ATMEGA329-16MU - 8-Bit AVR MCU 16MHz 32KB LCD | Microchip
料号： ATMEGA329-16MU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 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 概述
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.
直接替换替代料： ATMEGA329-16MU ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATMEGA329-16MU （相同外形与封装尺寸） ——差异在于 Package, Instructions, ADC, Number of I/O, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
ATMEGA329P-16MU
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATMEGA3290-16MU
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATMEGA325-16MUR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$3.28 / 个
查看数据手册 →ATMEGA325PV-10MU
✅ 直接替换✓ 有现货
$2.19 / 个
查看数据手册 →ATMEGA325PA-MUR
✅ 直接替换✓ 有现货
$1.65 / 个
查看数据手册 →ATMEGA329-16MU 最大额定值与电气特性
| 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 |
| 电源电压 | 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 |
| 封装 | 64-QFN (MLF), 9 x 9 mm |
| 安装类型 | Surface Mount |
| Lifecycle Stage | ACTIVE |
ATMEGA329-16MU 64-qfn (mlf), 9 x 9 mm 引脚配置指南
ATMEGA329-16MU（64-qfn (mlf), 9 x 9 mm 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： ATMEGA329-16MU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATMEGA329-16MU 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： ATMEGA329-16MU ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Integrated LCD controller on-chip （对比 ATMEGA328P-MU)
- JTAG boundary-scan and on-chip debug （对比 ATMEGA328P-MU)
- Trade-off: standard (non-picoPower) power architecture （对比 ATMEGA329P-16MU)
- 16 MHz / 5 V speed grade for industrial 5 V rails （对比 ATMEGA325PV-10MU)
设计说明
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.
合规信息
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.
