ATMEGA64L-8AU - 8-bit AVR MCU, 64KB Flash, 8MHz | Microchip
N.º da peça: ATMEGA64L-8AU ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $7.2 | $7,20 |
| 10 | $6.48 | $64,80 |
| 100 | $5.72 | $572,00 |
| 500 | $5.1 | $2.550,00 |
| 1.000 | $4.55 | $4.550,00 |
ATMEGA64L-8AU Visão geral
An 8-bit microcontroller (MCU) is a self-contained computing device integrating a processor core, memory, and peripherals such as timers, serial interfaces, and ADCs onto a single chip. MCUs sit at the heart of embedded systems, forming the control layer beneath SoCs and processors in the broader semiconductor hierarchy, and execute real-time control loops in industrial, automotive, and consumer products.
Key features of the ATMEGA64L-8AU include 64KB Flash with Read-While-Write capability, an 8-channel 10-bit ADC, four flexible Timer/Counters with compare modes and PWM, two USARTs, a byte-oriented Two-Wire Interface (TWI/I2C), and a Serial Peripheral Interface (SPI). The AVR core executes 130 powerful instructions, most in a single clock cycle, with 32 x 8-bit general-purpose working registers.
Technically, the fully static CMOS core supports low idle and power-down sleep modes, a Real Time Counter with separate oscillator for RTC operation, and a JTAG (IEEE 1149.1 compliant) boundary-scan and on-chip debugging interface. In-system programmability via SPI allows firmware updates without removing the device from the PCB.
Typical applications include industrial control panels, building automation and HVAC controllers, instrumentation front ends using the 10-bit ADC, and legacy embedded systems originally designed around the pin-compatible ATmega103.
Design consideration: choose the L speed grade (8MHz, 2.7-5.5V) only for designs clocked at or below 8MHz; the ATmega64/ATmega64A standard grade is required for 16MHz operation at 5V.
Note: Microchip lists the ATmega64 as a mature product not recommended for new designs, replaced by the ATmega64A. This page synthesizes distributor availability, pin-compatible alternatives, and design notes not found in the manufacturer datasheet.
Alternativas drop-in para ATMEGA64L-8AU — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com ATMEGA64L-8AU (mesmo formato e footprint) — diferindo em Timers/Counters, ADC, Package, EEPROM, Debug Interface.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ATMEGA64L-8AQ
✅ Drop-In✓ Em estoque
$7.5 / unidade
Ver ficha técnica →ATMEGA64A-AUR
✅ Drop-In✓ Em estoque
$4.1 / unidade
Ver ficha técnica →ATMEGA64A-MUR
✅ Drop-In✓ Em estoque
$4.42 / unidade
Ver ficha técnica →ATMEGA64-16AU
✅ Drop-In✓ Em estoque
$7.23 / unidade
Ver ficha técnica →ATMEGA128L-8AU
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$23.49 / unidade
Ver ficha técnica →ATMEGA640V-8AU
✅ Drop-In✓ Em estoque
$3.95 / unidade
Ver ficha técnica →ATMEGA64L-8AU Classificações máximas e características elétricas
| Core Processor | AVR |
| Core Size | 8-Bit |
| Architecture | AVR enhanced RISC, 130 instructions |
| Speed | 8 MHz |
| Flash Memory | 64KB (32K x 16) In-System Programmable |
| EEPROM | 2KB |
| SRAM | 4KB |
| Operating Voltage Range | 2.7 V to 5.5 V |
| General Purpose I/O | 53 lines |
| ADC | 8-channel, 10-bit |
