原标题：Silabs EFR32MG1 ZigBee智能插座参考设计

　　Silabs公司的EFR32MG1是Wireless Gecko系列系统级芯片(SoC),基于32位 ARM® Cortex®-M4核,工作频率40MHz,集成了2.4GHz平衡/不平衡变换器,2.4GHz发送功率高达19.5dBm的功率放大器(PA)以及次GHz 20dBm发送功率的无线电.主要用在家庭连接,照明,健康和医疗,计量以及家庭和建筑物自动化与安全.本文介绍了EFR32MG1主要特性和亮点,框图,以及ZigBee智能插座RD-0051-0201参考设计主要特性,采用智能插座的ZigBee家庭自动化示意图,智能插座RD-0051-0201部件IST-A0074,IST-A0075和IST-A0081电路图,材料清单和PCB设计图.

　　The Mighty Gecko ZigBee & Thread family of SoCs is part of theWireless Gecko portfolio. Mighty Gecko SoCs are ideal for enablingenergy-friendly ZigBee & Thread networking for IoT devices.

　　The single-die solution provides industry-leading energy efficiency, ultra-fast wakeuptimes, a scalable power amplifier, an integrated balun and no-compromise MCU features.

　　Mighty Gecko applications include:

　　• Connected Home

　　• Lighting

　　• Health and Wellness

　　• Metering

　　• Home and Building Automation and Security

　　EFR32MG1主要亮点:

　　• 32-bit ARM® Cortex®-M4 core with 40MHz maximum operating frequency

　　• Scalable Memory and Radio configurationoptions available in several footprintcompatible QFN packages

　　• 12-channel Peripheral Reflex Systemenabling autonomous interaction of MCUperipherals

　　• Autonomous Hardware Crypto Acceleratorand Random Number Generator

　　• Integrated balun for 2.4 GHz andintegrated PA with up to 19.5 dBmtransmit power for 2.4 GHz and 20 dBmtransmit power for Sub-GHz radios

　　• Integrated DC-DC with RF noise mitigation

　　图1. EFR32MG1框图

　　EFR32MG1主要特性:

　　• Low Power Wireless System-on-Chip.

　　• High Performance 32-bit 40 MHz ARM Cortex®-M4 withDSP instruction and floating-point unit for efficient signalprocessing

　　• Up to 256 kB flash program memory

　　• Up to 32 kB RAM data memory

　　• 2.4 GHz and Sub-GHz radio operation

　　• Transmit power:

　　• 2.4 GHz radio: Up to 19.5 dBm

　　• Sub-GHz radio: Up to 20 dBm

　　• Low Energy Consumption

　　• 8.7 mA RX current at 2.4 GHz

　　• 8.2 mA TX current @ 0 dBm output power at 2.4 GHz

　　• 8.1 mA RX current at 868 MHz

　　• 34.5 mA TX current @ 14 dBm output power at 868 MHz

　　• 63 μA/MHz in Active Mode (EM0)

　　• 1.4 μA EM2 DeepSleep current (full RAM retention andRTCC running from LFXO)

　　• 0.58 μA EM4H Hibernate Mode (128 byte RAM retention)

　　• Wake on Radio with signal strength detection, preamblepattern detection, frame detection and timeout

　　• High Receiver Performance

　　• -94 dBm sensitivity @ 1 Mbit/s GFSK (2.4GHz)

　　• -121.4 dBm sensitivity at 2.4 kbps GFSK (868 MHz)

　　• Supported Modulation Formats

　　• 2-FSK / 4-FSK with fully configurable shaping

　　• Shaped OQPSK / (G)MSK

　　• Configurable DSSS and FEC

　　• BPSK / DBPSK TX

　　• OOK / ASK

　　• Supported Protocols:

　　• Proprietary Protocols

　　• Wireless M-Bus

　　• Low Power Wide Area Networks

　　• Support for Internet Security

　　• General Purpose CRC

　　• Random Number Generation

　　• Hardware Cryptographic Acceleration for AES 128/256,SHA-1, SHA-2 (SHA-224 and SHA-256) and ECC

　　• Wide selection of MCU peripherals

　　• 12-bit 1 Msps SAR Analog to Digital Converter (ADC)

　　• 2× Analog Comparator (ACMP)

　　• Digital to Analog Current Converter (IDAC)

　　• Up to 31 pins connected to analog channels (APORT)shared between Analog Comparators, ADC, and IDAC

　　• Up to 31 General Purpose I/O pins with output state retentionand asynchronous interrupts

　　• 8 Channel DMA Controller

　　• 12 Channel Peripheral Reflex System (PRS)

　　• 2×16-bit Timer/Counter

　　• 3 + 4 Compare/Capture/PWM channels

　　• 32-bit Real Time Counter and Calendar

　　• 16-bit Low Energy Timer for waveform generation

　　• 32-bit Ultra Low Energy Timer/Counter for periodic wake-upfrom any Energy Mode

　　• 16-bit Pulse Counter with asynchronous operation

　　• Watchdog Timer with dedicated RC oscillator @ 50nA

　　• 2×Universal Synchronous/Asynchronous Receiver/Transmitter(UART/SPI/SmartCard (ISO 7816)/IrDA/I2S)

