Continental Automotive 5WK45032 RF Transmitter 5wk4 5032 315MHz User Manual Functional Description
Continental Automotive GmbH RF Transmitter 5wk4 5032 315MHz Functional Description
User Manual
FCC ID: KR55WK45032
File: s:\postzula\vw\kessy\func_5wk45032_e page 1 of 4
User Manual / Functional Description
of the
Siemens
RF Transmitter
5WK4 5032 315 MHz
Language: English
FCC ID: KR55WK45032
File: s:\postzula\vw\kessy\func_5wk45032_e page 2 of 4
General description of the RF transmitter
The 315 MHz RF remote control system consisting of a RF transmitter
and a RF receiver mounted within the control unit. The RF transmitter is
mechanically integrated in the head of the key. This transmitter is used to
transmit an information for locking or unlocking the vehicle by an
unidirectional RF transmission line for normal remote operation by pressing a
button. For passive access functionality the transmitter is able to reply to an
inductive command with sending a remote telegramme.
In general the following functions are provided by pressing the buttons:
- Lock the car
- Unlock the car
- Unlock trunc
Additional the following functions are provided (Keyless Entry/Go Functions):
- Lock/Unlock the car
- Start/Stop the engine
Power supply
The transmitter is provided with 1 Lithium battery (CR2032) that gives a
tension of feeding of +3V.
The battery inversion is protected mechanically.
Buttons
There are three buttons which enable to lock, unlock the doors and unlock the
trunk. During activation, the button is forced to the ground via a “pull-up”
within the microcontroller.
LED
The LED is turned on between transmission blocks.
FCC ID: KR55WK45032
File: s:\postzula\vw\kessy\func_5wk45032_e page 3 of 4
Oscillator
The oscillator is of PLL type. The operating frequency is about 315 MHz ± 75
kHz.
Mechanical design
The mechanical of the transmitter is composed of four parts:
the superior shell
the inferior shell
metal insert
battery support (mechanical protection to afford battery inversion)
The battery placement is integrated in the inferior shell.
Technical data
Carrier frequency 315 MHz ± 75 kHz
Output Power < -18 dBm (carrier frequency)
Type of modulation ASK
Method of frequency generation Crystal
Number of channels 1
Baudrate 2 k Baud
Power supply 3 Volt
Type of battery Lithium
Transmission range typical 10 meters
FCC ID: KR55WK45032
File: s:\postzula\vw\kessy\func_5wk45032_e page 4 of 4
Typical usage pattern
27 lock / unlock operations in 24 hours with a typical transmission duration of
500 milliseconds
Transmitter ON 13,5 seconds / 24 hours
Transmitter OFF 86.386,5 seconds / 24 hours
Duty Cycle: TON / T (ON+OFF) x 100% = 13,5 / 86.400 x 100 % = 0,015 %
Block diagram of the transmitter
Label design
Setup of homologation testing samples
For homologation testing the testing samples are equipped with continuous
transmission mode. After inserting the battery the transmitter starts continous
transmission until the battery is removed.
These special function have only been implemented for the testing related to
radio homologation.
This procedure does not correspond to the standard mode of
operation!!!
LED
Antenna
RF stage
µC Transponder /
inductive receiver
Power
Buttons
Siemens 315 MHz, 5WK4 5032
3D0 959 753 KWJJ
FCC ID: KR55WK45032
CAN: xxx xxx xxxx