ATMEGA4808-XF - 8-bit AVR MCU 20MHz 48KB Flash | Microchip
MPN： ATMEGA4808-XF ✓ 啟用中ATMEGA4808-XF 概覽
An 8-bit AVR microcontroller is a single-chip Harvard-architecture processor that integrates a RISC CPU, non-volatile program memory, SRAM data memory, and peripheral controllers (serial ports, timers, ADC) within one IC. Within the power-management-and-embedded hierarchy, it belongs to the microcontroller (MCU) category: MCU -> embedded processor -> integrated circuit. The megaAVR 0-series is Microchip's modernized AVR family, replacing the classic ATmega328 generation with richer peripherals and Core Independent Peripherals (CIPs).
Key features include the AVR RISC CPU with hardware multiplier for efficient math, up to 48 KB Flash / 6 KB SRAM / 256 B EEPROM, a 10-bit ADC, analog comparators, RTC, and multiple USARTs, SPI and TWI (I2C) interfaces. Functional Safety (FuSa) support and an RTC with CIP operation reduce external component count.
Technically, the ATmega4808 uses the latest AVR core with single-cycle I/O access and event routing between peripherals, enabling deterministic, software-light operation. The event system and sleep modes support low-power, interrupt-driven designs.
Typical applications include industrial control and automation nodes, home-appliance and HVAC control boards, and legacy ATmega328-based designs migrating to a modern AVR with more memory and peripherals.
A key design consideration is clocking: the internal 20 MHz oscillator removes the need for an external crystal in most designs, but precise timing applications should verify clock accuracy against the datasheet.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 ATMEGA4808-XF — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ATMEGA4808-XF （相同外形與佔位） — 差異在於 SRAM, Series, Core Processor, Flash Memory, EEPROM.
ATMEGA3208-XF
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA1608-XFR
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA808-XF
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA4808-XF 最大額定值與電氣特性
| Core Processor | AVR (8-bit RISC) with hardware multiplier |
| Core Size | 8-bit |
| Speed | 20 MHz |
| Program Memory Type | FLASH |
| Program Memory Size | 48 KB (24K x 16) |
| SRAM | 6 KB |
| EEPROM | 256 bytes |
| Series | megaAVR 0-series (ATmega4808/4809) |
| 封裝 | 28-SOIC/28-SSOP (per DigiKey: 28-SSOP) |
| 安裝類型 | Surface Mount |
| 功能特色 | Functional Safety (FuSa) |
ATMEGA4808-XF 28-soic/28-ssop (per digikey: 28-ssop) 腳位配置指南
ATMEGA4808-XF（28-soic/28-ssop (per digikey: 28-ssop) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： ATMEGA4808-XF.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATMEGA4808-XF 適用於 6 應用s: Industrial Control and Automation Nodes, Home Appliance and HVAC Control, Sensor Nodes and IoT Edge Devices, Motor Control and Fan Interfaces, Battery-Powered Portable Instruments, ATmega328 Legacy Migration and New 5V Embedded Designs.
Industrial Control and Automation Nodes
The ATMEGA4808-XF fits industrial control nodes where a robust 8-bit MCU handles sensor polling, actuator control, and serial communication. Its 20 MHz AVR core with hardware multiplier accelerates scaling and fixed-point math for PID loops, while 48 KB Flash leaves headroom for protocol stacks and field-updatable firmware. Core Independent Peripherals (timers, comparators, event system) continue operating during CPU sleep, reducing latency in closed-loop control. The 28-pin SOIC/SSOP package suits compact DIN-rail and sensor-head boards. Its Functional Safety (FuSa) categorization supports designs targeting safety-related industrial functions; designers should follow the FuSa documentation package and Microchip safety manual when certifying the end application.
推薦
Home Appliance and HVAC Control
Appliance and HVAC control boards benefit from the ATMEGA4808-XF's combination of 48 KB Flash, 256 B EEPROM for stored user settings and calibration data, and an RTC peripheral for scheduling. The internal oscillator eliminates crystal cost on cost-sensitive appliance PCBs, and the 10-bit ADC family peripherals read NTC temperature sensors, potentiometers and current-shunt inputs. The 28-pin package keeps board area small for tight enclosures. Because appliance designs demand long product lifecycles, sourcing from multiple distributors (Octopart lists 8) plus the megaAVR 0-series family laddering (808/1608/3208 in the same footprint) gives buyers a memory-cost optimization path without PCB respin over the product's life.
推薦
Sensor Nodes and IoT Edge Devices
For sensor nodes, the ATMEGA4808-XF offers 6 KB SRAM - enough for buffered sensor data, a lightweight network stack, and OTA-update double-buffering strategies within 48 KB Flash. Core Independent Peripherals sample sensors and manage wake timers while the CPU sleeps, directly lowering average current draw in battery-powered nodes. USARTs, SPI and TWI (I2C) connect to RF modules and MEMS sensors; the event system routes peripheral signals without CPU intervention. The 28-pin SOIC/SSOP package suits both compact modules and cable-tethered remote heads. Developers can prototype quickly using the MegaCoreX Arduino package, then transition to bare-metal code for production power optimization.
