ATMEGA640-16AUR - 8-bit AVR MCU 64KB Flash 16MHz TQFP-100 | Microchip
MPN: ATMEGA640-16AUR ✓ Hoạt độngATMEGA640-16AUR Tóm tắt
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, delivering close to 1 MIPS per MHz. The AVR ATmega family sits within the broader taxonomy of microcontroller units (MCUs) under the semiconductor and embedded-system hierarchy, and the ATmega640 shares its core with the ATmega1280/ATmega2560 used on the Arduino Mega platform, making it familiar to a wide embedded engineering audience.
Key features include 32 general-purpose working registers, six flexible timer/counters with compare and PWM modes, a real-time counter with separate oscillator, and an 8/16-channel 10-bit successive-approximation ADC. The device also integrates two programmable serial USARTs, a master/slave SPI interface, a byte-oriented 2-wire serial interface (TWI/I2C-compatible), a programmable watchdog timer with its own on-chip oscillator, an on-chip analog comparator, and an output-compare modulator for dead-time generation.
Technical depth: the AVR core achieves close to 1 MIPS per MHz throughput, allowing the ATMEGA640-16AUR to deliver approximately 16 MIPS at 16 MHz while keeping active power low. ISP Flash supports firmware updates on the final PCB without removing the device, the 4 KB EEPROM retains calibration and configuration data through power cycles, and the 100-pin TQFP package exposes enough I/O for parallel buses, multiple UART channels, and PWM-rich motor-control front-ends simultaneously.
Typical applications include industrial control systems, building automation and HVAC controllers, consumer appliances, white goods, and instrumentation requiring many I/O lines and multiple serial channels. Its Arduino Mega compatibility also makes it popular for rapid prototyping and education.
Design consideration: the suffix decoding matters - 16A = 16 MHz / 4.5-5.5 V, U = industrial temperature (-40C to +85C), R = tape-and-reel. For 2.7-5.5 V or 8 MHz battery designs, choose ATmega640V-8AUR instead. Ensure ISP programming signals (MOSI, MISO, SCK, RESET) are brought out to a programming header.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet, with data verified as of 2026-10-07.
Bộ thay thế dễ dàng lắp đặt cho ATMEGA640-16AUR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ATMEGA640-16AUR (cùng hình factor và footprint) — khác nhau ở ADC, Flash Memory, Package, RoHS Status, EEPROM.
ATMEGA640-16AU
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA1280-16AUR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA2560-16AUR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA1281-16AUR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA2561-16AUR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA640-16AUR Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit AVR RISC |
| Program Memory (Flash) | 64 KB (32K x 16) |
| SRAM | 8 KB |
| EEPROM | 4 KB |
| Maximum CPU Clock | 16 MHz |
| Operating Voltage (Vcc) | 4.5 V to 5.5 V |
| General-Purpose I/O Lines | 86 |
| General-Purpose Working Registers | 32 |
| Timer/Counters | 6 flexible timer/counters with compare/PWM |
| ADC | 10-bit, 8/16-channel |
| USART | 2 programmable serial USARTs |
| SPI | 1 master/slave SPI |
| TWI (I2C-compatible) | 1 byte-oriented 2-wire interface |
| Analog Comparator | On-chip |
| Watchdog Timer | Programmable, with separate on-chip oscillator |
