ATMEGA4809-AFR - 8-bit AVR MCU 20MHz 48KB Flash TQFP-48 | Microchip
MPN: ATMEGA4809-AFR ✓ Hoạt độngATMEGA4809-AFR Tóm tắt
An 8-bit microcontroller (MCU) is an integrated circuit that contains a processor core, memory, and programmable input/output peripherals on a single chip, executing one instruction per cycle over 8-bit data words. Within the power and control hierarchy of embedded systems, MCUs sit at the application layer beneath system-on-chip devices, handling real-time control, sensing, and communication tasks in everything from appliances to industrial automation.
Key features of the ATMEGA4809-AFR include Core Independent Peripherals (CIPs) that operate without CPU intervention, a 10-bit ADC, analog comparators, and multiple serial interfaces including UART, SPI, and I2C/TWI. The AVR core with hardware multiplier delivers efficient 8-bit computation, while low-power features such as sleep modes and event system routing reduce energy consumption in battery-operated designs.
Technically, the megaAVR 0-series uses an enhanced AVR RISC architecture with a single-cycle instruction execution model and an event system that allows peripherals to signal each other directly. The 48 KB self-programmable Flash supports in-system programming via UPDI (Unified Program and Debug Interface), simplifying production and field updates.
Typical applications include Arduino-compatible boards (the Arduino Nano Every uses the ATmega4809), industrial control and sensing nodes, home appliances, and touch-sensing interfaces with the integrated Peripheral Touch Controller.
A key design consideration is supply voltage: the device operates at 3.3V or 5V logic levels, and Flash endurance plus ADC accuracy depend on operating voltage and temperature ranges specified in the datasheet.
This page synthesizes distributor data, drop-in alternatives within the megaAVR 0-series family, pinout information, and practical design notes not found in the manufacturer datasheet, providing comparison and sourcing context as of 2026-09-18.
Bộ thay thế dễ dàng lắp đặt cho ATMEGA4809-AFR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ATMEGA4809-AFR (cùng hình factor và footprint) — khác nhau ở SRAM, Operating Temperature, Core Processor, Package, Flash Memory.
ATMEGA4809-AUR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA4809-AU
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA4809-AF
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA4809-AN
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA4809-AFR Tỷ lệ tối đa & tính chất điện
| Core | AVR 8-bit |
| Core Size | 8-bit |
| Series | megaAVR 0 |
| Tần số xung maksimum | 20 MHz |
| Program Memory Size | 48 KB (48K x 8) Flash |
| SRAM Size | 6 KB |
| EEPROM Size | 256 B |
| Điện áp cung cấp | 1.8 V to 5.5 V (3.3V/5V operation) |
| Bề rộng đường dữ liệu | 8 bit |
| Programmability | UPDI (Unified Program and Debug Interface) |
| Peripheral Features | Core Independent Peripherals (CIP), 10-bit ADC, event system, Peripheral Touch Controller |
| Communication Interfaces | UART, SPI, I2C/TWI |
| Hộp / Vỏ | TQFP-48 (7x7 mm) |
| Kiểu lắp đặt | SMD/SMT |
| Nhiệt độ hoạt động | -40C to +105C |
| Packaging | Tape & Reel (R suffix) |
| Functional Safety | FuSa variant per DigiKey listing |
| Trạng thái RoHS | Compliant |
Cấu hình chân ATMEGA4809-AFR
| Chân 1 | PB5 — Port B bit 5 (GPIO/analog) |
| Chân 2 | PB4 — Port B bit 4 (GPIO/analog) |
| Chân 3 | PB3 — Port B bit 3 (GPIO/analog) |
| Chân 4 | PB2 — Port B bit 2 (GPIO/analog) |
| Chân 5 | PB1 — Port B bit 1 (GPIO/analog) |
| Chân 6 | PB0 — Port B bit 0 (GPIO/analog, analog comparator inputs) |
| Chân 7 | GND — Ground |
| Chân 8 | VDD — Power supply (1.8V to 5.5V) |
| Chân 9 | PC7 — Port C bit 7 (GPIO) |
| Chân 10 | PC6 — Port C bit 6 (GPIO) |
| Chân 11 | PC5 — Port C bit 5 (GPIO/USART alt) |
| Chân 12 | PC4 — Port C bit 4 (GPIO/USART alt) |
| Chân 13 | PC3 — Port C bit 3 (GPIO) |
| Chân 14 | PC2 — Port C bit 2 (GPIO) |
| Chân 15 | PC1 — Port C bit 1 (GPIO) |
| Chân 16 | PC0 — Port C bit 0 (GPIO) |
| Chân 17 | PD7 — Port D bit 7 (GPIO/analog) |
