Continental Automotive Systems Corporation HICFGE00 Manual De Usuario
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
et
ar
y
dat
a,
c
om
p
any
c
onf
ident
ial
.
A
ll
r
ight
s
res
er
ve
d.
onf
ié
à
t
itr
e
de
s
ec
ret
d'
e
nt
repr
is
e.
T
ous
dr
oi
ts
rés
er
vés
.
om
u
ni
c
a
do
c
om
o
segr
edo
em
pr
es
a
ri
al
.
R
es
er
vados
t
odos
os
di
rei
tos
.
onf
idado
com
o s
ec
ret
o
in
dus
tr
ial
.
N
os
res
er
v
am
os
t
odos
l
os
derec
ho
s.
.
W
e
iterga
be s
o
w
ie V
er
vi
e
lfäl
tigung di
es
er U
n
te
rl
ag
e,
V
e
r-
w
ert
ung
und
M
itt
ei
lung
ihr
es
Inhal
ts
ni
cht
ges
ta
ttet
, s
o
w
ei
t
ni
cht
au
sdr
üc
kl
ic
h
z
uges
tand
en.
Z
uw
ider
handl
un
gen
v
er
-
pf
lic
h
ten
zu S
chadeners
at
z.
A
lle
R
ec
ht
e v
orbehal
te
n
,
ins
be
-
sondere
fü
r den F
a
ll der
a
te
nt
ert
e
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.
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
F