Browse Prior Art Database

REMOTE ACCESSORY PACK

IP.com Disclosure Number: IPCOM000009561D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2002-Sep-03
Document File: 3 page(s) / 138K

Publishing Venue

Motorola

Related People

Mark Constable: AUTHOR

Abstract

This paper describes a system/device that can be employed to increase the functionality of a primary electronic device with a negligible increase in weight, volume, and dimensions of the primary device as well as a lower design cost. The system uses either a cord or a radio frequency link to com- municate with a remote accessory device rather than adding internal circuitry or a large snap-on sec- ondary module. This allows increased functionality without the need to significantly increase the size of the primary device and the design challenges of including it with the primary device.

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MOTOROLA Technical Developments

8

REMOTE ACCESSORY PACK

by Mark Constable

weight requirements are shrinking. The market is continually demanding reduced size and increased performance. These opposing requirements typical- ly result in reduced functionality to meet product size requirements,

  Increasing functionality on an existing portable wireless electronic device is typically accomplished one of three ways:

  1) Redesign the entire unit to include the added functionality.

  2) Add new printed wiring board assemblies to the existing package and modify the housing and internal cabling as needed.

  Portable electronics are growing increasingly 3.) Design a new module that attaches to the pri- complex and at the same time device size and mary device exterior as shown in Figure 1.

Module separated. Module attached

Fig. 1 Typical primary and secondary attached module.

0 Molomla.lnc. ,999 253 September 1999

ABSTRACT

  This paper describes a system/device that can be employed to increase the functionality of a primary electronic device with a negligible increase in weight, volume, and dimensions of the primary device as well as a lower design cost. The system uses either a cord or a radio frequency link to com- municate with a remote accessory device rather than adding internal circuitry or a large snap-on sec- ondary module. This allows increased functionality without the need to significantly increase the size of the primary device and the design challenges of including it with the primary device.

PROBLEM IDENTIFICATION

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MO7WROLA Technical Developments

  All three concepts have significant design prob- lems associated with them.

  Developing either the module or additional cir- cuitry is complicated and expensive. A significant amount of the cost is integrating the mechanical packages together. This applies to a separate mod- ule that attaches to a primary device or integration of additional circuitry into the device. In addition to the cost of the mechanical integration, the additional circuitry will also cause crosstalk problems, added weight, added bulk, reduced drop shock resistance, increased thermal problems, added load on the bat- tery, and inconvenience to the customer due to a larger weight and volume.

PROBLEM SOLUTION: REMOTE ACCESSORY MODULE

  A solution to this problem is to design the added functionality into a remote module. Communication to the remote module is accomplished with either a low power radio frequency link or a cord. The remote module solves several problems:

  l Its remote location results in elimination or a significant reduction in crosstalk problems.

  l The separate module allows a separate battery, reducing the load on the primary battery.

@

  l If an RF link is employed, the module doesn...