ATMEGA64A-MN - 8-bit AVR MCU, 64KB Flash, 16MHz | Microchip
料号： ATMEGA64A-MN ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.9 | $6.90 |
| 10 | $6.21 | $62.10 |
| 100 | $5.52 | $552.00 |
| 500 | $4.97 | $2,485.00 |
| 1,000 | $4.48 | $4,480.00 |
ATMEGA64A-MN 概述
An 8-bit microcontroller unit (MCU) integrates a processor core, program memory, data memory, and peripherals on a single chip, sitting within the broader hierarchy of semiconductor devices: MCU -> embedded processor -> integrated circuit. The AVR architecture uses a Harvard structure with 32 general-purpose working registers directly connected to the ALU, allowing most instructions to execute in a single clock cycle, delivering up to 16 MIPS at 16MHz.
Key features include In-System Programmable (ISP) Flash with boot-code section for self-programming, 53 general-purpose I/O lines, four flexible timer/counters with compare modes and PWM, a real-time counter, plus USART, SPI, TWI (I2C), and an 8-channel 10-bit ADC. The ATmega64A is 100% pin compatible with the ATmega103, enabling drop-in replacement on existing PCBs per Microchip's migration application notes.
The enhanced AVR core executes powerful instructions in one cycle, and the device supports debugWIRE-style on-chip debugging via In-Circuit Serial Programming (ICSP) using two I/O pins plus reset, compatible with tools such as the MPLAB SNAP programmer.
Typical applications include industrial automation and control panels, embedded instrumentation, consumer appliances, motor control interfaces, and legacy ATmega103/ATmega64 system redesigns that require flash memory upgrades without PCB respin.
When designing with this device, confirm supply voltage (3.3V or 5V) against maximum clock frequency derating curves, and place 100nF decoupling capacitors at all VCC/AVCC pin pairs close to the exposed ground pad.
This page synthesizes distributor pricing, drop-in alternatives, package pinout data, and practical design notes not consolidated in the manufacturer datasheet. Pricing data is as of 2026-09-18.
直接替换替代料： ATMEGA64A-MN ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATMEGA64A-MN （相同外形与封装尺寸） ——差异在于 ADC, EEPROM Size, Flash Memory, Maximum Clock Frequency, Package.
快速对比工具——选择替代料号进行并排对比：
ATMEGA64A-MNR
✅ 直接替换✓ 有现货
$4.02 / 个
查看数据手册 →ATMEGA64A-MU
✅ 直接替换✓ 有现货
$4.24 / 个
查看数据手册 →ATMEGA128A-MN
✅ 直接替换✓ 有现货
$5.42 / 个
查看数据手册 →AT90CAN64-16MU
✅ 直接替换📋 参考替代料（不在目录中）
ATMEGA64A-MN 最大额定值与电气特性
| Core Processor | AVR |
| Core Size | 8-Bit |
| Max Clock Frequency | 16 MHz |
| Flash Memory | 64 KB (32K x 16) |
| Flash Type | ISP Flash, read-while-write |
| EEPROM | 2 KB |
| SRAM | 4 KB |
| Operating Voltage Range | 3.3 V / 5 V supply class |
| General Purpose I/O | 53 lines |
| Working Registers | 32 general purpose |
| Timer/Counters | 4 flexible timer/counters + real time counter |
| Communication Interfaces | USART, SPI, TWI (I2C) |
| ADC | 10-bit, 8 channels |
| 封装 | 64-QFN (9x9 mm), MLF, exposed pad |
| 安装类型 | Surface Mount |
| Temperature Rating | 105 C |
| Programming Interface | ICSP / in-system programmable |
| Pin Compatibility | 100% pin compatible with ATmega103 |
ATMEGA64A-MN 引脚配置
| 引脚 1 | PE0 (RXD0/PDI) — Port E bit 0 / USART0 receive / PDI |
| 引脚 2 | PE1 (TXD0/PDO) — Port E bit 1 / USART0 transmit / PDO |
| 引脚 3 | PE2 (AIN0/XCK0) — Port E bit 2 / Analog comparator input 0 / USART clock |
| 引脚 4 | PE3 (AIN1/OC3A) — Port E bit 3 / Comparator input 1 / Timer3 output compare A |
| 引脚 5 | PE4 (OC3B/INT4) — Port E bit 4 / Timer3 OC B / External interrupt 4 |
