AN2201 Freescale Semiconductor / Motorola, AN2201 Datasheet

Manufacturer Part Number

AN2201

Description

Low Battery Cranking Pulse in Automotive Applications

Manufacturer

Freescale Semiconductor / Motorola

Datasheet

1.AN2201.pdf (8 pages)

Application Note

AN2201/D

Rev. 0, 11/2001

Low Battery Cranking Pulse in

Automotive Applications

by Axel Bahr

1 Introduction

2 Cranking Pulse

Motorola Field Applications Engineering

Munich, Germany

Electronic modules in automotive applications have to withstand the

enviromental conditions in the car. These can be separated into mechanical

stresses, for example, vibrations, temperature or humidity, and electrical

stresses that are applied to the module.

This application note gives some more detailed information specifically about

significant voltage drops of the car’s battery.

Huge voltage drops can occur when certain events happen together, for

example, a discharged battery, low temperatures and the driver attempting to

start up the car.

This situation has been termed ‘cranking pulse‘ by car manufacturers. Although

different car manufacturers might have different voltage values defined in their

cranking pulse specification, the shape of the voltage dropping down and

recovering can be described by

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

Figure