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METHOD FOR DETERMINING WHEN A SMART BATTERY IS DISCHARGE BELOW IT'S CRITICAL LOW CAPACITY

IP.com Disclosure Number: IPCOM000005670D
Original Publication Date: 2001-Oct-24
Included in the Prior Art Database: 2001-Oct-24
Document File: 3 page(s) / 267K

Publishing Venue

Motorola

Related People

Seng Pao Xiong: AUTHOR

Abstract

METHOD FOR DETERMINING WHEN A SMART BATTERY IS DISCHARGE BELOW IT'S CRITICAL LOW CAPACITY

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Method for Determining When a Smart Battery is Discharge Below It's Critical Low Capacity

By

Seng Pao Xiong

Problem

There exist a number of integrated circuits from various vendors that support the Smart Battery Data Specification, which defines the data set implemented by smart batteries.  Included in this data set is the capacity of the smart battery, which is updated as the smart battery is charged and discharged.  Normally, this data set is communicated via the SMBus protocol to a portable host device.  This invention solves the problem that arises when a portable host device cannot implement the SMBus protocol but still needs to have a way of determining when a smart battery is discharged below its critical capacity.

Batteries have always been considered as an unpredictable power supply for portable electronic devices.  For the most part, portable devices have relied on the battery voltage to guess on the capacity of the battery.  The smart battery solves this problem by incorporating the necessary hardware and software inside its package to determine and constantly track its capacity as well as its other characteristics defined by the Smart Battery Data Specification.  As a result, the state of the smart battery is known at all times as the battery is charged and discharged.  This information, gathered by the smart battery, can then be communicated to the portable host device via SMBus.  With this information, the host device can now maximize the use of the energy in the battery and properly shut itself down before the battery is completely drained.

Another important feature that smart batteries provide is a means for communicating the capacity of the smart battery to a user.  This allows the user to determine whether the battery will provide enough runtime and whether the battery needs to be c...