ATMEGA328P-MMH - 20MHz 32KB 8-Bit AVR MCU | Microchip Technology
부품 번호: ATMEGA328P-MMH ✓ 활성ATMEGA328P-MMH 개요
An 8-bit microcontroller is a compact embedded-processing IC that executes instructions from nonvolatile program memory and uses general-purpose I/O to control sensors, communications links, indicators, and actuators. Within the product hierarchy, the ATMEGA328P is an AVR microcontroller, an 8-bit RISC MCU, a semiconductor, and a member of the broader embedded-processing category. Its combination of Flash, SRAM, EEPROM, and integrated serial interfaces supports standalone control without requiring external program or data memory.
Three headline capabilities define the ATMEGA328P-MMH: a 20 MHz maximum clock, 32 KB of Flash program storage, and 2 KB of SRAM. The manufacturer lists 32 KB of ISP Flash with read-while-write capability, 1 KB of EEPROM, 23 general-purpose I/O lines, and 32 general-purpose working registers. The device also provides 131 powerful instructions with most instructions executing in a single clock cycle, supporting efficient event-driven and control-oriented firmware.
The ATMEGA architecture integrates serial communication capabilities directly into the microcontroller. The verified distributor and comparison results identify I2C, SPI, and UART/USART interfaces, allowing the device to connect with sensors, external nonvolatile memory, transceivers, and host systems. Because ATMEGA328P-MMH is a surface-mount VQFN device, its 28-pin land pattern is intended for automated assembly and compact embedded boards rather than breadboard prototyping.
Typical uses include Arduino-compatible embedded controllers, compact sensor nodes, LED and display controllers, USB-to-serial data acquisition systems, industrial control modules, and educational prototyping platforms. The ATMEGA328P family is particularly useful when moderate processing performance, deterministic I/O, and integrated serial interfaces matter more than a high-pin-count processor or external memory bus.
Designers should verify the exact oscillator, reset, and power circuitry against the manufacturer documentation before layout. Because no numerical pinout was included in the supplied verified records, this page does not invent pin names or numbering. The 28-VQFN footprint also requires careful exposed-pad, paste, stencil, and reflow design, while the 4 x 4 mm package can make assembly inspection and rework more demanding than a leaded package.
This page combines verified manufacturer specifications, distributor availability information, same-package alternatives, and practical implementation guidance. It distinguishes published ATMEGA328P-MMH facts from unresolved values and highlights the memory, package, and firmware implications engineers should verify before selecting a replacement or releasing a PCB design.
드롭인 대체품: ATMEGA328P-MMH — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: ATMEGA328P-MMH (동일 폼 팩터 및 풋프린트) — 차이점: Package, Communication Interfaces, Timers, EEPROM, Flash Memory.
ATMEGA328-MMH
✅ 드롭인가격 문의
데이터시트 보기 →ATMEGA168PA-MMH
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ATMEGA48PA-MMHR
✅ 드롭인가격 문의
데이터시트 보기 →ATMEGA88A-MMH
✅ 드롭인 ⚠️ 사양 미검증가격 문의
데이터시트 보기 →ATMEGA168A-MMHR
✅ 드롭인 ⚠️ 사양 미검증가격 문의
데이터시트 보기 →ATMEGA328P-MMH 최대 정격 & 전기적 특성
| Product Type | 8-bit AVR RISC microcontroller |
| 최대 클록 주파수 | 20 MHz |
| Flash Memory | 32 KB |
| Flash Organization | 16K x 16 bits |
| ISP Flash Read-While-Write | Supported |
| SRAM | 2 KB |
| EEPROM | 1024 bytes |
| General-Purpose I/O Lines | 23 lines |
| General-Purpose Working Registers | 32 registers |
| Instruction Set | 131 powerful AVR instructions |
| Single-Clock-Cycle Execution | Most instructions |
| Serial Interfaces | I2C, SPI, and UART/USART |
| 패키지 | 28-VQFN, 4 x 4 mm |
| Package Pin Count | 28 pins |
| 실장 유형 | Surface mount |
| 동작 공급 전압 | 4.5 V to 5.5 V |
| Terminal Finish | NiPdAu |
| Green Compliance | Green |
ATMEGA328P-MMH 28 pins 핀 구성 가이드
ATMEGA328P-MMH(28 pins 패키지)의 핀 구성입니다. 이 디지털 IC에는 GPIO, 통신 인터페이스(UART, SPI, I2C), 전원 핀이 포함되어 있습니다. 대체 핀 기능과 구성 옵션은 제조사 데이터시트를 참조하십시오. 임베디드 시스템 설계와 PCB 레이아웃에 필수적입니다.
