Continental Automotive Systems Corporation SKFGE04 Manual De Usuario
Editor :
KS.Kim
Document name
Project code
Version:
1.0
Feb. 21. 2018
ECO / DF No.
Identification No. : Document No.
File:
Page 4 / 8
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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 FOB),
• less sensitive for detuning compared to higher frequency.
• 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 FOB),
• less sensitive for detuning compared to higher frequency.
For the down-link from the SMART KEY FOB to the vehicle, the standard radio frequency
(RF) is used (similar to the classic remote control functions) with FSK modulation.
1.3
System Overview / Block Diagram
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
F