ATMEGA329P-20MUR - 8-bit AVR MCU, 32KB Flash, 20MHz, 64-QFN | Microchip
料号： ATMEGA329P-20MUR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.58 | $75.80 |
| 100 | $6.74 | $674.00 |
| 500 | $6.05 | $3,025.00 |
| 1,000 | $5.4 | $5,400.00 |
ATMEGA329P-20MUR 概述
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory (Flash), working memory (SRAM), non-volatile data storage (EEPROM), and integrated peripherals such as timers, communication interfaces, and analog blocks. The AVR architecture used by the ATmega family is a Modified Harvard RISC design with single-cycle instruction execution, which simplifies deterministic timing for embedded control. AVR microcontrollers are widely used in industrial control, consumer electronics, automotive subsystems, IoT endpoints, and educational platforms because of their low power, predictable interrupt response, and rich toolchain support (GCC, Atmel Studio / Microchip Studio).
Key features of the ATMEGA329P-20MUR include its 20 MHz maximum CPU clock at 5V operation, picoPower technology for low-power applications, an LCD controller that directly drives segmented displays, JTAG debug support, and a 10-bit successive-approximation ADC. The device supports multiple sleep modes for battery-powered designs and operates over an industrial temperature range of -40C to +85C.
The ATmega329P uses a two-stage pipelined Harvard architecture with 32 general-purpose registers directly tied to the ALU, enabling single-cycle ALU operations. The 32 KB flash supports in-system programming (ISP) and read-while-write, which lets the firmware update one section while executing from another - a useful feature for bootloader designs and field-upgradable products.
Typical applications include industrial control panels with LCD readouts, home appliances with segmented display interfaces, white goods control boards, instrumentation, sensor hubs, and battery-powered metering. The integrated LCD controller and abundant GPIO make it well-suited for human-machine interface (HMI) applications where a numeric or alphanumeric LCD is needed without an external display driver IC.
When designing with this device, ensure that the 64-QFN exposed pad is soldered to a sufficient ground plane for thermal and electrical performance, and that decoupling capacitors (100 nF plus bulk) are placed close to the AVCC and VCC pins. The LCD segment pins share package balls with GPIO, so pin multiplexing must be considered early in PCB layout.
This page synthesizes distributor pricing, drop-in alternatives within the ATmega AVR family, application guidance, and practical design notes not found in a single manufacturer document.
直接替换替代料： ATMEGA329P-20MUR ——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： ATMEGA329P-20MUR （相同外形与封装尺寸） ——差异在于 Package, RoHS Status, ADC, LCD Controller, Supply Voltage (Vcc).
快速对比工具——选择替代料号进行并排对比：
ATMEGA329A-MUR
✅ 直接替换✓ 有现货
$3.61 / 个
查看数据手册 →ATMEGA329P-20MU
✅ 直接替换✓ 有现货
$4.78 / 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 →ATMEGA325P-20MUR
✅ 直接替换✓ 有现货
$2.86 / 个
查看数据手册 →ATMEGA3290P-20AUR
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →ATMEGA329P-20MUR 最大额定值与电气特性
| Core Architecture | 8-bit AVR RISC |
| Program Memory (Flash) | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Maximum CPU Frequency | 20 MHz |
| Supply Voltage (Vcc) | 1.8 V to 5.5 V (5V operation at 20 MHz) |
| General-Purpose I/O | 54 |
| General-Purpose Registers | 32 |
| ADC | 10-bit successive approximation |
| 封装 | 64-QFN (9x9 mm) |
| 工作温度 | -40C to +85C (Industrial) |
