Continental Automotive 5NA920791A Immobilizer System User Manual 5NA 920 791 A USA Canadadocx

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Date Submitted	2016-11-17 00:00:00
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Document Title	User Manual_5NA.920.791.A_USA_Canadadocx
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User manual
Immobilizer System
Type 5NA.920.791.A
Keller, I ID S3 AD AE CO
Page 1
20.10.2016
Table of contents
System overview ........................................................................................................ 3
Transponder ............................................................................................................... 4
Power supply .............................................................................................................. 5
Technical data ............................................................................................................ 5
Label Information ........................................................................................................ 7
USA / Kanada: ............................................................................................................ 7
Owner Manual ............................................................................................................ 7
Owner Manual Canada .................................................................................................. 7
Owner Manual USA ....................................................................................................... 8
Keller, I ID S3 AD AE CO
Page 2
20.10.2016
1
System overview
The module described within this document is used in the following system environment:
VAG Immobilizer System WFS 5a
The VAG Immobilizer System WFS 5a is, among other things, an integral part of all MQB
instrument clusters.
An immobilizer distinguishes between authorized and unauthorized users and thus it prevents the
engine from running unless the correct key (transponder) is present.
The microcircuit inside the key is activated by a small electromagnetic field which induces current
to flow inside the key body, which in turn broadcasts a unique binary code which is read by the
instrument cluster that includes the immobilizer function. When the cluster determines that the
coded key is both current and valid, the ECU activates the fuel-injection sequence.
The immobilizer is an inductive application (Short Range Device), for this reason a radio approval
(homologation) is required.
All requirements refer to the specification “WFS 5a V1.9 Master” of the Volkswagen AG.
Keller, I ID S3 AD AE CO
Page 3
20.10.2016
2
Transponder
The used transponder (STXP AES) is a read/write RF transponder. It transmits Manchester
coded data to the transceiver by modulating the amplitude of the electromagnetic field and
receives data and commands in a similar way.
The transponder is supplied by carrier of an electromagnetic field induced on the attached coil.
The
AC
Figure 1: Principle of data transmission between transceiver and transponder
voltage is rectified in order to provide a DC internal supply voltage. When the DC voltage crosses
the Power-On level, the transponder will enter the Standby Mode and expects commands. In
Standby Mode a continuous sequence of Listen Windows (LIW) is generated. During this time,
the transponder will turn to the Receive Mode (RM) until it receives a valid RM pattern. The
transponder then expects a command to enter the desired mode of operation.
Features:
Battery-less 125 kHz crypt transponder functionality
True 32 bit identifier (Long ID)
Secret-Key in EEPROM (unreadable)
Free User Memory (UM)
Data transmission performed by amplitude modulation
Transmission rate for 125 kHz transponder communication: 4 kbauds
Special protected dataset storage intended for mileage counter
Lock-bits to inhibit programming
Operating temperature range -40 to +85°C
125 kHz field frequency
On chip rectifier and voltage limiter
Security Transponder
STXP AES
(AES-MEGACRYPT)
Security Transponder Chip
Contactless Interface
Basestation
Rectifier Voltage
Limiter
Energy
Analog Circuit
Modulator
LTXP
write
to µ C
CTXP
Control Logic
Clock Recovery
read
Serial Interface
EEPROM
1.25 kByte
fRES = 125 kHz (typ.)
Inductive Link
f SYS = 125 kHz (typ.)
Demodulator
LF Field
Power On Reset
LRES B2
Calculation
Unit
(Crypto Algorithm)
Keller, I ID S3 AD AE CO
Page 4
20.10.2016
3
Power supply
Because ANT drivers drive antenna with VDD and VSS power supply levels all variations and
noise in power supply are directly fed to antenna resonant circuit. Any supply voltage fluctuations
or ripple are transferred into antenna current fluctuations by the antenna driver transistors. This is
equal to a current modulation that results in a voltage modulation at the antenna tap point. There
is no possibility for the demodulator to distinguish this modulation from the transponder
modulation (transponder signal superimposed on antenna voltage is in the range of tens of mV).
