Tire Pressure Monitoring (TPM) System
www.DataSheet4U.com
AN238
Tire Pressure Monitoring (TPM) System
Authors: Ruan Lourens Microchip Technology Inc. Curtis ...
Description
www.DataSheet4U.com
AN238
Tire Pressure Monitoring (TPM) System
Authors: Ruan Lourens Microchip Technology Inc. Curtis Kell Kell Laboratories An auto-location system can dynamically detect the position of a specific sensor, which is useful when tires are rotated. The heart of the TPM system is the Sensor/Transmitter (S/TX) device and it is based on Microchip's rfPIC12F675.
INTRODUCTION
This document explains a typical tire pressure monitoring (TPM) system specifically intended for automotive use. It serves as a reference to design a real-world system based on various Microchip products. A TPM system primarily monitors the internal temperature and pressure of an automobile's tire. There is a variety of system approaches to follow, although this one is a rather comprehensive auto-location system.
SYSTEM COMPONENTS
The TPM system consists of the following major component. Sensor/Transmitter Device RF Receiver Module Low Frequency (LF) Commander Device Control Unit Pressure Vessel (Tire)
FIGURE 1:
TIRE PRESSURE MONITORING (TPM) SYSTEM
2004 Microchip Technology Inc.
DS00238B-page 1
www.DataSheet4U.com
AN238
Sensor/Transmitter (S/TX) Device
There are typically five S/TX units per vehicle, one per wheel, and the spare tire. Each unit has a unique serial number enabling the system to distinguish between each tire. When mounted within a vehicle tire, the S/TX periodically measures internal tire pressure, temperature and battery condition. It then sends a RF signal...
Similar Datasheet