ATMEGA640-16AU - 8-bit AVR MCU 16MHz 64KB Flash | Microchip
料号： ATMEGA640-16AU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $11.2 | $11.20 |
| 10 | $10.05 | $100.50 |
| 100 | $8.95 | $895.00 |
| 500 | $7.85 | $3,925.00 |
| 1,000 | $6.9 | $6,900.00 |
ATMEGA640-16AU 概述
An 8-bit AVR microcontroller is a member of the microcontroller unit (MCU) family that integrates a processor core, program memory, data memory, and peripherals on a single die. Within the embedded-system hierarchy, the MCU sits at the control layer, orchestrating sensors, actuators, and communication interfaces. The AVR enhanced RISC core executes most instructions in a single clock cycle, delivering approximately 1 MIPS per MHz of throughput, which is the throughput-per-megahertz benchmark used across the ATmega lineup. The 16 MHz speed grade therefore yields ~16 MIPS, while in-system programmable (ISP) Flash allows firmware updates without removing the device from the PCB.
Key features include 86 general-purpose I/O lines, 32 general-purpose working registers, a real-time counter, six flexible timer/counters with compare modes and PWM, four USARTs, a byte-oriented 2-wire serial interface (I2C/TWI), an SPI interface, a 16-channel 10-bit ADC, and an on-chip JTAG interface for boundary-scan and on-chip debugging. The 16 MHz speed grade and 2.7 V to 5.5 V supply range cover both 3.3 V and 5 V rails, simplifying mixed-voltage designs.
The AVR enhanced RISC architecture combines a rich instruction set with single-cycle execution, while ISP Flash enables in-system firmware updates. The generous 86-I/O count and 16 PWM channels suit multi-axis motor control, and the four USARTs enable multi-channel serial communication such as RS-485 networks or multi-drop sensor buses.
Typical applications include industrial automation controllers, building automation, 3D printers and CNC controllers, Arduino Mega-class development platforms (via MegaCore support), and multi-sensor instrumentation. The wide TQFP-100 footprint provides ample I/O for gateways, and the JTAG debug port speeds firmware bring-up.
Design consideration: ensure decoupling capacitors on all VCC/AVCC pins and account for the wide TQFP-100 footprint in PCB routing; the ADC reference and AVCC supply should be filtered separately from digital VCC to preserve ADC accuracy at 10 bits.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： ATMEGA640-16AU ——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： ATMEGA640-16AU （相同外形与封装尺寸） ——差异在于 Package, Watchdog Timer, Timers/Counters, ADC, ADC Channels.
快速对比工具——选择替代料号进行并排对比：
ATMEGA1280-16AU
✅ 直接替换📋 参考替代料（不在目录中）
ATMEGA2560-16AU
✅ 直接替换✓ 有现货
$8.87 / 个
查看数据手册 →ATMEGA640V-8AU
✅ 直接替换✓ 有现货
$3.95 / 个
查看数据手册 →ATMEGA640-16CU
