ATMEGA64L-8AQ - 8-Bit AVR MCU, 64KB Flash, 8MHz TQFP-64 | Microchip
MPN: ATMEGA64L-8AQ ✗ סוף ייצורATMEGA64L-8AQ סקירה
A microcontroller (MCU) integrates a processor core, program memory, data memory, and peripherals on a single chip, forming the lowest level of the embedded-system hierarchy: microcontroller -> embedded processor -> integrated circuit -> semiconductor. AVR is a RISC (reduced instruction set computer) architecture in which most of the 130 powerful instructions execute in a single clock cycle, and 32 x 8-bit general-purpose working registers are directly connected to the ALU, so the ATMEGA64L-8AQ achieves close to 1 MIPS per MHz - roughly 8 MIPS throughput at its maximum 8 MHz clock when powered at 3V (the L suffix, per Microchip data).
Key features include the 64KB self-programming Flash with a boot-loader section for in-system reprogramming, an 8-channel 10-bit ADC for direct analog sensor interface, a JTAG interface for on-chip debugging and boundary scan, two hardware USARTs, SPI, TWI (I2C), three timers with PWM outputs, and an external memory interface allowing expansion of up to 64KB of external SRAM.
Technically, the fully static core lets the clock be stopped without losing register contents, while multiple sleep modes (idle, ADC noise reduction, power-save, standby, extended standby) cut power draw dramatically in battery-operated designs. The self-programming capability enables field firmware updates without an external programmer.
Typical applications include industrial control panels, metering instruments, building automation nodes, and legacy embedded systems that require the proven ATmega64 peripheral set with low-voltage 3V operation.
Design consideration: the L variant is specified for 0-8 MHz at 2.7-5.5V; for new designs Microchip recommends the newer ATmega64A family, as the ATmega64L is a mature, not-recommended-for-new-designs product.
This page synthesizes verified distributor pricing, drop-in alternative cross-references, and practical design notes not found in the manufacturer datasheet.
חלופות תחליף ישיר עבור ATMEGA64L-8AQ — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם ATMEGA64L-8AQ (אותו גורם צורה וטביעת רגל) — שונים ב Package, ADC, EEPROM, Program Memory Size, Timers/Counters.
ATMEGA64A-AUR
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA64L-8AI
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA64-16AU
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA64A-MUR
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA640V-8AU
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA640-16AUR
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA64L-8AQ דירוגים מרביים ומאפיינים חשמליים
| Core Size | 8-Bit |
| Series | AVR ATmega64 |
| תדר שעון מקסימלי | 8 MHz |
| Program Memory Size | 64 KB (32K x 16) Flash |
| EEPROM Size | 2 KB |
| SRAM Size | 4 KB |
| ADC Resolution | 10-bit |
| Number of ADC Channels | 8 |
| Core Architecture | AVR RISC, 130 instructions |
| General Purpose Registers | 32 x 8 |
| Debug Interface | JTAG (on-chip debug, boundary scan) |
| Communication Interfaces | 2x USART, SPI, TWI (I2C) |
| Operating Voltage | 2.7 V to 5.5 V (L grade) |
| טמפרטורת פעולה | -40C to +85C |
| מארז | 64-TQFP (14x14 mm) |
| סוג הרכבה | Surface Mount |
| Life Cycle | Mature; not recommended for new designs (replaced by ATmega64A) |
תצורת פינים של ATMEGA64L-8AQ
| פין 1 | PEN — Programming enable (serial programming) |
| פין 2 | PE0 — USART0 receive (RXD0) |
| פין 3 | PE1 — USART0 transmit (TXD0) |
| פין 4 | PE2 — USART0 clock (XCK0) / analog comparator input AIN0 |
| פין 5 | PE3 — Timer3 output compare A (OC3A) / AIN1 |
| פין 6 | PE4 — Timer3 output compare B (OC3B) / external interrupt INT4 |
