ATMEGA808-AUR - 8-Bit AVR MCU 20MHz 8KB Flash | Microchip
料号： ATMEGA808-AUR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.63 | $1.63 |
| 10 | $1.55 | $15.50 |
| 100 | $1.35 | $135.00 |
| 500 | $1.2 | $600.00 |
| 1,000 | $1.09 | $1,090.00 |
ATMEGA808-AUR 概述
A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory (Flash), data memory (SRAM), non-volatile EEPROM, and peripherals such as timers, USART, SPI, I2C and ADC on one chip. Microcontrollers form the lowest layer of the embedded systems hierarchy: MCU -> embedded processor -> system-on-chip, and are the building blocks of virtually every electronic product.
Key features of the ATMEGA808-AUR include a 20 MHz maximum clock frequency with functionality maintained down to 1.8V, 8 KB of on-chip In-System Reprogrammable Flash organized with a 16-bit data width (AVR instructions are 16 or 32 bits wide), 1 KB of SRAM, and 256 bytes of Data EEPROM. The device also carries Functional Safety (FuSa) documentation support per Microchip's product listing, making it attractive for safety-relevant industrial designs.
The megaAVR 0-series uses Microchip's latest Core Independent Peripherals (CIPs), allowing peripherals such as timers and comparators to operate without CPU intervention, which reduces interrupt latency and software complexity. The AVR RISC architecture executes most instructions in a single cycle, and the hardware multiplier enables efficient 8x8 arithmetic for control loops and lightweight DSP tasks.
Typical applications include industrial automation and sensor nodes, motor control and power conversion, home appliances, and general-purpose embedded control where 8 KB of Flash is sufficient. The 32-pin TQFP offers 25+ GPIO and a 7x7 mm footprint suited to compact two- or four-layer boards.
Design consideration: Flash programming and debugging use the single-wire UPDI interface on pin PA0, so reserve UPDI access on your PCB for in-system programming.
This page synthesizes verified distributor pricing, same-family drop-in alternatives, and practical design notes not consolidated in the manufacturer datasheet. Pricing references are as of 2026-09-18.
直接替换替代料： ATMEGA808-AUR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATMEGA808-AUR （相同外形与封装尺寸） ——差异在于 Series, Packaging, Peripherals, Core Processor, Programming Interface.
快速对比工具——选择替代料号进行并排对比：
ATMEGA1608-AUR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.92 / 个
查看数据手册 →ATMEGA3208-AUR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.94 / 个
查看数据手册 →ATMEGA4808-AUR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.98 / 个
查看数据手册 →ATMEGA808-AF
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATMEGA808-AUR 最大额定值与电气特性
| Core Processor | AVR (8-bit RISC with hardware multiplier) |
| Core Size | 8-bit |
| Series | megaAVR 0 |
| 最大时钟频率 | 20 MHz |
| Flash Program Memory | 8 KB (8K x 8) |
| SRAM Data Memory | 1 KB |
| EEPROM | 256 bytes |
| Minimum Operating Voltage | 1.8 V |
| 封装 | 32-TQFP (7x7 mm) |
| 安装类型 | Surface Mount |
| Functional Safety Support | FuSa (Functional Safety) documentation |
| Programming Interface | UPDI (single-wire) |
| 工作温度 | -40C to +85C (industrial, A-grade suffix) |
| Packaging | Tape and Reel (R suffix) |
| 引脚数 | 32 |
| Peripherals | Core Independent Peripherals (CIPs): timers, USART, SPI, I2C, ADC |
ATMEGA808-AUR 32-tqfp (7x7 mm) 引脚配置指南
ATMEGA808-AUR（32-tqfp (7x7 mm) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： ATMEGA808-AUR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATMEGA808-AUR 适用于 6 应用s: Industrial Automation and Sensor Nodes, Home Appliances and White Goods, Battery-Powered Portable Devices, LED Lighting and Dimming Control, Motor Control (Small Fans, Pumps, Tools), IoT Edge Nodes and Wired Gateways.
Industrial Automation and Sensor Nodes
The ATMEGA808-AUR fits industrial sensor nodes and small automation endpoints because its -40C to +85C industrial temperature rating, 1.8V minimum supply and Core Independent Peripherals allow reliable unattended operation. The 20 MHz AVR core with hardware multiplier handles filtering and scaling math for ADC data, while timers and the USART/SPI/I2C peripherals stream measurements to a PLC or gateway. With 8 KB Flash and 1 KB SRAM, a Modbus or simple protocol slave plus calibration logic fits comfortably. Its 32-TQFP 7x7 mm footprint keeps node PCBs compact, and FuSa documentation support eases safety assessments in machinery subsystems.
推荐
Home Appliances and White Goods
In appliances such as fans, small pumps, coffee machines and cooker controls, the ATMEGA808-AUR provides the classic 8-bit MCU profile: low cost (about $1.09-$1.63 at 2026-09-18 distributor pricing), robust industrial temperature range, and enough 8 KB Flash for UI logic, relay sequencing and sensor monitoring. The hardware multiplier supports basic PID temperature loops, and Core Independent Peripherals keep PWM and timing running with minimal CPU load for responsive control. The 32-TQFP package provides sufficient GPIO for keys, LEDs and loads while remaining hand-solderable for service; Tape and Reel (-AUR) packaging suits high-volume SMT appliance assembly lines.
