Indice Date Status Evolutions A0 08/01/07 Creation establishment OPERATIONAL DESCRIPTION HOM-RF-07-0011-LDL Rfrence primaire A0 Ind. Description :
This document describes the operational description Nom du fichier : OpDes.odt Frdric AUBINEAU Philippe LEFAURE Philippe LEFAURE Control ZNGA 08/01/07 Approbation 08/01/07 Writer 08/01/07 Name Date Visa Data included cannot be used, copied or transmitted without written permission. This document is LDL-Technology's property. page 1 / 4 HOM-RF-07-0011-LDL Ind. A0 OPERATIONAL DESCRIPTION Contents 1 Object.............................................................................................................................................................. 3 2 Documents....................................................................................................................................................... 3 2.1 Applicable documents ............................................................................................................................. 3 2.2 Reference documents.............................................................................................................................. 3 2.3 Terminology & abbreviations.................................................................................................................... 3 2.3.1 Terminology..................................................................................................................................... 3 2.3.2 Abbreviations................................................................................................................................... 3 3 DESCRIPTION OF THE RF TRANSMITTER.................................................................................................. 4 4 POWER SUPPLY............................................................................................................................................ 4 5 TRANSMISSION FORMAT.............................................................................................................................. 4 6 OSCILLATOR.................................................................................................................................................. 4 7 DATA OF THE TRANSMITTER....................................................................................................................... 4 Data included cannot be used, copied or transmitted without written permission. This document is LDL-Technology's property. page 2 / 4 HOM-RF-07-0011-LDL Ind. A0 OPERATIONAL DESCRIPTION index Primary Reference Title referenced User Doc.
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index Primary Reference Title Referenced User 1 OBJECT This document describes the operational description 2 DOCUMENTS 2.1 Applicable documents
[DA1]
[DA2]
[DA3]
[DR1]
2.2 Reference documents 2.3 Terminology & abbreviations 2.3.1 Terminology Not relevant. 2.3.2 Abbreviations WUS DAC RF FSK C PCB DSP Wheel Unit Sensor Digital analog converter Radio Frequency Frequency shift keying Micro Controleur Printed Circuit Boards Display Data included cannot be used, copied or transmitted without written permission. This document is LDL-Technology's property. page 3 / 4 HOM-RF-07-0011-LDL Ind. A0 OPERATIONAL DESCRIPTION 3 DESCRIPTION OF THE RF TRANSMITTER The pressure and temperature information are transmitted by the WUS. The transmitter is a single chip. It contains a fully integrated PLL synthesizer and a high efficiency power amplifier to drive an antenna. 4 POWER SUPPLY 5 TRANSMISSION FORMAT 6 OSCILLATOR The transmitter is power supplied by a +3V Lithium battery (CR2450). The power of the batteries is checked for each transmitted telegram. The low tension detection is determined by an integrated DAC within the microcontroller. The battery inversion is protected mechanically. The telegram is Manchester coded. The RF code telegram changes with every new transmission. The transmission rate is tuned to 9,6 kBaud. The PLL is stabilised by a Quartz. The frequency is 315 MHz +/-100ppm 7 DATA OF THE TRANSMITTER Type : Manchester code Bit duration is 104 s, Tx rate is 9,6 kbaud. 104 s 104s 8 MESSAGE STRUCTURE The message is transmitted every minute 14 ms 14 ms 14 ms
~120 ms
~ 160 ms Frame #1 (FSK) Frame #2 (FSK) Frame #3 (FSK) Data included cannot be used, copied or transmitted without written permission. This document is LDL-Technology's property. page 4 / 4