ATMEGA645V-8MUR - 8MHz AVR 64KB Flash MCU | Microchip
部品番号: ATMEGA645V-8MUR ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $2.77 | $2.77 |
| 10 | $2.62 | $26.20 |
| 100 | $2.41 | $241.00 |
| 500 | $2.19 | $1,095.00 |
| 1,000 | $1.98 | $1,980.00 |
ATMEGA645V-8MUR 概要
An 8-bit AVR microcontroller executes a rich RISC instruction set - 130 powerful instructions, most single-cycle - from a Harvard-architecture core that fetches instructions and data over separate buses. Within the power-management hierarchy, it sits as an embedded MCU integrating program memory, data memory, timers, ADC and serial peripherals on a single die.
Key features include in-system programmable (ISP) FLASH enabling firmware updates on the assembled PCB, four flexible timer/counters with PWM channels, an 8-channel 10-bit ADC, USART, SPI and two-wire (I2C) serial interfaces, and the JTAG interface for on-chip debug and boundary scan.
Architecturally, the AVR core achieves close to 1 MIPS per MHz, so the 8 MHz ATMEGA645V delivers roughly 8 MIPS while drawing only microamp-level current in power-down sleep mode, making the low-voltage V variant well suited to battery-powered systems.
Typical applications include battery-powered instrumentation, industrial sensors and control nodes, consumer appliances, and LCD-adjacent control tasks within the ATmega megaAVR family ecosystem.
When designing with this device, budget the 8 MHz ceiling against your algorithm's MIPS requirements, and remember the V grade trades maximum speed for a 1.8V low-voltage floor - a 5V 16 MHz system should choose the ATmega645-16 variant instead.
This page synthesizes distributor pricing, same-family drop-in alternatives, design notes, and long-tail search coverage not found in a single manufacturer datasheet.
ドロップイン代替品: ATMEGA645V-8MUR — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ATMEGA645V-8MUR （同一形状・フットプリント） — 相違点: Package, RoHS Status, Maximum Clock Frequency, EEPROM Size, Packaging.
クイック比較ツール — 並列比較する代替部品を選択:
ATMEGA645V-8MU
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ATMEGA645A-MUR
✅ ドロップイン✓ 在庫あり
$6.3 / 個
データシートを見る →ATMEGA645V-8MI
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ATMEGA649V-8MUR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ATMEGA325V-8MUR
✅ ドロップイン✓ 在庫あり
$2.19 / 個
データシートを見る →ATMEGA645-16MUR
✅ ドロップイン✓ 在庫あり
$3.35 / 個
データシートを見る →ATMEGA329V-8MI
✅ ドロップイン✓ 在庫あり
$5.45 / 個
データシートを見る →ATMEGA645V-8MUR 最大定格＆電気的特性
| Core Processor | AVR |
| Core Size | 8-Bit |
| Series | AVR ATmega |
| 最大クロック周波数 | 8 MHz |
| Program Memory Size | 64KB (32K x 16) FLASH |
| Program Memory Type | In-System Programmable FLASH |
| EEPROM Size | 2KB |
| RAM Size | 4KB SRAM |
| Operating Voltage Range | 1.8 V to 5.5 V (V grade) |
| Supply Voltage - Min | 1.8 V |
| Supply Voltage - Max | 5.5 V |
| ADC Resolution | 10-bit |
| Peripherals | Timer/Counters, PWM, Brown-out Detect/Reset, WDT |
| Communication Interfaces | USART, SPI, I2C (Two-Wire Interface), JTAG |
| パッケージ | 64-QFN (9x9 mm) Exposed Pad (64-VFQFN) |
| 実装タイプ | Surface Mount |
| Packing | Tape & Reel (R suffix) |
| RoHS ステータス | Green / RoHS compliant per FindIC listing |
ATMEGA645V-8MUR 64-qfn (9x9 mm) exposed pad (64-vfqfn) ピン配置ガイド
ATMEGA645V-8MUR (64-qfn (9x9 mm) exposed pad (64-vfqfn) パッケージ) のピン配置。 このデジタルICには、GPIO、通信インターフェース (UART、SPI、I2C)、および電源ピンが含まれています。代替ピン機能と設定オプションについては、メーカーのデータシートを参照してください。組み込みシステム設計とPCBレイアウトに不可欠です。
詳細なピン配置データはありません: ATMEGA645V-8MUR.
