Continental Automotive 17A920790 VAG Immobilizer Sytem User Manual

Continental Automotive GmbH VAG Immobilizer Sytem

user manual

Keller, I ID S3 AD AE 1 Page 1 23.10.2017 User manual VAG Immobilizer System Type 17A 920 790
Keller, I ID S3 AD AE 1 Page 2 23.10.2017 Table of contents 1 System overview………………………………………………………………………...3 2 Short description of the module………………………………………………………..3 3 Transponder……………………………………………………………………………...4 4 Power supply……………………………………………………………………………..5 5 Technical data……………………………………………………………………………5 6 Label………………………………………………………………………………………6
Keller, I ID S3 AD AE 1 Page 3 23.10.2017 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. 2 Short description of the module This document describes a car immobilizer circuit based on base station IC LRES B2, which is distributed by Delphi Megamos. This module performs the following functions:  Antenna driving with carrier frequency  100% AM modulation of the field for writeable transponders (write mode)  AM/FM demodulation of the antenna signal modulation induced by the transponder (read mode)  Communication with microcontroller via two wire interface The immobilizer module is the interface between the transponder inside the key and the microcontroller. The microcontroller controls all functions of the instrument cluster including the transponder communication. The reader and the transponder are working as a wireless, magnetic coupled communication system, each with a resonance circuit tuned to the system frequency as close as possible. Both circuits have to be tuned on the resonance frequency (125 ± 5 kHz). The reader circuit is working in series resonance, the transponder with a parallel resonance circuit. The reader provides energy to the transponder by an electromagnetic field. By modulating this field, the reader can transmit (write) data to the transponder (uplink). The transponder will power up and return its on-chip data to the reader (downlink).
Keller, I ID S3 AD AE 1 Page 4 23.10.2017 The microprocessor interface (µPI) connects the analog front end (AFE) with the microcontroller. The communication between transceiver and microcontroller is made via two wires (L/Z_IN and L/Z_OUT). L/Z_IN is the data input of LRES B2, L/Z_OUT is an open drain output which is also used as input. In read mode (observing the messages sent by the transponder) the L/Z_OUT pin provides a digital asynchronous signal coming from demodulator chain. In write mode, the L_EN signal defines the operation of the microprocessor interface:  When L_EN is high (Master Mode) µPI synchronizes to transponder listening window and provides on L/Z_OUT pin the bit clock for data which will be sent to transponder via L/Z_IN pin.  When L_EN pin is low (Slave Mode) microprocessor itself controls the communication with the transponder. L/Z_IN pin is directly controlling internal signal MOD. Signal MOD is directly controlling the antenna drivers. When it is high the drivers are off. In this module, L_EN is not connected to the micro controller, pin is pulled up to the 5V supply voltage of the immobilizer circuit. This means that the Master Mode is used exclusively. The oscillator of base station IC is designed for usage of a 4 MHz resonator. Timer part divides the 4 MHz clock signal down to a 125 kHz signal for antenna drivers and µP interface and provides some additional synchronization signals for receiver chain, sampler and short circuit detector. 3 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 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 Figure 1: Principle of data transmission between transceiver and transponder
Keller, I ID S3 AD AE 1 Page 5 23.10.2017  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 4 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 pass band 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 5 Technical data Parameter Symbol Min Typ Max Unit Conditions Supply Supply Voltage Immobilizer Module VKL30 6,5 13,5 17,0 V Supply Voltage LRES B2 VDD 4,5 5,0 5,5 V Current consumption INHIBIT OFF IQ 10 A VINH = 0 V; Full temp. range Supply current in Sleep Mode (Quiescent current) IDDsleep 40 A Full temp. range Supply current excluding drivers current in Normal Mode IDDon 5 10 mA Power on reset level Vpor 1,4 3,6 V Full temp. range
Keller, I ID S3 AD AE 1 Page 6 23.10.2017 AGND level VAGND 2,35 2,5 2,65 V Full temp. range C interface Input logic high VIH 0,8 VDD V Full temp. range Input logic low VIL 0,2 VDD V Full temp. range Input leakage current IL -1 +1 A Full temp. range L/Z_OUT sink current IL/Z_OUT 2,5 mA L/Z_OUT output logic low VL/Z_OUT 0,4 V Environment requirements Ambient temperature TA -40 +85 °C Junction temperature TJ -40 +110 °C Package thermal resistor Rth 69 70 71 °C/W Antenna circuit Carrier frequency fANT 125 kHz Resonant frequency fRES 120 125 130 kHz Antenna voltage VCoil2 55 75 95 Vpp LCoil = 1.041mH ± 5%, QCoil = 8.55 ± 15% Antenna current (RMS) Vsense 30 34 38 mA LCoil = 1.041mH ± 5%, QCoil = 8.55 ± 15% Oscillator Oscillator frequency fOSC 4 MHz Antenna drivers Output resistance RADout 3 6 Ω IA1=10mA 9 Ω IA1=100mA Full temp. range AM demodulation Input sensitivity Vsense 0,85 1,42 mVpp Full temp. range Signal on DEMOD_IN with no transitions on DEMOD_OUT VSN 140 Vpp DEMOD_IN common mode range VCM VSS + 0,5 VDD - 0,5 V DEMOD_IN input resistance to AGND RDI 140 200 260 kΩ Full temp. range 100 400 kΩ
Keller, I ID S3 AD AE 1 Page 7 23.10.2017 6 Label Information USA and Canada United States (US) 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. Products, which include above-mentioned module, have been approved by the Certification process. They must have a label showing the FCC ID number: Continental 17A920790 FCC ID:KR517A920790 CANADA This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. Products, which include above-mentioned module, have been approved by the certification process. They must have a label a label showing the IC ID number: IC:7812D-17A920790 The HVIN (Hardware Version Identification Number) identifies hardware specifications of a product version. The HVIN replaces the ISED Model Number in the legacy E-filing System. An HVIN is required for all products for certification applications. HVIN: 5a
Keller, I ID S3 AD AE 1 Page 8 23.10.2017 Owner Manual: 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.

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