ATMEGA64L-8AQ - 8-Bit AVR MCU, 64KB Flash, 8MHz TQFP-64 | Microchip
Référence : ATMEGA64L-8AQ ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $10.68 | $10,68 |
| 10 | $9.9 | $99,00 |
| 100 | $8.95 | $895,00 |
| 500 | $8.2 | $4 100,00 |
| 1 000 | $7.5 | $7 500,00 |
ATMEGA64L-8AQ Présentation
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.
Alternatives de remplacement direct pour ATMEGA64L-8AQ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ATMEGA64L-8AQ (même facteur de forme et même empreinte) — différant par Package, ADC, EEPROM, Program Memory Size, Timers/Counters.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA64A-AUR
✅ Remplacement direct✓ En stock
$4.1 / unité
Voir la fiche technique →ATMEGA64L-8AI
✅ Remplacement direct✓ En stock
$6.7 / unité
Voir la fiche technique →ATMEGA64-16AU
✅ Remplacement direct✓ En stock
$7.23 / unité
Voir la fiche technique →ATMEGA64A-MUR
✅ Remplacement direct✓ En stock
$4.42 / unité
Voir la fiche technique →ATMEGA640V-8AU
✅ Remplacement direct✓ En stock
$3.95 / unité
Voir la fiche technique →ATMEGA640-16AUR
✅ Remplacement direct✓ En stock
$6.2 / unité
Voir la fiche technique →ATMEGA64L-8AQ Valeurs maximales et caractéristiques électriques
| Core Size | 8-Bit |
| Series | AVR ATmega64 |
| Fréquence d'horloge maximale | 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) |
| Température de fonctionnement | -40C to +85C |
| Boîtier | 64-TQFP (14x14 mm) |
| Type de montage | Surface Mount |
| Life Cycle | Mature; not recommended for new designs (replaced by ATmega64A) |
Configuration des broches de ATMEGA64L-8AQ
| Broche 1 | PEN — Programming enable (serial programming) |
| Broche 2 | PE0 — USART0 receive (RXD0) |
| Broche 3 | PE1 — USART0 transmit (TXD0) |
| Broche 4 | PE2 — USART0 clock (XCK0) / analog comparator input AIN0 |
| Broche 5 | PE3 — Timer3 output compare A (OC3A) / AIN1 |
| Broche 6 | PE4 — Timer3 output compare B (OC3B) / external interrupt INT4 |
| Broche 7 | PE5 — Timer3 output compare C (OC3C) / external interrupt INT5 |
| Broche 8 | PE6 — Timer3 clock input (T3) / external interrupt INT6 |
| Broche 9 | PE7 — Timer3 input capture (ICP3) / clock output (CLKO) / INT7 |
| Broche 10 | VCC — Digital supply voltage |
| Broche 11 | GND — Digital ground |
| Broche 12 | PG0 — External memory write strobe (WR) |
| Broche 13 | PG1 — External memory read strobe (RD) |
| Broche 14 | PC0 — External memory address line A8 / GPIO |
| Broche 15 | PC1 — External memory address line A9 / GPIO |
| Broche 16 | PC2 — External memory address line A10 / GPIO |
| Broche 17 | PC3 — External memory address line A11 / GPIO |
| Broche 18 | PC4 — External memory address line A12 / GPIO |
| Broche 19 | PC5 — External memory address line A13 / GPIO |
| Broche 20 | PC6 — External memory address line A14 / GPIO |
| Broche 21 | PC7 — External memory address line A15 (TOSC2) / GPIO |
| Broche 22 | AREF — ADC reference voltage |
| Broche 23 | AGND — Analog ground |
| Broche 24 | PF0 — ADC input channel 0 (ADC0) / GPIO |
| Broche 25 | PF1 — ADC input channel 1 (ADC1) / GPIO |
| Broche 26 | PF2 — ADC input channel 2 (ADC2) / GPIO |