| פין 7 | PE5 — Timer3 output compare C (OC3C) / external interrupt INT5 |
| פין 8 | PE6 — Timer3 clock input (T3) / external interrupt INT6 |
| פין 9 | PE7 — Timer3 input capture (ICP3) / clock output (CLKO) / INT7 |
| פין 10 | VCC — Digital supply voltage |
| פין 11 | GND — Digital ground |
| פין 12 | PG0 — External memory write strobe (WR) |
| פין 13 | PG1 — External memory read strobe (RD) |
| פין 14 | PC0 — External memory address line A8 / GPIO |
| פין 15 | PC1 — External memory address line A9 / GPIO |
| פין 16 | PC2 — External memory address line A10 / GPIO |
| פין 17 | PC3 — External memory address line A11 / GPIO |
| פין 18 | PC4 — External memory address line A12 / GPIO |
| פין 19 | PC5 — External memory address line A13 / GPIO |
| פין 20 | PC6 — External memory address line A14 / GPIO |
| פין 21 | PC7 — External memory address line A15 (TOSC2) / GPIO |
| פין 22 | AREF — ADC reference voltage |
| פין 23 | AGND — Analog ground |
| פין 24 | PF0 — ADC input channel 0 (ADC0) / GPIO |
| פין 25 | PF1 — ADC input channel 1 (ADC1) / GPIO |
| פין 26 | PF2 — ADC input channel 2 (ADC2) / GPIO |
| פין 27 | PF3 — ADC input channel 3 (ADC3) / GPIO |
| פין 28 | PF4 — ADC input channel 4 (ADC4) / JTAG test clock (TCK) |
| פין 29 | PF5 — ADC input channel 5 (ADC5) / JTAG test mode select (TMS) |
| פין 30 | PF6 — ADC input channel 6 (ADC6) / JTAG test data out (TDO) |
| פין 31 | PF7 — ADC input channel 7 (ADC7) / JTAG test data in (TDI) |
| פין 32 | GND — Ground |
| פין 33 | VCC — Supply voltage |
| פין 34 | PA0 — ADC0 / external memory address/data line AD0 / GPIO |
| פין 35 | PA1 — ADC1 / external memory address/data line AD1 / GPIO |
| פין 36 | PA2 — ADC2 / external memory address/data line AD2 / GPIO |
| פין 37 | PA3 — ADC3 / external memory address/data line AD3 / GPIO |
| פין 38 | PA4 — ADC4 / external memory address/data line AD4 / GPIO |
| פין 39 | PA5 — ADC5 / external memory address/data line AD5 / GPIO |
| פין 40 | PA6 — ADC6 / external memory address/data line AD6 / GPIO |
| פין 41 | PA7 — ADC7 / external memory address/data line AD7 / GPIO |
| פין 42 | PB0 — SPI slave select (SS) / GPIO |
| פין 43 | PB1 — SPI clock (SCK) / GPIO |
| פין 44 | PB2 — SPI master out slave in (MOSI) / GPIO |
| פין 45 | PB3 — SPI master in slave out (MISO) / GPIO |
| פין 46 | PB4 — Timer0 output compare (OC0) / PWM / GPIO |
| פין 47 | PB5 — Timer1 output compare A (OC1A) / PWM / GPIO |
| פין 48 | PB6 — Timer1 output compare B (OC1B) / PWM / GPIO |
| פין 49 | PB7 — Timer2 output compare (OC2) / Timer1 output compare C (OC1C) / GPIO |
| פין 50 | PD0 — USART1 receive (RXD1) / external interrupt INT0 / GPIO |
| פין 51 | PD1 — USART1 transmit (TXD1) / external interrupt INT1 / GPIO |
| פין 52 | PD2 — External interrupt INT2 (serial data in SDA) / GPIO |
| פין 53 | PD3 — External interrupt INT3 (serial clock SCL) / GPIO |
| פין 54 | PD4 — USART1 external clock (XCK1) / Timer1 input capture (ICP1) / GPIO |
| פין 55 | PD5 — Timer1 external clock (T1) / GPIO |
| פין 56 | PD6 — Timer1 input capture (ICP1) / GPIO |
| פין 57 | PD7 — Timer2 output compare (OC2) / GPIO |
| פין 58 | RESET — Reset input (active low) |
| פין 59 | VCC — Supply voltage |
| פין 60 | GND — Ground |
| פין 61 | XTAL2 — Inverting oscillator output |
| פין 62 | XTAL1 — Inverting oscillator input / external clock input |
| פין 63 | PG2 — External memory address latch enable (ALE0) / GPIO |
| פין 64 | PG3 — External memory address latch enable (ALE1) / GPIO |
יישומים טיפוסיים
ATMEGA64L-8AQ מתאים עבור 6 יישוםs: Industrial Control and Automation, Metering and Measurement Instruments, Building Automation Nodes, Legacy Embedded System Maintenance, Motor Control and PWM Drive, Human-Machine Interface Panels.