推荐
Battery-Powered Portable Devices
The ATMEGA808-AUR suits battery-powered products because the megaAVR 0-series is specified to operate down to 1.8V, allowing direct use of two alkaline cells or a single Li-ion cell through a simple regulator. With only 8 KB Flash and 1 KB SRAM, the part keeps active logic small, and peripherals can run without the CPU to minimize wake latency. Typical uses include portable meters, remote controls and tracking tags. Designers should use the datasheet power-management registers (sleep modes) to reach the lowest standby current, and note the 20 MHz full-speed rating applies at higher supply voltages per the frequency-voltage derating curve in datasheet DS40002172C.
推荐
LED Lighting and Dimming Control
For LED drivers and dimming controllers, the ATMEGA808-AUR offers multiple timers whose PWM outputs can drive MOSFET gate stages directly through Core Independent Peripherals, sustaining dimming without CPU intervention. The 20 MHz clock resolution supports flicker-free PWM frequencies above 1 kHz even at 8-bit resolution, and the hardware multiplier eases gamma-correction lookups. The 8 KB Flash stores dimming curves, DALI-style command handlers or touch-decision logic, while the industrial -40C to +85C rating suits enclosed luminaires. The 32-TQFP footprint with generous GPIO handles PWM, zero-cross detection and user interfaces on one chip.
推荐
Motor Control (Small Fans, Pumps, Tools)
The ATMEGA808-AUR supports basic brushed-DC and small BLDC motor control: its hardware multiplier accelerates PID and commutation math at 20 MHz, and timer PWM channels plus analog comparator peripherals form the core of a six-step or scalar control loop. The 1 KB SRAM accommodates control-state variables and fault logs, while 8 KB Flash holds the control firmware plus protection logic. For closed-loop sensorless FOC with heavy arithmetic, engineers should step up to a same-package, pin-compatible family member with more Flash. The industrial temperature rating and FuSa documentation support make it viable for power-tool and appliance safety reviews.
推荐
IoT Edge Nodes and Wired Gateways
As an IoT edge node front-end, the ATMEGA808-AUR collects sensor data over I2C/SPI and forwards it via USART to a wireless module or Ethernet gateway. Core Independent Peripherals let timers and communication interfaces service routine traffic without waking the CPU, reducing power in duty-cycled designs, while the 20 MHz AVR core preprocesses packets using its hardware multiplier for checksums and scaling. The 8 KB Flash and 1 KB SRAM fit a lightweight protocol handler; designs needing TLS or larger stacks should pair the MCU with a companion connectivity module rather than upgrading code space. The 32-TQFP package and UPDI interface simplify in-field reprogramming via a single-wire header.
推荐
推荐产品汇总
工程参考数据： ATMEGA808-AUR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ATMEGA1608-AUR | ATMEGA3208-AUR | ATMEGA4808-AUR |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 32-TQFP (7x7 mm) | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Minimum Operating Voltage | 1.8 V | 1.8 V | 1.8 V | 1.8 V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
关键差异点
- Lowest-cost 32-pin megaAVR 0-series member （对比 ATMEGA1608-AUR)
- Functional Safety (FuSa) documentation support （对比 ATMEGA808-AU (tray variant))
- Pin-compatible upgrade path within the same footprint （对比 ATMEGA4808-AUR)
设计说明
Reserve the single-wire UPDI interface (PA0) on a 3-pin header (UPDI, VDD, GND) on every ATMEGA808-AUR board. Unlike legacy AVR parts, the megaAVR 0-series uses UPDI for both programming and debugging, and losing access to this pin means the MCU cannot be reprogrammed in-system. A standard 1x3 2.54 mm header costs pennies and enables factory programming with tools such as Microchip's SNAP or the open-source pyupdi approach.
The ATMEGA808-AUR is specified to run down to 1.8V, but full 20 MHz operation is only valid within the frequency-versus-voltage derating curve in datasheet DS40002172C. If your design runs at 1.8-2.7V, reduce the clock accordingly or enable the internal oscillator scaling. Decouple each VDD pin with 100 nF ceramic capacitors placed within 2-3 mm of the pin, plus one bulk 4.7-10 uF capacitor near the supply entry. Verify brown-out detector settings for battery applications.
When substituting upward within the family (ATMEGA1608/3208/4808 in the same TQFP-32), the pinout and peripheral map are identical, but EEPROM sizes and Flash wait states differ - recompile and re-verify rather than flashing the same hex. Also note the 'R' suffix denotes Tape and Reel: if your contract manufacturer requires reel packaging for SMT lines, ordering the tray (-AU) variant will add handling steps. Confirm packaging code on purchase orders to avoid line-side shortages.
合规信息
Compliance status not stated in the provided verified web data. Microchip standard production parts are typically RoHS-compliant, but confirm via the official Microchip product page or Environmental datasheet before specifying.
