User's Manual

R&D / Automotive Electronics
Title Remote Keyless Entry System Specification Spec. No. DPE-AE-RK019912S
Written by
Rev. No.
A0
Date 24 . July. 2007 Page
15 / 23
unit : us
ALL
Symbol Characteristic
Number
of TE
Min. Type Max
TE Basic pulse element 1 260 400 660
TBP PQM bit pulse width 3 780 1200 1980
TP Preamble duration 23 6.0 9.2 15.2
TH Header duration 10 2.6 4.0 6.6
THOP Hopping Code duration 96 25.0 38.4 63.4
TFIX Fixed Code duration 102 26.5 40.8 67.3
TG Guard Time 39 10.1 15.6 25.7
Total Transmit Time 270 70.2 108.0 178.2
PWM data rate 1282 833 505
[Table 7. Data Bit Timing Table]
4.2.3 TRANSMITTER FUNCTION
The transmitter trans the high frequency signal using the PWM (Pulse Width Modulation)
method. The synchronization information, fixed information and switch information will be
encrypted to form the hopping code. The encrypted or hopping code portion of the transmission
will change every time a button is pressed, even if the same button is pushed again. Keeping a
button pressed for a long time will result in the same code word being transmitted until the button
is released or time-out occurs. If in the transmit process, it is detected that a new button is
pressed, the current code word will be aborted. A new code word will be transmitted and the
time-out counter will reset. If all the buttons are released, the minimum code words will be
completed.
4.2.4 BATTERY
Battery removal shall be able to be performed without specialized tools. Average time to replace
a battery shall be less than 5 minutes. No damage to the transmitter shall result if the batteries