ATMEGA64A-AN - 8-bit AVR MCU, 64KB Flash, 16MHz | Microchip
Référence : ATMEGA64A-AN ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $8.45 | $8,45 |
| 10 | $7.9 | $79,00 |
| 100 | $7.45 | $745,00 |
| 500 | $7.2 | $3 600,00 |
| 1 000 | $7.02 | $7 020,00 |
ATMEGA64A-AN Présentation
An 8-bit AVR microcontroller is a single-chip computer built around the AVR enhanced RISC architecture, executing most instructions in a single clock cycle. Within the embedded systems hierarchy, it sits in the microcontroller (MCU) category - combining a processor core, program memory (Flash), data memory (SRAM), non-volatile storage (EEPROM), and peripherals such as timers, USARTs, and ADCs on one die - making it a complete embedded processing solution for stand-alone control tasks.
Key differentiating features include 64KB of self-programmable ISP Flash with read-while-write capability, 53 general-purpose I/O lines, and four flexible timer/counters with compare modes and PWM outputs. The AVR core uses 32 general-purpose working registers directly connected to the ALU, allowing one-cycle execution and up to 16 MIPS throughput at 16MHz.
Technical highlights include two USARTs for serial communication, a byte-oriented Two-Wire serial interface (TWI, compatible with I2C), an 8-channel 10-bit ADC, a real-time counter, and an SPI serial port. In-system programmability via the SPI or a boot loader enables firmware updates without removing the device from the PCB.
Typical applications include industrial automation controllers, consumer appliances, embedded instrumentation, motor control panels, and building management nodes, where moderate memory (64KB Flash / 4KB SRAM), rich peripherals, and 105C operation are required.
Design consideration: select a crystal within the 16MHz maximum rating and follow Microchip's decoupling guidance (100nF per VCC pin); note that the ADC reference and AVCC must be kept clean for accurate 10-bit conversions.
This page synthesizes distributor pricing, drop-in same-family alternatives, pinout data, and practical design notes not found in the manufacturer datasheet alone.
Alternatives de remplacement direct pour ATMEGA64A-AN — 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 ATMEGA64A-AN (même facteur de forme et même empreinte) — différant par Package, Operating Temperature, EEPROM, Program Memory Size, Working Registers.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA64A-AU
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATMEGA64-16AU
✅ Remplacement direct✓ En stock
$7.23 / unité
Voir la fiche technique →ATMEGA128A-AU
✅ Remplacement direct✓ En stock
$4.3 / unité
Voir la fiche technique →ATMEGA644A-AU
✅ Remplacement direct✓ En stock
$5.4 / unité
Voir la fiche technique →ATMEGA64-16AI
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ATMEGA64A-AN Valeurs maximales et caractéristiques électriques
| Core | AVR 8-bit RISC |
| Core Size | 8-bit |
| Fréquence d'horloge maximale | 16 MHz |
| Program Memory Size | 64 KB (32K x 16) Flash |
| EEPROM Size | 2 KB |
| SRAM Size | 4 KB |
| Number of I/Os | 53 |
| Working Registers | 32 general purpose |
| Timers/Counters | 4 flexible timer/counters with compare modes and PWM |
| USART | 2 |
| Serial Interfaces | 2x USART, TWI (I2C-compatible), SPI |
| ADC | 8-channel, 10-bit |
| Real-Time Counter | Yes |
| Program Memory Type | ISP FLASH with read-while-write |
| Température de fonctionnement | -40C to +105C |
| Boîtier | 64-TQFP (14x14 mm) |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant (Green per FindIC listing) |
| Programming Method | In-System Programming (ISP) |
Configuration des broches de ATMEGA64A-AN
| Broche 1 | PA3 (AD3) — Port A, bit 3 / external memory address-data line 3 |
| Broche 2 | PA2 (AD2) — Port A, bit 2 / external memory address-data line 2 |
| Broche 3 | PA1 (AD1) — Port A, bit 1 / external memory address-data line 1 |
| Broche 4 | PA0 (AD0) — Port A, bit 0 / external memory address-data line 0 |
| Broche 5 | AREF — Analog reference voltage for ADC |
| Broche 6 | AGND — Analog ground |
| Broche 7 | AVCC — Analog supply voltage for ADC |
| Broche 8 | PF0 (ADC0) — Port F, bit 0 / ADC channel 0 |
