ATMEGA329-16MUR - 32KB Flash 16MHz AVR MCU, 64-QFN | Microchip
N.º da peça: ATMEGA329-16MUR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $6.22 | $6,22 |
| 10 | $5.6 | $56,00 |
| 100 | $4.98 | $498,00 |
| 500 | $4.45 | $2.225,00 |
| 1.000 | $3.95 | $3.950,00 |
ATMEGA329-16MUR Visão geral
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, sitting within the broader hierarchy of embedded processors: microcontroller -> embedded processor -> semiconductor device. The AVR ATmega family is widely used for cost-sensitive embedded control where flash self-programming, low power modes, and rich peripherals are required without an external memory bus.
Key features include 131 powerful instructions with mostly single-cycle execution, read-while-write self-programming flash, 32 general purpose working registers, an on-chip 10-bit ADC with up to 8 channels, and an integrated segment LCD driver that eliminates an external LCD controller. These capabilities reduce bill-of-materials cost in battery-meter, metering, and panel-display designs.
Technically, the ATmega329 combines an AVR core running up to 16 MIPS at 16 MHz with six power-saving modes, including power-down at very low current. The JTAG boundary-scan capability complies with IEEE 1149.1-style test access for board-level test, and in-circuit serial programming (ICSP) via SPI simplifies production programming. The 64-QFN 9x9 mm, 0.8 mm pitch package suits compact two-layer and four-layer boards with good thermal dissipation through the exposed pad.
Typical applications include LCD-equipped industrial panels, utility and energy metering front ends, building automation controllers, and consumer appliances requiring segment-LCD user interfaces. The ADC and analog comparator support sensor acquisition tasks directly.
Design consideration: this is the 16 MHz / 4.5V to 5.5V speed-voltage grade; for 2.7V to 5.5V systems at up to 10 MHz, the ATmega329V variant must be selected instead, as the -16 suffix guarantees full timing only within 4.5V to 5.5V.
This page synthesizes distributor pricing, drop-in alternatives, design notes, and FAQ content not found in the manufacturer datasheet, giving engineers a single citable reference for the ATMEGA329-16MUR.
Alternativas drop-in para ATMEGA329-16MUR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com ATMEGA329-16MUR (mesmo formato e footprint) — diferindo em Package, Instructions, Supply Voltage Range, EEPROM, EEPROM Size.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ATMEGA329P-16MUR
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ATMEGA3290-16MUR
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ATMEGA325-16MUR
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$3.28 / unidade
Ver ficha técnica →ATMEGA3250-16MUR
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ATMEGA649-16MUR
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$7.6 / unidade
Ver ficha técnica →ATMEGA329-16MUR Classificações máximas e características elétricas
| Core | AVR 8-bit RISC |
| Frequência máxima de clock | 16 MHz |
| Flash Program Memory | 32 KB (16K x 16) |
| EEPROM | 1 KB |
| SRAM | 2 KB |
| Supply Voltage Range | 4.5 V to 5.5 V |
| General Purpose I/O | 54 lines |
| ADC Resolution | 10-bit |
| LCD Controller | Segment LCD, 25 segments x 4 commons |
| JTAG Interface | Yes (on-chip debug and boundary scan) |
| Instructions | 131 instructions, mostly single-cycle |
| Encapsulamento | 64-QFN (9x9 mm), 0.8 mm pitch, exposed pad |
| Tipo de montagem | Surface Mount |
| Programming Interface | ISP / ICSP via SPI, JTAG |
| Status do ciclo de vida | Active |
Guia de Configuração de Pinos do ATMEGA329-16MUR 64-qfn (9x9 mm), 0.8 mm pitch, exposed pad
Configuração de pinos para ATMEGA329-16MUR (pacote 64-qfn (9x9 mm), 0.8 mm pitch, exposed pad). Este CI digital inclui GPIO, interfaces de comunicação (UART, SPI, I2C) e pinos de alimentação. Consulte o datasheet do fabricante para funções alternativas dos pinos e opções de configuração. Essencial para projeto de sistemas embarcados e layout de PCB.