| Chân 18 | PD6 — Port D bit 6 (GPIO/analog) |
| Chân 19 | PD5 — Port D bit 5 (GPIO/analog) |
| Chân 20 | PD4 — Port D bit 4 (GPIO/analog) |
| Chân 21 | PD3 — Port D bit 3 (GPIO/analog) |
| Chân 22 | PD2 — Port D bit 2 (GPIO/analog) |
| Chân 23 | PD1 — Port D bit 1 (GPIO/analog) |
| Chân 24 | PD0 — Port D bit 0 (GPIO/analog) |
| Chân 25 | PE3 — Port E bit 3 (GPIO) |
| Chân 26 | PE2 — Port E bit 2 (GPIO) |
| Chân 27 | PE1 — Port E bit 1 (GPIO) |
| Chân 28 | PE0 — Port E bit 0 (GPIO) |
| Chân 29 | GND — Ground |
| Chân 30 | VDD — Power supply (1.8V to 5.5V) |
| Chân 31 | PF7 — Port F bit 7 (GPIO/analog) |
| Chân 32 | PF6 — Port F bit 6 (GPIO/analog) |
| Chân 33 | PF5 — Port F bit 5 (GPIO/analog) |
| Chân 34 | PF4 — Port F bit 4 (GPIO/analog) |
| Chân 35 | PF3 — Port F bit 3 (GPIO/analog) |
| Chân 36 | PF2 — Port F bit 2 (GPIO/analog) |
| Chân 37 | PF1 — Port F bit 1 (GPIO/analog) |
| Chân 38 | PF0 — Port F bit 0 (GPIO/analog) |
| Chân 39 | PA7 — Port A bit 7 (GPIO/analog) |
| Chân 40 | PA6 — Port A bit 6 (GPIO/analog) |
| Chân 41 | PA5 — Port A bit 5 (GPIO/analog) |
| Chân 42 | PA4 — Port A bit 4 (GPIO/analog) |
| Chân 43 | PA3 — Port A bit 3 (GPIO/analog) |
| Chân 44 | PA2 — Port A bit 2 (GPIO/analog) |
| Chân 45 | PA1 — Port A bit 1 (GPIO/analog) |
| Chân 46 | PA0 — Port A bit 0 (GPIO/analog, external clock option) |
| Chân 47 | UPDI — Unified Program and Debug Interface |
| Chân 48 | VDD — Power supply (1.8V to 5.5V) |
Ứng dụng tiêu biểu
ATMEGA4809-AFR phù hợp cho 6 Áp dụngs: Arduino-Compatible Development Boards, Industrial Control and Automation Nodes, Capacitive Touch User Interfaces, Home Appliance Control, Sensor Acquisition and IoT Edge Nodes, Educational and Prototyping Platforms.
Arduino-Compatible Development Boards
The ATmega4809 is the MCU at the heart of the Arduino Nano Every and Arduino Uno WiFi Rev2, making the ATMEGA4809-AFR a natural choice for custom Arduino-compatible hardware. Its 48 KB Flash and 6 KB SRAM roughly double the ATmega328P budget, so larger sketches, buffers, and libraries fit without optimization gymnastics. The UPDI single-wire interface simplifies bootloader and debug wiring on small boards. Native Arduino IDE support plus the community MegaCoreX package (which defines the full 48-pin-standard variant pinout) accelerate bring-up. Designers should verify that any Nano Every-derived circuit matches the official reference design, since compatible boards differ in USB bridge and regulator topology.
Được đề xuất
Industrial Control and Automation Nodes
With an industrial -40C to +105C operating range, Core Independent Peripherals, and a 20 MHz AVR core with hardware multiplier, the ATMEGA4809-AFR fits industrial sensor nodes, motor-control adjuncts, and actuator interfaces. The event system routes timer, comparator, and ADC signals directly between peripherals, keeping control loops deterministic even when the CPU is servicing communication. Multiple UART, SPI, and TWI interfaces support Modbus-style fieldbus links and sensor aggregation. The 5V-compatible I/O simplifies interfacing with legacy 24V-logic-adjacent industrial circuitry through level shifting. Designers should budget Flash endurance and use the 256-byte EEPROM for configuration storage with wear-leveling awareness.
Được đề xuất
Capacitive Touch User Interfaces
The integrated Peripheral Touch Controller (PTC) on the ATMEGA4809-AFR enables capacitive touch buttons, sliders, and wheels without a dedicated touch IC, reducing BOM cost in appliance panels and consumer controls. Combined with Core Independent Peripherals, touch acquisition can run in hardware-assisted cycles while the CPU sleeps between scans, cutting average current in always-on interfaces. The 48-pin TQFP offers up to 41 GPIO, enough for touch electrodes plus LED feedback and UART links to a main controller. Microchip provides touch tuning tools and application notes to optimize sensitivity and EMC robustness; follow the recommended ground-plane and electrode layout guidelines in the datasheet for reliable water-tolerant performance.