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$8.61 / 个
查看数据手册 →ATMEGA640-16AU 最大额定值与电气特性
| Core Architecture | AVR Enhanced RISC (8-bit) |
| Series | ATmega640 |
| Program Memory (Flash) | 64 KB (32K x 16) |
| SRAM | 8 KB |
| EEPROM | 4 KB |
| 最大时钟频率 | 16 MHz |
| Throughput | ~16 MIPS |
| 电源电压 | 2.7 V to 5.5 V |
| I/O Pins | 86 |
| ADC | 16 channels x 10-bit |
| PWM Channels | 16 |
| Timers/Counters | 6 |
| USART | 4 |
| SPI | 1 |
| TWI (I2C) | 1 |
| 封装 | 100-pin TQFP (14x14 mm) |
| 安装类型 | Surface Mount |
| 工作温度 | -40C to +85C (industrial) |
| In-System Programming | Yes (ISP) |
| On-Chip Debug | JTAG |
| RoHS 状态 | Compliant |
ATMEGA640-16AU 引脚配置
| 引脚 1 | PE5 — Port E bit 5 (GPIO / OC3C) |
| 引脚 2 | PE4 — Port E bit 4 (GPIO / OC3B / INT4) |
| 引脚 3 | PE3 — Port E bit 3 (GPIO / OC3A / AIN1) |
| 引脚 4 | PE2 — Port E bit 2 (GPIO / OC3B / AIN0) |
| 引脚 5 | PE1 — Port E bit 1 (GPIO / TXD0) |
| 引脚 6 | PE0 — Port E bit 0 (GPIO / RXD0 / PCINT8) |
| 引脚 7 | VCC — Digital supply voltage |
| 引脚 8 | GND — Ground |
| 引脚 9 | PB0 — Port B bit 0 (GPIO / SS / PCINT0) |
| 引脚 10 | PB1 — Port B bit 1 (GPIO / SCK / PCINT1) |
| 引脚 11 | PB2 — Port B bit 2 (GPIO / MOSI / PCINT2) |
| 引脚 12 | PB3 — Port B bit 3 (GPIO / MISO / PCINT3) |
| 引脚 13 | PB4 — Port B bit 4 (GPIO / OC2A / PCINT4) |
| 引脚 14 | PB5 — Port B bit 5 (GPIO / OC1A / PCINT5) |
| 引脚 15 | PB6 — Port B bit 6 (GPIO / OC1B / PCINT6) |
| 引脚 16 | PB7 — Port B bit 7 (GPIO / OC0A / OC1C / PCINT7) |
| 引脚 17 | PG5 — Port G bit 5 (GPIO / OC0B) |
| 引脚 18 | PG4 — Port G bit 4 (GPIO / TOSC1) |
| 引脚 19 | PG3 — Port G bit 3 (GPIO / TOSC2) |
| 引脚 20 | PG2 — Port G bit 2 (GPIO / AMR - alternator) |
| 引脚 21 | RESET — Reset input (active low) |
| 引脚 22 | VCC — Digital supply voltage |
| 引脚 23 | GND — Ground |
| 引脚 24 | XTAL2 — Crystal oscillator output |
| 引脚 25 | XTAL1 — Crystal oscillator input |
| 引脚 26 | PD0 — Port D bit 0 (GPIO / SCL / INT0) |
| 引脚 27 | PD1 — Port D bit 1 (GPIO / SDA / INT1) |
| 引脚 28 | PD2 — Port D bit 2 (GPIO / RXD1 / INT2) |
| 引脚 29 | PD3 — Port D bit 3 (GPIO / TXD1 / INT3) |
| 引脚 30 | PD4 — Port D bit 4 (GPIO / ICP1 / OC1B) |
| 引脚 31 | PD5 — Port D bit 5 (GPIO / XCK1) |
| 引脚 32 | PD6 — Port D bit 6 (GPIO / T1) |
| 引脚 33 | PD7 — Port D bit 7 (GPIO / T0) |
| 引脚 34 | PG0 — Port G bit 0 (GPIO / WR) |
| 引脚 35 | PG1 — Port G bit 1 (GPIO / RD) |
| 引脚 36 | PC0 — Port C bit 0 (GPIO / A8) |
| 引脚 37 | PC1 — Port C bit 1 (GPIO / A9) |
| 引脚 38 | PC2 — Port C bit 2 (GPIO / A10) |
| 引脚 39 | PC3 — Port C bit 3 (GPIO / A11) |
| 引脚 40 | PC4 — Port C bit 4 (GPIO / A12) |
| 引脚 41 | PC5 — Port C bit 5 (GPIO / A13) |
| 引脚 42 | PC6 — Port C bit 6 (GPIO / A14) |
| 引脚 43 | PC7 — Port C bit 7 (GPIO / A15) |
| 引脚 44 | VCC — Digital supply voltage |
