Automotive User manual / Functional description for Continental - MERCEDES BENZ RF - remote control transmitter FBS 2b 315 MHz Olaf Stranghner Technology, Manager Spare Parts A SMY S2 PPM CC5 T Page 1 Company headquarters Continental Automotive Technologies GmbH Vahrenwalder Str. 9, 30165 Hanover, Germany Register Court: Hanover Commercial Register No. HRB 3669, Tax ID: 25/200/00133 VAT-No. DE 341447066 Plant Regensburg Siemensstrasse 12, Regensburg, 93055, Germany Telefon +49 941 790 0 Telefax +49 941 790 4999 www.continental.com General Radio Homologation Information This device contains license-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canadas license-exempt RSS(s) and complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
Automotive 1. This device may not cause harmful interference. 2. This device must accept any interference received, including interference that may cause undesired operation of the device. Lmetteur/rcepteur exempt de licence contenu dans le prsent appareil est conforme aux CNR dInnovation, Sciences et Dveloppement conomique Canada applicables aux appareils radio exempts de licence. Lexploitation est autorise aux deux conditions suivantes :
1. Lappareil ne doit pas produire de brouillage. 2. Lappareil doit accepter tout brouillage radiolectrique subi, mme si le brouillage est susceptible den compromettre le fonctionnement. Changes or modifications made to this equipment not expressly approved by Continental Automotive Technologies GmbH may void the FCC authorization to operate this equipment. The radiated output power of the device is far below the FCC and ISED radio frequency exposure limits. Nevertheless, the device should be used in such a manner that the potential for human contact during normal operation is minimized. Functional description of the RF-transmitter The transmitter is part of the Mercedes Benz access-control-system FBS2B. In general the following external functions are provided:
LOCK of the car by RF or infrared (IR) UNLOCK of the car by RF or infrared (IR) remote control for rear opening hood (ROH) panic function (only the 4-button variant) comfort LOCK by infrared comfort UNLOCK by infrared battery protection control by optical red LED toggling of the default-unlock-function global- or selective unlock Power supply The transmitter is provided with 2 Lithium batteries (CR2025) which means a total power supply of
+6V. The voltage of the batteries is checked with every triggered RF-telegram. If this supply-voltage decrease under 3V (defined threshold), no more RF-telegrams will be transmitted. This low-voltage-detection is made by the components D2, R7 and the integrated A/D-
converter of the controller. A reverse-battery-protection is realized with D1. Microcontroller uPD754264 from NEC with AD-converter and EEPROM on chip. The clock for the controller is generated by a 2.6 MHz SMD-resonator. Company headquarters Continental Automotive Technologies GmbH Vahrenwalder Str. 9, 30165 Hanover, Germany Register Court: Hanover Commercial Register No. HRB 3669, Tax ID: 25/200/00133 VAT-No. DE 341447066 Plant Regensburg Siemensstrasse 12, Regensburg, 93055, Germany Telefon +49 941 790 0 Telefax +49 941 790 4999 www.continental.com Olaf Stranghner Technology, Manager Spare Parts A SMY S2 PPM CC5 T Page 2 Buttons LOCK (S1):
Automotive used to send the LOCK-telegram and change the global/selective-unlock setting. UNLOCK (S2):
used to send the UNLOCK-telegram and change the global/selective-unlock setting. Pressing a button turns the corresponding input-pin via an internal pull-up resistor to ground. ROH (S3):
by pressing this button more than 500msec, a IR- / RF-telegram will be sent corresponding to the LOCK / UNLOCK function. The vehicle responds to unlock the rear opening hood (ROH). Panic (S4):
