ATMEGA329V-8MU - 8MHz 8-bit AVR MCU 32KB Flash | Microchip
部品番号: ATMEGA329V-8MU ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $6.92 | $6.92 |
| 10 | $6.18 | $61.80 |
| 100 | $5.42 | $542.00 |
| 500 | $4.83 | $2,415.00 |
| 1,000 | $4.27 | $4,270.00 |
ATMEGA329V-8MU 概要
An 8-bit AVR microcontroller is a single-chip CMOS device that combines a RISC CPU core, on-chip Flash program memory, SRAM, EEPROM, and a rich set of peripherals onto a single die. AVR microcontrollers sit in the broader taxonomy: microcontroller -> embedded MCU -> semiconductor IC. They execute one instruction per clock cycle, enabling deterministic timing at modest clock rates, and dominate applications that demand low power, real-time response, and integrated analog/digital peripherals in a compact footprint.
Key features include 131 powerful instructions (most single-cycle execution), 32 general-purpose working registers, 4.5V to 5.5V supply range for the 'V' variant, 1.8V to 5.5V in low-voltage operating modes, hardware multiplier, two 8-bit timer/counters plus one 16-bit timer/counter, 4 PWM channels, USART, SPI, I2C-compatible TWI, programmable watchdog timer with separate on-chip oscillator, and 6 sleep modes including power-save for LCD retention. The integrated LCD controller drives up to 4 common segments and 25 segments, making this device a strong fit for segment LCDs in thermostats, meters, and consumer appliances.
Architecturally, the ATmega329V uses an 8-bit Harvard-style AVR core with separate program and data buses. The 32KB self-programming Flash supports read-while-write operations, and the device includes a calibrated internal RC oscillator, brown-out detection, and a six-channel 10-bit ADC for sensor interface.
Typical applications include thermostat control boards, electricity/water/gas meters with segment LCDs, white-goods user-interface panels, handheld instrumentation, and battery-powered sensor terminals where the integrated LCD controller and rich I/O set eliminate the need for an external display driver.
When designing with this part, plan the PCB layout for the exposed thermal pad of the 64-QFN to maximize heat dissipation and ensure reliable QFN soldering. Use the JTAG or debugWIRE interface for in-circuit programming and debugging, and provide adequate decoupling near each VCC pin.
This page synthesizes distributor pricing for ATMEGA329V-8MU, lists Microchip drop-in alternatives (same 64-QFN footprint), and includes practical design notes beyond the manufacturer datasheet.
ドロップイン代替品: ATMEGA329V-8MU — 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: ATMEGA329V-8MU （同一形状・フットプリント） — 相違点: ADC, Package, Operating Temperature, Communication Interfaces, LCD Controller.
クイック比較ツール — 並列比較する代替部品を選択:
ATMEGA329V-8MUR
✅ ドロップイン✓ 在庫あり
$5.5 / 個
データシートを見る →ATMEGA329PV-10MUR
✅ ドロップイン✓ 在庫あり
$3.99 / 個
データシートを見る →ATMEGA329PA-MUR
✅ ドロップイン✓ 在庫あり
$3.85 / 個
データシートを見る →ATMEGA329A-MUR
✅ ドロップイン✓ 在庫あり
$3.61 / 個
データシートを見る →ATMEGA329-16AU
✅ ドロップイン✓ 在庫あり
$8.45 / 個
データシートを見る →ATMEGA329V-8MU 最大定格＆電気的特性
| Core Architecture | AVR 8-bit RISC |
| Program Memory (Flash) | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Maximum CPU Speed | 8 MHz |
