ATMEGA329-16MU - 8-Bit AVR MCU 16MHz 32KB LCD | Microchip
N.º da peça: ATMEGA329-16MU ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $4.29 | $4,29 |
| 10 | $3.86 | $38,60 |
| 100 | $3.44 | $344,00 |
| 500 | $3.1 | $1.550,00 |
| 1.000 | $2.78 | $2.780,00 |
ATMEGA329-16MU Visão geral
A microcontroller (MCU) is a single integrated circuit that combines a processor core, memory, and programmable peripherals into one chip, forming the lowest programmable layer of an embedded system hierarchy that ranges from discrete logic up to full application processors. The AVR family, originally developed by Atmel and now part of Microchip Technology, is an advanced RISC architecture executing 131 powerful instructions, most in a single clock cycle, with 32 general-purpose working registers directly connected to the ALU.
Key features of the ATMEGA329 include 54 general purpose I/O lines, an on-chip LCD controller capable of driving up to 25 segments x 4 commons, a JTAG interface for on-chip debugging and programming, read-while-write self-programming Flash, and an 8-channel 10-bit ADC. Supply voltage is 4.5 V to 5.5 V for the 16 MHz speed grade, fitting standard 5 V industrial rails.
The Harvard architecture separates program and data buses, allowing fetch and execution in parallel and delivering up to 16 MIPS throughput at 16 MHz. In-System Programmable Flash permits firmware updates over SPI without removing the device from the PCB, and the JTAG boundary-scan capability supports production test flows.
Typical applications include utility metering with segmented LCD displays, industrial control panels, battery-powered instrumentation, and building automation front-ends, where the integrated LCD controller removes the need for a separate LCD driver IC.
When designing, verify that the 4.5 V to 5.5 V supply window is met before running at the full 16 MHz clock; for 3 V systems choose the V speed grade variant instead.
This page synthesizes verified distributor data, drop-in same-family alternatives, and practical design guidance not consolidated in the manufacturer datasheet.
Alternativas drop-in para ATMEGA329-16MU — 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 ATMEGA329-16MU (mesmo formato e footprint) — diferindo em Package, Instructions, ADC, Number of I/O, RoHS Status.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ATMEGA329P-16MU
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ATMEGA3290-16MU
✅ 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 →ATMEGA325PV-10MU
✅ Drop-In✓ Em estoque
$2.19 / unidade
Ver ficha técnica →ATMEGA325PA-MUR
✅ Drop-In✓ Em estoque
$1.65 / unidade
Ver ficha técnica →ATMEGA329-16MU Classificações máximas e características elétricas
| Core Architecture | AVR 8-bit RISC |
| Clock Speed | 16 MHz |
| Flash Memory | 32 KB (16K x 16), ISP, self-programming |
| EEPROM | 1 KB |
| SRAM | 2 KB |
| Instructions | 131 (most single-cycle) |
| Throughput | Up to 16 MIPS at 16 MHz |
| Tensão de alimentação | 4.5 V to 5.5 V |
| General Purpose I/O | 54 lines |
| LCD Controller | Up to 25 segments x 4 commons |
| ADC | 10-bit |
| Debug Interface | JTAG (on-chip debug, boundary scan) |
| Working Registers | 32 x 8-bit general purpose |
| Encapsulamento | 64-QFN (MLF), 9 x 9 mm |
| Tipo de montagem | Surface Mount |
| Lifecycle Stage | ACTIVE |
Guia de Configuração de Pinos do ATMEGA329-16MU 64-qfn (mlf), 9 x 9 mm
Configuração de pinos para ATMEGA329-16MU (pacote 64-qfn (mlf), 9 x 9 mm). 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 ATMEGA329-16MU.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
ATMEGA329-16MU é adequado para 6 aplicaçãos: Utility and Panel Metering, Industrial Control Panels, Battery-Powered Instrumentation, Building Automation Front-Ends, Embedded Training and Legacy AVR Platforms, Test and Measurement Fixtures.
Utility and Panel Metering
The ATMEGA329-16MU fits utility metering front-ends because its integrated LCD controller drives up to 25 segments x 4 commons directly, eliminating a discrete LCD driver IC and its associated trace routing. The 10-bit ADC captures analog measurements from current transformers or voltage dividers, while 32 KB of self-programmable Flash stores calibration tables and logging firmware. Running from a 5 V industrial rail at 16 MHz, the device delivers 16 MIPS of headroom for digital signal processing on metering samples. Designers should budget the LCD contrast pins and use the EEPROM (1 KB) for tamper and calibration records, updating it through the read-while-write interface so measurements continue during parameter writes.
Recomendado
Industrial Control Panels
In industrial control panels the ATMEGA329-16MU provides 54 GPIO lines, enough to directly drive relays, keypads, and status LEDs while the LCD controller renders setpoints and alarm codes on a segmented display. The JTAG interface supports boundary-scan production test of assembled panels, reducing manual in-circuit test fixtures, and enables in-system debugging during commissioning. The 4.5 V to 5.5 V supply range matches standard 5 V PLC-style logic rails without level shifting. Firmware stored in 32 KB ISP Flash can be field-updated over SPI during service windows, and the 1 KB EEPROM retains configuration across power cycles, making the part a compact single-chip HMI and sequencer for machinery front-ends.
