ATMEGA64L-8AI - 8-bit AVR MCU 64KB Flash 8MHz | Microchip
Référence : ATMEGA64L-8AI ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $10.3 | $10,30 |
| 10 | $9.27 | $92,70 |
| 100 | $8.24 | $824,00 |
| 500 | $7.42 | $3 710,00 |
| 1 000 | $6.7 | $6 700,00 |
ATMEGA64L-8AI Présentation
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.
Alternatives de remplacement direct pour ATMEGA64L-8AI — 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-8AI (même facteur de forme et même empreinte) — différant par ADC, Package, EEPROM, Communication Interfaces, Operating Voltage.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA64L-8AU
✅ Remplacement direct✓ En stock
$4.55 / unité
Voir la fiche technique →ATMEGA64-16AU
✅ Remplacement direct✓ En stock
$7.23 / unité
Voir la fiche technique →ATMEGA64A-AUR
✅ Remplacement direct✓ En stock
$4.1 / unité
Voir la fiche technique →ATMEGA64A-AUR
✅ Remplacement direct✓ En stock
$4.1 / unité
Voir la fiche technique →ATMEGA64L-8AUR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATMEGA64-16AUR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATMEGA64L-8AI Valeurs maximales et caractéristiques électriques
| 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) |
| Fréquence d'horloge maximale | 8 MHz |
| Throughput | Up to 8 MIPS at 8 MHz |
| Operating Voltage | 2.7 V to 5.5 V |
| Température de fonctionnement | -40C to +85C |
| Boîtier | 64-TQFP (14x14 mm) |
| Type de montage | 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 |
| Statut RoHS | Compliant |
Configuration des broches de ATMEGA64L-8AI
| Broche 1 | PE6/RXD0/INT6 — Port E bit 6 / USART0 receive / external interrupt 6 |
| Broche 2 | PE7/TXD0/INT7 — Port E bit 7 / USART0 transmit / external interrupt 7 |
| Broche 3 | PB0/SS/SCK — Port B bit 0 / SPI slave select / SPI clock |
| Broche 4 | PB1/SCK — Port B bit 1 / SPI clock |
| Broche 5 | PB2/MOSI — Port B bit 2 / SPI master-out slave-in |
| Broche 6 | PB3/MISO — Port B bit 3 / SPI master-in slave-out |
| Broche 7 | PB4/OC0 — Port B bit 4 / timer 0 output compare |
| Broche 8 | PB5/OC1A — Port B bit 5 / timer 1 output compare A |
| Broche 9 | PB6/OC1B — Port B bit 6 / timer 1 output compare B |
| Broche 10 | PB7/OC2/OC1C — Port B bit 7 / timer 2 and timer 1 output compare |
| Broche 11 | TOSC2/PB7 — Timer oscillator pin 2 (crystal) |
| Broche 12 | TOSC1/PB6 — Timer oscillator pin 1 (crystal) |
| Broche 13 | XTAL2 — Inverting oscillator amplifier output |
| Broche 14 | XTAL1 — Inverting oscillator amplifier input |
| Broche 15 | RESET — Reset input (active low) |
| Broche 16 | VCC — Digital supply voltage |
| Broche 17 | GND — Ground |
| Broche 18 | PD0/SCL/INT0 — Port D bit 0 / I2C clock / external interrupt 0 |
| Broche 19 | PD1/SDA/INT1 — Port D bit 1 / I2C data / external interrupt 1 |
| Broche 20 | PD2/RXD1/INT2 — Port D bit 2 / USART1 receive / external interrupt 2 |
| Broche 21 | PD3/TXD1/INT3 — Port D bit 3 / USART1 transmit / external interrupt 3 |
| Broche 22 | PD4/IC1 — Port D bit 4 / timer 1 input capture |
| Broche 23 | PD5/XCK1 — Port D bit 5 / USART1 external clock |
| Broche 24 | PD6/T1 — Port D bit 6 / timer 1 counter input |
