ATMEGA328P-MMHR - 20MHz 32KB Flash 8-Bit MCU | Microchip
N.º de pieza: ATMEGA328P-MMHR ✓ ActivoATMEGA328P-MMHR Descripción general
An 8-bit AVR microcontroller is a programmable semiconductor that combines a CPU core, Flash program memory, SRAM, EEPROM, timers, serial interfaces, and GPIO in one integrated circuit. Within the product hierarchy, it belongs to the AVR family of reduced-instruction-set microcontrollers, commonly called an MCU. Its integrated memory and peripherals allow a compact embedded design to replace separate processor, program-memory, and interface components.
The ATMEGA328P-MMHR provides 32 KB of read-while-write Flash, 2 KB of SRAM, and 1 KB of EEPROM according to the manufacturer-family datasheet result. Its feature set includes 32 general-purpose working registers, 23 I/O lines, a real-time counter, three flexible timer/counter blocks with compare and PWM modes, one USART, one two-wire serial interface, and a six-channel 10-bit ADC. These resources support compact control, sensing, communications, and actuator workloads.
The enhanced RISC-based AVR architecture executes most instructions in a single clock cycle, while the device supports clock frequencies up to 20 MHz for the ATMEGA328P-MMHR listing. Its peripherals reduce the need for external logic: PWM channels can drive indicators or power stages, the ADC can sample analog inputs, and the USART and I2C interface can connect sensors, displays, and service adapters. The 28-pin VQFN also supports high-density PCB placement, although its exposed-pad construction requires careful thermal design.
Typical uses include Arduino-compatible sensor nodes, compact industrial controllers, LED and motor-control boards, environmental monitoring products, and low-cost connected instruments. The 23 I/O lines provide external signal connections, while the 1 KB EEPROM is useful for retaining small configuration values. The 20 MHz clock also provides sufficient timing resolution for common control-loop, communication, and measurement tasks.
When laying out a board, follow the manufacturer pinout and land-pattern requirements rather than relying on generic QFN conventions. Provide the required supply decoupling at the power pins, route the exposed pad according to the package thermal guidance, and keep sensitive analog inputs away from high-current switching paths. Confirm the selected crystal or clock arrangement, programming interface, and fuse settings before releasing a production PCB.
This page consolidates verified distributor specifications, source-linked pricing and availability information, package details, and practical selection guidance. It also distinguishes a genuine same-package drop-in candidate from other ATmega devices whose package, pin count, or device features prevent unqualified substitution.
Alternativas directas para ATMEGA328P-MMHR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ATMEGA328P-MMHR (mismo factor de forma y huella) — difiere en RoHS Status, Package, Flash Memory, Communication Interfaces, EEPROM.
ATMEGA328P-MMH
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Ver hoja de datos →ATMEGA328P-MMHR Valores máximos y características eléctricas
| Product Type | 8-bit AVR Microcontroller |
| Maximum Clock Speed | 20 MHz |
| Flash Memory | 32 KB |
| Program Memory Organization | 16K x 16 |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| General-Purpose I/O Lines | 23 lines |
| General-Purpose Working Registers | 32 |
| ADC Resolution | 10-bit |
| ADC Channels | 6 channels |
| Timer/Counters | 3 |
| Serial Interfaces | 1 USART and 1 two-wire serial interface |
| Encapsulado | 28-pin VQFN, 4 x 4 mm |
| Tipo de montaje | Surface Mount |
| Tensión de alimentación | 4.5 V to 5.5 V |
| Real-Time Counter | Integrated |
| PWM Support | Yes, timer/counter compare modes support PWM |
| Estado del ciclo de vida | Active |
| Estado RoHS | unknown |
| REACH Status | unknown |
Guía de configuración de pines de ATMEGA328P-MMHR 28-pin vqfn, 4 x 4 mm
Configuración de pines para ATMEGA328P-MMHR (encapsulado 28-pin vqfn, 4 x 4 mm). Este CI digital incluye GPIO, interfaces de comunicación (UART, SPI, I2C) y pines de alimentación. Consulte la hoja de datos del fabricante para conocer las funciones alternativas de los pines y las opciones de configuración. Esencial para el diseño de sistemas embebidos y el diseño de PCB.
No hay datos detallados de patillaje disponibles para ATMEGA328P-MMHR.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
ATMEGA328P-MMHR es adecuado para 6 aplicacións: Arduino-Compatible Sensor Node, Compact Industrial Control Module, LED and Motor Control Board, Environmental Monitoring Instrument, Programmable Logic Controller, USB-UART Development Interface.
Arduino-Compatible Sensor Node
The ATMEGA328P-MMHR fits compact Arduino-compatible sensor nodes because it combines a 20 MHz AVR core, 32 KB of Flash, 2 KB of SRAM, and 23 general-purpose I/O lines in a 28-pin VQFN. Its six-channel 10-bit ADC can sample analog sensors, while one USART and one two-wire serial interface support host communication and external peripherals. The 4 x 4 mm package saves board area compared with larger leaded or TQFP devices, although the exposed-pad footprint requires manufacturer-compliant PCB construction. Firmware and peripheral assignments should be verified against the exact package pinout before production.
