ATMEGA645-16AUR - 8-Bit AVR MCU 64KB 16MHz 64-TQFP | Microchip
MPN: ATMEGA645-16AUR ✓ Hoạt độngATMEGA645-16AUR Tóm tắt
A microcontroller (MCU) integrates a processor core, memory, and peripherals on a single chip, forming the lowest level of the embedded-system hierarchy: MCU -> processor -> semiconductor -> integrated circuit. The AVR ATmega family uses an advanced RISC architecture with 130 mostly single-cycle instructions, delivering up to 16 MIPS at 16 MHz.
Key features include 64 KB (32K x 16) self-programmable ISP Flash, a JTAG interface for on-chip debugging and boundary scan, 53 programmable I/O lines, an 8-channel 10-bit analog-to-digital converter, and two 8-bit plus one 16-bit timer architecture typical of the ATmega family. Boot loader support enables firmware reprogramming in the field via UART or other interfaces.
Architecturally, the AVR core separates program and data buses (Harvard architecture), executing most instructions in one clock cycle. Peripherals typically include USART serial links, SPI and I2C (TWI) interfaces, timers with PWM outputs, and analog comparators, allowing a single device to handle sensing, control, and communication in mid-complexity embedded designs.
Typical applications include industrial control and automation, embedded instrumentation and data loggers, and consumer appliance controllers where 64 KB of code space, robust I/O, and 5 V noise immunity are valued. The 5.5 V maximum supply suits direct connection to industrial 5 V buses.
Design consideration: keep the AVCC pin within 300 mV of VCC and decouple all supply pins with 100 nF ceramics placed within 5 mm of the package; connect RESET with a 10 k pull-up for reliable ISP programming.
This page synthesizes distributor pricing, drop-in alternatives, design notes, and AEO-optimized FAQs not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho ATMEGA645-16AUR — 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 ATMEGA645-16AUR (cùng hình factor và footprint) — khác nhau ở RoHS Status, ADC, Package, Packaging, Operating Temperature.
ATMEGA645-16AI
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA645-16AU
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA649-16AUR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA64A-AU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AT90CAN64-16AU
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA645-16AUR Tỷ lệ tối đa & tính chất điện
| Core | AVR 8-bit RISC |
| Core Size | 8-bit |
| Max Clock Frequency | 16 MHz |
| MIPS Throughput | 16 MIPS at 16 MHz |
| Program Memory (Flash) | 64 KB (32K x 16) |
| SRAM | 4 KB |
| EEPROM | 2 KB |
| Supply Voltage Range | 4.5 V to 5.5 V |
| ADC Channels | 8-channel 10-bit |
| Programmable I/O Lines | 53 (TQFP-64 package) |
| Debug Interface | JTAG (on-chip debugging and boundary scan) |
| Instruction Count | 130 instructions, most single-cycle |
| Hộp | 64-TQFP (14 x 14 mm) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40C to +85C (A grade) |
| Trạng thái RoHS | Compliant (R suffix) |