推薦
Motor Control and Fan Interfaces
Basic motor and fan control (BLDC trapezoidal, DC brushed, stepper sequencing) maps well onto the ATMEGA4808-XF: TCA/TCB/TCD timer peripherals generate complementary PWM, the 10-bit ADC reads back EMF and current sense resistors, and analog comparators support over-current trip without CPU latency via the event system. The 20 MHz core with hardware multiplier executes control-loop math comfortably for low-speed 8-bit-class drives. The 28-pin package drives a small gate-driver front end. For cost-optimized products, the same-footprint ATMEGA1608-XF or ATMEGA3208-XF may be substituted when the control firmware fits in less Flash, allowing one PCB to serve multiple product tiers.
推薦
Battery-Powered Portable Instruments
Portable measurement instruments use the ATMEGA4808-XF for its low-power sleep modes, RTC-based wake scheduling, and 6 KB SRAM for data logging. The ADC and analog comparators form the front end for voltage/current measurement channels, while 48 KB Flash stores calibration tables and a display driver. The internal oscillator removes the crystal and its startup/power overhead. Firmware can implement duty-cycled sampling: sleep in power-down between conversions, wake via RTC, sample via event-triggered ADC, and burst-transmit over USART. The 28-pin SOIC/SSOP industrial-grade package suits handheld enclosures, and multiple memory-size options in the same footprint let vendors trim BOM cost per model.
推薦
ATmega328 Legacy Migration and New 5V Embedded Designs
Teams maintaining ATmega328-based products (Arduino-class boards, 3D-printer controllers, hobby products) can migrate to the ATMEGA4808-XF for doubled SRAM (6 KB vs 2 KB), 50% more Flash, a hardware multiplier, and modern peripherals, while staying in the familiar AVR ecosystem. Community tooling (MegaCoreX) provides Arduino compatibility, easing porting. The 20 MHz maximum clock matches the fastest classic AVRs, so timing budgets carry over. Because the 28-pin SOIC/SSOP footprint differs from the ATmega328's, migration requires a PCB revision; designing new boards directly around the megaAVR 0-series future-proofs the platform and provides a memory laddering path (808/1608/3208/4808) on one layout.
推薦
推薦產品摘要
工程參考資料，適用於 ATMEGA4808-XF — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ATMEGA3208-XF | ATMEGA1608-XF | ATMEGA808-XF |
|---|---|---|---|---|
| Package | 28-SOIC/SSOP | 28-SOIC/SSOP - same | 28-SOIC/SSOP - same | 28-SOIC/SSOP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 48 KB (24K x 16) | 32 KB | 16 KB | 8 KB |
| SRAM | 6 KB | 4 KB | 2 KB | 1 KB |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 128 bytes |
| Max CPU Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Hardware Multiplier | Yes | Yes | Yes | Yes |
主要差異化特點
- Largest Flash in the 28-pin megaAVR 0-series footprint (對比ATMEGA3208-XF)
- Functional Safety (FuSa) categorization (對比ATMEGA328P-AU)
- Memory laddering on one footprint (對比ATMEGA808-XF)
設計說明
Decouple VDD with a 100 nF ceramic capacitor placed within a few millimeters of the pin, plus a 1-10 uF bulk capacitor per supply rail. Verify the exact supply voltage range in the ATmega4808/4809 datasheet (DS40002173B) electrical characteristics table before finalizing the regulator; this page's verified data did not include the operating voltage window. If using a switching pre-regulator, add an LC filter or LDO ahead of the MCU when ADC accuracy matters, since switching ripple degrades ADC noise floor on 8-bit AVR parts.
Keep the UPDI programming pin (the single-wire debug/programming interface) accessible via a 3-pin header or tag-connect pad on production boards - the megaAVR 0-series cannot be programmed via legacy ISP, and losing UPDI access means rework or socket programming. Route the analog ADC inputs away from the switching/timer PWM traces on the 28-pin package, where pin density is high; a ground pour under the IC improves ADC reference stability and reduces crosstalk between the analog comparator inputs and fast digital edges.
The most common migration pitfall from ATmega328 designs is assuming register-level compatibility: the megaAVR 0-series uses a completely different peripheral register map and UPDI instead of ISP programming, so classic ISP programmers will not work. Another frequent error is forgetting that EEPROM writes on AVRs require the EEPROM-ready interrupt or polling before power-down - losing the last stored settings in an appliance is a field-failure mode. Budget Flash carefully: 48 KB is generous, but Arduino-style abstraction can consume it quickly; keep the same-footprint ATMEGA3208-XF in mind only when the design truly fits 32 KB.
合規資訊
RoHS/REACH/lead-free status not explicitly stated in the verified data as of 2026-09-18; the -F suffix conventionally denotes Pb-free packaging in Microchip nomenclature, but confirmation must come from Microchip's official product page or distributor environmental data.
