ATMEGA64A-MU - 8-Bit AVR MCU, 16MHz, 64KB Flash | Microchip
N.º de pieza: ATMEGA64A-MU ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $6.62 | $6,62 |
| 10 | $5.96 | $59,60 |
| 100 | $5.3 | $530,00 |
| 500 | $4.75 | $2.375,00 |
| 1.000 | $4.24 | $4.240,00 |
ATMEGA64A-MU Descripción general
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, sitting at the low-power end of the power-management and embedded-control hierarchy. The ATmega family is widely used in industrial control, consumer appliances, and embedded systems where flash self-programmability and rich peripherals matter more than raw compute throughput.
Key features include 53 general-purpose I/O lines, 32 general-purpose working registers, four flexible timer/counters with compare modes, two USARTs, an 8-channel 10-bit ADC, a byte-oriented Two-Wire Interface (I2C-compatible), SPI, and a JTAG interface for on-chip debug and boundary scan. Read-while-write ISP Flash enables firmware updates in the field without halting code execution.
The AVR core combines a 131-instruction set with single-cycle execution, delivering up to 16 MIPS at 16 MHz. A real-time counter with separate oscillator supports RTC applications, while the enhanced power-save, ADC noise reduction, and standby idle modes let designers trade performance against microamp-level sleep currents. The ATmega64A is 100% pin compatible with the ATmega103 and can replace the ATmega103 on current printed circuit boards.
Typical applications include industrial automation controllers, HVAC and building-control nodes, battery-powered instrumentation, motor-control front ends, and embedded consumer devices requiring multiple communication interfaces.
Design consideration: at 16 MHz, keep decoupling capacitors close to the multiple VCC/GND pin pairs, and use the JTAG port for in-circuit debugging before disabling it as a general-purpose I/O.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternativas directas para ATMEGA64A-MU — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ATMEGA64A-MU (mismo factor de forma y huella) — difiere en Package, Debug Interface, Flash Memory, Timer/Counters, EEPROM.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ATMEGA64-16MI
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$4.48 / unidad
Ver hoja de datos →ATMEGA128A-MUR
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$5.2 / unidad
Ver hoja de datos →AT90CAN64-16MU
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ATMEGA649A-MU
✅ Sustitución directa✓ En stock
$4.42 / unidad
Ver hoja de datos →ATMEGA103-16MI
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ATMEGA64A-MU Valores máximos y características eléctricas
| Core Architecture | 8-bit AVR RISC |
| Max Clock Frequency | 16 MHz |
| Flash Memory | 64 KB (32K x 16) ISP, read-while-write |
| EEPROM | 2 KB |
| SRAM | 4 KB |
| General Purpose I/O | 53 lines |
| Working Registers | 32 |
| Timer/Counters | 4 (two 8-bit, two 16-bit) plus RTC |
| USART Interfaces | 2 |
| ADC | 8-channel 10-bit |
| TWI (I2C) | Yes, byte-oriented |
| SPI | Yes |
| JTAG Interface | Yes (on-chip debug and boundary scan) |
| Encapsulado | 64-QFN (9x9 mm), exposed pad, surface mount |
| Tipo de montaje | Surface Mount |
| Pin Compatibility | 100% pin compatible with ATmega103 |
Configuración de pines de ATMEGA64A-MU
| Pin 1 | PE0 — Port E bit 0 / RXD0 / PDI |
| Pin 2 | PE1 — Port E bit 1 / TXD0 / PDO |
| Pin 3 | PE2 — Port E bit 2 / XCK0 / AIN0 |
| Pin 4 | PE3 — Port E bit 3 / AIN1 / OC3A |
| Pin 5 | PE4 — Port E bit 4 / OC3B / INT4 |
| Pin 6 | PE5 — Port E bit 5 / OC3C / INT5 |
| Pin 7 | PE6 — Port E bit 6 / T3 / INT6 |
| Pin 8 | PE7 — Port E bit 7 / ICP3 / INT7 / CLKO |
| Pin 9 | GND — Ground |
| Pin 10 | AVCC — Analog supply for ADC |
| Pin 11 | PG0 — Port G bit 0 / WR (external memory write strobe) |
| Pin 12 | PG1 — Port G bit 1 / RD (external memory read strobe) |
| Pin 13 | PC0 — Port C bit 0 / A8 (external memory address) |
| Pin 14 | PC1 — Port C bit 1 / A9 |
| Pin 15 | PC2 — Port C bit 2 / A10 |