| Lifecycle Stage | Active |
Cấu hình chân ATMEGA645-16AUR
| Chân 1 | PA0 (ADC0) — Port A bit 0 / ADC channel 0 |
| Chân 2 | PA1 (ADC1) — Port A bit 1 / ADC channel 1 |
| Chân 3 | PA2 (ADC2) — Port A bit 2 / ADC channel 2 |
| Chân 4 | PA3 (ADC3) — Port A bit 3 / ADC channel 3 |
| Chân 5 | PA4 (ADC4) — Port A bit 4 / ADC channel 4 |
| Chân 6 | PA5 (ADC5) — Port A bit 5 / ADC channel 5 |
| Chân 7 | PA6 (ADC6) — Port A bit 6 / ADC channel 6 |
| Chân 8 | PA7 (ADC7) — Port A bit 7 / ADC channel 7 |
| Chân 9 | PB0 — Port B bit 0 |
| Chân 10 | VCC — Digital supply voltage |
| Chân 11 | GND — Ground |
| Chân 12 | PB1 — Port B bit 1 |
| Chân 13 | PB2 — Port B bit 2 |
| Chân 14 | PB3 — Port B bit 3 |
| Chân 15 | PB4 — Port B bit 4 / SPI MISO |
| Chân 16 | PB5 — Port B bit 5 / SPI MOSI |
| Chân 17 | PB6 — Port B bit 6 / SPI SCK |
| Chân 18 | PB7 — Port B bit 7 / OC0A |
| Chân 19 | PC0 — Port C bit 0 |
| Chân 20 | PC1 — Port C bit 1 |
| Chân 21 | PC2 (TCK) — Port C bit 2 / JTAG test clock |
| Chân 22 | PC3 (TMS) — Port C bit 3 / JTAG test mode select |
| Chân 23 | PC4 (TDO) — Port C bit 4 / JTAG test data out |
| Chân 24 | PC5 (TDI) — Port C bit 5 / JTAG test data in |
| Chân 25 | PC6 — Port C bit 6 |
| Chân 26 | PC7 — Port C bit 7 |
| Chân 27 | PD0 — Port D bit 0 |
| Chân 28 | PD1 — Port D bit 1 |
| Chân 29 | PD2 — Port D bit 2 / INT0 |
| Chân 30 | PD3 — Port D bit 3 / INT1 |
| Chân 31 | PD4 — Port D bit 4 |
| Chân 32 | PD5 — Port D bit 5 |
| Chân 33 | PD6 — Port D bit 6 |
| Chân 34 | PD7 — Port D bit 7 |
| Chân 35 | PE0 — Port E bit 0 |
| Chân 36 | PE1 — Port E bit 1 |
| Chân 37 | PE2 — Port E bit 2 |
| Chân 38 | PE3 — Port E bit 3 / OC3A |
| Chân 39 | PE4 — Port E bit 4 / OC3B |
| Chân 40 | PE5 — Port E bit 5 / OC3C |
| Chân 41 | PE6 — Port E bit 6 / INT6 |
| Chân 42 | PE7 — Port E bit 7 / INT7 |
| Chân 43 | PF0 — Port F bit 0 / ADC0 input mux |
| Chân 44 | PF1 — Port F bit 1 |
| Chân 45 | PF2 — Port F bit 2 |
| Chân 46 | PF3 — Port F bit 3 |
| Chân 47 | PF4 — Port F bit 4 / ADC input |
| Chân 48 | PF5 — Port F bit 5 / ADC input |
| Chân 49 | PF6 — Port F bit 6 / ADC input |
| Chân 50 | PF7 — Port F bit 7 / ADC input |
| Chân 51 | GND — Ground |
| Chân 52 | AREF — Analog reference for ADC |
| Chân 53 | AVCC — Analog supply voltage for ADC and Port F |
| Chân 54 | PG0 — Port G bit 0 |
| Chân 55 | PG1 — Port G bit 1 |
| Chân 56 | XTAL1 — Crystal oscillator input / external clock |
| Chân 57 | XTAL2 — Crystal oscillator output |
| Chân 58 | RESET — Active-low reset input |
| Chân 59 | PG2 — Port G bit 2 |
| Chân 60 | PG3 — Port G bit 3 |
| Chân 61 | PG4 — Port G bit 4 |
| Chân 62 | PG5 — Port G bit 5 / OC0B |
| Chân 63 | VCC — Digital supply voltage |
| Chân 64 | GND — Ground |
Ứng dụng tiêu biểu
ATMEGA645-16AUR phù hợp cho 6 Áp dụngs: Industrial Control and Automation, Embedded Instrumentation and Data Loggers, Appliance and Consumer Controllers, Hobbyist and Arduino-Compatible Development, Motor Control and PWM Systems, Communication and Networking Nodes.
