AN2623 Freescale Semiconductor / Motorola, AN2623 Datasheet

AN2623

Manufacturer Part Number

AN2623

Description

LIN Temperature Sensor Using the MC68HC908QY/QY MCU

Manufacturer

Freescale Semiconductor / Motorola

Datasheet

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Application Note

AN2623/D

12/2003

LIN Temperature Sensor

Using the

MC68HC908QT/QY MCU

By Jiri Kuhn

Motorola Czech System Laboratories

Roznov p.R., Czech Republic

Introduction

CodeWarrior is a registered trademark of Metrowerks, Inc., a wholly owned subsidiary of Motorola, Inc.

This product incorporates SuperFlash

NOTE:

Many applications in the automobile industry and other areas require

connecting and transferring information between two or more nodes. As the

complexity of circuits continues to increase, the amount of copper needed to

connect various equipment increases, too.

One solution to this demand is to use a serial multiplex bus, such as CAN or

LIN. The controller area network (CAN) bus has a higher bandwidth and is often

used to transfer data to and from the engine and other major parts of the car.

The local interconnect network (LIN) bus is a low-cost solution that is suited to

connect smaller parts within the car. Another LIN bus advantage is that it uses

only three wires: the LIN serial data line and the positive and negative supplies.

Also, there is a simple way to upgrade the system or add new features because

LIN is a digital solution.

This application note presents a simple LIN temperature sensor using the

MC68HC908QY4 LIN evaluation board. AN2264/D: LIN Node Temperature

Display deals with a temperature display implementation, but it does not cover

the use of a temperature sensor. This application can be used, for example, as

part of HVAC (heating, ventilation, and air conditioning), which usually includes

a keypad module, flaps control, multi-purpose display, and temperature

sensors.

HVAC applications are not the only applications that request temperature

measurements. For example, to assign the optimal operating point, minimize

exhalation, and maximize engine performance in motor control management,

the temperature of the outside air must be determined.

With the exception of mask set errata documents, if any other Motorola document

contains information that conflicts with the information in the device data sheet, the

data sheet should be considered to have the most current and correct data.

Freescale Semiconductor, Inc.

For More Information On This Product,

technology licensed from SST.

Go to: www.freescale.com

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