| Pin 16 | PC3 — Port C bit 3 / A11 |
| Pin 17 | PC4 — Port C bit 4 / A12 |
| Pin 18 | PC5 — Port C bit 5 / A13 |
| Pin 19 | PC6 — Port C bit 6 / A14 |
| Pin 20 | PC7 — Port C bit 7 / A15 |
| Pin 21 | GND — Ground |
| Pin 22 | AREF — Analog reference for ADC |
| Pin 23 | PF0 — Port F bit 0 / ADC0 |
| Pin 24 | PF1 — Port F bit 1 / ADC1 |
| Pin 25 | PF2 — Port F bit 2 / ADC2 |
| Pin 26 | PF3 — Port F bit 3 / ADC3 |
| Pin 27 | PF4 — Port F bit 4 / ADC4 / TCK (JTAG) |
| Pin 28 | PF5 — Port F bit 5 / ADC5 / TMS (JTAG) |
| Pin 29 | PF6 — Port F bit 6 / ADC6 / TDO (JTAG) |
| Pin 30 | PF7 — Port F bit 7 / ADC7 / TDI (JTAG) |
| Pin 31 | PA0 — Port A bit 0 / AD0 (external memory bus) / GPIO |
| Pin 32 | PA1 — Port A bit 1 / AD1 |
| Pin 33 | PA2 — Port A bit 2 / AD2 |
| Pin 34 | PA3 — Port A bit 3 / AD3 |
| Pin 35 | PA4 — Port A bit 4 / AD4 |
| Pin 36 | PA5 — Port A bit 5 / AD5 |
| Pin 37 | PA6 — Port A bit 6 / AD6 |
| Pin 38 | PA7 — Port A bit 7 / AD7 |
| Pin 39 | PB0 — Port B bit 0 / SS (SPI slave select) / OC0 |
| Pin 40 | PB1 — Port B bit 1 / SCK (SPI clock) |
| Pin 41 | PB2 — Port B bit 2 / MOSI (SPI master out) |
| Pin 42 | PB3 — Port B bit 3 / MISO (SPI master in) |
| Pin 43 | PB4 — Port B bit 4 / OC2 (Timer2 output compare) |
| Pin 44 | PB5 — Port B bit 5 / OC1A (Timer1 output compare A) |
| Pin 45 | PB6 — Port B bit 6 / OC1B (Timer1 output compare B) |
| Pin 46 | PB7 — Port B bit 7 / OC0A / OC1C |
| Pin 47 | VCC — Digital supply voltage |
| Pin 48 | GND — Ground |
| Pin 49 | PD0 — Port D bit 0 / SCL (TWI clock) / INT0 |
| Pin 50 | PD1 — Port D bit 1 / SDA (TWI data) / INT1 |
| Pin 51 | PD2 — Port D bit 2 / TXD1 (USART1) / INT2 |
| Pin 52 | PD3 — Port D bit 3 / RXD1 (USART1) / INT3 |
| Pin 53 | PD4 — Port D bit 4 / ICP1 (Timer1 input capture) |
| Pin 54 | PD5 — Port D bit 5 / XCK1 (USART1 clock) |
| Pin 55 | PD6 — Port D bit 6 / T1 (Timer1 external clock) |
| Pin 56 | PD7 — Port D bit 7 / T2 (Timer2 external clock) |
| Pin 57 | PG2 — Port G bit 2 / ALE (external memory address latch enable) |
| Pin 58 | PG3 — Port G bit 3 / TOSC2 (RTC oscillator output) |
| Pin 59 | PG4 — Port G bit 4 / TOSC1 (RTC oscillator input) |
| Pin 60 | RESET — Reset input (active low) |
| Pin 61 | VCC — Digital supply voltage |
| Pin 62 | GND — Ground |
| Pin 63 | XTAL2 — Main crystal oscillator output |
| Pin 64 | XTAL1 — Main crystal oscillator input / external clock |
Aplicaciones típicas
ATMEGA64A-MU es adecuado para 6 aplicacións: Industrial Automation Controllers, HVAC and Building Control Nodes, Battery-Powered Instrumentation, Motor Control Front Ends, Embedded Consumer Devices, Legacy ATmega103 Board Redesign Avoidance.
Industrial Automation Controllers
The ATMEGA64A-MU fits industrial controller boards because its 64KB ISP Flash accommodates protocol stacks and state machines, its two USARTs drive RS-485 and a debug console simultaneously, and 53 GPIO lines interface relays, optocouplers, and limit switches directly. The 16 MHz single-cycle AVR core delivers deterministic interrupt latency for control loops up to the kilohertz range. Placed as the main MCU with a 5V rail and 100nF decoupling at each VCC pin, it reads encoders via timer capture and communicates over TWI or SPI to remote I/O expanders. Its JTAG port enables in-field debugging of deployed machinery controllers.
Recomendado
HVAC and Building Control Nodes
Building automation nodes benefit from the ATmega64A's real-time counter with the separate 32.768 kHz TOSC oscillator, enabling battery-backed timekeeping across power loss, while the 8-channel 10-bit ADC samples temperature, humidity, and pressure sensor chains. The 4KB SRAM holds multiple networked sensor buffers, and the two USARTs allow simultaneous RS-485 bus and service-port connectivity. Operating in power-save mode between acquisition cycles keeps standby current at microamp levels per the datasheet power tables, extending battery life in wireless-free, wall-thermostat-style deployments. The exposed-pad QFN improves heat dissipation in sealed enclosures.