Industrial Control and Automation
The ATMEGA645-16AUR fits industrial control nodes because its 4.5-5.5 V supply connects directly to legacy 5 V industrial logic buses, its 53 programmable I/O lines drive relays, indicators, and keypads, and the 8-channel 10-bit ADC samples analog process signals without an external converter. In a typical module, the MCU runs its control loop from 64 KB of ISP Flash while USART, SPI, and TWI interfaces link to sensors and a supervisory controller. The A-grade industrial temperature rating supports panel and floor-mounted enclosures. Because the AVR core executes most of its 130 instructions in a single cycle, deterministic interrupt latency keeps I/O timing predictable - a quantified advantage of 62.5 ns instruction time at 16 MHz over clock-predicated architectures.
Được đề xuất
Embedded Instrumentation and Data Loggers
For data loggers and bench instrumentation, the ATMEGA645-16AUR provides an 8-channel 10-bit ADC (approximately 4.9 mV resolution on a 5 V reference) for multi-sensor front ends, 2 KB EEPROM for non-volatile calibration constants and event counters, and 4 KB SRAM for buffering. The JTAG interface enables on-chip debugging and boundary-scan during manufacturing test, reducing bring-up time. Firmware updates in the field use the bootloader in the 64 KB ISP Flash, avoiding desoldering or ISP fixture access. Its 16 MHz clock yields 16 MIPS throughput, sufficient for sampling loops, timestamping, and serial reporting over USART to a host PC or radio module, while the 5 V core directly powers many analog front-end components without level shifting.
Được đề xuất
Appliance and Consumer Controllers
White-goods and appliance controllers value the ATmega645's combination of ample code space and robust I/O: 64 KB Flash accommodates feature-rich firmware with UI logic, while hardware timer PWM outputs drive triacs, blowers, and displays. The 10-bit ADC reads temperature sensors, potmeters, and current monitors across 8 channels. Running from an unregulated 5 V rail (4.5-5.5 V tolerance) simplifies power supply design with resistive or buck-derived rails common in appliances. EEPROM stores user settings and wear data across power cycles. The 64-TQFP (14 x 14 mm) surface-mount footprint supports automated assembly on typical appliance PCBA lines, and the active lifecycle status from Microchip secures long-term sourcing for products with decade-scale service lives.
Được đề xuất
Hobbyist and Arduino-Compatible Development
The ATMEGA645-16AUR is supported by the community MegaCore Arduino hardware package (MCUdude, GitHub), which brings Arduino IDE sketch development, standard libraries, and ISP-based uploading to the ATmega64/645/649/2560 family. With 64 KB Flash it can host large sketches plus a bootloader, and its 53 I/O lines exceed an ATmega328P by more than 3x, suiting robot chassis control, LED matrices, and retro-computing projects. Developers program it via AVR ISP mkII or Atmel-ICE over SPI ISP, or debug through JTAG. The 5 V logic level means direct compatibility with classic 5 V shields, sensors, and OLED modules, while single-cycle instruction execution keeps bit-banged protocols such as NeoPixel timing within tolerance at 16 MHz.
Được đề xuất
Motor Control and PWM Systems
In low-end motor control, the ATmega645's hardware timers generate complementary PWM outputs for DC motor H-bridges and AC light dimming, with the 16 MHz clock giving fine PWM resolution (up to about 1600 counts at 10 kHz). The 10-bit ADC samples back-EMF, potentiometer position, and current-shun amplifiers across 8 channels, enabling closed-loop speed control entirely in the 64 KB Flash firmware without external controllers. GPIO-driven inputs handle limit switches and encoder quadrature signals via pin-change interrupts. The 4.5-5.5 V rating tolerates noisy 5 V rails typical of power electronics boards, and brown-out detection (configurable in fuses) prevents flash corruption during supply dips - a critical reliability point when motors share the supply rail.