Industrial Control and Automation
The ATMEGA64L-8AQ fits industrial control panels and machine controllers because it combines an external memory interface, two hardware USARTs for Modbus-style RS-485 links, and a JTAG port for field diagnostics in one 64-TQFP device. Its 8-channel 10-bit ADC reads analog setpoint potentiometers and sensor loops directly, while Timer PWM outputs drive actuators and heater control. The -40C to +85C industrial temperature range covers unconditioned cabinets, and the fully static core tolerates clock gating for low standby power between production cycles. Placed on a 5V industrial rail with 0.1uF local decoupling, it runs reliably at its 8 MHz maximum with approximately 8 MIPS throughput, sufficient for sequential control logic, PID loops at low sample rates, and HMI button/LED scanning.
מומלץ
Metering and Measurement Instruments
Energy meters, bench instruments, and data loggers benefit from the ATMEGA64L-8AQ's 8-channel 10-bit ADC with an internal reference option and 15 kSPS-class sampling, which directly digitizes voltage/current sense networks without an external converter. The 2KB EEPROM retains calibration constants and accumulated register values through power cycles, and the self-programming 64KB Flash allows remote firmware/calibration-table updates via bootloader. The L-grade 2.7V minimum supply supports battery-backup operation of the metering front end. Typical circuit: sense dividers into ADC0-ADC3, a USART line to the billing head, and SPI to an external EEPROM or display driver. JTAG-based boundary scan eases production test of the dense analog/digital mixed board.
מומלץ
Building Automation Nodes
Room controllers, damper actuators, and access-control nodes use the ATMEGA64L-8AQ's TWI (I2C) interface to aggregate temperature and humidity sensors while its second USART handles RS-485 trunk communication. The 4KB SRAM comfortably buffers protocol stacks such as lightweight BACnet or Modbus RTU implementations, and 64KB Flash hosts the application plus bootloader for network firmware updates. Multiple sleep modes, including power-save with a 32.768 kHz TOSC crystal on the TOSC pins, let the node idle at microamp-level current between scheduled actions - important for battery-hybrid powered nodes. The 64-TQFP provides enough GPIO (53 I/O) to drive relays, LEDs, and keypads without port expanders, reducing BOM cost per node.
מומלץ
Legacy Embedded System Maintenance
The primary ongoing role of the ATMEGA64L-8AQ is sustaining existing product lines whose firmware and PCBs were validated around the ATmega64L die. Because the part is marked mature/not-recommended-for-new-designs by Microchip, maintenance engineers should qualify the ATMEGA64A-AUR drop-in successor and stock bridging quantities of the original. The identical 64-TQFP footprint means no PCB respin, and AVR object compatibility means firmware compiles with the same AVR-GCC/AVR Studio toolchain. For critical spares procurement, verify date codes and buy from authorized distributors to avoid recycled or remarked parts, which are a known counterfeit risk on mature Atmel-family MCUs.
