ATMEGA329P-20MU - 8-bit AVR MCU, 32KB Flash, 20MHz | Microchip
料号： ATMEGA329P-20MU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $7.85 | $7.85 |
| 10 | $7.05 | $70.50 |
| 100 | $6.15 | $615.00 |
| 500 | $5.42 | $2,710.00 |
| 1,000 | $4.78 | $4,780.00 |
ATMEGA329P-20MU 概述
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data memory, I/O peripherals, and timers onto one die, executing instructions fetched from on-chip Flash. Within the broader taxonomy, the ATMEGA329P belongs to the AVR family of RISC microcontrollers, itself a subset of the picoPower low-power MCU category, which sits under the embedded computing / power-managed semiconductor hierarchy. The AVR core uses a Harvard-style architecture with separate program and data buses and a large register file of 32 general-purpose working registers directly tied to the ALU, enabling most instructions to complete in a single clock cycle.
Key features that differentiate the ATMEGA329P-20MU include 131 powerful instructions (most single-cycle execution), a hardware multiplier, two 8-bit timer/counters plus two 16-bit timer/counters with PWM, 8-channel 10-bit ADC, a USART, SPI and TWI (I2C-compatible) peripherals, an integrated LCD controller capable of driving segment displays up to 4 common and 32 segment lines, and a 4-channel PWM with programmable dead-time generators. Six sleep modes (Idle, Power-down, Power-save, Standby, Extended Standby, and ADC Noise Reduction) plus the picoPower 0.1uA real-time-clock operation make it attractive for battery-backed applications.
Architecturally, the ATMEGA329P-20MU adds the 'P' picoPower enhancements on top of the legacy ATmega329 die, lowering active current and supporting ultra-low-power RTC backup. The QFN-64 (MLF) package with exposed pad gives a low theta-JA for thermal dissipation and a small PCB footprint. It is pin-compatible with the ATmega169/329 family and shares the same peripheral mix for migration paths.
Typical applications include industrial control panels with integrated LCD segment displays, battery-powered metering and instrumentation, white-goods HMI, e-bike dashboards, medical handheld terminals, and remote sensor readout heads. The combination of LCD controller and picoPower sleep modes suits mains-line or battery-driven user-interface products. For designs requiring graphical TFT instead of segment LCD, consider the ATmega3290P or an external display controller.
When designing with this part, observe that '20MU' denotes the 20MHz speed grade at 5V operation; at lower Vcc the maximum clock must be derated per the datasheet DC characteristics. Place decoupling capacitors as close as possible to each VCC/GND pair and ensure the exposed pad is soldered to a sufficient ground copper pour for both thermal and electrical performance.
This page synthesizes distributor pricing as of 2026-09-17, drop-in same-package alternatives drawn from the same ATmega329/325 QFN-64 family, and practical design notes not aggregated on any single distributor product page.
直接替换替代料： ATMEGA329P-20MU ——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-20MU （相同外形与封装尺寸） ——差异在于 Package, ADC, RoHS Status, Core Architecture, Supply Voltage (Vcc).
