ATMEGA64A-MU - 8-Bit AVR MCU, 16MHz, 64KB Flash | Microchip
N.º da peça: ATMEGA64A-MU ✓ Ativo| Qtd. | Preço unitário | 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 Visão geral
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 drop-in para ATMEGA64A-MU — 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 ATMEGA64A-MU (mesmo formato e footprint) — diferindo em Package, Debug Interface, Flash Memory, Timer/Counters, EEPROM.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ATMEGA64-16MI
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$4.48 / unidade
Ver ficha técnica →ATMEGA128A-MUR
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$5.2 / unidade
Ver ficha técnica →AT90CAN64-16MU
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ATMEGA649A-MU
✅ Drop-In✓ Em estoque
$4.42 / unidade
Ver ficha técnica →ATMEGA103-16MI
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ATMEGA64A-MU Classificações máximas e características elétricas
| 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) |
| Encapsulamento | 64-QFN (9x9 mm), exposed pad, surface mount |
| Tipo de montagem | Surface Mount |
| Pin Compatibility | 100% pin compatible with ATmega103 |
Configuração de pinos do ATMEGA64A-MU
| Pino 1 | PE0 — Port E bit 0 / RXD0 / PDI |
| Pino 2 | PE1 — Port E bit 1 / TXD0 / PDO |
| Pino 3 | PE2 — Port E bit 2 / XCK0 / AIN0 |
| Pino 4 | PE3 — Port E bit 3 / AIN1 / OC3A |
| 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 / CLKO |
| Pino 9 | GND — Ground |
| Pino 10 | AVCC — Analog supply for ADC |
| Pino 11 | PG0 — Port G bit 0 / WR (external memory write strobe) |
| Pino 12 | PG1 — Port G bit 1 / RD (external memory read strobe) |
| Pino 13 | PC0 — Port C bit 0 / A8 (external memory address) |
| Pino 14 | PC1 — Port C bit 1 / A9 |
| Pino 15 | PC2 — Port C bit 2 / A10 |
| Pino 16 | PC3 — Port C bit 3 / A11 |
| Pino 17 | PC4 — Port C bit 4 / A12 |
| Pino 18 | PC5 — Port C bit 5 / A13 |
| Pino 19 | PC6 — Port C bit 6 / A14 |
| Pino 20 | PC7 — Port C bit 7 / A15 |
| Pino 21 | GND — Ground |
| Pino 22 | AREF — Analog reference for ADC |
| Pino 23 | PF0 — Port F bit 0 / ADC0 |
| Pino 24 | PF1 — Port F bit 1 / ADC1 |
| Pino 25 | PF2 — Port F bit 2 / ADC2 |
| Pino 26 | PF3 — Port F bit 3 / ADC3 |
| Pino 27 | PF4 — Port F bit 4 / ADC4 / TCK (JTAG) |
| Pino 28 | PF5 — Port F bit 5 / ADC5 / TMS (JTAG) |
| Pino 29 | PF6 — Port F bit 6 / ADC6 / TDO (JTAG) |
| Pino 30 | PF7 — Port F bit 7 / ADC7 / TDI (JTAG) |
| Pino 31 | PA0 — Port A bit 0 / AD0 (external memory bus) / GPIO |
| Pino 32 | PA1 — Port A bit 1 / AD1 |
| Pino 33 | PA2 — Port A bit 2 / AD2 |
| Pino 34 | PA3 — Port A bit 3 / AD3 |
| Pino 35 | PA4 — Port A bit 4 / AD4 |
| Pino 36 | PA5 — Port A bit 5 / AD5 |
| Pino 37 | PA6 — Port A bit 6 / AD6 |
| Pino 38 | PA7 — Port A bit 7 / AD7 |
| Pino 39 | PB0 — Port B bit 0 / SS (SPI slave select) / OC0 |
| Pino 40 | PB1 — Port B bit 1 / SCK (SPI clock) |
| Pino 41 | PB2 — Port B bit 2 / MOSI (SPI master out) |
| Pino 42 | PB3 — Port B bit 3 / MISO (SPI master in) |
| Pino 43 | PB4 — Port B bit 4 / OC2 (Timer2 output compare) |
| Pino 44 | PB5 — Port B bit 5 / OC1A (Timer1 output compare A) |
| Pino 45 | PB6 — Port B bit 6 / OC1B (Timer1 output compare B) |
| Pino 46 | PB7 — Port B bit 7 / OC0A / OC1C |
| Pino 47 | VCC — Digital supply voltage |
| Pino 48 | GND — Ground |
| Pino 49 | PD0 — Port D bit 0 / SCL (TWI clock) / INT0 |
| Pino 50 | PD1 — Port D bit 1 / SDA (TWI data) / INT1 |
| Pino 51 | PD2 — Port D bit 2 / TXD1 (USART1) / INT2 |
| Pino 52 | PD3 — Port D bit 3 / RXD1 (USART1) / INT3 |
| Pino 53 | PD4 — Port D bit 4 / ICP1 (Timer1 input capture) |
| Pino 54 | PD5 — Port D bit 5 / XCK1 (USART1 clock) |
| Pino 55 | PD6 — Port D bit 6 / T1 (Timer1 external clock) |
| Pino 56 | PD7 — Port D bit 7 / T2 (Timer2 external clock) |
| Pino 57 | PG2 — Port G bit 2 / ALE (external memory address latch enable) |
| Pino 58 | PG3 — Port G bit 3 / TOSC2 (RTC oscillator output) |
| Pino 59 | PG4 — Port G bit 4 / TOSC1 (RTC oscillator input) |
| Pino 60 | RESET — Reset input (active low) |
| Pino 61 | VCC — Digital supply voltage |
| Pino 62 | GND — Ground |
| Pino 63 | XTAL2 — Main crystal oscillator output |
| Pino 64 | XTAL1 — Main crystal oscillator input / external clock |
Aplicações típicas
ATMEGA64A-MU é adequado para 6 aplicaçãos: 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
Resumo dos produtos recomendados
Dados de referência de engenharia para ATMEGA64A-MU — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | 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) |
Principais diferenciais
- Doubling of program memory in the same footprint (vs ATMEGA128A-MU)
- Integrated hardware CAN controller (vs AT90CAN64-16MU)
- Direct ATmega103 legacy replacement (vs ATMEGA103-16MI)
Notas de projeto
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.
Informações de conformidade
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.
