Silicon Laboratories C8051F342 Manuel d'utilisateur

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Rev. 0.1 12/09 Copyright © 2009 by Silicon Laboratories RF-to-USB-RD
RF-to-USB-RD
RF TO USB REFERENCE DESIGN USERS GUIDE
1. Kit Contents
The RF to USB Reference Design contains the following items:
EZRadioPRO
®
F912/4431 Sensor Node
EZRadioPRO
®
F342/4431 Dongle
AAA Battery
2. Introduction
The purpose of this reference design is to demonstrate a very low-power, wireless USB system. The system
consists of two components: a wireless Sensor Node and a USB Dongle. The Sensor Node uses a Silicon Labs
C8051F912 MCU and a Silicon Labs Si4431 radio. The Dongle uses a Silicon Labs C8051F342 MCU and a Silicon
Labs Si4431 radio.
The reference design includes two demo applications which implement some typical usage scenarios. The RF to
USB Network Demo shows how the Sensor Node can be used as a wireless sensor, periodically transmitting
remote sensor data back to the host PC. The RF to USB UART Demo shows how the Sensor Node can be used as
a wireless link, shuttling data between two systems.
The wireless Sensor Node and the USB Dongle are small, simple designs and easy to implement, enabling them to
be inexpensively and quickly added to any system that requires wireless capability. There are very few components
required other than the MCU and radio, and typically expensive components such as a wired antenna and external
voltage regulator are not required.
The wireless Sensor Node operates at 915 MHz and is powered by a single AAA battery and uses the on-chip dc-
dc converter of the C8051F912 to provide power for the EZRadioPRO
®
radio and the other components. When the
wireless Sensor Node is not transmitting or receiving data, it can remain in a low-power state where it only
consumes 50 nA. The power efficiency of the Sensor Node allows it to operate on a single cell battery for an
extended period of time. The estimated battery life is seven years, limited primarily by the self-discharge of the
battery.
Figure 1. System Diagram
Network
Dongle
App
UART
Dongle
App
HID
Bootloader
UART
Demo
GUI
Network
Demo
GUI
App
Firmware
Image
Network
Node
App
UART
Node
App
EZRadioPRO EZRadioPRO
Node
Dongle
PC
USB
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Résumé du contenu

Page 1 - RF-to-USB-RD

Rev. 0.1 12/09 Copyright © 2009 by Silicon Laboratories RF-to-USB-RDRF-to-USB-RDRF TO USB REFERENCE DESIGN USER’S GUIDE1. Kit ContentsThe RF to USB R

Page 2

RF-to-USB-RD10 Rev. 0.1Figure 9. EZRadioPRO® F912/4431 Sensor Node Schematic Page 1

Page 3

RF-to-USB-RDRev. 0.1 11Figure 10. EZRadioPRO® F912/4431 Sensor Node Schematic Page 2

Page 4

RF-to-USB-RD12 Rev. 0.1Figure 11. EZRadioPRO® F342/4431 Dongle Schematic

Page 5

RF-to-USB-RDRev. 0.1 13NOTES:

Page 6

RF-to-USB-RD14 Rev. 0.1CONTACT INFORMATIONSilicon Laboratories Inc.400 West Cesar ChavezAustin, TX 78701Tel: 1+(512) 416-8500Fax: 1+(512) 416-9669Toll

Page 7

RF-to-USB-RD2 Rev. 0.13. Hardware Overview and SetupFigure 2 and Figure 3 identify the major components of the Sensor Node and the USB Dongle. Both d

Page 8

RF-to-USB-RDRev. 0.1 34. Software SetupThere are two applications for use with this reference design: the Network Demo and the UART Demo. The demoapp

Page 9

RF-to-USB-RD4 Rev. 0.1Figure 4. RF to USB Network Demo Application Initial Screen5. Insert the AAA battery. If the battery has already been installed,

Page 10

RF-to-USB-RDRev. 0.1 5Figure 5. RF to USB Network Demo Application During CommunicationWhen the button on the Sensor Node is pressed to initiate commu

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RF-to-USB-RD6 Rev. 0.16. RF to USB UART DemoThe RF to USB UART Demo shows how a Sensor Node can be used as a wireless link to transmit data betweentw

Page 12

RF-to-USB-RDRev. 0.1 7Figure 7. RF to USB UART Demo Application Initial Screen5. Type an ASCII string in the Transmit text box and click on the Transm

Page 13

RF-to-USB-RD8 Rev. 0.1Figure 8. RF to USB UART Demo Application During CommunicationWhen the Sensor Node receives any UART data on the RX pin, it will

Page 14

RF-to-USB-RDRev. 0.1 97. Additional InformationThe RF to USB RD uses a 915 MHz RF link. The demo firmware is written on top of EZMAC® PRO. The RF lin

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