| Timers/Counters | 4 (with compare modes and PWM) |
| USART | 2 |
| Serial Interfaces | TWI (I2C-compatible), SPI, 2x USART |
| JTAG | Yes (boundary scan, on-chip debug) |
| RTC | Real Time Counter with separate oscillator |
| Encapsulamento | 64-TQFP (14x14 mm) |
| Tipo de montagem | Surface Mount |
| Lifecycle Note | Mature product, not recommended for new designs; replaced by ATmega64A |
Configuração de pinos do ATMEGA64L-8AU
| Pino 1 | PE0 — Port E bit 0 / RXD0 (USART0 receive) |
| Pino 2 | PE1 — Port E bit 1 / TXD0 (USART0 transmit) |
| Pino 3 | PE2 — Port E bit 2 / XCK0 / AIN0 |
| Pino 4 | PE3 — Port E bit 3 / OC3A / AIN1 |
| Pino 5 | PE4 — Port E bit 4 / OC3B / INT4 |
| Pino 6 | PE5 — Port E bit 5 / OC3C / INT5 |
| Pino 7 | PE6 — Port E bit 6 / T3 / INT6 |
| Pino 8 | PE7 — Port E bit 7 / ICP3 / INT7 |
| Pino 9 | PB7 — Port B bit 7 / OC2 / OC1C |
| Pino 10 | PB6 — Port B bit 6 / OC1B |
| Pino 11 | PB5 — Port B bit 5 / OC1A |
| Pino 12 | PB4 — Port B bit 4 / OC0 |
| Pino 13 | PB3 — Port B bit 3 / MISO (SPI) |
| Pino 14 | PB2 — Port B bit 2 / MOSI (SPI) |
| Pino 15 | PB1 — Port B bit 1 / SCK (SPI) |
| Pino 16 | PB0 — Port B bit 0 / SS (SPI slave select) |
| Pino 17 | GND — Ground |
| Pino 18 | VCC — Digital supply voltage |
| Pino 19 | PA0 — Port A bit 0 / ADC0 |
| Pino 20 | PA1 — Port A bit 1 / ADC1 |
| Pino 21 | PA2 — Port A bit 2 / ADC2 |
| Pino 22 | PA3 — Port A bit 3 / ADC3 |
| Pino 23 | PA4 — Port A bit 4 / ADC4 |
| Pino 24 | PA5 — Port A bit 5 / ADC5 |
| Pino 25 | PA6 — Port A bit 6 / ADC6 |
| Pino 26 | PA7 — Port A bit 7 / ADC7 |
| Pino 27 | PC7 — Port C bit 7 / TDI (JTAG) |
| Pino 28 | PC6 — Port C bit 6 / TDO (JTAG) |
| Pino 29 | PC5 — Port C bit 5 / TMS (JTAG) |
| Pino 30 | PC4 — Port C bit 4 / TCK (JTAG) |
| Pino 31 | PC3 — Port C bit 3 |
| Pino 32 | PC2 — Port C bit 2 |
| Pino 33 | PC1 — Port C bit 1 |
| Pino 34 | PC0 — Port C bit 0 |
| Pino 35 | PD7 — Port D bit 7 / ICP1 |
| Pino 36 | PD6 — Port D bit 6 / T1 |
| Pino 37 | PD5 — Port D bit 5 / T0 |
| Pino 38 | PD4 — Port D bit 4 / XCK1 |
| Pino 39 | PD3 — Port D bit 3 / INT3 / TXD1 |
| Pino 40 | PD2 — Port D bit 2 / INT2 / RXD1 |
| Pino 41 | PD1 — Port D bit 1 / INT1 / SCL (TWI) |
| Pino 42 | PD0 — Port D bit 0 / INT0 / SDA (TWI) |
| Pino 43 | VCC — Digital supply voltage |
| Pino 44 | GND — Ground |
| Pino 45 | PF0 — Port F bit 0 / ADC0 |
| Pino 46 | PF1 — Port F bit 1 / ADC1 |
| Pino 47 | PF2 — Port F bit 2 / ADC2 |
| Pino 48 | PF3 — Port F bit 3 / ADC3 |
| Pino 49 | PF4 — Port F bit 4 / ADC4 / TCK (JTAG alt) |
| Pino 50 | PF5 — Port F bit 5 / ADC5 / TMS (JTAG alt) |
| Pino 51 | PF6 — Port F bit 6 / ADC6 / TDO (JTAG alt) |
| Pino 52 | PF7 — Port F bit 7 / ADC7 / TDI (JTAG alt) |
| Pino 53 | AGND — Analog ground |
| Pino 54 | AREF — Analog reference voltage for ADC |
| Pino 55 | GND — Ground |
| Pino 56 | AVCC — Analog supply voltage for ADC |
| Pino 57 | PG0 — Port G bit 0 / WR (external memory write) |
| Pino 58 | PG1 — Port G bit 1 / RD (external memory read) |
| Pino 59 | PG2 — Port G bit 2 / TOSC2 (RTC oscillator) |
| Pino 60 | PG3 — Port G bit 3 / TOSC1 (RTC oscillator) |
| Pino 61 | PG4 — Port G bit 4 |
| Pino 62 | XTAL2 — Main oscillator output |
| Pino 63 | XTAL1 — Main oscillator input / external clock |