Recomendado
Battery-Powered Instrumentation
Portable instruments leverage the ATMEGA64A-MU's power-down and power-save modes to stretch battery life while retaining the real-time counter for timestamping. The 10-bit ADC with internal reference digitizes bridge and thermistor inputs, and ADC noise reduction mode suppresses core clock noise during conversions, improving effective resolution at low sample rates. The 64KB Flash stores calibration tables and logging firmware, while 4KB SRAM buffers measurement records between UART or SPI uploads. With a 3V coin-cell or Li-ion rail through an LDO, the QFN's small 9x9 mm footprint suits handheld and panel-meter form factors.
Recomendado
Motor Control Front Ends
The ATmega64A's four timer/counters include two 16-bit units with input capture and three PWM compare channels per port B and E grouping, generating complementary or phase-correct PWM for DC and stepper motor drives. Input capture pins (ICP1, ICP3) timestamp quadrature or Hall sensor edges with 62.5 ns resolution at 16 MHz, enabling closed-loop speed control without external logic. The 10-bit ADC reads current-sense shunt amplifiers, and the fast AVR interrupt system handles overcurrent faults. External memory bus pins (ports A and C with ALE, WR, RD) allow expansion for larger trajectory tables via SRAM in servo applications.
Recomendado
Embedded Consumer Devices
Consumer appliances such as coffee machines, thermostats, and small printers use the ATMEGA64A-MU for its balance of Flash capacity and peripheral richness at a mainstream price. The byte-oriented TWI (I2C) manages touch controllers and EEPROM accessories, SPI drives display drivers and flash storage, and the dual USART supports factory test ports. Read-while-write ISP Flash allows field firmware updates through a bootloader without pausing output-critical timers. The 64-QFN with exposed pad solders reliably on standard reflow lines, and its 16 MHz core delivers responsive UI scan rates for keypads and rotary encoders in 5V or 3.3V designs.
Recomendado
Legacy ATmega103 Board Redesign Avoidance
Because Microchip documents the ATmega64A as 100% pin compatible with the ATmega103, the ATMEGA64A-MU is the standard migration path for boards designed around the obsolete ATmega103 in the 64-MLF/QFN footprint. The datasheet application note 'Replacing ATmega103 by ATmega64A' details register and peripheral differences. Designers gain doubled Flash (64KB), a second USART, more timers, and modern JTAG debugging without a PCB respin. This application is common in long-lifecycle industrial and medical equipment where recertification of a new board would be costly, making the drop-in swap the lowest-risk modernization route.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ATMEGA64A-MU — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ATMEGA64-16MI | ATMEGA128A-MU | AT90CAN64-16MU | ATMEGA649A-MU |
|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN EP - same | 64-QFN - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 128 KB | 64 KB | 64 KB |
| Hardware CAN Controller | No | No | No | Yes (CAN 2.0A/B) | No |
| Segment LCD Controller | No | No | No | No | Yes |
| Core Compatibility | 100% pin compatible with ATmega103 | Same die family (pre-A revision) | Pin-compatible family lineage | AT90 CAN AVR family | ATmega649 family (LCD pin remap) |
Diferenciadores clave
- Doubling of program memory in the same footprint (frente a ATMEGA128A-MU)
- Integrated hardware CAN controller (frente a AT90CAN64-16MU)
- Direct ATmega103 legacy replacement (frente a ATMEGA103-16MI)
Notas de diseño
The 64-QFN package exposes a large thermal pad on the underside that is internally connected to ground. Solder it to a ground copper pour with an array of thermal vias (typically 4x4 grid) to improve both heat dissipation and signal-ground integrity. Place 100nF ceramic decoupling capacitors within 2 mm of each VCC pin pair, plus one 4.7uF-10uF bulk capacitor near the supply entry. Connect AVCC to VCC through an LC filter (10uH ferrite bead plus 100nF) when ADC accuracy matters, and route AREF with its own decoupling capacitor.
JTAG is enabled by default from the factory on PORTF pins 4-7, disabling those ADC channels and GPIO. If your design uses ADC4-ADC7 or those port pins, disable JTAG via the JTD bit in MCUCSR (written twice within four cycles) or clear the JTAGEN fuse. Also note that RESET shares functions with PC6 in some AVR members - on ATmega64A RESET is a dedicated pin, but verify fuse settings (RSTDISBL must remain unprogrammed) before production programming, since programming it can permanently disable ISP entry.
For external memory bus operation (ALE, WR, RD with ports A and C), keep bus traces short and matched where possible, and latch AD0-AD7 with a 74x573 triggered by ALE. When running a 16 MHz crystal, place it within 5 mm of XTAL1/XTAL2 with grounded guard traces and use a crystal load capacitance per the crystal manufacturer's specification. The RTC TOSC 32.768 kHz circuit on PG3/PG4 is noise sensitive - isolate it from switching regulators and high-current PWM traces to avoid missed real-time ticks.
Información de cumplimiento
Current-production Microchip part supplied in standard RoHS-compliant, lead-free packaging per distributor listings. REACH and halogen-free declarations should be confirmed on the Microchip product compliance page for the exact ordering code.
