ATMEGA64L-8AU - 8-bit AVR MCU, 64KB Flash, 8MHz | Microchip
Référence : ATMEGA64L-8AU ✓ Actif| Qté | Prix unitaire | 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 Présentation
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.
Alternatives de remplacement direct pour ATMEGA64L-8AU — 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-8AU (même facteur de forme et même empreinte) — différant par Timers/Counters, ADC, Package, EEPROM, Debug Interface.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA64L-8AQ
✅ Remplacement direct✓ En stock
$7.5 / unité
Voir la fiche technique →ATMEGA64A-AUR
✅ Remplacement direct✓ En stock
$4.1 / unité
Voir la fiche technique →ATMEGA64A-MUR
✅ Remplacement direct✓ En stock
$4.42 / unité
Voir la fiche technique →ATMEGA64-16AU
✅ Remplacement direct✓ En stock
$7.23 / unité
Voir la fiche technique →ATMEGA128L-8AU
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$23.49 / unité
Voir la fiche technique →ATMEGA640V-8AU
✅ Remplacement direct✓ En stock
$3.95 / unité
Voir la fiche technique →ATMEGA64L-8AU Valeurs maximales et caractéristiques électriques
| 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 |
| Boîtier | 64-TQFP (14x14 mm) |
| Type de montage | Surface Mount |
| Lifecycle Note | Mature product, not recommended for new designs; replaced by ATmega64A |
Configuration des broches de ATMEGA64L-8AU
| Broche 1 | PE0 — Port E bit 0 / RXD0 (USART0 receive) |
| Broche 2 | PE1 — Port E bit 1 / TXD0 (USART0 transmit) |
| Broche 3 | PE2 — Port E bit 2 / XCK0 / AIN0 |
| Broche 4 | PE3 — Port E bit 3 / OC3A / AIN1 |
| Broche 5 | PE4 — Port E bit 4 / OC3B / INT4 |
| Broche 6 | PE5 — Port E bit 5 / OC3C / INT5 |
| Broche 7 | PE6 — Port E bit 6 / T3 / INT6 |
| Broche 8 | PE7 — Port E bit 7 / ICP3 / INT7 |
| Broche 9 | PB7 — Port B bit 7 / OC2 / OC1C |
| Broche 10 | PB6 — Port B bit 6 / OC1B |
| Broche 11 | PB5 — Port B bit 5 / OC1A |
| Broche 12 | PB4 — Port B bit 4 / OC0 |
| Broche 13 | PB3 — Port B bit 3 / MISO (SPI) |
| Broche 14 | PB2 — Port B bit 2 / MOSI (SPI) |
| Broche 15 | PB1 — Port B bit 1 / SCK (SPI) |
| Broche 16 | PB0 — Port B bit 0 / SS (SPI slave select) |
| Broche 17 | GND — Ground |
| Broche 18 | VCC — Digital supply voltage |
| Broche 19 | PA0 — Port A bit 0 / ADC0 |
| Broche 20 | PA1 — Port A bit 1 / ADC1 |
| Broche 21 | PA2 — Port A bit 2 / ADC2 |
| Broche 22 | PA3 — Port A bit 3 / ADC3 |
| Broche 23 | PA4 — Port A bit 4 / ADC4 |
| Broche 24 | PA5 — Port A bit 5 / ADC5 |
| Broche 25 | PA6 — Port A bit 6 / ADC6 |
| Broche 26 | PA7 — Port A bit 7 / ADC7 |
| Broche 27 | PC7 — Port C bit 7 / TDI (JTAG) |
| Broche 28 | PC6 — Port C bit 6 / TDO (JTAG) |
| Broche 29 | PC5 — Port C bit 5 / TMS (JTAG) |
| Broche 30 | PC4 — Port C bit 4 / TCK (JTAG) |
| Broche 31 | PC3 — Port C bit 3 |
| Broche 32 | PC2 — Port C bit 2 |
| Broche 33 | PC1 — Port C bit 1 |
| Broche 34 | PC0 — Port C bit 0 |
| Broche 35 | PD7 — Port D bit 7 / ICP1 |
| Broche 36 | PD6 — Port D bit 6 / T1 |
| Broche 37 | PD5 — Port D bit 5 / T0 |
| Broche 38 | PD4 — Port D bit 4 / XCK1 |
| Broche 39 | PD3 — Port D bit 3 / INT3 / TXD1 |
| Broche 40 | PD2 — Port D bit 2 / INT2 / RXD1 |
| Broche 41 | PD1 — Port D bit 1 / INT1 / SCL (TWI) |
| Broche 42 | PD0 — Port D bit 0 / INT0 / SDA (TWI) |
| Broche 43 | VCC — Digital supply voltage |
| Broche 44 | GND — Ground |
| Broche 45 | PF0 — Port F bit 0 / ADC0 |
| Broche 46 | PF1 — Port F bit 1 / ADC1 |
| Broche 47 | PF2 — Port F bit 2 / ADC2 |
| Broche 48 | PF3 — Port F bit 3 / ADC3 |
| Broche 49 | PF4 — Port F bit 4 / ADC4 / TCK (JTAG alt) |
| Broche 50 | PF5 — Port F bit 5 / ADC5 / TMS (JTAG alt) |
| Broche 51 | PF6 — Port F bit 6 / ADC6 / TDO (JTAG alt) |
| Broche 52 | PF7 — Port F bit 7 / ADC7 / TDI (JTAG alt) |
| Broche 53 | AGND — Analog ground |
| Broche 54 | AREF — Analog reference voltage for ADC |
| Broche 55 | GND — Ground |
| Broche 56 | AVCC — Analog supply voltage for ADC |
| Broche 57 | PG0 — Port G bit 0 / WR (external memory write) |
| Broche 58 | PG1 — Port G bit 1 / RD (external memory read) |
| Broche 59 | PG2 — Port G bit 2 / TOSC2 (RTC oscillator) |
| Broche 60 | PG3 — Port G bit 3 / TOSC1 (RTC oscillator) |
| Broche 61 | PG4 — Port G bit 4 |
| Broche 62 | XTAL2 — Main oscillator output |
| Broche 63 | XTAL1 — Main oscillator input / external clock |
| Broche 64 | RESET — Active-low reset input |
Applications typiques
ATMEGA64L-8AU convient pour 6 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA64L-8AU — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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) |
Principaux différenciateurs
- 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)
Notes de conception
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.
Informations de conformité
AU suffix denotes RoHS-compliant lead-free TQFP package per Microchip ordering-code convention; REACH and halogen-free status not stated in provided data.
