Continental Automotive Systems Corporation HICFGE00 Manual De Usuario

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Editor : 
BH.Lee 
Document name 
Project code 
Version: 
1.0 
Nov. 08. 2012 
ECO / DF No.
Identification No. : Document No. 
File:  
Page 4 / 6 
.
ropri
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ar
  
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 c
om
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 c
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ident
ial
   
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ll 
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ight
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om
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os
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 V
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 und 
 
M
itt
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ihr
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Inhal
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 ni
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  au
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a
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ert
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ilung oder GM
-E
in
tr
agung
Technical aspects of 125 kHz – magnetic field: 
virtually no reflections,
cubical decrease of field strength 
 allows good range control,
released frequency band (ISM),
high 
penetration,
low quiescent current demand due to 125 kHz input stage (SMART KEY CARDKEY),
less sensitive for detuning compared to higher frequency.
For the down-link from the SMART KEY CARDKEY to the vehicle, the standard radio
frequency (RF) is used (similar to the classic remote control functions) with FSK
modulation.
1.3 System 
Overview 
Figure 1: Principle of Communication 
ECU sends LF challenge via exterior antenna 
ID tag sends identification code to RF receiver
Doors are unlocked automatically 
User pulls open the door 
L
F