| Pino 64 | RESET — Active-low reset input |
Aplicações típicas
ATMEGA64L-8AU é adequado para 6 aplicaçãos: Industrial Control and Automation, Data Acquisition and Instrumentation, Building Automation and HVAC, Legacy ATmega103 Board Replacement, Embedded Communication Nodes, Consumer and Appliance Control Boards.
Industrial Control and Automation
The ATMEGA64L-8AU fits industrial control panels thanks to its 53 programmable I/O lines, four Timer/Counters with PWM, and wide 2.7V to 5.5V operating range that tolerates noisy 5V industrial supplies. Typical roles include relay sequencing, stepper/servo pulse generation, and HMI button/LED scanning, all executed by the single-cycle AVR core at up to 8 MIPS. The 64KB Flash accommodates protocol stacks and state machines without external memory, while the 2KB EEPROM stores setpoints and counters across power cycles. In-system programming through SPI lets technicians field-update firmware without desoldering, and JTAG supports on-chip debug during commissioning, reducing bring-up time on the production line.
Recomendado
Data Acquisition and Instrumentation
With an 8-channel, 10-bit ADC and an internal bandgap reference, the ATMEGA64L-8AU serves multi-channel measurement nodes such as temperature, pressure, and voltage front ends. Free-running or single-conversion ADC modes let firmware balance resolution (10-bit) against sample rate, while the separate Real Time Counter with its own oscillator time-stamps logged events. The 4KB SRAM buffers sample blocks, and the 2KB EEPROM retains calibration constants. The dual USARTs and TWI bus stream results to a host or display over RS-232/RS-485. At 2.7V minimum supply the device also suits battery-powered portable instruments, with power-down sleep modes cutting quiescent drain between measurements.
Recomendado
Building Automation and HVAC
HVAC and building-automation controllers benefit from the ATMEGA64L-8AU combination of dual USARTs (for Modbus RTU plus a service port), TWI for connecting RTC and sensor chips, and abundant I/O for damper actuators, valves, and thermostat inputs. The 10-bit ADC reads NTC thermistors across up to eight zones, and four PWM-capable timers modulate fan speeds and proportional valves. Real Time Counter operation with a 32.768 kHz crystal maintains schedules through main-clock sleep states, conserving power in battery-backed zones. The mature, field-proven AVR ecosystem and decades of design collateral make retrofit and service of installed-base controllers straightforward.
Recomendado
Legacy ATmega103 Board Replacement
According to the Microchip datasheet, the ATmega64 is 100 percent pin compatible with the ATmega103 and can replace it on current printed circuit boards. EOL ATmega103 sockets can therefore be repopulated with ATMEGA64L-8AU, gaining 64KB Flash, the 10-bit ADC, and JTAG debugging that the ATmega103 lacked. The application note 'Replacing ATmega103 by ATmega64' documents fuse, register, and initialization differences that firmware teams must review before the swap. Because the L speed grade also runs down to 2.7V, boards shipped in both 3.3V and 5V variants can share one BOM line, simplifying procurement of discontinued-memory upgrades.