　　• Low Energy UART (LEUART™)

　　• I2C interface with SMBus support and address recognitionin EM3 Stop

　　• Wide Operating Range

　　• 1.85 V to 3.8 V single power supply

　　• Integrated DC-DC, down to 1.8 V output with up to 200 mAload current for system

　　• -40 °C to 85 °C

　　• QFN32 5x5 mm Package

　　• QFN48 7x7 mm Package

　　图2.EFR32MG1详细框图

　　There is an increasing desire in the market for a standards-driven, low-cost, and low-power wireless home automation system. Formany entrant systems a smart outlet is usually employed to remotely activate and deactivate the source power feeding into room

　　lamps, personal fans, and consumer electronics. In addition to home automation, consumers are employing an array of low-cost sensorsto further enhance their home automation’s autonomous behavior. Silicon Labs has developed a compact and cost-effective smartoutlet reference design targeted at these applications. This reference design (see the following figure) features Silicon Labs’EFR32MG1P232F256GM48 ZigBee Pro Wireless Microcontroller (MCU), the Si7021 temperature and relative humidity sensor. and theSi1141 ambient light sensor. The outlet also features voltage, current, and power measurement capability, as well as current and thermaloverload shutdown features. The reference design can be directly integrated into a connected ZigBee home automation application. The reference design comes preprogrammedand fully functional out of the box. All hardware design files and firmware application source code are available.

　　The Smart Outlet reference design kit provides the quickest path to a next generation wireless product. It addresses the major challenges of a wireless outlet design – the power distribution and safety design, the rigorous challenges of wireless networking, and the electronic certifications. It features a robust load capacity of 15 Amps and also features the Silicon Labs ZigBee stack, so it is proven to scale with the most demanding building automation systems. The software is implemented on the ARM® Cortex-M4, Mighty Gecko SoC, providing an upgrade path for dual-protocol or changing protocols altogether.

　　With this kit you also get Silicon Labs’ software with example applications, documentation, and other resources to get started with your own development.

　　图3.EFR32MG1 ZigBee智能插座RD-0051-0201外形图

　　ZigBee智能插座RD-0051-0201参考设计

　　The smart outlet reference design is a complete, pre-certified solution for a wirelessly controlled outlet plug that can be used to power and control a wide range of home and building automation products. Powered by an ac main-voltage line, the smart outlet communicates wirelessly to ZigBee mesh networks. The smart outlet design includes the following features:

　　Built-in diagnostics and metering with a user-friendly web interface for wireless control and current/voltage monitoring, easily accessible from mobile devices

　　A wide ac voltage range (110-240 V) for global use along with a robust 15 A load current

　　Integrated high-accuracy sensors: ambient light and temperature/humidity

　　Compact design: 6.5 cm x 6.5 cm x 4.0 cm

　　Both reference designs include Silicon Labs’ EFR32MG Mighty GeckoSoC, providing industry-leading multiprotocol wireless connectivity for home and building automation. The Mighty Gecko SoC’s energy-efficient architecture combines a high-performance ARM® Cortex®-M4 processor with a 2.4 GHz transceiver featuring an integrated power amplifier and balun and capable of +19.5 dBm output power for exceptional low-power wireless range.

　　ZigBee智能插座RD-0051-0201参考设计主要特性:

　　• Silicon Labs EFR32MG1P232F256GM48 ZigBee Pro Radio:

　　• 32-bit ARM® Cortex -M4 with DSP and FPU

　　• 2.4-GHz IEEE 802.15.4-2003 transceiver & lower MAC.

　　• Hardware Cryptographic Acceleration for AES 128/256, SHA-1, SHA-2 (SHA-224 and SHA-256) and ECC.

　　• 256 kB user programmable flash with 64 kB RAM.

　　• Flexible ADC, UART/SPI/I2C serial communications, and general purpose timers.

　　• Highly efficient Thumb-2 instruction set.

　　• Silicon Labs Si7021 relative humidity and temperature sensor:

　　• Temperature sensor accuracy: ±0.4 °C

　　• Humidity sensor accuracy: ±3% RH

　　• I2C interface

　　• Silicon Labs Si1141 ambient light sensor:

　　• Ambient light sensor range: 1 to 128 kilo lux

　　• I2C interface

　　• Additional hardware features:

　　• Integrated PCB antenna.

　　• Energy monitoring device

　　• Full packet trace port for RF communications debugging.

　　• Pushbutton for manual on-off power and network join.

　　• Green Network/status LED.

　　• Red power status LED.

　　• Fully qualified BOM for 0 to 55 ºC operation.

　　• Pre-certified FCC Part 15.

　　• Pre-certified UL.

　　图4.采用智能插座的ZigBee家庭自动化示意图　　详情请见:

ug171-zigbee-smart-outlet-rd-0051.pdf

EFR32MG1-DataSheet.pdf