
Được đề xuất
Building Automation and Smart Home Controllers
The ATMEGA64L-8AI serves building automation controllers that bridge sensors, actuators, and a network gateway. Its I2C (TWI) interface connects to temperature and humidity sensors, SPI drives external radio or memory modules, and the two USARTs link to a host gateway or a legacy RS-485 bus. With 53 I/O lines, a single MCU can manage multiple relay outputs and wall-switch inputs without port expanders, and the 2 KB EEPROM stores network addresses and scene configurations. The 8 MHz clock is sufficient for polling loops and simple control logic, but the design must budget Flash carefully: 64 KB fills quickly once a communication stack and OTA update routines are added, so the 4 KB SRAM should be reserved for packet buffers rather than large application arrays.
Được đề xuất
Motor Control Front-Ends
The ATMEGA64L-8AI can act as a motor control front-end, generating PWM through its 8 PWM channels and reading position or current feedback on the 10-bit ADC. Two 16-bit timers provide the high-resolution PWM needed for smooth commutation, while the analog comparator and interrupt system enable fast overcurrent shutdown without CPU polling. In a brushed-DC or stepper controller, the MCU runs a PID loop at the PWM frequency, updates duty cycle registers, and reports status over a USART. The key trade-off is computational headroom: an 8 MHz AVR executes roughly 8 MIPS, which limits field-oriented control of three-phase motors, so designers typically pair the ATMEGA64L-8AI with an external gate driver and keep the control loop simple, or step up to the 16 MHz ATMEGA64-16AU for higher loop rates.
Được đề xuất
Legacy ATmega103 Board Upgrades
The ATMEGA64L-8AI is a direct upgrade path for legacy ATmega103 designs because the ATmega64 family is 100% pin compatible with the ATmega103 and can replace it on existing printed circuit boards. Engineers migrating an old board gain 64 KB Flash, 4 KB SRAM, and 2 KB EEPROM in place of the ATmega103's smaller memory, plus JTAG debug that the older device lacked. Microchip application notes 'Replacing ATmega103 by ATmega128' and 'Migration between ATmega64 and ATmega128' document the firmware changes required, mainly register and interrupt-vector differences. The design consideration is voltage: if the legacy board runs at 5 V, the ATMEGA64L-8AI operates comfortably, but if it runs at 3.3 V, verify that the 8 MHz rating still meets timing margins for any external peripherals.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATMEGA64L-8AI — 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 | ATMEGA64L-8AU | ATMEGA64-16AU | ATMEGA64A-AU | ATMEGA64L-8AUR |
|---|---|---|---|---|---|
| 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 |
| Maximum Clock Frequency | 8 MHz | 8 MHz | 16 MHz | 16 MHz | 8 MHz |
| Operating Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| I/O Lines | 53 | 53 | 53 | 53 | 53 |
| ADC | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Bảo phân biệt quan trọng
- Low-voltage operation down to 2.7 V (vsATMEGA64-16AU)
- 8 MHz rating guaranteed across full voltage range (vsATMEGA64A-AU)
- Pin-compatible with legacy ATmega103 (vsATMEGA64L-8AU)
- Integrated 2 KB EEPROM for calibration storage (vsATMEGA64-16AU)
Ghi chú thiết kế
Decouple every VCC pin (pins 16, 34, 44, 57) with a 100 nF ceramic capacitor placed within 5 mm of the pin, and add a 10 uF bulk capacitor near the package. Supply AVCC (pin 47) through a separate ferrite bead or 10 ohm resistor with its own 100 nF capacitor to isolate ADC noise from digital switching. AREF (pin 46) should be bypassed with 100 nF to GND when using the internal reference, or driven from a low-impedance external reference for ratiometric measurements.
Route the crystal between XTAL1 (pin 14) and XTAL2 (pin 13) with traces shorter than 10 mm and guard them with ground. Keep the 22 pF load capacitors' ground returns directly to the MCU GND pins rather than to a shared analog ground plane. For the 64-TQFP package, use a thermal-relief-free ground pour under the device and connect all GND pins (17, 35, 45, 56) with short vias to the ground plane to minimize inductive bounce during ADC conversions.
The 8 MHz maximum frequency of the ATMEGA64L-8AI is guaranteed only across 2.7-5.5 V; do not assume the part can be overclocked at 5 V without checking the frequency-versus-voltage curve in the Microchip ATmega64/L datasheet. Also verify that the RESET pin (15) has an external pull-up of 10 kohm to VCC and a 100 nF capacitor to GND, since floating RESET can cause spurious resets in noisy industrial environments. Finally, confirm the JTAG fuse is disabled in production to free PF4-PF7 as ADC inputs.
Thông tin tuân thủ
RoHS compliance and lead-free status are indicated by distributor listings for the ATMEGA64L-8AI. REACH, halogen-free, and conflict-minerals status were not stated in the provided web data and are marked unknown. The device is not AEC-Q100 qualified; it is rated for the industrial temperature range -40C to +85C.