| Hộp | 100-pin TQFP (14x14 mm) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40C to +85C (industrial) |
| In-System Programmable (ISP) | Yes |
| Trạng thái RoHS | Compliant |
Cấu hình chân ATMEGA640-16AUR
| Chân 1 | VCC — Digital supply voltage (5 V) |
| Chân 2 | PE0 (RXD0/PCINT8) — Port E bit 0 / USART0 RXD |
| Chân 3 | PE1 (TXD0) — Port E bit 1 / USART0 TXD |
| Chân 4 | PE2 (XCK0/AIN0) — Port E bit 2 / USART0 XCK / Analog Comparator Positive Input |
| Chân 5 | PE3 (OC3A/AIN1) — Port E bit 3 / Timer3 Compare A / Analog Comparator Negative Input |
| Chân 6 | PE4 (OC3B/INT4) — Port E bit 4 / Timer3 Compare B / External Interrupt 4 |
| Chân 7 | PE5 (OC3C/INT5) — Port E bit 5 / Timer3 Compare C / External Interrupt 5 |
| Chân 8 | PE6 (T3/INT6) — Port E bit 6 / Timer3 Clock Input / External Interrupt 6 |
| Chân 9 | PE7 (CLKO/ICP3) — Port E bit 7 / System Clock Output / Timer3 Input Capture |
| Chân 10 | VCC — Digital supply voltage (5 V) |
| Chân 11 | GND — Ground |
| Chân 12 | PH0 (RXD2) — Port H bit 0 / USART2 RXD |
| Chân 13 | PH1 (TXD2) — Port H bit 1 / USART2 TXD |
| Chân 14 | PH2 (XCK2) — Port H bit 2 / USART2 XCK |
| Chân 15 | PH3 (OC4A) — Port H bit 3 / Timer4 Compare A |
| Chân 16 | PH4 (OC4B) — Port H bit 4 / Timer4 Compare B |
| Chân 17 | PH5 (OC4C) — Port H bit 5 / Timer4 Compare C |
| Chân 18 | PH6 (OC2B) — Port H bit 6 / Timer2 Compare B |
| Chân 19 | PH7 (T4) — Port H bit 7 / Timer4 Clock Input |
| Chân 20 | PB0 (SS/PCINT0) — Port B bit 0 / SPI Slave Select |
| Chân 21 | PB1 (SCK/PCINT1) — Port B bit 1 / SPI Bus Clock |
| Chân 22 | PB2 (MOSI/PCINT2) — Port B bit 2 / SPI Master Out Slave In |
| Chân 23 | PB3 (MISO/PCINT3) — Port B bit 3 / SPI Master In Slave Out |
| Chân 24 | PB4 (OC2A/PCINT4) — Port B bit 4 / Timer2 Compare A |
| Chân 25 | PB5 (OC1A/PCINT5) — Port B bit 5 / Timer1 Compare A |
| Chân 26 | PB6 (OC1B/PCINT6) — Port B bit 6 / Timer1 Compare B |
| Chân 27 | PB7 (OC0A/OC1C/PCINT7) — Port B bit 7 / Timer0 Compare A / Timer1 Compare C |
| Chân 28 | VCC — Digital supply voltage (5 V) |
| Chân 29 | GND — Ground |
| Chân 30 | AVCC — Analog supply voltage (5 V) - for ADC |
| Chân 31 | GND — Ground |
| Chân 32 | AREF — ADC reference voltage input |
| Chân 33 | PF0 (ADC0) — Port F bit 0 / ADC Input Channel 0 |
| Chân 34 | PF1 (ADC1) — Port F bit 1 / ADC Input Channel 1 |
| Chân 35 | PF2 (ADC2) — Port F bit 2 / ADC Input Channel 2 |
| Chân 36 | PF3 (ADC3) — Port F bit 3 / ADC Input Channel 3 |
| Chân 37 | PF4 (ADC4/TCK) — Port F bit 4 / ADC Input Channel 4 / JTAG TCK |
| Chân 38 | PF5 (ADC5/TMS) — Port F bit 5 / ADC Input Channel 5 / JTAG TMS |
| Chân 39 | PF6 (ADC6/TDO) — Port F bit 6 / ADC Input Channel 6 / JTAG TDO |
| Chân 40 | PF7 (ADC7/TDI) — Port F bit 7 / ADC Input Channel 7 / JTAG TDI |
| Chân 41 | PA0 (AD0) — Port A bit 0 / External Memory Address/Data bit 0 |
| Chân 42 | PA1 (AD1) — Port A bit 1 / External Memory Address/Data bit 1 |
| Chân 43 | PA2 (AD2) — Port A bit 2 / External Memory Address/Data bit 2 |
| Chân 44 | PA3 (AD3) — Port A bit 3 / External Memory Address/Data bit 3 |
| Chân 45 | PA4 (AD4) — Port A bit 4 / External Memory Address/Data bit 4 |
| Chân 46 | PA5 (AD5) — Port A bit 5 / External Memory Address/Data bit 5 |
| Chân 47 | PA6 (AD6) — Port A bit 6 / External Memory Address/Data bit 6 |
| Chân 48 | PA7 (AD7) — Port A bit 7 / External Memory Address/Data bit 7 |