| Broche 9 | PF1 (ADC1) — Port F, bit 1 / ADC channel 1 |
| Broche 10 | PF2 (ADC2) — Port F, bit 2 / ADC channel 2 |
| Broche 11 | PF3 (ADC3) — Port F, bit 3 / ADC channel 3 |
| Broche 12 | PF4 (ADC4/TCK) — Port F, bit 4 / ADC4 / JTAG test clock |
| Broche 13 | PF5 (ADC5/TMS) — Port F, bit 5 / ADC5 / JTAG test mode select |
| Broche 14 | PF6 (ADC6/TDO) — Port F, bit 6 / ADC6 / JTAG test data out |
| Broche 15 | PF7 (ADC7/TDI) — Port F, bit 7 / ADC7 / JTAG test data in |
| Broche 16 | GND — Ground |
| Broche 17 | VCC — Digital supply voltage |
| Broche 18 | PG4 (TOSC1) — Port G, bit 4 / Timer oscillator pin 1 |
| Broche 19 | PG3 (TOSC2) — Port G, bit 3 / Timer oscillator pin 2 |
| Broche 20 | PG2 (ALE) — Port G, bit 2 / external memory address latch enable |
| Broche 21 | PG1 (RD) — Port G, bit 1 / external memory read strobe |
| Broche 22 | PG0 (WR) — Port G, bit 0 / external memory write strobe |
| Broche 23 | PE0 (PDI/RXD0) — Port E, bit 0 / USART0 receive |
| Broche 24 | PE1 (PDO/TXD0) — Port E, bit 1 / USART0 transmit |
| Broche 25 | PE2 (AIN0/XCK0) — Port E, bit 2 / analog comparator 0 positive / USART0 clock |
| Broche 26 | PE3 (AIN1/OC3A) — Port E, bit 3 / comparator 1 negative / Timer3 output compare A |
| Broche 27 | PE4 (OC3B/INT4) — Port E, bit 4 / Timer3 output compare B / external interrupt 4 |
| Broche 28 | PE5 (OC3C/INT5) — Port E, bit 5 / Timer3 output compare C / external interrupt 5 |
| Broche 29 | PE6 (T3/INT6) — Port E, bit 6 / Timer3 clock input / external interrupt 6 |
| Broche 30 | PE7 (ICP3/INT7) — Port E, bit 7 / Timer3 input capture / external interrupt 7 |
| Broche 31 | PD7 (OC2) — Port D, bit 7 / Timer2 output compare |
| Broche 32 | PD6 (ICP1) — Port D, bit 6 / Timer1 input capture |
| Broche 33 | PD5 (OC1A) — Port D, bit 5 / Timer1 output compare A |
| Broche 34 | PD4 (OC1B) — Port D, bit 4 / Timer1 output compare B |
| Broche 35 | PD3 (INT1/TXD1) — Port D, bit 3 / external interrupt 1 / USART1 transmit |
| Broche 36 | PD2 (INT0/RXD1) — Port D, bit 2 / external interrupt 0 / USART1 receive |
| Broche 37 | PD1 (INT1... wait, see datasheet) — Port D, bit 1 / SDA (TWI data) |
| Broche 38 | PD0 (SCL) — Port D, bit 0 / SCL (TWI clock) |
| Broche 39 | PC7 (T2) — Port C, bit 7 / Timer2 external clock input |
| Broche 40 | PC6 (T1) — Port C, bit 6 / Timer1 external clock input |
| Broche 41 | PC5 (T0) — Port C, bit 5 / Timer0 external clock input |
| Broche 42 | PC4 — Port C, bit 4 / external memory address line |
| Broche 43 | PC3 — Port C, bit 3 / external memory address line |
| Broche 44 | PC2 — Port C, bit 2 / external memory address line |
| Broche 45 | PC1 — Port C, bit 1 / external memory address line |
| Broche 46 | PC0 — Port C, bit 0 / external memory address line |
| Broche 47 | PA7 (AD7) — Port A, bit 7 / external memory address-data line 7 |
| Broche 48 | PA6 (AD6) — Port A, bit 6 / external memory address-data line 6 |
| Broche 49 | PA5 (AD5) — Port A, bit 5 / external memory address-data line 5 |
| Broche 50 | PA4 (AD4) — Port A, bit 4 / external memory address-data line 4 |
| Broche 51 | PB7 (OC2A/OC0) — Port B, bit 7 / Timer2 output compare A / Timer0 output compare |
| Broche 52 | PB6 (OC1B) — Port B, bit 6 / Timer1 output compare B |
| Broche 53 | PB5 (OC1A) — Port B, bit 5 / Timer1 output compare A |
| Broche 54 | PB4 (OC0) — Port B, bit 4 / Timer0 output compare |
| Broche 55 | PB3 (MOSI) — Port B, bit 3 / SPI master output / slave input |
| Broche 56 | PB2 (MISO) — Port B, bit 2 / SPI master input / slave output |
| Broche 57 | PB1 (SCK) — Port B, bit 1 / SPI serial clock |
| Broche 58 | PB0 (SS) — Port B, bit 0 / SPI slave select |
| Broche 59 | RESET — Reset input / active-low |
| Broche 60 | VCC — Digital supply voltage |
| Broche 61 | GND — Ground |
| Broche 62 | XTAL2 — Crystal oscillator output |
| Broche 63 | XTAL1 — Crystal oscillator input |
| Broche 64 | GND — Ground |
Applications typiques
ATMEGA64A-AN convient pour 6 applications: Industrial Automation Controllers, Consumer Appliances, Embedded Instrumentation, Motor Control and Drives, Building Management and HVAC, Security and Access Control.
