MOTOTECH MT-FOBG03 TRANSMITTER ASSY - SMART KEY User Manual
MOTOTECH Co., Ltd. TRANSMITTER ASSY - SMART KEY Users Manual
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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
1
PRODUCT SPECIFICATION AND MANUAL
2014.07
BUYER / PROJECT
SYMC / C225 MT FOBG 03
BUYER MODEL
TRANSMITTER ASSY – SMART KEY
PART No.
COMPANY
Mototech Co,.
MAKER/NATION
Mototech Co,./Republic of Korea
DRAFT PART
Research Center
DRAFTER
K.H CHO

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
2
Table of Contents
1. CONTENTS ............................................................................................................ 3
2. ELECTRONIC SPEC.............................................................................................. 3
3. SPECIFICATION .................................................................................................... 4
4. REPAIR OF UNIT & CIRCUIT EXPLANATION ...................................................... 4
5. THE METHOD OF UNIT OPERATING ................................................................... 5
6. THE SYSTEM OF EACH UNIT CODE DISCRIMINATION .................................... 6

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
3
1. Contents
TYPE
Wireless controller about wireless electronic equipment of specific
low output radio station
MODEL NAME
USE
Vehicle of door keyless controller what use 133.3KHz & 433.92 MHz
frequency
SUMMARY
1. This equipment use semiconductor and integrated circuit, so it
designs to get high reliability.
2. This equipment use oscillation circuit of crystal, so it designs to
satisfy about legally frequency an allowable error and bandwidth of
exclusive frequency.
3. The transmitter has each other specific identification code.
4. The power use Li-ion coin Battery (DC 3.0V)
COMPOSITION
1. RF Transmitter part
2. Pattern Antenna
3. LF Receiver
4. LF Antenna.
2. ELECTRONIC SPEC
UNIT
List
TRANSMITTER(FOB)
Rated voltage
DC 3.0V
Voltage range
UNIT 2.1 ~ 3.6V
( except Battery influence)
Operating Temperature range
-20 ~ +60℃
Storage temperature range
-30 ~ +80℃
Dark current
6.1μA ±0.4uA

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.

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
5
5. The Method of Unit Operating
5.1 REMOTE
PICTURE OF UNIT
FUNCTION
SWITCH FUNCTION
LOCK
BUTTON
DOOR
LOCK
SHORT PRESSING LOCK BUTTON
OVER 0.03s
- RED LED flicker once as short time
ESCORT
LONG PRESSING LOCK BUTTON
OVER 1.5s
- ESCORT signal output After LOCK
signal output,
- RED LED flicker once as short time
After LOCK LED flicker
UNLOCK
BUTTON
DOOR
UNLOCK
SHORT PRESSING UNLOCK BUTTON
UNDER 0.03s
- RED LED flicker once as long time
TAIL GATE
OPEN
BUTTON
TAIL GATE
OPEN
LONG PRESSING TAIL GATE OPEN
BUTTON
OVER 1s
- RED LED flicker once as short time
PANIC
BUTTON
PANIC
LONG PRESSING PANIC BUTTON
OVER 1s
- RED LED flicker once as short time
LOCK BUTTON
UNLOCK BUTTON
PANIC BUTTON
TAIL GATE OPEN
BUTTON
RELEASE BUTTON

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
6
6. The System of Each Unit Code Discrimination
6.1 TRANSMISSION CODE
RKE RF DATA : 88 Manchester Code(176bits) + 4개 Bits
- 16 Codes : Preamble
- 4 bits : Header(‘0000’)
- 24 Codes : Signature
- 40 Codes : Random Data
- 8 Codes : Serial & Button Data & Battery Voltage Low Data
AFTER LF RECIVE, RF DATA : 48 Manchester Code(96bits) + 4 Bits
- 16 Codes : Preamble
- 4 bits : Header(‘0000’)
- 24 Codes : Signature
- 8 Codes : Serial & Battery Voltage Low Data
6.2 DATA STRUCTURE (“1", "0”)
송신 “1”
“0”
400us 400us
400us 400us
FCC (Federal Communications Commission)
WARNING: This equipment may generate or use radio frequency energy.
Changes or modifications to this equipment may cause harmful interference unless the modifications
are expressly approved in the instruction manual.
The user could lose the authority to operate this equipment if an unauthorized change or
modification is made.
This device complies with Part 15 of the FCC`s Rules. Operation is subject to the following two
Conditions:
1. This device may not cause harmful interference, and
2. This device must accept ant interference received, including interference that may cause
undesirable operation.