Continental Automotive 451 TX User manual

Continental Automotive GmbH I BS PG3 CFRF WM
I:\POSTZULA\z1_Projekte\B_Abgeschlossen\Abgeschlossene_Projekte_(2005_2009)\Smart_W451\Smart_W451_Key\Technische_Doku_doc\2012_06_Func_Sm
artW451TX_434_MHz.doc
Page 1 of 5
User Manual
of the
Continental Transmitter
TYPE
451 TX
5WK45146

Continental Automotive GmbH I BS PG3 CFRF WM
I:\POSTZULA\z1_Projekte\B_Abgeschlossen\Abgeschlossene_Projekte_(2005_2009)\Smart_W451\Smart_W451_Key\Technische_Doku_doc\2012_06_Func_Sm
artW451TX_434_MHz.doc
Page 2 of 5
1. General Description of the RF Transmitter
The described system is a radio-frequency remote control (usually called Remote Keyless Entry
system) for central doors locking / unlocking destined to equip the Smart W451 car line. The
system components constituting the Smart W451 application are:
The RF key with 3 or 4 buttons (doors locking / unlocking, trunk unlocking), including the
transponder function.
The SAM which integrates the RF receiver, and in which the remote control decoding is
done.
The immobiliser with an LF coil antenna.
The transmitter is used to transmit information for locking or unlocking the vehicle by a
unidirectional RF transmission line for normal remote operation by pressing a button. Also is
implemented the function of the Immobilizer in the transmitter with a bidirectional LF –
transmission (passive).
In general the following functions are provided:
Lock the car
Unlock the car
Unlock the boot lid of the car
Panic alarm
Immobilizer (motor start)
2. Key Constitutive parts
The RF key is constituted with:
Bottom shell with the integrated holder for the mechanical key blade
Mechanical key blade
Top shell
Sealing and switch pad
Button support
PCB with minus pole SMD battery contact
Plus pole battery contact
3V Lithium cell battery CR2016, 90mAh

Continental Automotive GmbH I BS PG3 CFRF WM
I:\POSTZULA\z1_Projekte\B_Abgeschlossen\Abgeschlossene_Projekte_(2005_2009)\Smart_W451\Smart_W451_Key\Technische_Doku_doc\2012_06_Func_Sm
artW451TX_434_MHz.doc
Page 3 of 5
3. Power Supply
The transmitter is provided with 1 lithium battery (CR 2016) that gives a
power supply of +3V. The key is protected against polarity reversal due to wrong battery insertion
by mechanical means. The battery capacity covers the typical usage pattern of 10000 activations
during two years.
4. Button functions
User Action
Performed Function at Vehicle
short LOCK button press
central locking
LOCK button press for more than 500ms
(about)
LOCK comfort function starts
short UNLOCK button press
central unlocking
UNLOCK button press for more than 500ms
(about)
UNLOCK comfort function starts
TRUNK button press
unlock trunk
5. Block Diagram of the Transmitter
PLL RF
stage
3 or 4 switches
LF coil
Battery
PCF 7941: Starc2xl
Transponder Interface
Clock
EEPROM
Power supply managment
E-ROM/ROM
8 bit RISC unit
I/O Interface
Crystal

Continental Automotive GmbH I BS PG3 CFRF WM
I:\POSTZULA\z1_Projekte\B_Abgeschlossen\Abgeschlossene_Projekte_(2005_2009)\Smart_W451\Smart_W451_Key\Technische_Doku_doc\2012_06_Func_Sm
artW451TX_434_MHz.doc
Page 4 of 5
6. Mechanical Design
Top view
Bottom view Side view
7. Technical Data
Carrier frequency: 433 MHz ± 81ppm (ECE),
Output power : < 10mW
Type of modulation: FSK
Method of frequency generation: PLL
Number of channels: 1
Power supply: battery (CR 2016)
Type of battery: lithium
Lock
Unlock
Trunk
Key Blade
(VALEO)

Continental Automotive GmbH I BS PG3 CFRF WM
I:\POSTZULA\z1_Projekte\B_Abgeschlossen\Abgeschlossene_Projekte_(2005_2009)\Smart_W451\Smart_W451_Key\Technische_Doku_doc\2012_06_Func_Sm
artW451TX_434_MHz.doc
Page 5 of 5
8. Label Design
Continental
451 TX
5WK45146