ATMEGA329A-AUR - AVR 8-bit MCU 32KB Flash 20MHz | Microchip
MPN： ATMEGA329A-AUR ✓ 啟用中ATMEGA329A-AUR 概覽
An 8-bit microcontroller (MCU) is a self-contained computing IC that integrates a processor core, program memory, data memory, and peripherals such as timers, UARTs, and analog converters on a single chip. The ATmega family belongs to the AVR architecture line, positioned within the broader hierarchy of embedded microcontrollers used in consumer, industrial, and instrumentation systems.
Key features of the ATMEGA329A-AUR include the advanced AVR RISC core executing 131 powerful instructions, most in a single clock cycle, delivering up to 20 MIPS throughput at 20MHz. The integrated LCD controller is the defining peripheral of this device, supporting up to 132 segment drivers for driving liquid-crystal displays directly. A built-in 10-bit ADC, multiple timers, and dual USART serial interfaces round out the peripheral set.
Architecturally, the device uses a Harvard-architecture pipeline with separate program and data buses, allowing single-cycle instruction fetch and execution. The 32KB FLASH supports 10,000 program/erase cycles, the EEPROM supports 100,000 cycles, and in-system self-programming enables boot-loader-based field updates. The wide supply range of 1.8V to 5.5V accommodates both battery-operated and 5V industrial designs.
Typical applications include battery-powered instruments with LCD displays, utility metering, hand-held controllers, industrial panel interfaces, and medical monitoring devices where a low-power MCU drives segmented glass directly.
A key design consideration is clock-speed selection versus supply voltage: the full 20MHz rating applies at higher supply voltages, and designers should verify the frequency-voltage derating curve in the manufacturer datasheet before finalizing power architecture.
This page synthesizes distributor availability, drop-in same-family alternatives, pricing context, and practical design notes not consolidated in the manufacturer datasheet. Pricing shown as of 2026-09-17.
直接替換替代品，適用於 ATMEGA329A-AUR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ATMEGA329A-AUR （相同外形與佔位） — 差異在於 Package, LCD Controller, Core Architecture, Supply Voltage Range, EEPROM.
ATMEGA329-16AUR
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA329PA-AUR
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA325A-AUR
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA325PA-AUR
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA649A-AUR
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA329A-AUR 最大額定值與電氣特性
| Core Architecture | AVR 8-bit RISC |
| Flash Memory | 32KB (16K x 16) |
| SRAM | 2KB |
| EEPROM | 1KB |
| Maximum Clock Speed | 20MHz |
| Supply Voltage Range | 1.8V to 5.5V |
| I/O Ports | 32 I/O lines |
| LCD Controller | Integrated, up to 132 segments |
| ADC | 10-bit |
| 封裝 | 64-TQFP (14x14 mm) |
| Package Pitch | 0.8 mm |
| Package Height | 1 mm |
| 安裝類型 | Surface Mount |
| Programming Interface | ICSP (In-Circuit Serial Programming) |
| Life Cycle Stage | Active |
| Qualification | Industrial grade (Ind Grn) |
ATMEGA329A-AUR 1 mm 腳位配置指南
ATMEGA329A-AUR（1 mm 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： ATMEGA329A-AUR.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATMEGA329A-AUR 適用於 6 應用s: Utility Metering with LCD Display, Hand-Held Industrial Controllers, Medical Monitoring Devices, Building Access Panels and Security KeyPads, Smart Home and IoT Sensor Nodes, Instrumentation and Test Panel Displays.
Utility Metering with LCD Display
The ATMEGA329A-AUR fits utility metering products because its integrated LCD controller drives segmented glass directly with up to 132 segments, eliminating an external LCD driver IC and its associated wiring and BOM cost. The 32KB FLASH holds metering firmware, tariff tables, and display glyph data, while the 1KB EEPROM stores calibration constants and cumulative register values that must survive power loss. Operation down to 1.8V allows direct use of battery backup rails. The MCU updates the display and accumulates pulse inputs from sensing front ends using its timers, with the 10-bit ADC available for auxiliary analog supervision such as battery voltage monitoring.
推薦
Hand-Held Industrial Controllers
Hand-held controllers benefit from the ATMEGA329A-AUR's combination of a 20MHz AVR core, 32KB in-system programmable FLASH, and a built-in LCD driver, all within a single 64-TQFP package that keeps handheld PCBs compact. The wide 1.8V to 5.5V supply range tolerates battery sag, and the 32 I/O lines interface keypads, indicator LEDs, and limit switches. Dual USARTs, where used, link the handheld to barcode scanners or PC configuration tools. Because the device supports ICSP via the MPLAB SNAP through two I/O pins plus reset, field-service firmware updates can be performed without disassembling the enclosure, reducing total cost of ownership for fleets of deployed handhelds.
