Silicon Laboratories C8051F342 User Manual

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Rev. 0.2 5/11 Copyright © 2011 by Silicon Laboratories AN588
AN588
ENERGY HARVESTING REFERENCE DESIGN USERS GUIDE
1. Kit Contents
The RF to USB Reference Design contains the following items:
Si1012 Energy Harvesting Wireless Sensor Node
EZRadioPRO
®
USB Dongle
ToolStick Base Adapter
3-foot USB extension cable
2. Introduction
The purpose of this reference design is to demonstrate an ultra low power wireless sensor, powered from an
energy harvesting source. This application is typical of systems which wake periodically to measure and transmit
results. Since it is powered from an energy harvesting source, no batteries need to be replaced for the life of the
system (life expectancy is greater than 15 years or 7000 mA-H) and the wireless node can be designed with a very
thin profile (battery height is 0.17 mm). The system consists of two components: a wireless Sensor node and an
EZRadioPRO
®
USB Dongle. The Sensor Node uses a Silicon Labs Si1012 wireless MCU. The Dongle uses a
Silicon Labs C8051F342 MCU and a Silicon Labs Si4431 radio.
The Sensor Node operates at 919.84 MHz and is powered by a solar energy harvesting power supply. When the
wireless Sensor Node is not transmitting data, the Si1012 wireless MCU can remain in a low-power state where it
only consumes 50 nA. The leakage current of the energy harvesting supply, when enabled, is approximately 3 µA
and is cancelled out by as little as 50 lux shining into the solar cell. This allows the energy harvesting supply to
power the system for approximately 7 days in a dark closet (in the ON position) or indefinitely if there is a periodic
light source that replenishes the lost energy. The system works both in indoor lighting (200 lx) and outdoor lighting
(10,000 lx) conditions.
Figure 1. Energy Harvesting Sensor Node
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Summary of Contents

Page 1 - 2. Introduction

Rev. 0.2 5/11 Copyright © 2011 by Silicon Laboratories AN588AN588ENERGY HARVESTING REFERENCE DESIGN USER’S GUIDE1. Kit ContentsThe RF to USB Referenc

Page 2 - 3. Hardware Overview

AN58810 Rev. 0.2Figure 12. Energy Harvesting Node Schematic (2 of 3)

Page 3 - 4. Software Setup

AN588Rev. 0.2 11Figure 13. Energy Harvesting Node Schematic (3 of 3)

Page 4 - 4 Rev. 0.2

AN58812 Rev. 0.2CONTACT INFORMATIONSilicon Laboratories Inc.400 West Cesar ChavezAustin, TX 78701Tel: 1+(512) 416-8500Fax: 1+(512) 416-9669Toll Free:

Page 5 - Rev. 0.2 5

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Silicon Laboratories: ENER

Page 6 - 6. Energy Harvesting System

AN5882 Rev. 0.23. Hardware Overview Figure 2 and Figure 3 identify the major components of the Sensor Node and the USB Dongle. Both devices comeprelo

Page 7 - Rev. 0.2 7

AN588Rev. 0.2 34. Software SetupThe Energy Harvesting demo application is designed for the Windows operating systems and is distributed as partWirele

Page 8 - 8. Additional Information

AN5884 Rev. 0.26. On the Sensor Node, press the button. This will wake the MCU from sleep mode. The first time the button is pressed the Sensor Node w

Page 9 - 9. Schematic

AN588Rev. 0.2 5Figure 6. Energy Harvesting Demo (Packet View)10.On the Packet tab, a list of all received packets is displayed. Selecting a packet wil

Page 10 - 10 Rev. 0.2

AN5886 Rev. 0.26. Energy Harvesting SystemThe energy harvesting system used in this reference design, shown in Figure 8, consists of three components

Page 11 - Rev. 0.2 11

AN588Rev. 0.2 77. Ultra Low Power Wireless SensorThe Si1012 Wireless MCU is used for the sensing and RF transmission functions of this reference desi

Page 12 - CONTACT INFORMATION

AN5888 Rev. 0.28. Additional InformationIf the power select switch is in the SOLAR position and the Energy Harvesting Node Board is exposed to at lea

Page 13 - ENERGY-HARVEST-RD

AN588Rev. 0.2 99. SchematicFigure 11. Energy Harvesting Node Schematic (1 of 3)

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