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Functional Description
of
TIS-09
Wheel Unit
Type
ASK/FSK 433.92 MHz
Tire Pressure Generation
_______________________________________________________________
FCC ID: KR5TIS-09
IC: 7812D-TIS09
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1. SYSTEM OVERVIEW
bit
Framebits
The tire pressure monitoring system (referred as TG for Tire Guard) consists of the following
un
its:
- Tire guard wheel unit type TIS-09 which includes an integrated pressure, temperature and
acceleration sensor and a RF transmitter.
- LF receiver unit which includes a LF receiver (not described in this document)
The TG monitors a vehicle's tire pressure whilst driving or stationary. An electronic unit (wheel
unit) inside each tire, mounted to the valve stem, periodically measures the actual tire pressure.
By means of RF communication, this pressure information is transmitted to the RF receiver.
ECHNICAL DESCRIPTION
2. T
Carrier frequency: 433.92 MHz
Number of channels: 1
Type of modulation: Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK)
Baud rate: 9600bps
Rated Output Power: < 10mW
Antenna: Internal
Voltage supply range: 2.1 up to 3.2V
3. TYPICAL USAGE PATTERN
3.1 AVERAGE FACTOR CALCULATION (Standard 47 CFR Part 15C (periodic
intentional transmitter))
Maximum transmitting duration in whatever 100ms windows: 10.31ms
Averaging factor = 20xlog(10.31/100)=-19.73dB
Baudrate 9600bps:=
Framebyte 12byte 2
Framebits Framebyte:=
Framebits 98=
tbit
:=
Baudrate 1 ToleranceBaudrate−( )⋅
tbit 0.10522ms⋅=
tFramebits tbit
tFramebits 10.31145ms⋅=
tFrameFSKbits tFramebits1⋅:=
AveragingFactor_tFrame 20log
Averaging Factor_tFrame = -19.8dB
⋅:=
ToleranceBaudrate 1%:=
+:=
1
:=
tFrameFSKbits
due to FSK 100%
100ms
_______________________________________________________________
FCC ID: KR5TIS-09
IC: 7812D-TIS09
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ASK WUP: 320 bits
Baudrate= 9600bps/s (+/-1%)
ASK: 50% duty cycle
Max WUP duration = 16.83ms
FrameASKbit
AveragingFactor_tWUP 20log
Averaging Factor_tWUP = -15.5dB
Note: The time between inter frames is always higher than the 100ms FCC window.
:=
tWUP
100ms
"依據低功率電波輻射性電機管理辦法：
•第十二條
經型式認證合格之低功率射頻電機，非經許可，公司、商號或使用者均不得擅自變更頻率、加大功率或變更原設計之特性
及功能。
•第十四條
低功率射頻電機之使用不得影響飛航安全及干擾合法通信；經發現有干擾現象時，應立即停用，並改善至無干擾時方得繼
續使用。
前項合法通信，指依電信法規定作業之無線電通信。
低功率射頻電機須忍受合法通信或工業、科學及醫療用電波輻射性電機設備之干擾。"
"NCC Warning Statement
Article 12
Without permission, any company, firm or user shall not alter the frequency, increase the power, or change the
characteristics and functions of the original design of the certified lower power frequency electric machinery.
Article 14
The application of low power frequency electric machineries shall not affect the navigation safety nor interfere a
legal communication, if an interference is found, the service will be suspended until improvement is made and
the interference no longer exists."
_______________________________________________________________
FCC ID: KR5TIS-09
IC: 7812D-TIS09
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