推薦
Medical Monitoring Devices
Portable medical monitoring instruments use the ATMEGA329A-AUR to drive a segmented LCD readout of measurements while the 10-bit ADC digitizes sensor front-end outputs. The 2KB SRAM buffers samples for peak detection and averaging, and the 1KB EEPROM retains patient-configuration and calibration data across power cycles. Low supply voltage operation down to 1.8V supports compact battery designs, and the AVR power-down mode minimizes standby drain between measurement intervals. The single-chip integration of the LCD controller reduces component count in devices subject to strict BOM documentation, simplifying design history files compared with two-chip MCU-plus-LCD-driver solutions commonly used in this space.
推薦
Building Access Panels and Security KeyPads
Access-control panels and coded keypads pair the ATMEGA329A-AUR's LCD controller with its 32 I/O lines: the display shows status menus and entry prompts while GPIO scans a matrix keypad. The 32KB FLASH accommodates credential databases and multi-language glyph sets, and the EEPROM stores enrolled codes that must persist through outages. Dual USARTs allow simultaneous RS-485 networking to a controller hub plus a local service port. The industrial-grade (Ind Grn) build supports extended deployment environments typical of door hardware, and in-system self-programming enables field firmware updates over the service UART without removing the MCU from the installed PCB.
推薦
Smart Home and IoT Sensor Nodes
Battery-powered smart home nodes use the ATMEGA329A-AUR where a small segmented LCD gives users local status feedback for thermostats, door sensors, or climate monitors. The MCU's idle and power-down sleep modes cut average current so a coin cell can power the node for extended periods, while wake-up sources (external interrupts, watchdog) resume sampling quickly from the 20MHz core. The 10-bit ADC reads temperature, humidity, or light sensors, and a USART bit-banged or hardware link passes data to a radio module. The integrated LCD driver removes an entire peripheral IC from the node BOM, important at consumer IoT cost targets.
推薦
Instrumentation and Test Panel Displays
Bench and field instrumentation uses the ATMEGA329A-AUR as the front-panel controller: the LCD controller renders measured values and setup menus, while the 20MHz core performs scaling, linearization, and button handling. The 32KB FLASH stores lookup tables for sensor linearization, and the ADC supervises supply rails and auxiliary analog channels. In-system programming permits instrument firmware revision updates on the production line and in calibration labs via the ICSP header wired to the panel PCB. Because the same 64-TQFP footprint spans the ATmega325/329/649 LCD family, instrument platforms can scale FLASH capacity (32KB to 64KB) without changing the PCB layout.
推薦
推薦產品摘要
工程參考資料，適用於 ATMEGA329A-AUR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ATMEGA329-16AUR | ATMEGA329PA-AUR | ATMEGA325A-AUR | ATMEGA649A-AUR |
|---|---|---|---|---|---|
| Package | 64-TQFP (14x14 mm) | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Speed | 20MHz | 16MHz | 20MHz | 20MHz | 20MHz |
| Flash Memory | 32KB | 32KB | 32KB | 32KB | 64KB |
| Supply Voltage | 1.8V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V |
| LCD Controller | Yes (up to 132 segments) | Yes (up to 132 segments) | Yes (up to 132 segments) | Yes (up to 132 segments) | Yes (up to 132 segments) |
| Low-Power Technology | Standard | Standard | picoPower (lower sleep current) | Standard | Standard |
| Primary Trade-off | Fastest speed in family | Lower cost, 20% slower | Best battery life, possibly higher price | Reduced peripheral set | More memory, higher cost |
主要差異化特點
- 20MHz operation, 25% faster than the 16MHz variant (對比ATMEGA329-16AUR)
- Dual USART peripheral set (對比ATMEGA325A-AUR)
- Cost-optimal 32KB FLASH (對比ATMEGA649A-AUR)
設計說明
The 20MHz maximum clock applies only at the upper end of the 1.8V to 5.5V supply range. Estimated: before finalizing the power tree, plot your worst-case battery voltage against the datasheet speed-versus-voltage derating curve; if your design must run 20MHz near end-of-discharge battery voltage, either raise the minimum rail with a boost converter or derate the system clock. Reserve margin on the 1.8V floor since brown-out detection thresholds should be set above the minimum operating voltage for reliable reset.
Use the 64-TQFP (0.8mm pitch) land pattern per IPC-compliant footprint calculators and keep the 14x14mm outline free of tall components near the perimeter if a display or bezel overlays the MCU. Decouple VCC/AVCC with 100nF ceramics placed within a few millimeters of each pin pair, and tie a solid ground plane under the package. Because the LCD controller drives many segment lines across PORTA-adjacent pins, route LCD backplane traces away from the crystal and analog sense lines to minimize crosstalk flicker.
Do not forget to reserve the SPI pins and RESET for the ICSP header: per Microchip, the MPLAB SNAP uses two device I/O pins plus the reset line for in-circuit debugging and programming, and panels that preclude header access complicate field updates. Also, when substituting from ATMEGA329A to the picoPower ATMEGA329PA, re-check BOD and sleep-mode register settings, as picoPower sleep behavior differs and can change measured standby current significantly.
合規資訊
Distributor listings describe the part as Ind Grn (industrial, green), suggesting lead-free/halogen-reduced packaging, but formal RoHS/REACH status must be confirmed from the Microchip product page certificate documents.