| 安装类型 | Surface Mount |
| LCD Controller | Yes (integrated) |
| JTAG Interface | Yes |
| picoPower Technology | Yes |
| RoHS 状态 | Compliant (Green) |
ATMEGA329P-20MUR 引脚配置
| 引脚 1 | VCC — Digital supply voltage |
| 引脚 2 | GND — Ground |
| 引脚 3 | AVCC — Analog supply voltage |
| 引脚 4 | AREF — ADC reference voltage |
| 引脚 5 | PA0 — GPIO / ADC0 |
| 引脚 6 | PA1 — GPIO / ADC1 |
| 引脚 7 | PA2 — GPIO / ADC2 |
| 引脚 8 | PA3 — GPIO / ADC3 |
| 引脚 9 | PA4 — GPIO / ADC4 |
| 引脚 10 | PA5 — GPIO / ADC5 |
| 引脚 11 | PA6 — GPIO / ADC6 |
| 引脚 12 | PA7 — GPIO / ADC7 |
| 引脚 13 | PB0 — GPIO / SEG0 |
| 引脚 14 | PB1 — GPIO / SEG1 |
| 引脚 15 | PB2 — GPIO / OC1B / SEG2 |
| 引脚 16 | PB3 — GPIO / OC1A / SEG3 |
| 引脚 17 | PB4 — GPIO / SS / SEG4 |
| 引脚 18 | PB5 — GPIO / SEG5 |
| 引脚 19 | PB6 — GPIO / SEG6 |
| 引脚 20 | PB7 — GPIO / SEG7 |
| 引脚 21 | PC0 — GPIO / SEG8 |
| 引脚 22 | PC1 — GPIO / SEG9 |
| 引脚 23 | PC2 — GPIO / SEG10 |
| 引脚 24 | PC3 — GPIO / SEG11 |
| 引脚 25 | PC4 — GPIO / SEG12 |
| 引脚 26 | PC5 — GPIO / SEG13 |
| 引脚 27 | PC6 — GPIO / SEG14 |
| 引脚 28 | PC7 — GPIO / SEG15 |
| 引脚 29 | RESET — Reset input (active low) |
| 引脚 30 | VCC — Digital supply voltage |
| 引脚 31 | GND — Ground |
| 引脚 32 | XTAL2 — Crystal oscillator output |
| 引脚 33 | XTAL1 — Crystal oscillator input |
| 引脚 34 | PD0 — GPIO / RXD |
| 引脚 35 | PD1 — GPIO / TXD |
| 引脚 36 | PD2 — GPIO / INT0 |
| 引脚 37 | PD3 — GPIO / INT1 |
| 引脚 38 | PD4 — GPIO / OC1B |
| 引脚 39 | PD5 — GPIO / OC1A |
| 引脚 40 | PD6 — GPIO / ICP1 |
| 引脚 41 | PD7 — GPIO / OC2 |
| 引脚 42 | PE0 — GPIO / COM0 / PDI |
| 引脚 43 | PE1 — GPIO / COM1 / PDO |
| 引脚 44 | PE2 — GPIO / COM2 |
| 引脚 45 | PE3 — GPIO / COM3 |
| 引脚 46 | PE4 — GPIO / COM4 |
| 引脚 47 | PE5 — GPIO / COM5 |
| 引脚 48 | PE6 — GPIO / COM6 |
| 引脚 49 | PE7 — GPIO / COM7 |
| 引脚 50 | PF0 — GPIO / SEG16 |
| 引脚 51 | PF1 — GPIO / SEG17 |
| 引脚 52 | PF2 — GPIO / SEG18 |
| 引脚 53 | PF3 — GPIO / SEG19 |
| 引脚 54 | PF4 — GPIO / SEG20 |
| 引脚 55 | PF5 — GPIO / SEG21 |
| 引脚 56 | PF6 — GPIO / SEG22 |
| 引脚 57 | PF7 — GPIO / SEG23 |
| 引脚 58 | PG0 — GPIO / SEG24 |
| 引脚 59 | PG1 — GPIO / SEG25 |
| 引脚 60 | PG2 — GPIO / SEG26 |
| 引脚 61 | PG3 — GPIO / SEG27 |
| 引脚 62 | PG4 — GPIO / SEG28 |
| 引脚 63 | TDI — JTAG Test Data In |
| 引脚 64 | EP — Exposed pad (connect to GND) |
典型应用
ATMEGA329P-20MUR 适用于 6 应用s: Industrial Control Panels with LCD, Home Appliance Control Boards, Battery-Powered Metering Devices, Human-Machine Interface (HMI) Modules, Sensor Hubs and Data Loggers, Educational and Prototyping Platforms.
Industrial Control Panels with LCD
The ATMEGA329P-20MUR fits industrial control panel designs because its integrated segmented LCD controller eliminates an external display driver, reducing BOM and PCB area. With 54 GPIO pins, the device can drive keypads, LEDs, relays, and sensors concurrently while the LCD peripheral handles real-time numeric readouts. The 20 MHz core and 32 KB flash comfortably run control loops with PID algorithms and HMI menu logic, and the 64-QFN 9x9 mm footprint fits within the typical 80 x 80 mm panel outline.
推荐
Home Appliance Control Boards
White goods such as washing machines, dishwashers, ovens, and microwaves benefit from the ATMEGA329P-20MUR's combination of segmented LCD, abundant GPIO, and picoPower efficiency. The integrated LCD controller directly drives 7-segment or icon displays for time, temperature, and status readouts. Its 1.8 V to 5.5 V supply range simplifies designs that share a single 5 V or 3.3 V rail, and the industrial temperature grade supports unheated appliance enclosures without derating.