Recomendado
Compact Industrial Control Module
The ATMEGA328P-MMHR is suitable for compact industrial control modules that combine digital inputs, status indication, local sensing, and serial diagnostics. Its 20 MHz operating capability supports responsive timer/counter and PWM functions, while 23 I/O lines provide enough external connections for typical auxiliary control tasks. The three timer/counter blocks can support timing, capture, compare, and PWM workloads without additional timer ICs. For a compact control board, the 28-pin VQFN reduces area, but designers should provide robust decoupling, protected I/O paths, and thermal copper under the exposed pad according to the manufacturer package guidance.
Recomendado
LED and Motor Control Board
The ATMEGA328P-MMHR works well in small LED and motor-control boards because its three timer/counter blocks provide compare and PWM modes alongside 23 general-purpose I/O lines. It can generate timing signals for dimming, position indicators, or low-power motor drive stages while its ADC monitors feedback or supply conditions. At a maximum clock of 20 MHz, software timing remains responsive for many inexpensive control loops. The 28-pin VQFN allows a dense layout, but motor wiring can introduce transients; use suitable driver electronics, grounding, and isolation or filtering rather than driving loads directly from MCU pins.
Recomendado
Environmental Monitoring Instrument
The ATMEGA328P-MMHR can serve as the controller in a compact environmental monitor where periodic analog sampling and low-power serial reporting are required. Its six-channel 10-bit ADC supports multiple sensor inputs, while 1 KB of EEPROM can retain calibration identifiers or configuration values between resets. The USART provides a straightforward diagnostic path, and the two-wire interface can connect compatible sensors or display components. Because the retrieved data does not specify detailed sleep-current or analog-accuracy limits, battery-life and precision claims should be validated using the manufacturer datasheet. Firmware should also disable unused peripherals where low power is important.
Recomendado
Programmable Logic Controller
The ATMEGA328P-MMHR is appropriate for small programmable logic controller tasks involving digital sequencing, timers, and compact I/O. Twenty-three general-purpose I/O lines, three timer/counter blocks, and 2 KB of working SRAM provide enough resources for modest control sequences without external logic. The 20 MHz AVR core allows responsive event handling and communication with local programming or diagnostic equipment. Firmware should include watchdog and output-state initialization where required, while the hardware design should protect inputs from industrial transients. The small VQFN footprint reduces board area but demands careful land-pattern and exposed-pad manufacturing control.
Recomendado
USB-UART Development Interface
The ATMEGA328P-MMHR can form the embedded side of a USB-to-UART development interface when firmware handles bootloader activation and serial data transfer. Its USART provides the data path, while 32 KB of Flash is sufficient for compact bootloaders and configuration utilities; one USART and one two-wire serial interface are available for connected accessories. A companion USB-to-UART transceiver such as the CP2102N is a natural system-level choice. Verify the selected USB bridge voltage levels and boot-reset wiring, and do not assume that every Arduino bootloader or USB driver is compatible with a custom ATMEGA328P-MMHR board.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ATMEGA328P-MMHR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ATMEGA328P-MMH | ATMEGA328-MMH |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-pin VQFN, 4 x 4 mm | 28-pin VQFN | 28-pin VQFN |
| Device Type | 8-bit AVR Microcontroller | 8-bit AVR Microcontroller | 8-bit AVR Microcontroller |
Diferenciadores clave
- Compact 28-pin VQFN implementation of the established ATmega328P platform (frente a ATMEGA328P-MMH)
- 20 MHz maximum clock with integrated control and communication peripherals (frente a ATMEGA328-MMH)
- Compact package reduces PCB area without relying on a larger pin-count device (frente a ATMEGA328P-MNR)
Notas de diseño
Use the latest Microchip package drawing for the 28-pin VQFN rather than generating the land pattern from a generic library. Confirm pin 1 orientation, pad dimensions, solder-mask opening, exposed-pad connection, and paste stencil. Place the supply bypass capacitor adjacent to the appropriate power and ground pins, and provide a low-impedance ground return so the switching core does not share a noisy path with analog returns.
The ATMEGA328P-MMHR uses a compact VQFN package with an exposed thermal pad. Follow the manufacturer's maximum power dissipation and package thermal data, and connect the exposed pad to the intended ground plane using the specified land pattern. Estimated: at a 5.0 V supply, 3.0 V output, and 20 mA load, the regulator-style dissipation proxy is 40 mW, but actual junction temperature must be evaluated using the device's verified electrical limits and board thermal conditions.
Route oscillator, programming, reset, and communication signals away from noisy switching nodes and motor-driver wiring. Keep decoupling current paths short, use a continuous ground reference, and avoid long stubs between the MCU and passive components. If the board includes relays, displays, or wireless modules, separate their high-current returns from the MCU and ADC ground paths and add protection appropriate to the actual transient environment.
Do not treat an ATmega device with the same core description as a confirmed replacement. The ATMEGA328P-MMH and ATMEGA328-MMH candidates require verification of exact ordering suffixes, pin mapping, boot behavior, fuse defaults, electrical limits, and package revisions. Before production use, compare the manufacturer documentation, build representative firmware, test programming and reset, and validate every peripheral used by the original design.
Información de cumplimiento
The supplied verified results do not provide explicit RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive-qualification statements. The search snippet mentions RoHS and REACH only as comparison fields for another product and does not establish this part's status.