| 引脚 6 | PE5 (OC3C/INT5) — Port E bit 5 / Timer3 OC C / External interrupt 5 |
| 引脚 7 | PE6 (T3/INT6) — Port E bit 6 / Timer3 clock input / External interrupt 6 |
| 引脚 8 | PE7 (ICP3/INT7/CLKO) — Port E bit 7 / Timer3 input capture / Interrupt 7 / Clock out |
| 引脚 9 | PB0 (SS/PCINT0) — Port B bit 0 / SPI slave select |
| 引脚 10 | PB1 (SCK/PCINT1) — Port B bit 1 / SPI clock |
| 引脚 11 | PB2 (MOSI/PCINT2) — Port B bit 2 / SPI master out |
| 引脚 12 | PB3 (MISO/PCINT3) — Port B bit 3 / SPI master in |
| 引脚 13 | PB4 (OC0/PCINT4) — Port B bit 4 / Timer0 output compare |
| 引脚 14 | PB5 (OC1A/PCINT5) — Port B bit 5 / Timer1 output compare A |
| 引脚 15 | PB6 (OC1B/OC3B/PCINT6) — Port B bit 6 / Timer1 OC B |
| 引脚 16 | PB7 (OC2/OC3A/PCINT7) — Port B bit 7 / Timer2 output compare |
| 引脚 17 | PH0 (RXD2) — Port H bit 0 / USART2 receive |
| 引脚 18 | PH1 (TXD2) — Port H bit 1 / USART2 transmit |
| 引脚 19 | PH2 (XCK2) — Port H bit 2 / USART2 clock |
| 引脚 20 | PH3 (OC4A) — Port H bit 3 / Timer4 output compare A |
| 引脚 21 | PH4 (OC4B) — Port H bit 4 / Timer4 output compare B |
| 引脚 22 | PH5 (OC4C) — Port H bit 5 / Timer4 output compare C |
| 引脚 23 | PH6 (OC2B) — Port H bit 6 / Timer2 output compare B |
| 引脚 24 | PH7 (T4) — Port H bit 7 / Timer4 clock input |
| 引脚 25 | PG0 (WR) — Port G bit 0 / External memory write strobe |
| 引脚 26 | PG1 (RD) — Port G bit 1 / External memory read strobe |
| 引脚 27 | PG2 (ALE) — Port G bit 2 / External memory address latch enable |
| 引脚 28 | VCC — Digital supply voltage |
| 引脚 29 | GND — Digital ground |
| 引脚 30 | PJ0 (RXD3/PCINT9) — Port J bit 0 / USART3 receive |
| 引脚 31 | PJ1 (TXD3/PCINT10) — Port J bit 1 / USART3 transmit |
| 引脚 32 | PJ2 (XCK3/PCINT11) — Port J bit 2 / USART3 clock |
| 引脚 33 | PJ3 (OC4C/PCINT12) — Port J bit 3 / Timer4 output compare C |
| 引脚 34 | PJ4 (OC4B/PCINT13) — Port J bit 4 / Timer4 output compare B |
| 引脚 35 | PJ5 (OC4A/PCINT14) — Port J bit 5 / Timer4 output compare A |
| 引脚 36 | PJ6 (T4/PCINT15) — Port J bit 6 / Timer4 clock input |
| 引脚 37 | PJ7 (OC4D) — Port J bit 7 / Timer4 output compare D |
| 引脚 38 | PK0 (ADC0/PCINT16) — Port K bit 0 / ADC channel 0 |
| 引脚 39 | PK1 (ADC1/PCINT17) — Port K bit 1 / ADC channel 1 |
| 引脚 40 | PK2 (ADC2/PCINT18) — Port K bit 2 / ADC channel 2 |
| 引脚 41 | PK3 (ADC3/PCINT19) — Port K bit 3 / ADC channel 3 |
| 引脚 42 | PK4 (ADC4/PCINT20) — Port K bit 4 / ADC channel 4 |
| 引脚 43 | PK5 (ADC5/PCINT21) — Port K bit 5 / ADC channel 5 |
| 引脚 44 | PK6 (ADC6/PCINT22) — Port K bit 6 / ADC channel 6 |
| 引脚 45 | PK7 (ADC7/PCINT23) — Port K bit 7 / ADC channel 7 |
| 引脚 46 | PF0 (ADC0) — Port F bit 0 / ADC channel 0 |
| 引脚 47 | PF1 (ADC1) — Port F bit 1 / ADC channel 1 |
| 引脚 48 | PF2 (ADC2) — Port F bit 2 / ADC channel 2 |
| 引脚 49 | PF3 (ADC3) — Port F bit 3 / ADC channel 3 |
| 引脚 50 | PF4 (ADC4/TCK) — Port F bit 4 / ADC channel 4 / JTAG TCK |
| 引脚 51 | PF5 (ADC5/TMS) — Port F bit 5 / ADC channel 5 / JTAG TMS |
| 引脚 52 | PF6 (ADC6/TDO) — Port F bit 6 / ADC channel 6 / JTAG TDO |
| 引脚 53 | PF7 (ADC7/TDI) — Port F bit 7 / ADC channel 7 / JTAG TDI |
| 引脚 54 | GND — Ground |
| 引脚 55 | AVCC — Analog supply voltage for ADC and Port F |
| 引脚 56 | REFS — ADC reference / bandgap reference |
| 引脚 57 | XCK1/AIN0 (PD5) — Port D bit 5 / USART1 clock / comparator input |
| 引脚 58 | TXD1/INT3 (PD3) — Port D bit 3 / USART1 transmit / interrupt 3 |
| 引脚 59 | RXD1/INT2 (PD2) — Port D bit 2 / USART1 receive / interrupt 2 |
| 引脚 60 | INT1 (PD1) — Port D bit 1 / External interrupt 1 |
| 引脚 61 | INT0 (PD0) — Port D bit 0 / External interrupt 0 |
| 引脚 62 | XTAL2 (TOSC2/PG4) — Crystal oscillator output / Timer oscillator 2 |