詳細は データシート をご参照ください。
主な用途
ATMEGA645V-8MUR の用途: 6 件s: Battery-Powered Portable Instruments, Industrial Sensor and Control Nodes, Consumer Appliance Control, Embedded Data Acquisition Systems, Access Control and Security Devices, IoT Sensor End Nodes.
Battery-Powered Portable Instruments
The ATMEGA645V-8MUR fits battery-powered instruments because its V grade guarantees full 8 MHz operation from 1.8V, so it keeps running on two-cell alkaline (3V) or a Li-ion cell near end-of-discharge. The AVR power-down sleep mode draws microamp-level standby current per the Microchip datasheet, extending battery life in handheld meters and data loggers. The 4KB SRAM buffers measurement samples while the 2KB EEPROM stores calibration data across power cycles. Placed on the same PCB with an onboard LDO and the 10-bit ADC sensing external sensors, the device sleeps between samples and wakes on interrupt; the trade-off is the 8 MHz ceiling, so heavy DSP filtering must be bounded to fit within the available MIPS.
おすすめ
Industrial Sensor and Control Nodes
In industrial sensing and control, the ATMEGA645V-8MUR provides a watchdog timer, brown-out detection, and 64KB ISP FLASH - enough code space for communication stacks and local control logic without external memory. Its USART connects to RS-485 transceivers for fieldbus nodes, the SPI port interfaces ADCs or EEPROM, and the two-wire I2C bus links environmental sensors, per the Microchip family datasheet peripheral set. The 9x9 mm exposed-pad QFN dissipates heat well on industrial PCBs, and the 1.8V to 5.5V supply range tolerates unregulated 5V logic rails with brown-out protection masking supply dips. Engineering consideration: reserve the JTAG port for field diagnostics in sealed enclosures, and clamp the ADC inputs against industrial transients.
おすすめ
Consumer Appliance Control
White goods and small appliance controllers benefit from the ATMEGA645V-8MUR's combination of 64KB FLASH for menu/UX code, PWM timer outputs for motor and heater control, and the low-cost 64-QFN footprint that shrinks PCB area inside compact control panels. Per Microchip's datasheet, four timer/counters generate multi-channel PWM for triac-driven motor speed control or relay-based heater staging, while the ADC reads temperature probes and user potentiometers. The 8 MHz clock keeps EMI low in mains-powered appliances, easing EMC compliance compared to faster parts, and the green/RoHS listing satisfies consumer environmental requirements. Designers should use the internal RC oscillator where precision allows, reserving a crystal for tasks needing accurate UART timing.
おすすめ
Embedded Data Acquisition Systems
The on-chip 10-bit ADC with multiple input channels makes the ATMEGA645V-8MUR a compact data-acquisition engine: analog inputs are sampled directly without an external converter, samples accumulate in 4KB SRAM, and the USART streams results upstream. According to the Microchip ATmega645V datasheet, the ADC can run from the internal reference with programmable prescaling, and the 64KB FLASH hosts averaging, scaling and simple FFT firmware. In a typical topology the MCU sleeps between timer-triggered conversions, achieving low average power in battery logger nodes. Performance consideration: the 10-bit resolution and ratiometric measurement are adequate for temperature, humidity and voltage logging, but precision applications should add an external higher-resolution ADC over SPI.
