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TIRE PRESSURE MONITORING
SYSTEM USER ’S GUIDE
Chapter 2. System Overview
2.1
SYSTEM TECHNICAL SPECIFICATIONS
UHF Communication Frequency:
LF Communication Frequency:
Network Connectivity:
Modulation Format:
Encoding Method:
433.92 MHz
125 kHz
LIN or CAN, LIN is used in the design
ASK
PWM
2.2
OPERATION OVERVIEW
The Base Station wakes up the Sensor modules in each tire through the Low
Frequency Initiator to poll the pressure, temperature data and checks the battery level
in a sequential manner. The Base Station communicates to the LF initiator via the LIN
network. The LF initiator transmits a wake up challenge via a 125 kHz ASK modulated
signal to the Tire sensor module after a command has been received from the Base
Station. The 3-axis Analog Front End (MCP2030) of the Tire Sensor module validates
the incoming challenge and wakes up the microcontroller from sleep only if the pream-
bles match. The Tire Sensor module will then measure the pressure and the tempera-
ture, check the battery level and transmits the data to the Base Station via a 433.9 MHz
signal. The Base Station will display the information on the LCD after receiving the data.
The Base Station module contains a PIC18F4680. It is also implemented with a
MCP201 LIN Transceiver and MCP2551 CAN Transceiver for communications via LIN
or CAN.
The LF Initiator module contains a PIC18F2680. The module also contains a MCP201
and MCP2551 for LIN or CAN communication.
The Tire Sensor module contains a PIC16F684 with a MCP2030, a three-axis Analog
Front-End (AFE). The analog pressure sensor used is the MS5407-AM from Intersema.
? 2006 Microchip Technology Inc.
DS51624B-page 9
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