ATMEGA4808-MU - 8-Bit AVR MCU 20MHz 48KB Flash | Microchip
Артикул: ATMEGA4808-MU ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
ATMEGA4808-MU Обзор
A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and peripherals into one chip, forming the highest-volume class of embedded processors used from toys to automotive systems. The 8-bit AVR architecture sits within the broader microcontroller taxonomy alongside 16-bit and 32-bit cores, trading raw compute for deterministic, low-power, low-cost control.
Key features of the ATmega4808 include a hardware multiplier, core-independent peripherals (CIP), and a flexible Event System that routes signals between peripherals without CPU intervention, reducing interrupt latency and jitter. Functional Safety (FuSa) support makes it suitable for safety-relevant designs, and the AVR core executes most instructions in a single cycle.
Architecturally, the megaAVR 0-series uses an advanced AVR core with a two-stage pipeline, Harvard memory organization, and single-cycle I/O access. Peripherals typically include multi-channel USARTs, SPI and I2C (TWI) interfaces, analog-to-digital converters, timers with PWM capability, and configurable custom logic (per Microchip family documentation), all clocked from internal oscillators or external crystals up to 20 MHz.
Typical applications include industrial automation and sensor nodes, consumer appliances, and IoT end nodes where a 20 MHz 8-bit core, 48 KB Flash, and 32-pin VQFN footprint balance cost, performance, and board area. The compact 5x5 mm QFN also suits space-constrained portable designs.
A key design consideration is supply voltage: verify the operating voltage range and VQFN exposed-pad grounding in the ATmega4808/4809 datasheet (DS40002173) before layout, and provide adequate decoupling on each VDD pin.
This page synthesizes distributor availability data, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet, with pricing and stock referenced as of 2026-09-18.
Аналоги без доработки для ATMEGA4808-MU — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с ATMEGA4808-MU (тот же форм-фактор и посадочное место) — отличается по Core Processor, Package, EEPROM, Flash Memory Size, SRAM.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
ATMEGA3208-MUR
✅ Прямая замена ⚠️ Характеристики не проверены✓ В наличии
$1.24 / шт.
Открыть даташит →ATMEGA1608-MU
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
ATMEGA808-MU
✅ Прямая замена ⚠️ Характеристики не проверены✓ В наличии
$0.68 / шт.
Открыть даташит →ATMEGA4808-MFR
✅ Прямая замена✓ В наличии
$0.82 / шт.
Открыть даташит →ATMEGA4808-MU Максимальные параметры и электрические характеристики
| Core Processor | AVR (megaAVR 0-series), 8-bit RISC |
| Core Size | 8-bit |
| Максимальная тактовая частота | 20 MHz |
| Flash Memory Size | 48 KB (24K x 16) |
| SRAM Size | 6 KB |
| EEPROM Size | 256 bytes |
| Корпус | 32-VQFN (5x5 mm) |
| Тип монтажа | Surface Mount |
| Hardware Multiplier | Yes |
| Safety Feature | Functional Safety (FuSa) |
| Programmable via | UPDI (Unified Program and Debug Interface) |
Руководство по цоколевке ATMEGA4808-MU в корпусе 32-vqfn (5x5 mm)
Цоколевка для ATMEGA4808-MU (корпус 32-vqfn (5x5 mm)). Эта цифровая ИС включает выводы GPIO, интерфейсы связи (UART, SPI, I2C) и выводы питания. Обратитесь к техническому описанию производителя для альтернативных функций выводов и вариантов конфигурации. Необходимо для проектирования встраиваемых систем и трассировки печатных плат.
Нет подробных данных о распиновке для ATMEGA4808-MU.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
ATMEGA4808-MU подходит для 6 применениеs: Industrial Automation and Control, IoT Sensor Nodes, Consumer Appliances, Embedded Sensor Interfaces, Motor Control (Small), Human-Machine Interfaces (HMI).
Industrial Automation and Control
The ATMEGA4808-MU fits industrial automation nodes because its 20 MHz AVR core with hardware multiplier executes control loops deterministically while the Event System routes timer and ADC events peripheral-to-peripheral without CPU intervention, minimizing jitter in motor and actuator timing. With 48 KB Flash and 6 KB SRAM, it hosts protocol handling, state machines, and logging headroom for retrofit designs. In a typical node it polls sensors over SPI or I2C, drives PWM outputs, and reports over USART to a SCADA gateway. The Functional Safety (FuSa) designation supports deployment in safety-relevant subsystems when combined with system-level analysis. The 32-VQFN 5x5 mm package suits DIN-rail and compact IO modules.
Рекомендуется
IoT Sensor Nodes
For IoT end nodes, the ATMEGA4808-MU acts as the low-power application controller that reads environmental sensors, manages a radio module over UART or SPI, and supervises power sequencing. Its 6 KB SRAM comfortably buffers protocol frames (MQTT, BLE GATT payloads) handled by an external radio, while 48 KB Flash reserves space for a bootloader plus field-updatable application images - a key advantage over 16 KB parts that force tight code budgets. The megaAVR 0-series peripherals include multiple sleep modes and a 12-bit ADC class of analog peripherals, supporting periodic sampling with long sleep intervals on battery or energy-harvesting supplies. The 5x5 mm 32-VQFN footprint fits coin-cell-sized PCBs.
