Technical Description

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1. SYSTEM OVERVIEW
The tire pressure monitoring sensor (referred as TPMS Tire Pressure Monitoring Sensor) consists
of the following units:
- Tire guard tire unit type TIS-10DH which includes an integrated pressure, temperature and
acceleration sensor and a RF transmitter.
- LF unit which includes a LF receiver (not described in this document)
The TPMS 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.
2. TECHNICAL DESCRIPTION
Carrier frequency: 315 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
Temperature range -40, +120°C
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
Averaging Factor_tFrame = -19.8dB
Baudrate 9600bps:= ToleranceBaudrate 1
%
:=
Framebyte 12byte 2
bit
+:=
Framebits
Framebyte
:=
Framebits 98=
tbit
1
Baudrate 1 ToleranceBaudrate−( )⋅
:=
tbit 0.10522
ms
⋅=
tFramebits tbit
Framebits
⋅:=
tFramebits 10.31145
ms
⋅=
tFrameFSKbits tFramebits
1
⋅:=
due to FSK 100%
AveragingFactor_tFrame 20log
tFrameFSKbits
100ms






:=