| 引脚 45 | GND — Ground |
| 引脚 46 | PJ0 — Port J bit 0 (GPIO / RXD3 / PCINT9) |
| 引脚 47 | PJ1 — Port J bit 1 (GPIO / TXD3 / PCINT10) |
| 引脚 48 | PJ2 — Port J bit 2 (GPIO / XCK3 / PCINT11) |
| 引脚 49 | PJ3 — Port J bit 3 (GPIO / PCINT12) |
| 引脚 50 | PJ4 — Port J bit 4 (GPIO / PCINT13) |
| 引脚 51 | PJ5 — Port J bit 5 (GPIO / PCINT14) |
| 引脚 52 | PJ6 — Port J bit 6 (GPIO / PCINT15) |
| 引脚 53 | PJ7 — Port J bit 7 |
| 引脚 54 | PA0 — Port A bit 0 (GPIO / AD0) |
| 引脚 55 | PA1 — Port A bit 1 (GPIO / AD1) |
| 引脚 56 | PA2 — Port A bit 2 (GPIO / AD2) |
| 引脚 57 | PA3 — Port A bit 3 (GPIO / AD3) |
| 引脚 58 | PA4 — Port A bit 4 (GPIO / AD4) |
| 引脚 59 | PA5 — Port A bit 5 (GPIO / AD5) |
| 引脚 60 | PA6 — Port A bit 6 (GPIO / AD6) |
| 引脚 61 | PA7 — Port A bit 7 (GPIO / AD7) |
| 引脚 62 | VCC — Digital supply voltage |
| 引脚 63 | GND — Ground |
| 引脚 64 | PF0 — Port F0 (GPIO / ADC0A1) |
| 引脚 65 | PF1 — Port F1 (GPIO / ADC1A1) |
| 引脚 66 | PF2 — Port F2 (GPIO / ADC2A1) |
| 引脚 67 | PF3 — Port F3 (GPIO / ADC3A1) |
| 引脚 68 | PF4 — Port F4 (GPIO / ADC4A1 / TCK) |
| 引脚 69 | PF5 — Port F5 (GPIO / ADC5A1 / TMS) |
| 引脚 70 | PF6 — Port F6 (GPIO / ADC6A1 / TDO) |
| 引脚 71 | PF7 — Port F7 (GPIO / ADC7A1 / TDI) |
| 引脚 72 | AREF — ADC reference voltage |
| 引脚 73 | GND — Ground |
| 引脚 74 | AVCC — Analog supply voltage |
| 引脚 75 | PK0 — Port K bit 0 (GPIO / ADC8A2) |
| 引脚 76 | PK1 — Port K bit 1 (GPIO / ADC9A2) |
| 引脚 77 | PK2 — Port K bit 2 (GPIO / ADC10A2) |
| 引脚 78 | PK3 — Port K bit 3 (GPIO / ADC11A2) |
| 引脚 79 | PK4 — Port K bit 4 (GPIO / ADC12A2) |
| 引脚 80 | PK5 — Port K bit 5 (GPIO / ADC13A2) |
| 引脚 81 | PK6 — Port K bit 6 (GPIO / ADC14A2) |
| 引脚 82 | PK7 — Port K bit 7 (GPIO / ADC15A2) |
| 引脚 83 | PH0 — Port H bit 0 (GPIO / RXD2) |
| 引脚 84 | PH1 — Port H bit 1 (GPIO / TXD2) |
| 引脚 85 | PH2 — Port H bit 2 (GPIO / XCK2) |
| 引脚 86 | PH3 — Port H bit 3 (GPIO / OC4A) |
| 引脚 87 | PH4 — Port H bit 4 (GPIO / OC4B) |
| 引脚 88 | PH5 — Port H bit 5 (GPIO / OC4C) |
| 引脚 89 | PH6 — Port H bit 6 (GPIO / OC2B) |
| 引脚 90 | PH7 — Port H bit 7 (GPIO / OC2A) |
| 引脚 91 | PL0 — Port L bit 0 (GPIO / ICP4) |
| 引脚 92 | PL1 — Port L bit 1 (GPIO / ICP5) |
| 引脚 93 | PL2 — Port L bit 2 (GPIO / T5) |
| 引脚 94 | PL3 — Port L bit 3 (GPIO / T4) |
| 引脚 95 | PL4 — Port L bit 4 (GPIO / T3) |
| 引脚 96 | PL5 — Port L bit 5 (GPIO / T2) |
| 引脚 97 | PL6 — Port L bit 6 (GPIO / T1) |
| 引脚 98 | PL7 — Port L bit 7 (GPIO / T0) |
| 引脚 99 | VCC — Digital supply voltage |
| 引脚 100 | GND — Ground |
典型应用
ATMEGA640-16AU 适用于 7 应用s: Industrial Automation Controller, 3D Printer / CNC Controller Board, Building Automation Gateway, Arduino Mega-Class Development Platform, Multi-Sensor Data Acquisition System, Multi-Channel Serial Communication Hub, Educational Microcontroller Trainer.