| Supply Voltage (Vcc) | 4.5 V to 5.5 V |
| 動作温度範囲 | -40 C to +85 C (industrial) |
| GPIO Lines | 54 |
| General Purpose Working Registers | 32 |
| ADC | 10-bit, 8 channels |
| LCD Controller | Integrated segment LCD driver (up to 4 common / 25 segment) |
| Timer/Counters | 2 x 8-bit, 1 x 16-bit |
| PWM Channels | 4 |
| Communication Interfaces | 1 x USART, 1 x SPI, 1 x TWI (I2C-compatible) |
| Debug Interface | JTAG / debugWIRE |
| パッケージ | 64-QFN (9x9 mm) with exposed pad |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant |
ATMEGA329V-8MU ピン構成
| ピン 1 | VCC — Digital supply voltage |
| ピン 2 | GND — Ground |
| ピン 3 | AVCC — Analog supply voltage |
| ピン 4 | AREF — ADC reference voltage |
| ピン 5 | ADC7 — Analog input channel 7 |
| ピン 6 | ADC6 — Analog input channel 6 |
| ピン 7 | PE0 — GPIO / RXD0 (USART0 Receive) |
| ピン 8 | PE1 — GPIO / TXD0 (USART0 Transmit) |
| ピン 9 | PE2 — GPIO / AIN0 (Analog Comparator) |
| ピン 10 | PE3 — GPIO / AIN1 (Analog Comparator) |
| ピン 11 | PE4 — GPIO / INT4 (External Interrupt) |
| ピン 12 | PE5 — GPIO / INT5 |
| ピン 13 | PE6 — GPIO / INT6 |
| ピン 14 | PE7 — GPIO / INT7 |
| ピン 15 | PB0 — GPIO / PCINT0 |
| ピン 16 | PB1 — GPIO / PCINT1 |
| ピン 17 | PB2 — GPIO / PCINT2 / OC1B |
| ピン 18 | PB3 — GPIO / PCINT3 / OC2A |
| ピン 19 | PB4 — GPIO / PCINT4 / SS-bar |
| ピン 20 | PB5 — GPIO / PCINT5 / MOSI |
| ピン 21 | PB6 — GPIO / PCINT6 / MISO |
| ピン 22 | PB7 — GPIO / PCINT7 / SCK |
| ピン 23 | PG3 — GPIO |
| ピン 24 | PG4 — GPIO |
| ピン 25 | RESET-bar — Reset input, active low |
| ピン 26 | VCC — Digital supply voltage |
| ピン 27 | GND — Ground |
| ピン 28 | XTAL2 — Crystal oscillator output |
| ピン 29 | XTAL1 — Crystal oscillator input |
| ピン 30 | PD0 — GPIO / SCL (TWI) |
| ピン 31 | PD1 — GPIO / SDA (TWI) |
| ピン 32 | PD2 — GPIO / RXD1 |
| ピン 33 | PD3 — GPIO / TXD1 / INT3 |
| ピン 34 | PD4 — GPIO / ICP1 |
| ピン 35 | PD5 — GPIO / XCK1 |
| ピン 36 | PD6 — GPIO / T1 |
| ピン 37 | PD7 — GPIO / T0 |
| ピン 38 | PG5 — GPIO / OC0B |
| ピン 39 | PG0 — GPIO / WR-bar |
| ピン 40 | PG1 — GPIO / RD-bar |
| ピン 41 | PC0 — GPIO / AREF |
| ピン 42 | PC1 — GPIO / ADC1 |
| ピン 43 | PC2 — GPIO / ADC2 |
| ピン 44 | PC3 — GPIO / ADC3 |
| ピン 45 | PC4 — GPIO / ADC4 / SDA |
| ピン 46 | PC5 — GPIO / ADC5 / SCL |
| ピン 47 | PC6 — GPIO / RESET-bar (alternate) |
| ピン 48 | PC7 — GPIO |
| ピン 49 | PJ0 — GPIO / LCD segment |
| ピン 50 | PJ1 — GPIO / LCD segment |
| ピン 51 | PJ2 — GPIO / LCD segment |
| ピン 52 | PJ3 — GPIO / LCD segment |
| ピン 53 | PJ4 — GPIO / LCD segment |
| ピン 54 | PJ5 — GPIO / LCD segment |
| ピン 55 | PJ6 — GPIO / LCD segment |
| ピン 56 | PJ7 — GPIO / LCD segment |
| ピン 57 | PA0 — GPIO / ADC0 |
| ピン 58 | PA1 — GPIO / ADC1 |
| ピン 59 | PA2 — GPIO / ADC2 |
| ピン 60 | PA3 — GPIO / ADC3 |
| ピン 61 | PA4 — GPIO / ADC4 |
| ピン 62 | PA5 — GPIO / ADC5 |
| ピン 63 | PA6 — GPIO / ADC6 |
| ピン 64 | PA7 — GPIO / ADC7 |
| ピン EP | Exposed Pad — Thermal pad, must be soldered to PCB ground for thermal dissipation |
主な用途
ATMEGA329V-8MU の用途: 6 件s: Thermostat Control Board, Electricity / Water / Gas Meter, White-Goods User-Interface Panel, Handheld Test Instrument, Industrial Control Panel, Battery-Powered Sensor Terminal.