Nenhum dado detalhado de pinagem disponível para ATMEGA329-16MUR.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
ATMEGA329-16MUR é adequado para 6 aplicaçãos: Utility and Energy Metering Displays, Industrial Control Panels with LCD Interface, Building Automation and HVAC Controllers, Consumer Appliance User Interfaces, Handheld Test and Measurement Instruments, Point-of-Sale and Vending Machine Controllers.
Utility and Energy Metering Displays
The ATMEGA329-16MUR fits utility metering products because its integrated segment LCD controller drives up to 25 segments x 4 commons directly from the MCU, eliminating a separate LCD driver IC and its wiring. The 10-bit ADC digitizes shunt or divider voltage/current sensing channels, while the 1 KB EEPROM stores calibration coefficients and billing data across power cycles. Operating at 4.5V to 5.5V and up to 16 MHz, it processes tariff calculations in real time, and the read-while-write flash supports field firmware updates. In battery-backup scenarios, the power-save mode can keep the LCD running with the core clock stopped, trading a modest current draw for a continuously visible reading - a quantified benefit over MCUs that require an external driver and cannot maintain display state during sleep.
Recomendado
Industrial Control Panels with LCD Interface
In industrial panels, the ATMEGA329-16MUR combines human-interface LCD driving with robust control I/O: 54 general purpose lines handle relays, keys, and limit switches while the same device renders status on a segment LCD. The AVR core delivers 16 MIPS at 16 MHz, sufficient for scan-cycle control logic and debouncing in a single chip. The JTAG interface enables boundary-scan board test and on-chip debugging during commissioning, reducing bring-up time on multi-layer panels. Its 5V-tolerant 4.5V-5.5V supply matches legacy industrial 5V logic directly, avoiding level shifters. Because the 64-QFN exposed pad dissipates heat into the PCB, the MCU sustains heavy I/O loading without a heatsink, a practical benefit in sealed panel enclosures where airflow is limited and ambient temperatures rise above office-grade levels.
Recomendado
Building Automation and HVAC Controllers
Building automation nodes benefit from the ATMEGA329-16MUR's blend of LCD interface, 10-bit ADC, and UART/SPI connectivity. The ADC reads temperature and humidity sensor channels at 10-bit resolution, the EEPROM retains setpoint and schedule tables through power outages, and the UART links to RS-485 transceivers for Modbus-style networks. At 16 MHz the core handles communication framing and control loops concurrently. The segment LCD shows setpoints and fault codes without a graphics controller, keeping BOM cost low across large installed bases. The six power-saving modes allow the display to stay live in power-save while CPU-intensive tasks sleep, cutting average consumption in wall-mounted thermostats. The 64-QFN 9x9 mm footprint fits compact thermostat PCBs with room for the RS-485 and relay circuitry.
Recomendado
Consumer Appliance User Interfaces
Washing machines, ovens, and other appliances need a cheap, reliable display-and-control MCU, exactly the niche the ATMEGA329-16MUR occupies. Its on-chip LCD driver renders cycle status and error codes on glass segment LCDs, while 54 I/O lines directly drive TRIAC gates, relays, buzzers, and the key matrix. The 5V supply and industrial heritage give noise margin in electrically harsh environments with motor switching and relay arcing. EEPROM storage preserves user preferences and cycle counters for service diagnostics. ISP flash programming allows one firmware image per appliance model, simplifying manufacturing. Compared with a discrete LCD-driver-plus-MCU solution, the single-chip approach removes one IC, one crystal, and associated PCB area - a measurable cost and reliability gain in high-volume appliance production lines.
Recomendado
Handheld Test and Measurement Instruments
Entry-level handheld meters and testers use the ATMEGA329-16MUR to merge measurement and display functions. The 10-bit ADC samples voltage and current inputs; a precision voltage reference can be connected to the AREF pin for calibration-grade readings. The JTAG port is particularly valuable here: engineers can set on-chip breakpoints during calibration firmware development, and manufacturers can perform boundary-scan test on assembled boards. The LCD controller displays readings and unit indicators, and the EEPROM holds per-unit calibration factors written at end-of-line. Running at 16 MIPS, the core executes averaging and linearization math in real time. The 9x9 mm 64-QFN balances pin count against size so the instrument stays ergonomic, and the exposed pad grounds the die for improved analog noise performance in ADC readings.