おすすめ
Access Control and Security Devices
Access-control readers and alarm panels use the ATMEGA645V-8MUR for its JTAG boundary-scan support in production test, 2KB EEPROM for key/credential storage, and brown-out-protected operation that prevents corrupted states during mains sag. Per the Microchip family datasheet, the two-wire interface connects RTC and secure EEPROM ICs, while USART links to keypads, RFID front-ends or GSM modems; the 64KB FLASH accommodates encryption routines and event logging. The 9x9 mm QFN suits compact reader housings, and the 1.8V floor allows a single-cell backup battery to maintain real-time functions during outages. Design tip: lock the boot-loader section via lock bits, and route the JTAG pads to a test header for manufacturing ICT without sacrificing security in the field.
おすすめ
IoT Sensor End Nodes
As an IoT endpoint, the ATMEGA645V-8MUR handles sensing, local preprocessing and packet framing before handing data to a wireless module through USART or SPI. The V grade's 1.8V operation matches coin-cell boost converters and low-voltage radio regulators, and microamp power-down plus fast wake-up keep the average duty-cycle current low - the classic battery-node energy budget described in Microchip's AVR power-management guidance. 64KB FLASH stores a full MQTT or proprietary protocol stack, and 4KB SRAM buffers retransmission queues during radio outage. Trade-off to plan for: at 8 MIPS the core suits occasional-sampling nodes rather than continuous streaming, so pair it with a radio that does framing in hardware to offload the MCU.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ATMEGA645V-8MUR — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ATMEGA645V-8MU | ATMEGA645A-MUR | ATMEGA649V-8MUR | ATMEGA325V-8MUR | ATMEGA645-16MUR |
|---|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) Exposed Pad | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (FLASH) | 64KB (32K x 16) | 64KB | 64KB | 64KB | 32KB | 64KB |
| Supply Voltage Range | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 4.5 V to 5.5 V |
| LCD Controller | No | No | No | Yes (segment LCD) | No | No |
| Packing | Tape & Reel (R suffix) | Tray | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel |
主な差別化要因
- Lowest published unit price among stocked listings （vs ATMEGA645V-8MU)
- Double the program memory vs the 325 sibling （vs ATMEGA325V-8MUR)
- Low-voltage battery operation the 16 MHz grade cannot match （vs ATMEGA645-16MUR)
- Lower cost than the LCD-equipped sibling when no display is needed （vs ATMEGA649V-8MUR)
設計ノート
The V grade permits 1.8V to 5.5V operation, but ADC accuracy degrades near the lower rail because the internal reference headroom shrinks. For battery nodes, estimate (arithmetic, not datasheet): a node sampling once per second for 10 ms at ~8 mA active and sleeping at microamp level averages well under 100 uA - verify with your own firmware profile. Add a 100 nF ceramic decoupling capacitor at each VCC pin pair plus 10 uF bulk near the exposed pad, per Microchip's ATmega hardware design guidance.
The 9x9 mm exposed-pad QFN requires the thermal pad soldered to a grounded copper pour with an array of thermal vias; an unpadded EP causes both thermal and ground-integrity problems. Keep the ISP and JTAG headers on the layout even if unpopulated in production, because in-system FLASH programming is this device's core field-update path. Place the reset pull-up (typically 10 kO) and brown-out configuration so the reset line stays clean during power ramps.
Two frequent mistakes with this part: first, selecting the V variant for a design that actually needs more than 8 MHz - the speed grade is hard-limited at 8 MHz across the whole supply range; move to ATMEGA645-16 (Site catalog part) at 5V if you need 16 MIPS. Second, using EEPROM calibration data without wear-leveling - the 2KB EEPROM is rated for limited write cycles, so throttle calibration writes. Also verify R-stackup timing when swapping between tray (ATMEGA645V-8MU) and Tape & Reel variants on SMT lines.
コンプライアンス情報
Green/RoHS-compliant, lead-free designation per LCSC and FindIC distributor listings. Formal REACH and conflict-minerals declarations require Microchip's official material declaration for this ordering code.