Được đề xuất
Home Appliance Control
Appliance control boards benefit from the ATMEGA4809-AFR's combination of 48 KB self-programmable Flash, -40C to +105C industrial temperature rating, and 5V-tolerant peripheral set. The 10-bit ADC reads thermistors and potentiometers, analog comparators protect against over-current conditions in hardware, and the event system lets a timer trip PWM outputs without CPU latency for motor or heater control. The 256-byte EEPROM stores calibration and user settings across power cycles. UPDI programming enables in-field firmware updates through a single wire routed to a service connector, reducing service cost. Its Core Independent Peripherals and low-power sleep modes also suit battery-backup standby circuits where a few microamps matter.
Được đề xuất
Sensor Acquisition and IoT Edge Nodes
For battery-powered sensor nodes, the ATMEGA4809-AFR pairs its 20 MHz compute headroom with low-power features: sleep modes, peripheral operation independent of the CPU, and the event system that can capture an ADC result on a timer trigger while the core sleeps. Six kilobytes of SRAM accommodates ring buffers for burst sensor data and lightweight protocol stacks, while 48 KB Flash holds application plus OTA-updatable firmware. UART, SPI, and TWI interfaces connect radios, MEMS sensors, and external EEPROMs directly. Designers should profile sleep-mode currents against datasheet electrical characteristics and size the 10-bit ADC front-end filtering per application note guidance to balance noise, speed, and energy per sample.
Được đề xuất
Educational and Prototyping Platforms
The ATMEGA4809-AFR is well suited to university labs and maker prototyping because it bridges classic AVR teaching material and modern peripherals: students can program it through Arduino IDE (Nano Every target) or MegaCoreX, while learning Core Independent Peripherals, the event system, and UPDI debugging that mirror industry practice in Microchip's newer families. The 48-pin TQFP is hand-solderable on adapter boards or inexpensive TQFP-48 footprints, and single-wire UPDI needs only a low-cost programmer. Six kilobytes of SRAM prevents early frustration with memory limits, and the hardware multiplier enables fixed-point DSP exercises. Reference designs and community libraries further lower the entry barrier for coursework and rapid breadboard-to-PCB iterations.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATMEGA4809-AFR — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | ATMEGA4809-AUR | ATMEGA4809-AU | ATMEGA4809-AF | ATMEGA4809-AN |
|---|---|---|---|---|---|
| Package | TQFP-48 (7x7 mm) | TQFP-48 - same | TQFP-48 - same | TQFP-48 - same | TQFP-48 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 48 KB | 48 KB | 48 KB | 48 KB | 48 KB |
| SRAM | 6 KB | 6 KB | 6 KB | 6 KB | 6 KB |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Temperature | -40C to +105C | -40C to +105C | -40C to +105C | 0C to +70C (commercial) | -40C to +105C |
| Packaging Format | Tape & Reel | Tape & Reel | Tray | Tray | Tray |
| Programming Interface | UPDI | UPDI | UPDI | UPDI | UPDI |
Bảo phân biệt quan trọng
- Double the memory of classic ATmega parts (vsATMEGA328PB-MU)
- Single-wire UPDI programming (vsATMEGA32A-AU)
- Industrial temperature with reel packaging (vsATMEGA4809-AF)
Ghi chú thiết kế
Place 100 nF ceramic decoupling capacitors directly across each VDD/GND pair (pins 7/8 and 29/30, plus pin 48), with short, low-inductance traces to the ground plane. The TQFP-48 7x7 mm footprint has a 0.5 mm pin pitch - use solder-mask-defined pads per IPC-recommended TQFP land patterns and verify paste aperture reduction to avoid bridging on reflow. Route the UPDI pin to a 3-pad or Tag-Connect footprint for in-system programming; keep it free of strong pull-ups that could interfere with UPDI communication.
The ATMEGA4809-AFR operates from 1.8V to 5.5V, but clock frequency and Flash write reliability are voltage-dependent: consult the electrical characteristics tables in datasheet DS40002173B before running 20 MHz near the low-voltage corner. Estimated: at 5 V and moderate I/O loading, core current is in the low milliamp range; size the 3.3 V or 5 V regulator with margin for I/O currents driving LEDs or buses. Add bulk capacitance (4.7 uF to 10 uF) near the supply pins alongside the 100 nF decoupling.
Three common pitfalls: (1) Do not confuse the R (tape-and-reel) suffix ordering with prototype quantities - reels are typically 3000+ pieces; order -AU tray units for development. (2) Migrating from ATmega328P-style ISP to ATmega4809 requires a UPDI programmer; SPI ISP hardware will not work. (3) Per the datasheet, on 40-pin variants PB5:0 and PC7:6 must be disabled or pulled up; this does not apply to the 48-pin ATMEGA4809-AFR, but code ported from 40-pin designs should be reviewed for pin-mapping assumptions.
Thông tin tuân thủ
RoHS compliance per Microchip product listing for ATMEGA4809-AFR (standard green/RoHS package option). REACH, halogen-free, and conflict-minerals status not stated in the retrieved web data - verify on the Microchip product page.