Recomendado
Battery-Powered Instrumentation
For battery-operated instruments the ATMEGA329-16MU pairs its LCD controller with the AVR's active-low-power architecture so the display can run from the same MCU that samples sensors through the 10-bit ADC. Instruments such as handheld meters and data loggers benefit from the picoPower successor ATMEGA329P when sleep current dominates battery life; the base -16MU remains appropriate for instruments with a permanent mains supply and battery backup. The 32 KB Flash accommodates complex acquisition and display firmware, while 2 KB SRAM buffers sample streams. Designers should exploit the JTAG interface during low-power tuning, and use the 16 MHz clock only during active measurement bursts to minimize energy per reading.
Recomendado
Building Automation Front-Ends
Building automation nodes such as room controllers and thermostat front-ends use the ATMEGA329-16MU to merge a segmented LCD user interface with sensing and actuation in one 64-QFN device. The 54 GPIO lines interface occupancy sensors, valve drives, and keypads, while the LCD controller presents temperature setpoints and schedules. The 10-bit ADC digitizes NTC thermistors for zone-temperature feedback, and the 1 KB EEPROM stores schedules and learned offsets through power outages. JTAG-based field diagnostics help service technicians flash firmware updates without desoldering. Because HVAC controllers typically run from 5 V rails, the 4.5 V to 5.5 V operating window fits the existing supply architecture without a regulator change.
Recomendado
Embedded Training and Legacy AVR Platforms
The ATMEGA329-16MU is a common choice for legacy AVR teaching platforms and retrofit projects because the ATmega family is supported by the open-source MegaCore Arduino hardware package, which explicitly lists ATmega329 among its supported devices. Students and maintainers can develop in the Arduino IDE or AVR-GCC while using JTAG hardware debugging - a capability missing from smaller ATmega328 boards. The 131-instruction RISC core with 32 working registers is an accessible architecture for teaching computer organization, and the LCD controller provides an immediate visual output peripheral without extra hardware. Retrofits of existing Atmel-based products also reuse this exact die when original firmware binaries must be preserved.
Recomendado
Test and Measurement Fixtures
Bench fixtures and production test rigs use the ATMEGA329-16MU as a display-and-control engine: the LCD controller shows pass/fail codes and measurement values, while 54 GPIO lines route multiplexers and drive relays. The 16 MHz clock supports timing-critical stimulus generation, and the 10-bit ADC provides coarse go/no-go analog verification before dedicated instrumentation takes over. Boundary-scan capability via JTAG lets the fixture also test the DUT board interconnects, consolidating two test stages. Because fixtures are mains-powered, the 5 V supply requirement is non-limiting, and the ISP Flash supports frequent fixture firmware revisions as product test plans evolve across production lots.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ATMEGA329-16MU — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ATMEGA329P-16MU | ATMEGA3290-16MU | ATMEGA325-16MU | ATMEGA325PV-10MU |
|---|---|---|---|---|---|
| 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 |
| Max Clock Speed | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 10 MHz |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| Supply 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 | 1.8 V to 5.5 V |
| LCD Controller | Up to 25 segments x 4 commons | Up to 25 segments x 4 commons | Expanded segment map (family max) | Yes (different segment allocation) | Yes (different segment allocation) |
| PicoPower Technology | No (standard ATmega329) | Yes | No | No | Yes |
| JTAG Debug / Boundary Scan | Yes | Yes | Yes | Yes | Yes |
Principais diferenciais
- Integrated LCD controller on-chip (vs ATMEGA328P-MU)
- JTAG boundary-scan and on-chip debug (vs ATMEGA328P-MU)
- Trade-off: standard (non-picoPower) power architecture (vs ATMEGA329P-16MU)
- 16 MHz / 5 V speed grade for industrial 5 V rails (vs ATMEGA325PV-10MU)
Notas de projeto
The ATMEGA329-16MU is specified for 4.5 V to 5.5 V at the 16 MHz speed grade; running below 4.5 V violates the frequency-voltage derating curve in the AVR datasheet and can cause marginal instruction execution at full clock. If your system rail is 3.3 V or lower, switch to a V speed grade (e.g. ATMEGA325PV-10MU with 1.8 V to 5.5 V) rather than overclocking the 16MU variant at reduced voltage. Add 100 nF decoupling at each supply pad pair of the 64-QFN plus one bulk 4.7 uF capacitor, keeping the loop area small because the MLF pad ring carries the majority of supply current.
The 64-pad QFN (9 x 9 mm) has a center exposed pad that should be soldered to a grounded or floating thermal land per the Microchip MLF application note - do not leave it unsoldered, as it improves both thermal performance and mechanical anchor. Use via stitching under the pad for inspection access, since MLF pads are hidden after assembly. Segment lines shared between LCD drive and GPIO should route away from the 10-bit ADC input traces to prevent display-drive coupling into analog measurements; ground-guard the ADC channel traces.
The JTAG pins are shared with general-purpose I/O; if JTAG remains fuse-enabled at reset, those four pins are unavailable as GPIO, a frequent cause of 'dead' I/O in production units. Program the JTAG-disable fuse when the debug interface is not needed. Also note that AVR Flash self-programming blocks instruction fetch on the same page - structure bootloader code so display updates (LCD RAM) continue during EEPROM/Flash writes to avoid visible display flicker during field firmware updates.
Informações de conformidade
Compliance certificates were not captured in the verified data for this exact ordering code. Obtain the official Microchip Material Declaration for ATMEGA329-16MU before specifying in regulated builds.