Especially in the passband of the demodulator filters (<10 kHz), the system is very sensitive
against supply hum and ripple.
For this reason a separate linear voltage regulator is used for the immobilizer circuit. The Enable
pin of this regulator is controlled by the microcontroller. The regulator is only enabled during
transponder communication.
KL30 Voltage for guaranteed immobilizer function and performance:
Minimum Operating Voltage = 6.5V
Nominal Operating Voltage = 13.5V
Maximum Operating Voltage = 17.0V
Technical data
Parameter
Supply
Supply Voltage Immobilizer
Module
Supply Voltage LRES B2
Current consumption
INHIBIT OFF
Supply current in Sleep
Mode (Quiescent current)
Supply current excluding
drivers current in Normal
Mode
Power on reset level
AGND level
µC interface
Input logic high
Input logic low
Input leakage current
L/Z_OUT sink current
L/Z_OUT output logic low
Environment requirements
Ambient temperature
Junction temperature
Package thermal resistor
Symbol
Min
Typ
Max
Unit
VKL30
6.5
13.5
17.0
VDD
4.5
5.0
5.5
IQ
10
µA
VINH = 0 V;
Full temp. range
IDDsleep
40
µA
Full temp. range
10
mA
2.5
3.6
2.65
Full temp. range
Full temp. range
0.2 VDD
+1
2.5
0.4
µA
mA
Full temp. range
Full temp. range
Full temp. range
+85
+110
71
°C
°C
°C/W
IDDon
Vpor
VAGND
1.4
2.35
VIH
VIL
IL
0.8 VDD
-1
IL/Z_OUT
VL/Z_OUT
TA
TJ
Rth
-40
-40
69
70
Conditions
Antenna circuit
Keller, I ID S3 AD AE CO
Page 5
20.10.2016
Carrier frequency
Resonant frequency
fANT
fRES
120
125
125
130
kHz
kHz
Antenna voltage
VCoil2
55
75
95
Vpp
Antenna current (RMS)
Vsense
30
34
38
mA
Oscillator
Oscillator frequency
Antenna drivers
Output resistance
AM demodulation
Input sensitivity
Signal on DEMOD_IN with
no transitions on
DEMOD_OUT
DEMOD_IN common mode
range
DEMOD_IN input resistance
to AGND
Keller, I ID S3 AD AE CO
LCoil = 1.041mH ± 5%,
QCoil = 8.55 ± 15%
LCoil = 1.041mH ± 5%,
QCoil = 8.55 ± 15%
fOSC
RADout
Ω
Ω
IA1=10mA
IA1=100mA
Full temp. range
Vsense
0.85
1.42
mVpp
Full temp. range
140
µVpp
VDD
- 0.5
260
400
VSN
VCM
RDI
VSS
+ 0.5
140
100
Page 6
200
MHz
kΩ
kΩ
Full temp. range
20.10.2016
5
Label Information
Europa:
Continental
5NA.920.791.A
USA / Kanada:
Continental
Model: 5NA.920.791.A
FCC ID:KR55NA920791A
IC:7812D-5NA920791A
Owner Manual
Owner Manual Canada
IC:7812D-5NA920791A
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation.
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux
appareils radio exempts de licence. L'exploitation est autorisée aux deux
conditions suivantes :
(1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit
accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible
d'en compromettre le fonctionnement.
Keller, I ID S3 AD AE CO
Page 7
20.10.2016
Owner Manual USA
FCC ID:KR55NA920791A
This device complies with Part 15 of the FCC Rules. Operation is subject
to the following two conditions:
(1) this device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation.
Changes or modifications not expressly approved by the party responsible
for compliance could void the user's authority to operate the equipment.
Keller, I ID S3 AD AE CO
Page 8
20.10.2016

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