Recomendado
Point-of-Sale and Vending Machine Controllers
Vending and POS boards use the ATMEGA329-16MUR for price display, keypad scanning, and actuator control in one device. The segment LCD shows prices and credit balance; 54 I/O lines drive motors, coin acceptor inputs, and bill validator handshaking. The 2 KB SRAM buffers transaction state, while EEPROM logs cumulative sales for route operators. ISP flash supports firmware updates in the field through the service UART, and JTAG assists factory diagnostics. The 4.5V to 5.5V supply rides through vending machine supply sags better than 3.3V-only MCUs, and the AVR's single-cycle instruction set keeps debounce and motor timing routines deterministic. The 64-QFN package withstands vibration typical of coin mechanisms when the exposed pad is soldered to a grounded pour.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ATMEGA329-16MUR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ATMEGA329P-16MUR | ATMEGA3290-16MUR | ATMEGA325-16MUR | ATMEGA649-16MUR |
|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) | 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 |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 64 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 4 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 2 KB |
| LCD Controller | 25 segments x 4 commons | 25 x 4 (same) | 100 x 4 | None | 25 x 4 |
| Max Clock / Supply | 16 MHz, 4.5-5.5 V | 16 MHz, 4.5-5.5 V | 16 MHz, 4.5-5.5 V | 16 MHz, 4.5-5.5 V | 16 MHz, 4.5-5.5 V |
| Low-Power Feature | 6 power-saving modes | 6 modes + picoPower lower sleep current | 6 power-saving modes | 6 power-saving modes | 6 power-saving modes |
Principais diferenciais
- Integrated segment LCD controller (vs ATMEGA325-16MUR)
- JTAG on-chip debug and boundary scan (vs ATMEGA328P-MU)
- Rich I/O count for control applications (vs ATMEGA328P-MU)
- Honest trade-off: narrow 5V supply window (vs ATMEGA328P-MU)
Notas de projeto
The -16 speed grade guarantees 16 MHz operation only from 4.5V to 5.5V. If the board can drop below 4.5V (for example during brownout or battery backup), the MCU may violate timing and execute instructions out of specification. Add a supply supervisor on RESET, or select the ATMEGA329V variant rated 2.7V-5.5V at reduced clock. Decouple VCC with 100 nF ceramic caps at each supply pin pair plus 10 uF bulk; connect the exposed pad to a solid ground plane for both thermal and noise performance.
The 64-QFN 9x9 mm package uses a 0.8 mm pitch and an exposed thermal pad; the PCB land pattern must include an aperture matching the pad with an array of thermal vias (typically 4x4) to the ground plane for reliable soldering. With 54 I/O lines shared between LCD segments and digital functions, plan pin multiplexing in the schematic stage - changing an LCD segment to GPIO later may force a PCB respin. Keep the JTAG header footprint on the board even if unused, to preserve in-circuit debug access.
The 16 MHz internal operation assumes a crystal or the calibrated RC oscillator; the calibrated RC is factory-tuned but less accurate, so UART baud rates above 57600 typically require a crystal. Also, the ATmega329 is not code-compatible at the LCD register level with the ATmega325 or ATmega328P, so firmware ports require updating LCD driver code. Verify the exact device signature during programming - ISP programmers will reject a wrong-device selection, but JTAG flash tools may not.
Estimated: at 16 MHz with 5V supply and heavily loaded I/O, AVR core current draw is typically in the 10-20 mA range (datasheet active-mode figure governs), giving roughly 100 mW internal dissipation - trivial for the 64-QFN with exposed pad. Thermal design effort should focus on external drivers (LCD bias, relays), not this MCU, provided the exposed pad is well soldered to a ground pour with several vias.
Informações de conformidade
Compliance data not present in the provided verified web data; consult the official Microchip product page or environmental datasheet for RoHS/REACH status.