| 引脚 63 | XTAL1 (TOSC1) — Crystal oscillator input / Timer oscillator 1 |
| 引脚 64 | RESET — Reset input (active low) |
典型应用
ATMEGA64A-MN 适用于 6 应用s: Industrial Automation and Control, Embedded Instrumentation and Test Equipment, ATmega103 Legacy System Upgrades, Motor Control and PWM Systems, Consumer Appliance Control Boards, Battery-Powered Embedded Devices.
Industrial Automation and Control
The ATMEGA64A-MN fits industrial automation nodes that need many digital I/O and deterministic timing: 53 GPIO lines, four timer/counters with PWM outputs, and a watchdog provide the control surface for PLC expansion modules, motor relays, and process monitoring. Its 105C rating supports enclosed control cabinets where ambient temperatures run high. Designers typically clock the AVR at 16MHz from a 5V rail for full-speed execution (16 MIPS single-cycle throughput) and use the 10-bit ADC for analog sensor feedback. The 64-QFN 9x9 package suits automated SMT assembly with exposed-pad thermal relief. Firmware updates in the field are handled through the boot-loader section of the ISP Flash using the on-board USART, avoiding device removal during maintenance cycles.
推荐
Embedded Instrumentation and Test Equipment
Bench instruments and data loggers benefit from the ATMEGA64A-MN's combination of 8-channel 10-bit ADC, 4KB SRAM for buffered acquisitions, and 2KB EEPROM for calibration constants that survive power cycling. The 16MHz AVR core executes single-cycle instructions for predictable sampling intervals, while USART and SPI handle communication with host controllers and display modules. The real-time counter supports timestamping in logging applications. Its 64-QFN footprint integrates cleanly on small instrument main boards. According to the Microchip ATmega64A datasheet (Atmel-8160), in-system programmability allows firmware flashing without removal from the test fixture, which accelerates production programming and functional calibration during instrument assembly.
推荐
ATmega103 Legacy System Upgrades
A primary design-in scenario for the ATmega64A family is replacing ATmega103 on existing PCBs: per Microchip's datasheet summary, the ATmega64A is 100% pin compatible with ATmega103 and drops into the same land pattern. This lets engineers extend product life by moving to currently available silicon with more capable peripherals, while the application note 'Replacing ATmega103 by ATmega64A' covers the software deltas such as register mapping and fuse defaults. The ATMEGA64A-MN's 64KB Flash also doubles legacy code headroom, and read-while-write support enables firmware updates through boot-loader code on already-deployed boards. Hardware redesign is unnecessary - only firmware recompilation and fuse configuration are required for migration.
推荐
Motor Control and PWM Systems
The ATMEGA64A-MN's four timer/counters with compare-match and PWM capability make it well suited to DC and stepper motor control in printers, robotics, and building automation. At 16MHz the PWM resolution supports fine speed control (e.g., 8-bit PWM at 62.5kHz on a 16MHz clock), fast enough for silent inductive drive with small filter stages. The 10-bit ADC reads back current-sense shunt amplifiers for closed-loop control, while 53 I/O lines manage limit switches, encoders, and status indicators. The 105C package rating tolerates motor-drive enclosure temperatures. Designers should place the exposed QFN ground pad solidly to the PCB plane to reduce switching-noise injection into ADC measurements.