Industrial Automation Controller
The ATMEGA640-16AU fits industrial automation controllers because its 86 GPIO lines and four USARTs let it fan out to multiple RS-485 sensor nodes and actuator drivers from a single MCU. Its 16 MHz AVR core delivers ~16 MIPS, which is sufficient for sub-10 ms PLC scan loops and modest motion-control math, while the 64 KB Flash holds ladder-logic interpreters or IEC 61131-3 runtimes comfortably. The 2.7-5.5 V supply tolerates 24 V industrial rails after step-down. A 16-channel 10-bit ADC reads analog process variables, and the six timers with 16 PWM channels drive valve actuators and brushed-motor stages without external PWM ICs.
推荐
3D Printer / CNC Controller Board
The ATMEGA640-16AU is a strong fit for 3D printer and CNC controller boards because the six timer/counters with 16 PWM channels can drive multiple stepper-driver DIR/STEP lines, and the four USARTs expose serial console, Bluetooth, and a touchscreen module simultaneously. Its 64 KB Flash is enough for Marlin-class firmware builds, and ISP plus JTAG let makers iterate firmware in-place. The 16 MHz throughput plus hardware quadrature-friendly timers position it as a low-cost alternative to ARM Cortex-M0 designs in hobbyist CNC boards where MegaCore Arduino compatibility is desired.
推荐
Building Automation Gateway
The ATMEGA640-16AU is well suited to building-automation gateways where it must talk Modbus, BACnet, KNX, or proprietary sensor buses while running a control loop. The four USARTs handle multiple isolated RS-485 trunks with external transceivers, the TWI/I2C bus talks to environmental sensors, and the 86 GPIOs drive relay boards and indicator panels. The 8 KB SRAM fits small protocol stacks, and the 2.7-5.5 V supply range simplifies 24 V bus-powered designs. JTAG debug accelerates field firmware updates via ISP.
推荐
Arduino Mega-Class Development Platform
The ATMEGA640-16AU is supported by the open-source MegaCore Arduino core, making it a cost-down alternative to the ATmega2560 for Arduino-Mega-class development boards. With 64 KB Flash and 8 KB SRAM it runs the standard Arduino Mega bootloader and most Arduino libraries unmodified. The 86 GPIOs match the Arduino Mega pinout, so existing shields (RAMPS motor shields, sensor shields, display shields) plug in unchanged. This makes the part attractive to education and rapid-prototyping use cases where Arduino compatibility is required.
推荐
Multi-Sensor Data Acquisition System
The ATMEGA640-16AU fits multi-sensor data-acquisition systems because its 16-channel 10-bit ADC reads up to 16 analog inputs directly without external muxes, and its 86 GPIOs scan matrix keypads, encoders, and digital sensors in the same design. The 64 KB Flash holds small DSP-style filtering or calibration tables, while 8 KB SRAM buffers time-series sample blocks between UART transfers to a host PC. The four USARTs let the same board log to multiple hosts or stack into daisy-chained sensor networks.