| Chân 49 | VCC — Digital supply voltage (5 V) |
| Chân 50 | GND — Ground |
| Chân 51 | PC7 (A15) — Port C bit 7 / External Memory Address bit 15 |
| Chân 52 | PC6 (A14) — Port C bit 6 / External Memory Address bit 14 |
| Chân 53 | PC5 (A13) — Port C bit 5 / External Memory Address bit 13 |
| Chân 54 | PC4 (A12) — Port C bit 4 / External Memory Address bit 12 |
| Chân 55 | PC3 (A11) — Port C bit 3 / External Memory Address bit 11 |
| Chân 56 | PC2 (A10) — Port C bit 2 / External Memory Address bit 10 |
| Chân 57 | PC1 (A9) — Port C bit 1 / External Memory Address bit 9 |
| Chân 58 | PC0 (A8) — Port C bit 0 / External Memory Address bit 8 |
| Chân 59 | PG1 (RD) — Port G bit 1 / External Memory Read strobe |
| Chân 60 | PG0 (WR) — Port G bit 0 / External Memory Write strobe |
| Chân 61 | PD7 (T0) — Port D bit 7 / Timer0 Clock Input |
| Chân 62 | PD6 (T1) — Port D bit 6 / Timer1 Clock Input |
| Chân 63 | PD5 (XCK1) — Port D bit 5 / USART1 XCK |
| Chân 64 | PD4 (ICP1) — Port D bit 4 / Timer1 Input Capture |
| Chân 65 | PD3 (INT3/TXD1) — Port D bit 3 / External Interrupt 3 / USART1 TXD |
| Chân 66 | PD2 (INT2/RXD1) — Port D bit 2 / External Interrupt 2 / USART1 RXD |
| Chân 67 | PD1 (SDA/INT1) — Port D bit 1 / TWI SDA / External Interrupt 1 |
| Chân 68 | PD0 (SCL/INT0) — Port D bit 0 / TWI SCL / External Interrupt 0 |
| Chân 69 | PG2 (ALE) — Port G bit 2 / External Memory Address Latch Enable |
| Chân 70 | VCC — Digital supply voltage (5 V) |
| Chân 71 | GND — Ground |
| Chân 72 | PK7 (ADC15/PCINT23) — Port K bit 7 / ADC Input Channel 15 |
| Chân 73 | PK6 (ADC14/PCINT22) — Port K bit 6 / ADC Input Channel 14 |
| Chân 74 | PK5 (ADC13/PCINT21) — Port K bit 5 / ADC Input Channel 13 |
| Chân 75 | PK4 (ADC12/PCINT20) — Port K bit 4 / ADC Input Channel 12 |
| Chân 76 | PK3 (ADC11/PCINT19) — Port K bit 3 / ADC Input Channel 11 |
| Chân 77 | PK2 (ADC10/PCINT18) — Port K bit 2 / ADC Input Channel 10 |
| Chân 78 | PK1 (ADC9/PCINT17) — Port K bit 1 / ADC Input Channel 9 |
| Chân 79 | PK0 (ADC8/PCINT16) — Port K bit 0 / ADC Input Channel 8 |
| Chân 80 | PJ7 — Port J bit 7 |
| Chân 81 | PJ6 (PCINT15) — Port J bit 6 |
| Chân 82 | PJ5 (PCINT14) — Port J bit 5 |
| Chân 83 | PJ4 (PCINT13) — Port J bit 4 |
| Chân 84 | PJ3 (PCINT12) — Port J bit 3 |
| Chân 85 | PJ2 (PCINT11) — Port J bit 2 |
| Chân 86 | PJ1 (PCINT10) — Port J bit 1 |
| Chân 87 | PJ0 (PCINT9) — Port J bit 0 |
| Chân 88 | PE0 — Port E bit 0 (second function on this pin) |
| Chân 89 | PE1 — Port E bit 1 (second function on this pin) |
| Chân 90 | PE2 — Port E bit 2 (second function on this pin) |
| Chân 91 | PE3 — Port E bit 3 (second function on this pin) |
| Chân 92 | PE4 — Port E bit 4 (second function on this pin) |
| Chân 93 | PE5 — Port E bit 5 (second function on this pin) |
| Chân 94 | PE6 — Port E bit 6 (second function on this pin) |
| Chân 95 | PE7 — Port E bit 7 (second function on this pin) |
| Chân 96 | VCC — Digital supply voltage (5 V) |
| Chân 97 | GND — Ground |
| Chân 98 | XTAL2 — Crystal oscillator output |
| Chân 99 | XTAL1 — Crystal oscillator input / external clock |
| Chân 100 | RESET — Reset input (active low) |
Ứng dụng tiêu biểu
ATMEGA640-16AUR phù hợp cho 6 Áp dụngs: Industrial Control Systems, Building Automation and HVAC, Consumer Appliances and White Goods, Instrumentation and Data Acquisition, Rapid Prototyping and Arduino-Compatible Designs, Education and Embedded Learning Platforms.