다음에 대한 상세 핀아웃 데이터 없음: ATMEGA328P-MMH.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
ATMEGA328P-MMH 적합 용도: 6 애플리케이션s: Compact Arduino-Compatible Embedded Controller, USB-to-Serial Data Acquisition, Industrial Sensor and Condition Monitoring Node, LED Lighting and Display Sequencer, Networked Communication and Gateway Controller, Educational Robotics and Embedded Prototyping.
Compact Arduino-Compatible Embedded Controller
The ATMEGA328P-MMH fits compact Arduino-compatible control boards because it combines a 20 MHz 8-bit AVR core with 32 KB of ISP Flash, 2 KB of SRAM, and 1 KB of EEPROM. Those resources support small control loops, peripheral drivers, and protocol handling without external program memory. Its I2C, SPI, and UART/USART interfaces allow sensors, displays, and serial adapters to share one controller. The 28-VQFN 4 x 4 mm package reduces board area, but the exposed-pad layout and fine-pitch assembly make stencil design and process control essential. Engineers should verify the official pin map, reset circuit, clock arrangement, and boot behavior before adapting an existing Arduino-style board.
추천
USB-to-Serial Data Acquisition
ATMEGA328P-MMH is suitable for a small data-acquisition controller that gathers sensor readings and forwards them through a host interface. The device's 2 KB of SRAM provides working space for buffering, while 32 KB of Flash accommodates acquisition routines and serial protocols. SPI can support higher-throughput sensors or external memory, and UART/USART provides a straightforward path to a USB bridge such as the CP2102N-A01-GQFN20R. Because the target is a surface-mount 28-VQFN, the design must accommodate high-speed decoupling and programming access. Firmware should include startup calibration, timeout handling, and framing because the microcontroller does not itself provide a native USB interface.
추천
Industrial Sensor and Condition Monitoring Node
The ATMEGA328P-MMH can serve as the local controller in an industrial sensor node that combines periodic measurements with a low-power communications link. Its 32 KB Flash and 2 KB SRAM are appropriate for moderate protocol stacks and buffering, while EEPROM preserves small configuration values. I2C accommodates temperature sensors and other low-speed peripherals, and UART/USART supports a modem or gateway. The 20 MHz rating provides useful processing margin for filtering and diagnostics. Deployment planning should account for the supplied 4.5 V to 5.5 V supply indication, transient protection, reset behavior, and grounded sensor references; a 4 x 4 mm VQFN also requires inspection under magnification after reflow.
추천
LED Lighting and Display Sequencer
ATMEGA328P-MMH is well matched to LED lighting, signage, or display sequencing because its 23 general-purpose I/O lines and 20 MHz clock can drive timing, dimming, and status logic. Its 2 KB SRAM supports display buffers, while 32 KB of Flash accommodates animation tables, communication parsers, and fault logging. PWM-capable timer resources can generate repeatable dimming behavior where the verified device data confirms the relevant peripherals, and UART/USART can receive commands from a host controller. Board design should separate high-current LED drive paths from sensitive microcontroller grounding and place local supply decoupling close to the VQFN pins. Firmware must account for thermal rise and provide current limiting or constant-current drive stages.
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Networked Communication and Gateway Controller
ATMEGA328P-MMH can act as a compact communications gateway when the design needs local protocol processing before data reaches a higher-bandwidth interface. Its I2C and SPI peripherals support sensors, transceivers, and local storage, while UART/USART bridges to wireless or wired modules. The 32 KB Flash and 2 KB SRAM suit lightweight gateways rather than complex TCP/IP stacks, so protocol footprint should be reviewed before firmware commitment. An ENC28J60/SS can provide an Ethernet path where appropriate, and the MAX232DR can support legacy RS-232 equipment. The principal layout concern is return-current control: keep serial and Ethernet return paths away from clock and sensor references, and provide robust surge protection at external connectors.