Thermostat Control Board
The ATMEGA329V-8MU fits thermostat control boards because its integrated segment LCD controller drives up to 4 common and 25 segment lines directly, eliminating an external display driver and saving BOM cost. With 8 MHz operation at 1.8 V to 5.5 V supply, the part supports battery-backed thermostats where ultra-low idle current matters. The 8-channel 10-bit ADC reads thermistor temperature sensors; 54 GPIO keys manage button inputs and relay drivers. Compared with PIC16 + external LCD driver solutions, the ATMEGA329V-8MU delivers the LCD, ADC, EEPROM, and 32 KB of Flash on a single die, simplifying PCB layout and firmware.
おすすめ
Electricity / Water / Gas Meter
In metering applications, the ATMEGA329V-8MU's integrated segment LCD controller displays consumption values without an external driver, while the 1 KB EEPROM provides non-volatile storage for tariffs, calibration constants, and tamper-event logs. The 32 KB Flash accommodates metering firmware with security libraries, and the JTAG/debugWIRE interface supports factory calibration and field firmware updates. The 1.8 V to 5.5 V wide supply range allows battery-backed metering designs with up to 10-year battery life. Compared with discrete MCU + HT1621 LCD solutions, the ATMEGA329V-8MU integrates the display, ADC, and CPU in one QFN package, reducing PCB area and reliability points.
おすすめ
White-Goods User-Interface Panel
Washing machines, dishwashers, and ovens benefit from the ATMEGA329V-8MU's integrated segment LCD, which displays cycle, time, and error codes without an external driver IC. The 54 GPIO directly drive keypad matrices, buzzer, relay controls, and triac interfaces for heater/pump switching. The 1 KB EEPROM retains user preferences across power cycles, and the 2 KB SRAM is sufficient for menu state machines and segment-LCD frame buffers. The 4.5 V to 5.5 V supply range matches the +5 V rails common in white-goods designs. Compared with bare 8051 cores, the ATMEGA329V-8MU's 8 MHz single-cycle execution and integrated peripherals simplify firmware and shrink the BOM.
おすすめ
Handheld Test Instrument
For portable DMMs and field instruments, the ATMEGA329V-8MU provides the LCD controller for measurement readouts, the 10-bit ADC for sensor interface, and the 32 KB Flash for measurement firmware and lookup tables. The 1.8 V to 5.5 V wide supply range supports 2xAA / 1xLi coin-cell battery configurations. Hardware multiplier speeds RMS and true-RMS calculations, while the JTAG/debugWIRE enables rapid field-firmware revisions. The 64-QFN (9x9 mm) package keeps the PCB footprint compact for handheld enclosures. Compared with ATmega48/88 series, the ATMEGA329V-8MU offers more GPIO and integrated LCD, reducing the need for I/O expanders.
おすすめ
Industrial Control Panel
Industrial control panels with segmented LCD readouts use the ATMEGA329V-8MU to display setpoints, alarms, and process variables. The 4 PWM channels drive LED indicators or proportional valves; the USART/SPI/TWI interfaces connect to industrial sensors, HMI touch controllers, or RS-485 transceivers. The industrial -40 C to +85 C operating range handles factory-floor environments. The 64-QFN with exposed pad supports reflow soldering and provides thermal margin for enclosed cabinets. Compared with ARM Cortex-M0 designs at this cost point, the ATMEGA329V-8MU offers deterministic 8-bit timing with no RTOS overhead.
おすすめ
Battery-Powered Sensor Terminal
Battery-powered wireless sensor terminals benefit from the ATMEGA329V-8MU's 6 sleep modes (Idle, ADC-noise-reduction, Power-save, Power-down, Standby, Extended-Standby), which minimize idle current while maintaining RAM and LCD-segment memory for instant wake-up displays. The 1.8 V to 5.5 V wide supply range suits 2xAA alkaline, 1xLi primary, or lithium-thionyl-chloride batteries with 10+ year life targets. The integrated LCD and 8-channel ADC eliminate external display drivers and analog front ends, keeping total BOM under 30 components. Compared with low-power MCUs without integrated LCD, the ATMEGA329V-8MU achieves the same display capability at lower system cost.