Рекомендуется
Consumer Appliances
Consumer appliances - coffee machines, fans, small pumps, and thermostats - benefit from the ATMEGA4808-MU's balance of cost, flash headroom, and peripheral integration. The 20 MHz core with single-cycle I/O handles capacitive-touch scanning, encoder input, and buzzer or LED multiplexing concurrently, while the Event System lets a timer directly gate PWM output for fan speed control without software latency. The 48 KB Flash accommodates localized UI strings, hysteresis tables, and OTA-capable bootloaders that 16 KB devices cannot fit. Its 32-pin VQFN 5x5 mm package reflows on single-sided two-layer boards typical of appliance cost targets, and the megaAVR 0-series internal oscillator removes the crystal BOM line for non-precision timing.
Рекомендуется
Embedded Sensor Interfaces
As a sensor interface controller, the ATMEGA4808-MU bridges analog front ends and digital buses: its ADC-class analog peripherals digitize thermistor, bridge, or potentiometer inputs while hardware SPI/I2C/USART links forward filtered readings to a host. The 20 MHz core and hardware multiplier execute IIR/FIR filtering and linearization math in real time without a DSP, and 6 KB SRAM provides calibration tables and DMA-style buffering through the Event System. The 48 KB Flash supports multi-sensor firmware plus a command interpreter, and the 256-byte EEPROM retains calibration constants through power cycles. The 32-VQFN 5x5 mm footprint integrates cleanly on small sensor daughterboards.
Рекомендуется
Motor Control (Small)
The ATMEGA4808-MU suits small brushed-DC and stepper motor control in appliances and HVAC dampers. Its timers generate complementary PWM while the Event System ties comparator or ADC thresholds directly to peripheral actions for cycle-by-cycle current limiting with minimal CPU load - important at 20 kHz switching rates where interrupt latency would otherwise dominate. The hardware multiplier supports 16-bit PID computations within control-loop deadlines at 20 MHz. With 48 KB Flash, field-oriented or sensorless startup routines plus a communication stack coexist without external memory. Designers should verify PWM channel counts and timer resources in the ATmega4808/4809 datasheet against their specific motor topology before finalizing the BOM.
Рекомендуется
Human-Machine Interfaces (HMI)
For keypad-and-display HMI boards, the ATMEGA4808-MU manages button scanning (including capacitive touch), LED or small LCD multiplexing, and buzzer feedback while communicating with a main controller over UART or I2C. The 20 MHz core provides headroom for debouncing, gesture timing, and menu logic simultaneously, and 48 KB Flash stores multi-language string tables and animation frames that smaller 8/16 KB parts cannot hold. The Event System offloads periodic display refresh timing, keeping CPU availability high for input responsiveness. Its 32-pin VQFN 5x5 mm package suits PCBs mounted behind fascia panels where board area is constrained by enclosure geometry.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для ATMEGA4808-MU — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | ATMEGA3208-MU | ATMEGA1608-MU | ATMEGA808-MU | ATMEGA4808-MFR |
|---|---|---|---|---|---|
| Package | 32-VQFN (5x5 mm) | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN variant (MFR) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 48 KB | 32 KB | 16 KB | 8 KB | 48 KB |
| SRAM | 6 KB | 4 KB | 2 KB | 1 KB | 6 KB |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Core | 8-bit AVR (megaAVR 0-series) | 8-bit AVR (megaAVR 0-series) | 8-bit AVR (megaAVR 0-series) | 8-bit AVR (megaAVR 0-series) | 8-bit AVR (megaAVR 0-series) |
Ключевые отличия
- Largest Flash in the same 32-VQFN footprint (против ATMEGA3208-MU)
- Most SRAM in the family for the package (против ATMEGA1608-MU)
- Functional Safety (FuSa) support (против ATMEGA808-MU)
- Trade-off: higher cost than smaller Flash variants (против ATMEGA808-MU)
Заметки по проектированию
Place a 100 nF ceramic decoupling capacitor at each VDD pin of the ATMEGA4808-MU as close to the pad as possible, plus one bulk capacitor (4.7-10 uF) per supply domain, per Microchip's megaAVR 0-series hardware design guidance. Because the 32-VQFN has multiple power/ground pairs, route each VDD via directly to its own capacitor before tying to the power plane. Confirm the exact operating voltage range in the ATmega4808/4809 datasheet (DS40002173C) before finalizing the regulator selection, as this snapshot did not capture supply limits.
The MU package is a 32-pin VQFN 5x5 mm with an exposed die pad. Solder the exposed pad to a grounded copper pour with an array of thermal vias - this is not optional; the pad frequently provides the primary ground return and improves thermal performance. Use a solder-paste stencil with approximately 50-70% coverage segmented into squares to avoid component floating during reflow. Follow Microchip's QFN land-pattern recommendations in the datasheet mechanical drawings rather than generic IPC footprints when possible.
The megaAVR 0-series programs and debugs through a single-wire UPDI interface, not the older ISP/JTAG used by classic AVRs like the ATmega328P - plan your programming header accordingly. Also, Pin Module (PORT) configuration and peripheral multiplexing differ from classic AVR parts; porting ATmega328P code requires register-level rework even when functionality is equivalent. Finally, when substituting ATMEGA3208/1608/808 for the 4808, verify Flash and SRAM utilization in your map file, as SRAM shrinks along with Flash across the family.
Информация о соответствии
Verified web data did not include explicit compliance declarations for this MPN. Confirm RoHS/REACH status on the Microchip ATMEGA4808 product page before procurement.