Industrial Control Systems
The ATMEGA640-16AUR fits industrial control applications because its 86 GPIO lines and six timer/counters easily drive multi-axis stepper/DC motor bridges, opto-isolated inputs, and relay outputs simultaneously. The 16 MHz CPU delivers 16 MIPS - sufficient for PID loops at typical 1 kHz control rates on multiple axes - while the 8 KB SRAM holds control tables and the 4 KB EEPROM stores calibration constants across power cycles. The industrial -40C to +85C temperature rating and 4.5-5.5 V supply match 5 V industrial backplanes without level shifters, and ISP Flash allows secure firmware updates via a programming header on the final assembly.
Được đề xuất
Building Automation and HVAC
Building automation controllers benefit from the ATMEGA640-16AUR's two USARTs, SPI, and TWI interfaces for simultaneously talking to Modbus RTU sensors, BACnet MS/TP networks, and local I2C peripherals (EEPROMs, RTCs, displays). The 86 I/O lines comfortably support multi-zone thermostat panels with keypads, character LCDs, and triac-driver outputs for damper and valve actuators. With 64 KB Flash, the device runs BACnet/Modbus stacks plus scheduling logic on-chip, and the 4 KB EEPROM retains setpoint schedules through power-loss events typical in HVAC installations.
Được đề xuất
Consumer Appliances and White Goods
The ATMEGA640-16AUR suits consumer appliances (washing machines, dishwashers, microwave ovens) where multiple motors, valves, sensors, and a user interface must be coordinated from a single MCU. Its 6 timer/counters with PWM modes drive motor bridges and inverter controls, the 10-bit ADC reads temperature/pressure/humidity sensors, and 86 GPIO lines connect to keypads, LCD/LED displays, and buzzer drivers. The ISP Flash allows late-stage firmware customization per model variant, and the 5 V industrial temperature rating covers under-cabinet appliance environments without extra components.
Được đề xuất
Instrumentation and Data Acquisition
The ATMEGA640-16AUR's 10-bit ADC with up to 16 channels, 8 KB SRAM for sample buffering, and 64 KB Flash for embedded signal-processing code make it well-suited to multi-channel data-acquisition front-ends. Two USARTs let the device stream data to a host PC while simultaneously talking to an isolated RS-485 sensor bus, and the TWI port connects to external 24-bit sigma-delta ADCs or DACs for higher precision. The 4 KB EEPROM stores calibration coefficients and channel-configuration data; ISP allows field recalibration without disassembling the instrument.
Được đề xuất
Rapid Prototyping and Arduino-Compatible Designs
The ATMEGA640-16AUR is functionally identical to the ATmega1280/2560 used on the Arduino Mega platform, so it benefits from the mature Arduino MegaCore open-source hardware package, library ecosystem, and community examples. Engineers prototyping 5 V Mega-form-factor designs can use the ATMEGA640-16AUR as a cost-optimized lower-Flash variant, with the same schematic footprint and 86 I/O mapping. The 16 MHz clock and 5 V supply match the original Mega reference design exactly, and ISP via the standard ICSP header supports bootloader flashing as well as in-circuit debugging.
