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TIME AND DATE STAMP AND/OR ELAPSED TIME COUNTER ON GONE CELL AND/OR LOW CELL

IP.com Disclosure Number: IPCOM000006440D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2002-Jan-03
Document File: 3 page(s) / 123K

Publishing Venue

Motorola

Related People

George William McClurg: AUTHOR

Abstract

It is commonplace to have pagers and other porta- ble products monitor the capacity of the power source; in the pager's case a dry cell battery is usually the power source. The typical pager will have a predetermined volt- age level at which point the user is warned when the battery voltage drops too low. Let this voltage level at this point be defined as "low cell?' When the pager is in the low cell state it is still capable of receiving pages; but as the battery capacity continues to decrease the battery voltage reaches a level where the pager can no longer support paging functions. This state can be defined as 'gone cell? The purpose of the low cell state is to warn the user that the battery voltage level is low, and to enable the user to change the battery with a minimal chance of missing pages. In the case of some pagers certain steps may be taken by the pager to conserve battery life, such as shorten alerts, once the low state has been reached.

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MOTOROLA INC. Technical Developments Volume 15 May 1992

TIME AND DATE STAMP AND/OR ELAPSED TIME COUNTER ON GONE CELL AND/OR LOW CELL

by George William McClurg

INTRODUCTION

  It is commonplace to have pagers and other porta- ble products monitor the capacity of the power source; in the pager's case a dry cell battery is usually the power source. The typical pager will have a predetermined volt- age level at which point the user is warned when the battery voltage drops too low. Let this voltage level at this point be defined as "low cell?' When the pager is in the low cell state it is still capable of receiving pages; but as the battery capacity continues to decrease the battery voltage reaches a level where the pager can no longer support paging functions. This state can be defined as 'gone cell?

  The purpose of the low cell state is to warn the user that the battery voltage level is low, and to enable the user to change the battery with a minimal chance of missing pages. In the case of some pagers certain steps may be taken by the pager to conserve battery life, such as shorten alerts, once the low state has been reached.

  When the pager is in the gone cell state the only responsibility of the pager is to maintain memory and keep time if the pager has been designed with memory backup and a real time clock. For purposes of this arti- cle it is assumed that the pager has been designed with memory backup and real time clock functions.

TIME AND DATE STAMP APPLICATION

1. LOW CELL The pager will use the real time clock to store the date and time that the low cell state was entered. The user will be able to read the low cell time and date infor- mation via the LCD (liquid crystal display) to estimate the amount of time the pager will operate before entering the gone cell state. The user will know from past experi- ence how long to expect the pager to operate in the low cell state. Refer to Figure 1. The time and date stamp information will be displayed to the user on the LCD upon request; this will take place in the "continue processing" part of the flow chart.

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2. GONE CELL

  The pager will use the real time clock to store the time and date when the gone cell state was activated. When the pager battery has been replaced with a fresh battery and the pager becomes functional again the gone cell time and date stamp will be readable by the user via the LCD. This information will tell the user at what point in time the pager entered the gone cell state (unable to receive pages). If the service is offered by the RCC (radio common carrier) the user can contact the RCC and retrieve the missed pages. Refer to Figure 2. The user will be ab...