| Broche 25 | PD7/T2 — Port D bit 7 / timer 2 counter input |
| Broche 26 | PC0/A8 — Port C bit 0 / external memory address 8 |
| Broche 27 | PC1/A9 — Port C bit 1 / external memory address 9 |
| Broche 28 | PC2/A10 — Port C bit 2 / external memory address 10 |
| Broche 29 | PC3/A11 — Port C bit 3 / external memory address 11 |
| Broche 30 | PC4/A12 — Port C bit 4 / external memory address 12 |
| Broche 31 | PC5/A13 — Port C bit 5 / external memory address 13 |
| Broche 32 | PC6/A14 — Port C bit 6 / external memory address 14 |
| Broche 33 | PC7/A15 — Port C bit 7 / external memory address 15 |
| Broche 34 | VCC — Digital supply voltage |
| Broche 35 | GND — Ground |
| Broche 36 | PA7/AD7 — Port A bit 7 / external memory data 7 |
| Broche 37 | PA6/AD6 — Port A bit 6 / external memory data 6 |
| Broche 38 | PA5/AD5 — Port A bit 5 / external memory data 5 |
| Broche 39 | PA4/AD4 — Port A bit 4 / external memory data 4 |
| Broche 40 | PA3/AD3 — Port A bit 3 / external memory data 3 |
| Broche 41 | PA2/AD2 — Port A bit 2 / external memory data 2 |
| Broche 42 | PA1/AD1 — Port A bit 1 / external memory data 1 |
| Broche 43 | PA0/AD0 — Port A bit 0 / external memory data 0 |
| Broche 44 | VCC — Digital supply voltage |
| Broche 45 | GND — Ground |
| Broche 46 | AREF — Analog reference voltage for ADC |
| Broche 47 | AVCC — Analog supply voltage for ADC |
| Broche 48 | PF7/ADC7/TDI — Port F bit 7 / ADC channel 7 / JTAG test data in |
| Broche 49 | PF6/ADC6/TDO — Port F bit 6 / ADC channel 6 / JTAG test data out |
| Broche 50 | PF5/ADC5/TMS — Port F bit 5 / ADC channel 5 / JTAG test mode select |
| Broche 51 | PF4/ADC4/TCK — Port F bit 4 / ADC channel 4 / JTAG test clock |
| Broche 52 | PF3/ADC3 — Port F bit 3 / ADC channel 3 |
| Broche 53 | PF2/ADC2 — Port F bit 2 / ADC channel 2 |
| Broche 54 | PF1/ADC1 — Port F bit 1 / ADC channel 1 |
| Broche 55 | PF0/ADC0 — Port F bit 0 / ADC channel 0 |
| Broche 56 | GND — Ground |
| Broche 57 | VCC — Digital supply voltage |
| Broche 58 | PG5/OC0B — Port G bit 5 / timer 0 output compare B |
| Broche 59 | PG4/OC0A — Port G bit 4 / timer 0 output compare A |
| Broche 60 | PG3/TOSC2 — Port G bit 3 / timer oscillator pin 2 |
| Broche 61 | PG2/TOSC1 — Port G bit 2 / timer oscillator pin 1 |
| Broche 62 | PG1/RD — Port G bit 1 / external memory read strobe |
| Broche 63 | PG0/WR — Port G bit 0 / external memory write strobe |
| Broche 64 | PE0/RXD0/INT8 — Port E bit 0 / USART0 receive / external interrupt 8 |
Applications typiques
ATMEGA64L-8AI convient pour 6 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA64L-8AI — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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 |
Principaux différenciateurs
- Low-voltage operation down to 2.7 V (vs ATMEGA64-16AU)
- 8 MHz rating guaranteed across full voltage range (vs ATMEGA64A-AU)
- Pin-compatible with legacy ATmega103 (vs ATMEGA64L-8AU)
- Integrated 2 KB EEPROM for calibration storage (vs ATMEGA64-16AU)
Notes de conception
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.
Informations de conformité
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.
