User's Manual

Editor :

KS.Kim

Document name

Project code

Version:

1.0

Sep. 20. 2019

ECO / DF No.

Identification No. : Document No.

File:

Page 4 / 9

Proprietary data, com

Com

unicado como segredo em

presarial. Reservados todos os direitos.

Confidado com

o secreto industrial. Nos reservamos todos los derechos.

eitergabe sowie Vervielfältigung dieser Unterlage, Ver-

wertung und M

itteilung ihres Inhalts nicht gestattet, soweit

nicht ausdrücklich zugestanden. Zuwiderhandlungen ver-

sondere für den Fall der Patenterteilung oder GM

-Eintragung.

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.

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