快速对比工具——选择替代料号进行并排对比：
ATMEGA325P-20MU
✅ 直接替换✓ 有现货
$2.21 / 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 →ATMEGA329P-20AU
✅ 直接替换✓ 有现货
$4.71 / 个
查看数据手册 →ATMEGA329P-20MUR
✅ 直接替换✓ 有现货
$5.4 / 个
查看数据手册 →ATMEGA329P-20MU 最大额定值与电气特性
| Core | 8-bit AVR RISC |
| Flash Program Memory | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Maximum CPU Clock | 20 MHz |
| Supply Voltage (Vcc) | 2.7 V to 5.5 V |
| General-Purpose I/O Pins | 54 |
| 封装 | 64-QFN / MLF (9 x 9 mm) with exposed pad |
| 安装类型 | Surface Mount |
| ADC | 8-channel, 10-bit |
| Timer/Counters | Two 8-bit + Two 16-bit with PWM |
| PWM Channels | 6 channels |
| Communication Interfaces | USART, SPI, TWI (I2C-compatible) |
| LCD Controller | Up to 4x32 segment driver (integrated) |
| On-chip Debug | JTAG |
| 工作温度范围 | -40C to +85C (Industrial) |
| Instruction Set | 131 instructions, mostly single-cycle |
| Working Registers | 32 x 8-bit |
| Watchdog Timer | Yes, programmable |
| Brown-out Detector | Yes |
| Sleep Modes | 6 (Idle, Power-down, Power-save, Standby, Ext Standby, ADC Noise Reduction) |
| MSL 等级 | 3 (168 hours) |
| RoHS 状态 | Compliant (Green) |
ATMEGA329P-20MU 引脚配置
| 引脚 1 | VCC — Digital supply voltage |
| 引脚 2 | GND — Ground |
| 引脚 3 | PORTA0 — Port A bit 0 (digital I/O / ADC0) |
| 引脚 4 | PORTA1 — Port A bit 1 (digital I/O / ADC1) |
| 引脚 5 | PORTA2 — Port A bit 2 (digital I/O / ADC2) |
| 引脚 6 | PORTA3 — Port A bit 3 (digital I/O / ADC3) |
| 引脚 7 | PORTA4 — Port A bit 4 (digital I/O / ADC4) |
| 引脚 8 | PORTA5 — Port A bit 5 (digital I/O / ADC5) |
| 引脚 9 | PORTA6 — Port A bit 6 (digital I/O / ADC6) |
| 引脚 10 | PORTA7 — Port A bit 7 (digital I/O / ADC7) |
| 引脚 11 | AVCC — Analog supply voltage |
| 引脚 12 | AREF — Analog reference voltage |
| 引脚 13 | GND — Ground (analog) |
| 引脚 14 | PORTB0 — Port B bit 0 (digital I/O) |
| 引脚 15 | PORTB1 — Port B bit 1 (digital I/O) |
| 引脚 16 | PORTB2 — Port B bit 2 (SS/OC1B) |
| 引脚 17 | PORTB3 — Port B bit 3 (MOSI/OC1A) |
| 引脚 18 | PORTB4 — Port B bit 4 (MISO) |
| 引脚 19 | PORTB5 — Port B bit 5 (SCK) |
| 引脚 20 | PORTB6 — Port B bit 6 (OC2B/PCINT6) |
| 引脚 21 | PORTB7 — Port B bit 7 (OC2A/PCINT7) |
| 引脚 22 | PORTC0 — Port C bit 0 (LCD SEG0) |
| 引脚 23 | PORTC1 — Port C bit 1 (LCD SEG1) |
| 引脚 24 | PORTC2 — Port C bit 2 (LCD SEG2) |
| 引脚 25 | PORTC3 — Port C bit 3 (LCD SEG3) |
| 引脚 26 | PORTC4 — Port C bit 4 (LCD SEG4) |
| 引脚 27 | PORTC5 — Port C bit 5 (LCD SEG5) |
| 引脚 28 | PORTC6 — Port C bit 6 (LCD SEG6) |
| 引脚 29 | PORTC7 — Port C bit 7 (LCD SEG7) |
| 引脚 30 | RESET — Reset input (active low) |
| 引脚 31 | VCC — Digital supply voltage |
| 引脚 32 | GND — Ground |
| 引脚 33 | XTAL2 — Crystal oscillator output |
| 引脚 34 | XTAL1 — Crystal oscillator input |
| 引脚 35 | PORTD0 — Port D bit 0 (RXD/INT0) |
| 引脚 36 | PORTD1 — Port D bit 1 (TXD/INT1) |
| 引脚 37 | PORTD2 — Port D bit 2 (INT2) |
| 引脚 38 | PORTD3 — Port D bit 3 (INT3) |
| 引脚 39 | PORTD4 — Port D bit 4 (OC1B) |
| 引脚 40 | PORTD5 — Port D bit 5 (OC1A) |
| 引脚 41 | PORTD6 — Port D bit 6 (OC2B/ICP) |
| 引脚 42 | PORTD7 — Port D bit 7 (OC2A) |
| 引脚 43 | PORTE0 — Port E bit 0 (RXD0/PCINT8) |
| 引脚 44 | PORTE1 — Port E bit 1 (TXD0) |
| 引脚 45 | PORTE2 — Port E bit 2 (XCK0/AIN0) |