推荐
Consumer Appliance Control Boards
Appliances such as washing machines, air conditioners, and kitchen equipment use ATMEGA64A-MN class MCUs for their balance of cost, memory, and peripherals. The 64KB Flash holds menu graphics logic and multiple language strings, while TWI (I2C) drives display and touch interface chips and USART handles communication with power-stage controllers. The Green/RoHS-compliant QFN package meets consumer environmental requirements, and the 105C rating covers heat-generating appliance interiors. The device's ISP Flash boot section supports manufacturing-line programming through a two-wire header, keeping production cycle time low. Field firmware issues can be resolved through boot-loader updates rather than product recalls, a significant cost advantage in consumer product management.
推荐
Battery-Powered Embedded Devices
Portable and battery-powered systems use the ATmega64A's power-management features - including idle, ADC noise reduction, power-save, power-down, stand-by, and extended stand-by sleep modes - to stretch battery life between wake events. The real-time counter continues operation in power-save mode, enabling periodic wake-and-measure cycles where the 10-bit ADC samples a sensor, data is stored to EEPROM or SRAM, and the MCU returns to a low-current state. The 3.3V operating class supports single-cell lithium and 3xAA powered designs. Engineers should consult the datasheet's power consumption tables versus clock frequency, since dynamic current scales linearly with the system clock and supply voltage.
推荐
推荐产品汇总
工程参考数据： ATMEGA64A-MN ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ATMEGA64A-MNR | ATMEGA64A-MU | ATMEGA128A-MN | ATMEGA64A-AUR | AT90CAN64-16MU |
|---|---|---|---|---|---|---|
| Package | 64-QFN (9x9) MLF, exposed pad | 64-QFN (9x9) - same | 64-QFN - same | 64-QFN - same | 64-TQFP - different | 64-QFN - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 64 KB | 128 KB | 64 KB | 64 KB |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Supply Voltage Class | 3.3 V / 5 V | 3.3 V / 5 V | 3.3 V / 5 V | 3.3 V / 5 V | 3.3 V / 5 V | 3.3 V / 5 V |
| Special Peripherals | USART, SPI, TWI, 10-bit ADC, 4 timers | Identical to ATMEGA64A-MN | Identical to ATMEGA64A-MN | Same set + larger memory | Identical to ATMEGA64A-MN | Adds CAN controller |
| Supply Format | Tray | Tape & Reel | Tray | Tray | Tape & Reel | Tray |
关键差异点
- 100% pin-compatible ATmega103 replacement with flash upgrade （对比 AT90CAN64-16MU)
- Lower cost for designs under 64KB code size （对比 ATMEGA128A-MN)
- Exposed-pad QFN thermal/mechanical advantage over TQFP （对比 ATMEGA64A-AUR)
设计说明
The 64-QFN (9x9) MLF package routes all I/O through perimeter pads plus a large center exposed pad that must be soldered to a dedicated ground array for both electrical ground and thermal dissipation. Use a 4x4 or 5x5 via-in-pad array (0.3 mm vias) under the exposed pad tied to the internal ground plane. Follow Microchip AN guidelines for QFN land-pattern design: perimeter pad extension of 0.1-0.2 mm outward, solder-mask defined pads preferred to prevent bridging on the 0.5 mm pitch.
The ATmega64A supports 3.3V and 5V operation, but the maximum safe clock frequency derates with supply voltage per the AVR operating envelope curve in the Microchip datasheet - do not run 16MHz at 3.3V without verifying the curve. Decouple every VCC and AVCC pin pair with 100nF ceramics placed within 3 mm of the pin, plus one 10uF bulk capacitor. Connect AVCC to VCC through a low-pass filter (10 ohm series, 100nF) when ADC accuracy matters, and tie the ADC reference pin with its own decoupling.
When migrating from ATmega103, remember that fuse defaults and register addresses differ even though pinout is 100% compatible - reconfigure lock and fuse bits via ICSP before first boot, per the Microchip application note 'Replacing ATmega103 by ATmega64A'. Also enable the watchdog deliberately: the ATmega64A WDT is available from reset on some fuse settings and can cause unexpected resets if inherited from code written for other AVRs. Verify JTAG pin sharing on PF4-PF7 when using those ADC channels.
Keep the crystal (XTAL1/XTAL2) traces short, under 10 mm, and surround them with a ground guard ring connected to the nearest ground via. On the 0.5 mm pitch QFN, maintain ground return paths under high-edge-rate digital traces such as SPI SCK to reduce crosstalk into the analog front end. Separate analog (Port F/ADC) routing from motor-driver PWM traces on the same layer to preserve 10-bit ADC effective resolution.
合规信息
Distributor data (FindIC) lists ATMEGA64A-MN as Green packaging (RoHS compliant, lead-free). REACH, halogen-free, and conflict-minerals declarations should be confirmed via Microchip's official compliance documentation.
