Browse Prior Art Database

Power Dissipation Reduction Mechanism for PCMCIA I/O Cards

IP.com Disclosure Number: IPCOM000105986D
Original Publication Date: 1993-Sep-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Hatta, T: AUTHOR [+4]

Abstract

Disclosed is a mechanism to reduce power dissipation of PCMCIA I/O cards by detecting the detachment of the I/O cable from the I/O connector. This mechanism achieves the saving of battery and longer operations of notebook and portable PCs.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Power Dissipation Reduction Mechanism for PCMCIA I/O Cards

      Disclosed is a mechanism to reduce power dissipation of PCMCIA
I/O cards by detecting the detachment of the I/O cable from the I/O
connector.  This mechanism achieves the saving of battery and longer
operations of notebook and portable PCs.

           The figure shows an example of this mechanism which
comprises the following three major components:

1.  Cable detect pin or lead of I/O connector.
2.  Circuitry to detect a signal from the cable detect pin or lead
    (Cable detachment detection circuit 10).
3.  Circuitry to control operation modes and power supply (Power
    control circuit 12).

           When the cable is detached, the cable detachment detection
circuit 10 detects a signal (a) indicating the cable detachment and
triggers the power control circuit 12 by a signal (b).  The power
control circuit 12, when triggered by the signal (b), generate a
signal (c) to MPU 14, memory 16 and other components (not shown) to
put them into a power saving or standby mode.  Power supply to these
components may be stopped instead of putting them into the standby
mode.

           The present mechanism achieves the effective reduction of
power dissipation in the notebook and portable PCs by a simple
triggering based on the I/O cable detachment.