| 引脚 46 | PORTE3 — Port E bit 3 (OC3A/AIN1) |
| 引脚 47 | PORTE4 — Port E bit 4 (OC3B/INT4) |
| 引脚 48 | PORTE5 — Port E bit 5 (OC3C/INT5) |
| 引脚 49 | PORTE6 — Port E bit 6 (TOSC1) |
| 引脚 50 | PORTE7 — Port E bit 7 (TOSC2) |
| 引脚 51 | PORTF0 — Port F bit 0 (ADC0/TDI) |
| 引脚 52 | PORTF1 — Port F bit 1 (ADC1/TDO) |
| 引脚 53 | PORTF2 — Port F bit 2 (ADC2/TMS) |
| 引脚 54 | PORTF3 — Port F bit 3 (ADC3/TCK) |
| 引脚 55 | PORTF4 — Port F bit 4 (ADC4) |
| 引脚 56 | PORTF5 — Port F bit 5 (ADC5) |
| 引脚 57 | PORTF6 — Port F bit 6 (ADC6) |
| 引脚 58 | PORTF7 — Port F bit 7 (ADC7) |
| 引脚 59 | PORTG0 — Port G bit 0 (WR) |
| 引脚 60 | PORTG1 — Port G bit 1 (RD) |
| 引脚 61 | PORTG2 — Port G bit 2 (ALE) |
| 引脚 62 | PORTG3 — Port G bit 3 |
| 引脚 63 | PORTG4 — Port G bit 4 (TOSC1 alt) |
| 引脚 64 | PORTG5 — Port G bit 5 (OC0B) |
典型应用
ATMEGA329P-20MU 适用于 6 应用s: Industrial Metering & Sub-metering with Segment LCD, Battery-Powered Sensor / Data Logger Heads, White Goods / Appliance HMI Panels, E-Bike / Scooter Dashboard & Battery Display, Medical Handheld / Point-of-Care Devices, Industrial Control Panels with Segment Display.
Industrial Metering & Sub-metering with Segment LCD
The ATMEGA329P-20MU's integrated 4x32 segment LCD controller eliminates the need for an external driver IC in electricity, water, gas, or heat meters. Its 32KB Flash holds metering firmware plus IEC 62056-21 / DLMS protocol stacks, and 2KB SRAM handles measurement buffers. The picoPower active current (~1mA per MHz at 3.3V) plus 0.1uA RTC backup enables battery-augmented designs for retrofit meters. Place the QFN-64 exposed pad over a generous ground copper pour for thermal stability during 24/7 operation.
推荐
Battery-Powered Sensor / Data Logger Heads
With six software-selectable sleep modes drawing as little as 0.1uA in Power-save with RTC running, the ATMEGA329P-20MU is ideal for remote sensor heads that wake periodically, sample, log to EEPROM, and return to sleep. The 8-channel 10-bit ADC reads sensor voltages directly; the on-chip bandgap reference simplifies ratiometric measurements. Battery life of multiple years is achievable when duty-cycling the ADC and USART. The QFN-64 9x9mm footprint suits small enclosures.
推荐
White Goods / Appliance HMI Panels
Washing machines, ovens, dishwashers, and microwaves use the ATMEGA329P-20MU to drive a 4-digit segment display, read capacitive or resistive touch buttons, control relays via GPIO, and communicate with the main appliance controller over UART. The 20MHz clock handles real-time UI updates without perceptible lag, while the integrated LCD driver reduces BOM cost compared to designs using an external HT1621. Industrial -40 to +85C operation handles under-counter or garage environments.
推荐
E-Bike / Scooter Dashboard & Battery Display
The ATMEGA329P-20MU drives a segment-LCD speed, battery, and trip display, reads wheel-reed pulses and throttle position via ADC, and updates the user in real time. Its 2.7V minimum operating voltage is well-suited for 1S Li-ion packs with onboard 3.3V regulators. Six PWM channels drive indicator LEDs or control a buzzer. JTAG debug enables rapid firmware iteration during product development.