Được đề xuất
Education and Embedded Learning Platforms
The ATMEGA640-16AUR provides an ideal teaching platform because it exposes nearly the entire AVR peripheral set - 86 GPIO, 6 timers, 10-bit ADC, two USARTs, SPI, TWI, analog comparator, and watchdog - in a single accessible 100-pin TQFP package. With 64 KB Flash, students can implement real RTOS kernels, file systems, or protocol stacks; with 4 KB EEPROM they can experiment with persistent storage; and with ISP they can repeatedly flash and debug code via low-cost tools such as the Microchip MPLAB Snap or Atmel-ICE. The 5 V industrial temperature rating also makes laboratory boards robust against student wiring errors.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATMEGA640-16AUR — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | ATMEGA640-16AU | ATMEGA1280-16AUR | ATMEGA2560-16AUR | ATMEGA1281-16AUR | ATMEGA2561-16AUR |
|---|---|---|---|---|---|---|
| Package | 100-pin TQFP (14x14 mm) | 100-pin TQFP (14x14 mm) - same | 100-pin TQFP (14x14 mm) - same | 100-pin TQFP (14x14 mm) - same | 100-pin TQFP (14x14 mm) - same | 100-pin TQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 64 KB | 64 KB | 128 KB | 256 KB | 128 KB | 256 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| EEPROM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Maximum Clock | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| GPIO Lines | 86 | 86 | 86 | 86 | 54 (64-pin family) | 54 (64-pin family) |
| Operating Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| ADC Channels | 16 (10-bit) | 16 (10-bit) | 16 (10-bit) | 16 (10-bit) | 8 (10-bit) | 8 (10-bit) |
| Packaging | Tape & Reel (R suffix) | Tray (no R suffix) | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel |
Bảo phân biệt quan trọng
- Balanced memory configuration vs smaller AVR family members (vsATMEGA328P-AUR)
- Compatible with Arduino Mega ecosystem and MegaCore package (vsATMEGA164A-AU)
- 100% forward-compatible upgrade path to ATMEGA2560-16AUR (vsATMEGA2560-16AUR)
- More ADC channels than 64-pin ATmega1281/2561 family (vsATMEGA1281-16AUR)
Ghi chú thiết kế
The ATMEGA640-16AUR requires both a digital VCC (5 V, multiple pins 10/28/49/70/96) and an analog AVCC (5 V, pin 30). Per the Microchip ATmega640 datasheet, AVCC should be tied to VCC through a low-pass filter (typically a ferrite bead + 0.1 uF + 10 uF capacitor) and AREF should be bypassed with a 100 nF capacitor even when using the internal reference. Decoupling: place one 100 nF ceramic on each VCC pin pair (VCC+GND), with a bulk 10-47 uF tantalum or ceramic near the supply pin. AREF decoupling is critical for ADC noise performance - the 10-bit ADC is sensitive to high-frequency supply noise riding on AVCC.
Route the crystal traces (XTAL1 pin 99, XTAL2 pin 98) short and symmetric with guard ground on both sides; keep digital signal traces away from the crystal loop to minimize clock jitter. The 100-pin TQFP (14x14 mm body, 0.5 mm pitch) is hand-solderable but rework-prone - design a small SPI/ICSP footprint (2x3 pin, 0.1 inch header) for ISP programming via MOSI/MISO/SCK/RESK from PB0-PB3 and pin 100. The RESET pin (pin 100) should have a 10 kohm pull-up to VCC and a 100 nF capacitor to ground for debouncing; ensure in-circuit debugging tools do not interfere with this RC network.
Do not assume ISP programming works on a freshly powered board - the AVR fuses must be set correctly (typically default: internal RC oscillator, 16 MHz CKDIV8, JTAG enabled). If fuses are mis-set (e.g., external clock selected but no clock present), the device appears 'bricked' and requires a high-voltage parallel programmer (e.g., Microchip STK500 or Atmel-ICE with HV mode) to recover. Always place the ISP header on the PCB and verify SPI signals with an oscilloscope during prototype bring-up. Also note the 'A' suffix denotes 4.5-5.5 V operation; using 'V-8A' variant at 16 MHz will fail to function reliably above 3 V supply.
At industrial -40C to +85C operation, the TQFP-100 package provides adequate thermal dissipation for the typical 15-20 mA active current. However, when the device is driving many GPIO pins simultaneously (e.g., backplane drivers, LED matrix), total I/O current can reach 200-400 mA, raising junction temperature. Estimated: at 5 V VCC, 200 mA total I/O current = 1 W dissipation, theta_JA ~50 C/W for TQFP-100 on 4-layer PCB -> 50C rise above ambient; within industrial range but with minimal margin. For high-I/O applications, distribute loads across multiple VCC/GND pin pairs to minimize ground bounce.
Thông tin tuân thủ
RoHS compliant per Microchip product page. The ATMEGA640-16AUR is the industrial-temperature (-40C to +85C) variant, but it is NOT AEC-Q100 qualified for automotive applications - choose ATMEGA640-16MUR or AEC-Q100-qualified ATmega equivalent for automotive designs. Lead-free (Pb-free) reflow profile per JEDEC J-STD-020.