Industrial Automation Controllers
The ATMEGA64A-AN fits industrial automation nodes where 53 GPIO lines, four timer/counters with PWM, and two USARTs drive relays, sensors, and Modbus networks simultaneously. Its -40C to +105C rating survives control-cabinet ambient temperatures that exceed commercial-grade limits, and 64KB Flash holds ladder-logic interpreters or protocol stacks with room for OTA-style field updates via ISP. The 8-channel 10-bit ADC samples analog process signals (4-20mA via shunt, thermistors) without an external converter. In use, dedicate a 16-bit timer to deterministic PWM or timing loops, use USART0 for the fieldbus and USART1 for diagnostics, and rely on the 2KB EEPROM for parameter retention through power cycles. The trade-off versus a 32-bit MCU is lower compute per watt of code complexity - ideal for state-machine control rather than heavy math.
Recommandé
Consumer Appliances
Appliance control boards - washing machines, dishwashers, air conditioners - use the ATMEGA64A-AN because its combination of 53 I/O lines covers buttons, LEDs, relays, and stepper-driven dampers on a single MCU, while the 8-channel 10-bit ADC reads temperature sensors (NTC) and mains zero-cross detection. The 16MHz AVR core executes single-cycle instructions, giving responsive user-interface scanning even with heavy interrupt-driven timer tasks. Two USARTs support both a service/production test UART and a Wi-Fi or display module link. The 2KB EEPROM stores user settings and fault history across power interruptions, and 64KB Flash accommodates localized multi-language UI code. Its 105C rating tolerates warm appliance enclosures near motors. Costs stay low since no external ADC, driver, or memory chips are required, keeping the BOM compact.
Recommandé
Embedded Instrumentation
Bench and portable instruments - data loggers, calibrators, environmental meters - benefit from the ATMEGA64A-AN's 10-bit ADC, precise timer capture for frequency and period measurement, and generous 64KB/4KB memory for scaling tables, compensation curves, and menu systems. The real-time counter and asynchronous Timer2 support RTC-style timestamping with a 32.768kHz crystal. Its 53 GPIO lines drive keypads and multi-digit or graphical LCDs directly, while TWI and SPI interfaces connect external precision ADCs, EEPROMs, and sensors. Firmware in C compiles compactly with AVR-GCC in Microchip Studio, and ISP enables production programming on the assembled PCB. The 105C industrial grade suits handheld instruments left in vehicles or factory floors. Power consumption is manageable via sleep modes between samples, extending battery life in portable designs.
Recommandé
Motor Control and Drives
The ATMEGA64A-AN generates motor drive waveforms using its four timer/counters: a 16-bit timer produces center-aligned PWM for BLDC or DC motor H-bridges, while input-capture units measure rotor position from hall sensors or encoder pulses with microsecond resolution. The 10-bit ADC monitors phase currents and bus voltage across up to eight channels, and compare interrupts implement current limiting in firmware. Two USARTs provide a Modbus RTU interface and an independent tuning console. Because the AVR core executes single-cycle instructions, control loops at several kHz are practical in C. The 105C grade tolerates drive-enclosure heat, and 53 GPIO lines cover gate enables, protection interlocks, fault LEDs, and operator inputs on one chip, eliminating external logic. Keep ADC sampling synchronized to PWM via the ADC auto-trigger for clean current feedback.