推荐
Battery-Powered Metering Devices
The picoPower technology in the ATMEGA329P-20MUR makes it well-suited for battery-powered metering such as gas, water, or electricity meters that must run for years on a primary cell. The 32 KB flash stores calibration tables and accumulated usage data in EEPROM, while the LCD peripheral provides local readouts without external drivers. The multiple low-power sleep modes (idle, power-save, standby) combined with the 1.8 V minimum supply allow designs that operate from a single 3 V lithium coin cell.
推荐
Human-Machine Interface (HMI) Modules
HMI subsystems in industrial automation, building controls, and instrumentation benefit from the ATMEGA329P-20MUR's LCD controller plus 54 GPIO, which can simultaneously drive a segmented LCD, multiple pushbuttons, encoder inputs, and indicator LEDs. The 32 KB flash supports menu structures, multilingual strings, and graphical state machines. With JTAG debug support, firmware engineers can develop and validate HMI logic on the same chip used in production, reducing toolchain complexity.
推荐
Sensor Hubs and Data Loggers
The ATMEGA329P-20MUR can serve as a sensor hub or data logger for environmental, agricultural, or industrial monitoring. The 10-bit ADC interfaces with analog sensors (temperature, humidity, pressure transducers), and the 2 KB SRAM plus 1 KB EEPROM provide buffering for time-stamped readings. The 32 KB flash supports FAT-style logging tables or compressed sample storage. JTAG and ISP simplify field firmware updates over the same SPI pins used for external sensors.
推荐
Educational and Prototyping Platforms
The ATMEGA329P-20MUR's AVR architecture, generous GPIO, and JTAG debug interface make it suitable for university embedded courses and engineering prototypes. The 32 KB flash accommodates student projects that mix LCD output, ADC sampling, and serial communication. The same MCU is supported by open-source toolchains (avr-gcc, avrdude, Microchip Studio), so learners can transition from Arduino-style boards to bare-metal QFN designs without changing core.
推荐
推荐产品汇总
工程参考数据： ATMEGA329P-20MUR ——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 | ATMEGA329A-MUR | ATMEGA329P-20MU | ATMEGA325PA-MUR | ATMEGA325P-20MUR | ATMEGA3290P-20AUR |
|---|---|---|---|---|---|---|
| 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 | 64-QFN (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| Maximum CPU Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Integrated LCD Controller | Yes (segmented) | Yes (segmented) | Yes (segmented) | Yes (segmented) | Yes (segmented) | Yes (TFT / color) |
| picoPower Low-Power Modes | Yes | No | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
关键差异点
- Integrated segmented LCD controller eliminates external driver IC （对比 ATMEGA325P-20MUR)
- picoPower technology for battery-friendly sleep currents （对比 ATMEGA329A-MUR)
- Higher 20 MHz CPU clock at full 5V operation （对比 ATMEGA325PV-10MU)
设计说明
Estimated: The ATMEGA329P-20MUR in the 64-QFN package has a typical theta_JA of approximately 30 C/W on a 4-layer JEDEC test board. At 20 MHz active mode drawing ~15 mA at 5V, dissipation is ~75 mW, yielding a junction rise of ~2.3C above ambient - well within the -40C to +85C industrial range. The exposed pad (EP) MUST be soldered to a continuous ground copper pour with thermal vias for production reliability.
Place a 100 nF decoupling capacitor as close as possible to each VCC and AVCC pin, plus a single 10 uF bulk capacitor near the package. The exposed pad requires a continuous copper plane with at least 4 thermal vias to the inner ground plane for heat sinking and electrical grounding. Route the analog AVCC trace away from digital switching signals to minimize ADC noise coupling.
The LCD segment pins (PB0-PB7, PC0-PC7, PF0-PF7, PG0-PG4) share package balls with GPIO functions, so the pin multiplexing must be configured before firmware brings up segments. Plan PCB layout to keep the LCD glass connector short and well away from switching power or digital clock traces. JTAG pins (TDI, TDO, TMS, TCK) should be accessible for in-circuit debugging on prototype boards.
Do not assume 20 MHz operation at voltages below 4.5 V - consult the speed-grade tables in the datasheet. The ISP programming pins (MOSI, MISO, SCK, RESET) must not be externally pulled low or driven by external circuitry during programming. For battery designs, use the picoBrown power-save mode (not idle mode) to achieve single-digit uA current.
Keep crystal traces short (under 5 mm) and surrounded by a ground guard ring for noise immunity. The ADC reference voltage (AREF) requires a low-impedance source; place a 100 nF + 10 nF capacitor pair on AREF. When using JTAG in noisy environments, add 10 kohm pull-ups on TMS and TDI to prevent spurious boundary-scan entry.
合规信息
Green-compliant per Microchip product page (RoHS and lead-free). Not AEC-Q100 qualified - select ATmega automotive variants for vehicle applications. Industrial temperature range -40C to +85C.