User's Manual

MOTOTECH CO., LTD.
Title
Certification Request Document
Project Name
C225
Drawn
2014-03-28
Model Name
Released
2014-07-15
Made by
K.H CHO
4
3. Specification
TYPE
TRANSMITTER ASSY – SMART KEY
NAME
Wireless controller about wireless electronic equipment of
specific low output radio station)
Equipment List
RF Transmitter, LF Receiver
Frequency
TX: 433.920MHz, RX: 133.3KHz
Antenna composition
Pattern ANTENNA, LF ANTENNA
Oscillation method
Crystal oscillation
Modulation method
FSK
Communication method
Two-Way Communication ( LF & RF each other)
Frequency multiplier
32 multiplier
4. Repair of Unit & Circuit Explanation
4.1 Repair of Unit
Exchange an old unit.
4.2 Circuit Explanation
If User presses specific Switch of transmitter, MCU makes inherent serial value
and Encryption value, so it print what CPU make data, at the same time , RF IC get to be
ENABLE.
Printing data are falsified into TxIC and it synthesize through CRYSTAL. Compounded
frequency is amplified by TxIC and it transmits through antenna from matching circuit
diagram of output.
FOB receives RANDOM DATA through LF Antenna and print to encrypt result value from
MCU, at the same time RF IC get to be ENABLE. As following, it transmits PATTERN
Antenna how to change falsification, synthesis, and multiplier.