מומלץ
Motor Control and PWM Drive
Small motor drives - DC fan controllers, stepper drivers, and BLDC commutation prototypes - leverage the ATmega64L's three timers producing multiple hardware PWM channels (OC0, OC1A/1B/1C, OC2, OC3A/3B/3C) with complementary control granularity. The 8-channel ADC supports speed-setting inputs and back-EMF or current-shunt feedback with the ADC noise-reduction sleep mode reducing conversion jitter. The 8 MHz L-grade clock is adequate for sensorless BLDC at low-to-medium mechanical speeds, and the JTAG interface permits cycle-accurate debugging of commutation interrupt routines, which is invaluable when tuning phase timing. Gate-driver inputs connect directly to PWM output pins through level-shifting if the power stage runs above 5V logic.
מומלץ
Human-Machine Interface Panels
Operator panels with keypads and character or graphic displays exploit the ATMEGA64L-8AQ's large GPIO count (53 programmable I/O lines) in the compact 64-TQFP (14x14 mm) footprint. A matrix keypad scans on port pins, SPI drives LCD controllers or LED column drivers, and TWI reads capacitive-touch or real-time-clock peripherals. The 64KB Flash accommodates multi-language string tables and font bitmaps, which is often the flash bottleneck on smaller ATmega parts. Because the L-grade part runs from 2.7V, it can share a 3.3V rail with common LCD and RTC peripherals without level shifting - simplifying the board. Power-save sleep with keypad-interrupt wake keeps panel standby current low for always-on installations.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ATMEGA64L-8AQ — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | ATMEGA64A-AUR | ATMEGA64L-8AI | ATMEGA64-16AU | ATMEGA640V-8AU |
|---|---|---|---|---|---|
| Package | 64-TQFP (14x14 mm) | 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 |
| Max Clock Frequency | 8 MHz | 16 MHz | 8 MHz | 16 MHz | 8 MHz |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB | 8 KB |
| USART Count | 2 | 2 | 2 | 2 | 4 |
| Lifecycle Status | Mature / NRND (replaced by ATmega64A) | Active production | Mature / NRND | Mature / NRND | Active production |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
מבדילים עיקריים
- Low-voltage 8 MHz operation down to 2.7V (לעומתATMEGA64-16AU)
- Active-production successor available pin-to-pin (לעומתATMEGA64A-AUR)
- Simplest peripheral set of the 64-pin family (לעומתATMEGA640V-8AU)
הערות תכנון
The ATMEGA64L-8AQ is an L-grade device specified from 2.7V to 5.5V at up to 8 MHz across the full industrial range. Unlike the 16 MHz ATmega64 variants, which need 4.5V minimum at top speed, this part meets 8 MHz at any voltage in range - useful for 3.3V designs sharing rails with LCDs and sensors. Decouple every VCC pin (pins 10, 33, 59) and AVCC with 0.1uF ceramics placed within 5 mm of each pin, and connect AGND (pin 23) to a quiet analog ground island for best ADC accuracy.
The 64-TQFP (14x14 mm) has 0.5 mm pitch leads; specify a footprint with slightly elongated pads for solder-joint inspection and route a solid ground plane under the device. If using the external memory interface (PA0-7 as AD bus, PC0-7 as A8-A15, PG0/PG1 as WR/RD with ALE on PG2/PG3), keep bus traces short and matched in length where possible, and add series termination of 22-33 ohm on high-speed ALE lines to suppress ringing. JTAG (PF4-PF7) should have a header on the board for production debugging even if unused in the final application.
This part is officially mature/not-recommended-for-new-designs and replaced by ATmega64A - starting a new design on ATMEGA64L-8AQ creates lifecycle risk. Second, the PEN pin (pin 1) must not be left floating if low-voltage serial programming is used; pull it per datasheet guidance. Third, the L suffix limits the clock to 8 MHz - firmware written for a 16 MHz ATmega64 will run at half speed if the fuse settings and F_CPU constant are not adjusted. Finally, verify EEPROM write endurance budgeting (100k cycles) in logging applications.
מידע על תאימות
RoHS-compliant per Microchip product data for the AQ suffix (RoHS-compliant packaging code). Additional REACH/halogen status not stated in provided data.
