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Microchip公司的ATmega3208/3209/4808/4809是采用AVR?處理器的megaAVR? 0系列MCU，具有工作高達(dá)20MHz的硬件乘法器，以及高達(dá)48KB閃存儲(chǔ)器，6KB SRAM和256B EEPROM，采用最新的技術(shù)和靈活的低功率架構(gòu)，包括事件系統(tǒng)和SleepWalking，精密模擬特性和先進(jìn)的外設(shè)，采用28，32或48引腳封裝，主要用在工業(yè)，醫(yī)療，家庭自動(dòng)化和物聯(lián)網(wǎng)（IoT）應(yīng)用。本文介紹了ATmega3208/3209/4808/4809主要特性， 框圖以及開發(fā)板AVR-IoT WG主要特性，電路圖PCB設(shè)計(jì)圖和材料清單。
The ATmega3208/3209/4808/4809 microcontrollers of the megaAVR? 0-series are using the AVR?processor with hardware multiplier， running at up to 20 MHz， with a wide range of Flash sizes up to 48 KB， up to 6 KB of SRAM， and 256 bytes of EEPROM in 28-， 32-， or 48-pin package. The series uses the latest technologies from Microchip with a flexible and low-power architecture including Event System and SleepWalking， accurate analog features and advanced peripherals.
The devices described here offer Flash sizes from 32 KB to 48 KB in a 32-pin package.
ATmega3208/3209/4808/4809主要特性：
? AVR? CPU
– Single-cycle I/O access
– Two-level interrupt controller
– Two-cycle hardware multiplier
? Memories
– Up to 48 KB In-system self-programmable Flash memory
– 256B EEPROM
– Up to 6 KB SRAM
– Write/Erase endurance：
? Flash 10，000 cycles
? EEPROM 100，000 cycles
– Data retention： 20 Years at 85°C
? System
– Power-on Reset （POR） circuit
– Brown-out Detection （BOD）
– Clock options：
? 20 MHz low power internal oscillator with fuse-protected frequency setting
? 32.768 kHz Ultra Low Power （ULP） internal oscillator
? 32.768 kHz external crystal oscillator
? External clock input
– Single pin Unified Program Debug Interface （UPDI）
– Three sleep modes：
? Idle with all peripherals running and mode for immediate wake-up time
? Standby
– Configurable operation of selected peripherals
– SleepWalking peripherals
? Power Down with limited wake-up functionality
? Peripherals
– One 16-bit Timer/Counter type A with dedicated period register， three compare channels （TCA）
– Three 16-bit Timer/Counter type B with input capture （TCB）
– One 16-bit Real Time Counter （RTC） running from external crystal or internal RC oscillator
– Three USART with fractional baud rate generator， autobaud， and start-of-frame detection
– Master/slave Serial Peripheral Interface （SPI）
– Dual mode Master/Slave TWI with dual address match
? Standard mode （Sm， 100 kHz）
? Fast mode （Fm， 400 kHz）
? Fast mode plus （Fm+， 1 MHz）
– Event System for CPU independent and predictable inter-peripheral signaling
– Configurable Custom Logic （CCL） with up to four programmable Lookup Tables （LUT）
– One Analog Comparator （AC） with scalable reference input
– One 10-bit 150 ksps Analog to Digital Converter （ADC）
– Five selectable internal voltage references： 0.55V， 1.1V， 1.5V， 2.5V， and 4.3V
– CRC code memory scan hardware
? Optional automatic scan after reset
– Watchdog Timer （WDT） with Window Mode， with separate on-chip oscillator
– External interrupt on all general purpose pins
? I/O and Packages：
– 27 programmable I/O lines
– 32-pin VQFN 5x5 and TQFP 7x7
? Temperature Range： -40°C to 125°C
? Speed Grades：
– 0-5 MHz @ 1.8V – 5.5V
– 0-10 MHz @ 2.7V – 5.5V
– 0-20 MHz @ 4.5V – 5.5V， -40°C to 105°C
![[原創(chuàng)] Microchip ATmega3208系列MCU物聯(lián)網(wǎng)(IoT)解決方案](/uploads/allimg/181111/1242011Z4_0.png)
圖1. ATmega3208/3209/4808/4809框圖
開發(fā)板AVR-IoT WG
The AVR-IoT WG development board is a small and easily expandable demonstration and development platform for IoT solutions， based on the AVR? microcontroller architecture using Wi-Fi? technology. It was designed to demonstrate that the design of a typical IoT application can be simplified by partitioning the problem into three blocks：
? Smart - represented by the ATmega4808 microcontroller
? Secure - represented by the ATECC608A secure element
? Connected - represented by the WINC1510 Wi-Fi controller module
The AVR-IoT WG development board features a USB interface chip Nano Embedded Debugger （nEDBG） that provides access to a serial port interface （serial to USB bridge）， a mass storage interface for easy ‘drag and drop’ programming， configuration and full access to the AVR microcontroller UPDI interface for programming and debugging directly from Microchip MPLAB? X IDE and the Atmel? Studio 7.0 IDE. The AVR-IoT WG development board comes preprogrammed and configured for demonstrating connectivity
to the Google Cloud IoT Core.
開發(fā)板AVR-IoT WG 主要特性：
? A light sensor
? A high-accuracy temperature sensor - MCP9808
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