the Panic function is defined only for the USA variants (no IR). If the button S4 (Panic) is pressed for at least 1 sec., the function is activated. This timeout period was introduced in order to exclude faulty operations. The alarm can be deactivated on the key only by a further short button press on PANIC. Technical description of the RF-transmitter Oscillator The oscillator follows the colpitis oscillation principle stabilized by the SAW. The frequency is fixed to 315 MHz 125 kHz. The RF-transistor BFR92 is a SMD type. The transit-frequency is amount to 9 Ghz. Parallel resonance circuit The parallel resonance circuit (LC-circuit) is realized by the printed antenna and the combination of C3 and C4. Infrared transmitter The infrared transmitter consists of a npn transistor (FMMT 491), a base input resistor R9, a collector resistor R10 and an infrared transmitting diode D3 (SFH487-2). Mechanical design The mechanical design consists of two parts:
a) container b) printed circuit board (PCB) The battery-tank is integrated in the container between two metal-sheets on the PCP. Company headquarters Continental Automotive Technologies GmbH Vahrenwalder Str. 9, 30165 Hanover, Germany Register Court: Hanover Commercial Register No. HRB 3669, Tax ID: 25/200/00133 VAT-No. DE 341447066 Plant Regensburg Siemensstrasse 12, Regensburg, 93055, Germany Telefon +49 941 790 0 Telefax +49 941 790 4999 www.continental.com Olaf Stranghner Technology, Manager Spare Parts A SMY S2 PPM CC5 T Page 3 Transmitter modes Automotive the key works in NORMAL-mode and runs with standard RF-telegrams. The user can determine if in NORMAL-mode by pressing any key for 1 sec to see a short blink of the red LED. Entry:
First power-up-reset. After that press button LOCK or UNLOCK for a standard RF-telegram. Exit:
Press the button LOCK again Electrical data carrier frequency:
output power (carrier frequency):
modulation:
duration of telegram:
transmission format:
transmission rate:
current consumption (active):
current consumption (stand by):
operating remote-range:
power-supply:
operation live:
operating temperature:
315 MHz 125kHz typ. -24 dBm ASK 82 ms Manchester code 1 kBaud typ. 5,5 mA
< 1uA 10 - 15 m 2 Li-batteries (CR2025) typical 2 years
-10C .....+60C Company headquarters Continental Automotive Technologies GmbH Vahrenwalder Str. 9, 30165 Hanover, Germany Register Court: Hanover Commercial Register No. HRB 3669, Tax ID: 25/200/00133 VAT-No. DE 341447066 Plant Regensburg Siemensstrasse 12, Regensburg, 93055, Germany Telefon +49 941 790 0 Telefax +49 941 790 4999 www.continental.com Olaf Stranghner Technology, Manager Spare Parts A SMY S2 PPM CC5 T Page 4 Automotive Variants USA / Canada Part number Component Type Variation description 5WK4 795 remote-control key with 315MHz transponder 5WK4 698 remote-control key with 315MHz transponder 4-button-RF-sender
(with panic button) technical variant:
reduced assembly 2-button-RF-sender 5WK4 7950A remote-control key with 315MHz 3-button-RF-sender transponder Company headquarters Continental Automotive Technologies GmbH Vahrenwalder Str. 9, 30165 Hanover, Germany Register Court: Hanover Commercial Register No. HRB 3669, Tax ID: 25/200/00133 VAT-No. DE 341447066 Plant Regensburg Siemensstrasse 12, Regensburg, 93055, Germany Telefon +49 941 790 0 Telefax +49 941 790 4999 www.continental.com Olaf Stranghner Technology, Manager Spare Parts A SMY S2 PPM CC5 T Page 5 Block-diagram Automotive Company headquarters Continental Automotive Technologies GmbH Vahrenwalder Str. 9, 30165 Hanover, Germany Register Court: Hanover Commercial Register No. HRB 3669, Tax ID: 25/200/00133 VAT-No. DE 341447066 Plant Regensburg Siemensstrasse 12, Regensburg, 93055, Germany Telefon +49 941 790 0 Telefax +49 941 790 4999 www.continental.com Olaf Stranghner Technology, Manager Spare Parts A SMY S2 PPM CC5 T Page 6 Mechanical Design Automotive Company headquarters Continental Automotive Technologies GmbH Vahrenwalder Str. 9, 30165 Hanover, Germany Register Court: Hanover Commercial Register No. HRB 3669, Tax ID: 25/200/00133 VAT-No. DE 341447066 Plant Regensburg Siemensstrasse 12, Regensburg, 93055, Germany Telefon +49 941 790 0 Telefax +49 941 790 4999 www.continental.com Olaf Stranghner Technology, Manager Spare Parts A SMY S2 PPM CC5 T Page 7