Được đề xuất
Communication and Networking Nodes
For serial-networked nodes, the ATmega645 integrates USART, SPI, and TWI (I2C), letting one chip bridge field devices to Modbus-RTU or custom RS-485 loops using an external transceiver. The 16 MIPS core handles CRC computation, frame parsing, and Modbus stacks within its 64 KB Flash, while 4 KB SRAM buffers multiple transaction frames. Bootloader-based field upgrades over the UART keep deployed nodes maintainable. The 10-bit ADC digitizes node health signals (temperature, supply rail) for remote diagnostics. JTAG boundary-scan verifies solder integrity on high-I/O-count production boards. The 5 V core directly drives optocoupler LEDs used for galvanic isolation at network entry points, avoiding level-translation circuitry required with 3.3 V MCUs.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATMEGA645-16AUR — 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 | ATMEGA645-16AI | ATMEGA649-16AUR | ATMEGA64A-AU | AT90CAN64-16AU |
|---|---|---|---|---|---|
| Package | 64-TQFP (14x14) | 64-TQFP (14x14) - same | 64-TQFP (14x14) - same | 64-TQFP (14x14) - same | 64-TQFP (14x14) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| LCD Controller | No | No | Yes | No | No (CAN controller instead) |
| Special Peripherals | JTAG, 8-ch 10-bit ADC | JTAG, 8-ch 10-bit ADC (same die) | JTAG, ADC + LCD segment driver | JTAG, ADC (predecessor per AVR500) | CAN 2.0B controller |
| Pin Compatibility | Reference | Pin-to-pin identical | Same footprint, pin functions differ (LCD) | Pin compatible except a few pins (AVR500) | Same footprint, pin functions differ (CAN) |
Bảo phân biệt quan trọng
- More general-purpose I/O than the LCD sibling (vsATMEGA649-16AUR)
- Larger peripheral set than its predecessor (vsATMEGA64A-AU)
- General-purpose focus vs CAN specialization (vsAT90CAN64-16AU)
- Identical die availability across packaging (vsATMEGA645-16AU)
Ghi chú thiết kế
Estimated: at VCC=5.5 V and worst-case active current in the tens of mA class, decouple each VCC pin (pins 10, 63) with 100 nF ceramics placed within 5 mm, plus one 10 uF bulk capacitor. Keep AVCC (pin 53) connected to VCC through a low-pass filter (e.g., 100 nF plus 10 uH inductor) for ADC accuracy, and never let AVCC deviate more than 300 mV from VCC or the ADC readings and I/O on the analog port become invalid.
Set fuse bits carefully before first ISP programming: enabling the wrong clock-source fuses (e.g., selecting an external crystal when none is fitted) bricks the device to the point that a high-voltage parallel programmer is needed. Connect RESET (pin 58) with a 10 k pull-up; if the JTAGEN fuse is enabled, PC2-PC5 (JTAG pins) will not work as GPIO unless JTAG is disabled or reconfigured. Verify fuse settings against the Microchip datasheet before programming production boards.
At 16 MHz, keep XTAL1/XTAL2 traces short (under 10 mm) and place the crystal and its two load capacitors directly adjacent to pins 56/57 with a ground guard ring. Route the SPI ISP bus (PB4-PB6) away from switching-regulator nodes to prevent false clocking during in-circuit programming. For the JTAG interface on PC2-PC5, series 22-33 ohm resistors reduce ringing on longer traces to the debug header.
Use a solid ground plane on layer 2 beneath the 64-TQFP; connect both GND pins (11, 64) directly to it with short vias. The 14 x 14 mm TQFP has 0.5 mm pitch leads - specify an adequate solder-mask-defined land pattern per Microchip's package drawing and review stencil aperture design for the center region to avoid bridging between the four perimeter lead groups.
Thông tin tuân thủ
R suffix denotes RoHS-compliant, lead-free tape-and-reel packaging per Microchip ordering convention and DigiKey/Mouser listings. REACH, halogen-free, and conflict-minerals status not stated in the verified data - confirm on Microchip product page compliance documents.