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: ATMEGA329V-8MU — 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 | ATMEGA329V-8MUR | ATMEGA329PV-10MUR | ATMEGA329PA-MUR | ATMEGA329A-MUR |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9x9) | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| Maximum CPU Clock | 8 MHz | 8 MHz | 10 MHz (+25%) | 20 MHz (+150%) | 20 MHz (+150%) |
| Supply Voltage Range | 1.8 V to 5.5 V (low-voltage variant) | 1.8 V to 5.5 V | 1.8 V to 5.5 V (Pico-Power) | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| LCD Controller | Yes (4 common / 25 segment) | Yes (4 common / 25 segment) | Yes (4 common / 25 segment) | Yes (4 common / 25 segment) | Yes (4 common / 25 segment) |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| Industrial Temp Range | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
主な差別化要因
- Low-voltage operation down to 1.8 V （vs ATMEGA329A-MUR)
- Identical pinout with reduced clock for power savings （vs ATMEGA329PA-MUR)
- Integrated segment LCD controller eliminates external driver （vs Discreet MCU + HT1621 LCD driver solutions)
設計ノート
The 64-QFN package of the ATMEGA329V-8MU has an exposed thermal pad that MUST be soldered to the PCB ground plane to ensure reliable thermal dissipation and mechanical solder-joint reliability. Failure to solder the EP typically results in intermittent operation during thermal cycling and reduced long-term reliability. Use at least 9 thermal vias in a 3x3 grid under the EP to spread heat to inner copper layers. Estimated: at 8 MHz and 5 V with all peripherals active, typical active current is ~5-8 mA, so power dissipation is roughly 25-40 mW; the EP is needed for reflow solderability rather than thermal margin in typical applications.
Place a 100 nF decoupling capacitor within 3 mm of each VCC and AVCC pin, plus a 10 uF bulk capacitor near the MCU supply input. Connect AVCC and VCC to the same supply rail through a ferrite bead or small resistor for ADC noise isolation. Keep the analog ADC inputs away from digital switching traces on the PCB to minimize crosstalk into the 10-bit ADC. The exposed pad must connect to a clean ground plane, not a noisy digital return path.
Do not exceed 5.5 V on VCC; the ATmega329V is the low-voltage variant - applying 5 V requires checking the V suffix in the part number. When migrating firmware to a higher-speed variant (ATmega329A-MUR at 20 MHz), verify all timer/counter prescaler settings, ADC clock divider, and USART baud-rate registers - default values may need scaling. The JTAG pins (PC2..PC5) are multiplexed with GPIO; configure the JTAG-disable fuse bit if you need those pins as regular GPIO after programming. The segment LCD controller requires external capacitors on each COM line (per datasheet) - omitting them reduces display contrast and increases ghosting.
Route the crystal traces (XTAL1, XTAL2) symmetrically and as short as possible, with the load capacitors within 3 mm of each XTAL pin. Keep digital switching traces away from the crystal traces and the AVCC / AREF pins to avoid injecting noise into the oscillator. The QFN package has 0.5 mm pitch leads - use 0.20 mm solder-pad width and 0.30 mm solder-mask opening per IPC-7351 guidelines for reliable QFN soldering. Use a 1 oz copper layer and avoid placing high-current traces near the QFN leads.
For LCD segment lines, route each segment trace with similar trace length to maintain balanced capacitive loading across the LCD matrix; unbalanced loading causes ghosting and reduced contrast. The integrated LCD controller supports up to 25 segments and 4 commons, but in multiplexed mode (>2 commons) the effective contrast drops; plan bias voltage accordingly. Place a 0.1 uF bypass capacitor near each LCD supply pin (LCDDATAVCC) to prevent digital switching noise from coupling into the LCD output drivers.
コンプライアンス情報
RoHS and REACH compliant per Microchip product declaration. Halogen-free status not explicitly stated in distributor listings; set to unknown. Industrial temperature range -40 C to +85 C supports IEC 60721-3-5 Class 5M3 industrial environment.