추천
Educational Robotics and Embedded Prototyping
ATMEGA328P-MMH is appropriate for educational robotics and embedded-control prototypes built around the AVR ecosystem. Students can exercise timers, interrupts, GPIO, ADC-related functions, and the I2C, SPI, and UART/USART peripherals using a compact 20 MHz controller. The 32 KB Flash provides enough room for structured examples, while EEPROM can retain counters or calibration values. Companion parts such as the SN74HC595 and TCA9657 make output expansion straightforward, and the MAX232DR supports serial teaching and laboratory exercises. For classroom assembly, however, a leaded development board is often more serviceable than a 4 x 4 mm VQFN. Production derivatives still require official pin verification, programming-test access, and controlled reflow.
추천
추천 제품 요약
엔지니어링 참조 데이터: ATMEGA328P-MMH — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ATMEGA328-MMH | ATMEGA168PA-MMH | ATMEGA48PA-MMH | ATMEGA88A-MMH | ATMEGA168A-MMH |
|---|---|---|---|---|---|---|
| Package | 28-VQFN (MMH) | 28-VQFN (MMH) | 28-VQFN (MMH) | 28-VQFN (MMH) | 28-VQFN (MMH) | 28-VQFN (MMH) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC |
주요 차별점
- Largest verified memory configuration among the qualified same-package family choices (vs ATMEGA168PA-MMH)
- 20 MHz operating class with integrated serial interfaces (vs ATMEGA328-MMH)
- Compact 28-VQFN surface-mount implementation (vs ATMEGA48PA-MMH)
설계 노트
Treat the exposed thermal pad and 28 fine-pitch leads as a controlled assembly problem. Follow the manufacturer land pattern for copper, solder-mask, paste, and stencil geometry; verify the pad's electrical connection in the official package drawing. Do not infer exposed-pad connectivity from generic VQFN examples. Keep the footprint dimensions inside the manufacturer tolerance and place programming or test pads on accessible board edges. After reflow, inspect the dense lead fields and pad under magnification because bridging or insufficient solder can make a 4 x 4 mm MCU harder to inspect and rework.
Provide local supply decoupling close to the device and route it with a short, low-impedance return path. The supplied comparison record states 4.5 V to 5.5 V for the target, but that same secondary result conflicts with the verified 20 MHz listing; confirm the official operating ranges before fixing the clock and supply design. Include a defined reset strategy, validate startup behavior across the intended supply range, and avoid routing noisy switching-current returns through the microcontroller ground reference. If the board also powers LEDs, motors, or radio modules, use separate power branches and local bulk decoupling to prevent transients from corrupting the MCU rail.
Do not substitute an ATmega328PB or a different manufacturer's 8-bit MCU without checking every signal. The supplied replacement discussion states that ATMEGA328PB may require two pins to be disconnected, and an ATmega168PA or ATMEGA48PA device can require materially less program and data memory. Verify Flash utilization, SRAM peak use, EEPROM endurance, timer channels, pin multiplexing, interrupt vectors, fuse defaults, and package drawing. Also verify ISP and bootloader behavior. A common package name alone does not prove that the target firmware will operate without modification.
Preserve signal integrity on external communication and sensor lines. Route I2C and SPI away from switching nodes and high-current LED paths, and provide common-mode return continuity beneath the board. The UART/USART connection to a USB bridge or transceiver should have a controlled ground relationship and appropriately terminated connector protection. Place input filtering close to the connector or sensor, keep oscillator routing short where an external crystal is used, and avoid long stubs on high-speed SPI lines. Validate the final layout with signal-integrity and EMC testing because the compact package can otherwise create hidden return-path discontinuities.
규정 준수 정보
The verified packaging record identifies ATMEGA328P-MMH as Green with NiPdAu terminal finish and lists it as ACTIVE. RoHS, REACH, halogen-free, conflict-mineral, and automotive qualification statements were not supplied, so those fields remain unknown.