推荐
Multi-Channel Serial Communication Hub
The ATMEGA640-16AU works as a multi-channel serial hub because it integrates four independent USARTs plus an SPI and a TWI interface, enabling a single MCU to bridge Modbus RTU, Modbus ASCII, DMX-512, GPS, and I2C sensor traffic simultaneously. Its 64 KB Flash fits protocol-conversion firmware, and 8 KB SRAM holds message queues between channels. The 2.7-5.5 V supply simplifies mixed 3.3 V/5 V sensor boards, while 86 GPIOs drive per-channel indicators and configuration switches.
推荐
Educational Microcontroller Trainer
The ATMEGA640-16AU fits educational microcontroller trainers thanks to its generous 86 GPIOs that allow multiple student groups to wire up peripherals on one board without bus contention, plus JTAG and ISP that give instructors direct register-level debug access. The AVR GCC toolchain and Atmel Studio / MPLAB X IDE are free, well-documented, and supported by extensive textbook material. The 2.7-5.5 V supply lets the same trainer board work with both 3.3 V and 5 V peripherals, covering the modern low-voltage and legacy 5 V labs in a single platform.
推荐
推荐产品汇总
工程参考数据： ATMEGA640-16AU ——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 | ATMEGA1280-16AU | ATMEGA2560-16AU | ATMEGA640V-8AU |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-100 (14x14) | TQFP-100 (14x14) - same | TQFP-100 (14x14) - same | TQFP-100 (14x14) - same |
| Flash Memory | 64 KB | 128 KB | 256 KB | 64 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB |
| EEPROM | 4 KB | 4 KB | 4 KB | 4 KB |
| Maximum Clock | 16 MHz | 16 MHz | 16 MHz | 8 MHz |
| I/O Pins | 86 | 86 | 86 | 86 |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 1.8 V to 5.5 V |
关键差异点
- Lowest-cost I/O-rich ATmega in TQFP-100 with 86 GPIO （对比 ATMEGA2560-16AU)
- Faster 16 MHz operation with same TQFP-100 pinout （对比 ATMEGA640V-8AU)
- Drop-in upgrade path without PCB rework （对比 ATMEGA640-16CU)
设计说明
Place 100 nF decoupling capacitors within 5 mm of every VCC/AVCC pin (5 VCC pins + 1 AVCC pin in TQFP-100) and a single bulk 10 uF tantalum or ceramic cap on each supply rail. AVCC must be filtered through a ferrite bead or 10 ohm resistor from digital VCC to preserve ADC accuracy; per the ATmega640 datasheet, AVCC voltage difference vs VCC should be kept under +/- 0.3 V. Use a separate low-noise reference for AREF if 10-bit ADC precision is required at low signal levels.
The TQFP-100 (14x14 mm, 0.5 mm pitch) requires 4-layer PCB with 0.2 mm via-in-pad or escape routing on inner layers for clean fan-out; do not attempt 2-layer routing with 0.5 mm pitch unless signal count is heavily reduced. Keep crystal traces short (under 10 mm) and shield with a ground guard ring to avoid EMI coupling into ADC. Expose the JTAG pins (PF4-PF7) to a 2x5 0.05" box header for Atmel-ICE / MPLAB Snap debug access.
Do not assume the ATmega640/1280/2560 are pin-compatible with the ATmega128/1281 family - port mappings and timer assignments differ. Always check the JTAG fuse (JTAGEN) is enabled before debugging; AVR Studio will not connect if disabled. The watchdog timer is enabled by default after reset on some lots - clear WDRF in MCUSR before main() to avoid surprise resets. ISP programming requires RESET, SCK, MOSI, MISO pins; ensure these remain accessible in the PCB layout.
合规信息
RoHS compliant per Microchip product page and distributor listings. REACH and halogen-free status not stated in the verified web data - confirm against the latest Microchip declaration. Not AEC-Q100 qualified; for automotive designs use automotive-qualified ATmega parts.