推荐
Medical Handheld / Point-of-Care Devices
Handheld glucose meters, INR readers, and pulse-oximeter displays benefit from the ATMEGA329P-20MU's combination of segment-LCD controller, picoPower sleep, and industrial temperature range. The 32KB Flash holds the measurement algorithm plus a full alphanumeric UI state machine. 1KB EEPROM retains calibration constants across battery swaps. SPI/TWI interfaces connect to external ADC, EEPROM, or Bluetooth modules. QFN-64 keeps the PCB small enough to fit a pen-style housing.
推荐
Industrial Control Panels with Segment Display
Control panels for HVAC, pumps, motor starters, and building automation use the ATMEGA329P-20MU to display operating state on a segment LCD, scan keypads, drive relays or triacs via GPIO and PWM, and report telemetry over RS-485 / Modbus via the on-chip USART. The 20MHz core handles background polling of inputs while servicing the LCD controller via DMA-free polled updates. Wide 2.7V to 5.5V supply range simplifies designs that tap 3.3V or 5V rails.
推荐
推荐产品汇总
工程参考数据： ATMEGA329P-20MU ——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 | ATMEGA325P-20MU | ATMEGA325PA-MU | ATMEGA329P-20AU | ATMEGA329P-20MUR |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (MLF) 9x9mm | 64-QFN (MLF) 9x9mm - same | 64-QFN (MLF) 9x9mm - same | 64-TQFP 14x14mm - different footprint | 64-QFN (MLF) 9x9mm - same |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Integrated LCD Controller | Yes (4x32 segments) | No | No | Yes (4x32 segments) | Yes (4x32 segments) |
| picoPower Low-Power Features | Yes | No | Yes | Yes | Yes |
| Operating Voltage | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
关键差异点
- Integrated 4x32 segment LCD controller with no external driver IC required （对比 ATMEGA325P-20MU)
- picoPower low-power architecture with 6 sleep modes and 0.1uA RTC backup （对比 ATMEGA325P-20MU)
- QFN-64 9x9mm package footprint for compact, thermally-efficient layouts （对比 ATMEGA329P-20AU (TQFP-64))
- On-chip JTAG debug and boundary-scan for production test （对比 ATMEGA328P-MU (32-pin QFN))
设计说明
Place a 100nF decoupling capacitor as close as possible to each VCC pin pair (pins 1 and 31), plus a 10uF bulk capacitor on the AVCC pin (pin 11). The QFN-64 exposed thermal pad MUST be soldered to a continuous ground copper pour with at least 8 thermal vias to the inner ground plane for both thermal dissipation and electrical grounding. Failing to solder the EP will result in excessive junction temperature and erratic analog ADC readings.
The '20' speed grade guarantees 20MHz operation only at 4.5V to 5.5V Vcc. Below 4.5V, the maximum clock frequency must be derated per the speed-grade tables in section 29 of the datasheet - for example at 2.7V the maximum is 10MHz. To use a low-tick 32.768kHz crystal on the TOSC1/TOSC2 pins (PE6/PE7) for RTC operation, configure the asynchronous timer correctly and select the appropriate fuse bits. Power-save mode with Timer2 running asynchronously can achieve 0.1uA typical RTC backup current.
Do not assume all 54 I/O pins are 5V-tolerant at 3.3V operation - any pin configured as an input has high-impedance and may need a pull-up. The JTAG pins (PF0-PF3) are multiplexed with the JTAG controller; disable JTAG via fuses if those pins are needed as standard GPIO in production. The LCD controller's segment pins (PC0-PC7 and PORTG) drive the glass directly - check segment load current limits in the datasheet LCD electrical characteristics when designing the display interface.
合规信息
RoHS and Green compliant per Microchip product page (formerly Atmel). Not AEC-Q100 qualified - for automotive applications consult Microchip automotive-grade ATmega equivalents. Halogen-free and lead-free per ordering information.