Recomendado
Embedded Communication Nodes
The two independent USARTs of the ATMEGA64L-8AU enable gateway nodes bridging, for example, an RS-485 Modbus field bus and an RS-232 or TTL debug/console link simultaneously. Hardware support for 9-bit multiprocessor framing, the SPI port for RF modules or SD cards, and the TWI bus for configuration EEPROMs let a single TQFP-64 device integrate an entire communication sub-system. The 64KB Flash holds stack, drivers, and web-style configuration logic, while PWM timers generate status beacons or drive carrier LEDs. JTAG boundary scan additionally supports ICT (in-circuit test) coverage of the processor's net connections during board production.
Recomendado
Consumer and Appliance Control Boards
Appliance main boards, chargers, and small home devices use the ATMEGA64L-8AU where cost, availability of mature supply, and proven firmware ecosystems matter more than peak performance. The device handles capacitive or mechanical button matrices, buzzer tones, motor PWM, and 10-bit ADC battery monitoring simultaneously with its four timers and eight ADC channels. Operating down to 2.7V supports two-cell battery products, and power-down sleep modes meet low standby-draw targets. The 64-pin TQFP (14x14 mm) is wave-and-reflow friendly and offers enough I/O to eliminate glue logic, cutting BOM count. In-system programming supports final-test firmware flashing on the assembly line.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ATMEGA64L-8AU — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ATMEGA64L-8AQ | ATMEGA64A-AUR | ATMEGA64-16AU | ATMEGA128L-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 Speed | 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 | 1.8 V to 5.5 V (ATmega64A) | 4.5 V to 5.5 V | 2.7 V to 5.5 V |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB | 128 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 2 KB | 4 KB |
| Lifecycle Status | Mature / NRND (replaced by ATmega64A) | Mature / NRND | Active (recommended) | Mature / NRND | Mature / NRND (replaced by ATmega128A) |
Principais diferenciais
- 100% pin compatible with ATmega103 (vs ATMEGA128L-8AU)
- Low-voltage L speed grade (vs ATMEGA64-16AU)
- JTAG on-chip debug and boundary scan (vs ATMEGA64A-AUR)
Notas de projeto
Decouple both VCC pins (18, 43) and AVCC (56) with 100 nF ceramic capacitors placed within a few millimeters of each pin, plus one bulk 10 uF per supply rail. Tie AVCC to VCC through a low-pass LC filter when ADC accuracy matters, and never leave AVCC floating even if the ADC is unused - the datasheet requires AVCC within 0.3V of VCC. Connect AGND (53) to a quiet analog ground island linked to digital ground at a single point to keep ADC switching noise out of measurements.
Verify fuse settings before first programming: the ATmega64 ships with the internal RC oscillator selected; if your board uses an external crystal, set the CKOPT and CKSEL fuses accordingly, and note that wrong SPIEN/JTAGEN fuse states can lock out ISP access. Also remember the RESET pin has an internal pull-up but boards in noisy environments should add an external 10k pull-up and consider a watchdog-enabled brown-out fuse (BODLEVEL) to prevent corruption during 2.7V brownout events near the L-grade minimum supply.
Keep the XTAL1/XTAL2 crystal traces short (under 15 mm) with guard ground, and place load capacitors close to pins 62/63. If using the TOSC1/TOSC2 32.768 kHz RTC oscillator (PG3/PG2), route it away from USART and SPI switching lines to avoid counting glitches. For the TWI bus on PD0/PD1, use 4.7k pull-ups at 100 kHz; at 400 kHz reduce to 2.2k. Series-terminate 22 ohms on SPI SCK lines longer than 100 mm to control ringing.
Informações de conformidade
AU suffix denotes RoHS-compliant lead-free TQFP package per Microchip ordering-code convention; REACH and halogen-free status not stated in provided data.