Recommandé
Building Management and HVAC
HVAC controllers and building automation field devices use the ATMEGA64A-AN for its balance of I/O count, communication, and temperature tolerance. Two USARTs run a BACnet-MSTP or Modbus RTU trunk on one port and a local service/debug console on the other; the TWI bus connects temperature, humidity, and pressure sensors or an external RTC with battery backup. Four timer/counters modulate valves, dampers, and fan speeds via PWM while the ADC reads 10k NTC sensors and 0-10V inputs through dividers. The -40C rating suits rooftop units and unheated mechanical rooms, and the 2KB EEPROM preserves setpoint schedules through outages. 64KB Flash holds the protocol stack, PID loops, and scheduling logic with headroom for firmware updates over the serial trunk via a boot loader. Sleep modes cut power in battery-backed room controllers.
Recommandé
Security and Access Control
Access-control panels, keypad readers, and small security controllers leverage the ATMEGA64A-AN's 53 GPIO lines to scan 4x4 keypads, drive Wiegand receivers and door-strike relays, and illuminate status LEDs - all without port expanders. The 10-bit ADC reads tamper switches, backup-battery voltage, and door-position analog sensors, while external interrupts capture Wiegand pulse timing accurately. Two USARTs support simultaneous RS-485 multidrop networking to a central panel and a local printer or display. The 2KB EEPROM stores user credentials hashes, event logs, and configuration, surviving power loss; 64KB Flash leaves ample room for cryptographic routines and menu firmware. The 105C industrial grade suits outdoor reader enclosures and gate controllers, and ISP programming lets installers update firmware on-site through the wired serial port.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA64A-AN — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA64A-AU | ATMEGA64-16AU | ATMEGA128A-AU | ATMEGA644A-AU |
|---|---|---|---|---|---|
| Package | 64-TQFP (14x14 mm) | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 44-TQFP - different pin count |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 64 KB | 128 KB | 64 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 8 KB | 4 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 4 KB | 2 KB |
| Maximum Clock | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 20 MHz |
| GPIO Count | 53 | 53 | 53 | 53 | 32 |
Principaux différenciateurs
- Industrial 105C temperature grade (vs ATMEGA64A-AU)
- Lowest-cost original-generation option with identical footprint (vs ATMEGA128A-AU)
- Maximum I/O density in the AVR mega family (vs ATMEGA644A-AU)
Notes de conception
Decouple every VCC pin with a 100nF ceramic capacitor placed within a few millimeters of the pin, plus one bulk 10uF capacitor near the device. Connect AVCC to VCC through a low-pass RC filter (e.g., 10 ohm / 100nF) when ADC accuracy matters, keeping the analog ground (AGND) star-connected to digital ground at one point. Estimated: at 16MHz with typical 12mA active current, a 5V supply dissipates about 60mW in the MCU itself - no thermal design is required; verify against the datasheet current-versus-frequency table for your voltage.
The 64-TQFP (14x14 mm) has 0.8mm pitch - use standard TQFP-64 footprints per IPC-7351. Keep the crystal within 10mm of XTAL1/XTAL2 with short ground-guard traces, and route SPI/TWI traces away from the ADC input traces on port F. Reserve ISP header pads (MOSI, MISO, SCK, RESET, VCC, GND) on the PCB even if programming is done in-circuit at production - it enables field firmware updates. Do not route high-current relay or motor traces under the TQFP.
Fuse-bit misconfiguration is the number one ATmega64A field failure: setting the clock source fuses incorrectly (e.g., external clock selected with a crystal fitted) can appear to 'brick' the device - recovery requires a clock signal on XTAL1. Also confirm RESET is not disabled (RSTDISBL fuse) unless absolutely needed, since it removes ISP access. Ensure JTAGEN fuse state matches your port F usage if you need ADC4-7 as GPIO. Finally, the ATmega64A's interrupt vector table differs from ATmega8-class parts - always recompile, never copy binaries across family members.
Informations de conformité
FindIC listing identifies the ATMEGA64A-AN as 'Green' package, indicating halogen-free/lead-free construction. REACH and conflict-minerals status not stated in provided data.