| Broche 27 | PF3 — ADC input channel 3 (ADC3) / GPIO |
| Broche 28 | PF4 — ADC input channel 4 (ADC4) / JTAG test clock (TCK) |
| Broche 29 | PF5 — ADC input channel 5 (ADC5) / JTAG test mode select (TMS) |
| Broche 30 | PF6 — ADC input channel 6 (ADC6) / JTAG test data out (TDO) |
| Broche 31 | PF7 — ADC input channel 7 (ADC7) / JTAG test data in (TDI) |
| Broche 32 | GND — Ground |
| Broche 33 | VCC — Supply voltage |
| Broche 34 | PA0 — ADC0 / external memory address/data line AD0 / GPIO |
| Broche 35 | PA1 — ADC1 / external memory address/data line AD1 / GPIO |
| Broche 36 | PA2 — ADC2 / external memory address/data line AD2 / GPIO |
| Broche 37 | PA3 — ADC3 / external memory address/data line AD3 / GPIO |
| Broche 38 | PA4 — ADC4 / external memory address/data line AD4 / GPIO |
| Broche 39 | PA5 — ADC5 / external memory address/data line AD5 / GPIO |
| Broche 40 | PA6 — ADC6 / external memory address/data line AD6 / GPIO |
| Broche 41 | PA7 — ADC7 / external memory address/data line AD7 / GPIO |
| Broche 42 | PB0 — SPI slave select (SS) / GPIO |
| Broche 43 | PB1 — SPI clock (SCK) / GPIO |
| Broche 44 | PB2 — SPI master out slave in (MOSI) / GPIO |
| Broche 45 | PB3 — SPI master in slave out (MISO) / GPIO |
| Broche 46 | PB4 — Timer0 output compare (OC0) / PWM / GPIO |
| Broche 47 | PB5 — Timer1 output compare A (OC1A) / PWM / GPIO |
| Broche 48 | PB6 — Timer1 output compare B (OC1B) / PWM / GPIO |
| Broche 49 | PB7 — Timer2 output compare (OC2) / Timer1 output compare C (OC1C) / GPIO |
| Broche 50 | PD0 — USART1 receive (RXD1) / external interrupt INT0 / GPIO |
| Broche 51 | PD1 — USART1 transmit (TXD1) / external interrupt INT1 / GPIO |
| Broche 52 | PD2 — External interrupt INT2 (serial data in SDA) / GPIO |
| Broche 53 | PD3 — External interrupt INT3 (serial clock SCL) / GPIO |
| Broche 54 | PD4 — USART1 external clock (XCK1) / Timer1 input capture (ICP1) / GPIO |
| Broche 55 | PD5 — Timer1 external clock (T1) / GPIO |
| Broche 56 | PD6 — Timer1 input capture (ICP1) / GPIO |
| Broche 57 | PD7 — Timer2 output compare (OC2) / GPIO |
| Broche 58 | RESET — Reset input (active low) |
| Broche 59 | VCC — Supply voltage |
| Broche 60 | GND — Ground |
| Broche 61 | XTAL2 — Inverting oscillator output |
| Broche 62 | XTAL1 — Inverting oscillator input / external clock input |
| Broche 63 | PG2 — External memory address latch enable (ALE0) / GPIO |
| Broche 64 | PG3 — External memory address latch enable (ALE1) / GPIO |
Applications typiques
ATMEGA64L-8AQ convient pour 6 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA64L-8AQ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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 |
Principaux différenciateurs
- Low-voltage 8 MHz operation down to 2.7V (vs ATMEGA64-16AU)
- Active-production successor available pin-to-pin (vs ATMEGA64A-AUR)
- Simplest peripheral set of the 64-pin family (vs ATMEGA640V-8AU)
Notes de conception
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.
Informations de conformité
RoHS-compliant per Microchip product data for the AQ suffix (RoHS-compliant packaging code). Additional REACH/halogen status not stated in provided data.
