<strong>Smart</strong> <strong>Battery</strong> <strong>Selector</strong> <strong>Specification</strong><strong>Revision</strong> History<strong>Revision</strong> Number Date Author Notes0.9 4/13/95 R. Dunstan Initial public release1.0 9/5/96 M. Fruin / R. Dunstan <strong>Revision</strong> 1.0<strong>1.1</strong> 12/11/98 R. Dunstan/S Fukatsu <strong>Revision</strong> <strong>1.1</strong><strong>SBS</strong> Implementers Forum Page iii<strong>Revision</strong> <strong>1.1</strong>
<strong>Smart</strong> <strong>Battery</strong> <strong>Selector</strong> <strong>Specification</strong>1. IntroductionThe <strong>Smart</strong> <strong>Battery</strong> <strong>Selector</strong> <strong>Specification</strong> is an adjunct to the <strong>Smart</strong> <strong>Battery</strong> Data <strong>Specification</strong>, providing asolution for many of the complexities associated with the implementation of multiple-battery systems suchas notebook computers. Systems that operate with more than one battery pose a number of challenges forboth the system’s designer and the system’s power management software. Since batteries and AC powercan come and go, literally, at the user’s whim without regard for the system’s power requirements, a <strong>Smart</strong><strong>Battery</strong> <strong>Selector</strong> must be capable of responding to these events without compromising the integrity of thesystem’s power supply. Additionally, the selector should notify the system’s power management softwarewhen a change has taken place, such as when a battery is inserted or removed.This specification describes battery selector options and the interface the selector presents to the hostsystem. The actual selector implementation can range from a single integrated component, to emulationdone using a notebook’s keyboard controller, or to a microcontroller implementing selector functionality inaddition to a <strong>Smart</strong> <strong>Battery</strong> Charger. The purpose of this specification is to describe the minimum expectedfunctionality and interface.<strong>1.1</strong>. ScopeThis document specifies the data set used by a <strong>Smart</strong> <strong>Battery</strong> <strong>Selector</strong> and the minimal functionality thatsuch a device must provide. The actual electrical and mechanical specifications will be described by abattery selector component’s manufacturer. This specification is generic with regard to the actualimplementation.1.2. AudienceThe audience for this document includes:• <strong>Smart</strong> <strong>Battery</strong> System component manufacturers• <strong>Smart</strong> <strong>Battery</strong> System designers• Designers of power management systems for <strong>Smart</strong> <strong>Battery</strong> powered portable electronic equipment2. References• <strong>Smart</strong> <strong>Battery</strong> Data <strong>Specification</strong>, <strong>Revision</strong> <strong>1.1</strong>, <strong>SBS</strong>-Implementers Forum, December, 1998• <strong>Smart</strong> <strong>Battery</strong> Charger <strong>Specification</strong>, <strong>Revision</strong> <strong>1.1</strong>, <strong>SBS</strong>-Implementers Forum, December, 1998• <strong>Smart</strong> <strong>Battery</strong> System Manager <strong>Specification</strong>, <strong>Revision</strong> <strong>1.1</strong>, <strong>SBS</strong>-Implementers Forum, December,1998• System Management Bus <strong>Specification</strong>, <strong>Revision</strong> <strong>1.1</strong>, <strong>SBS</strong>-Implementers Forum, December, 1998• System Management Bus BIOS Interface <strong>Specification</strong>, <strong>Revision</strong> 1.0, February 15, 1995• ACPI <strong>Specification</strong>s, Version 1.0a, Intel Corporation, Microsoft Corporation, Toshiba Corp., July 1998(http://www.teleport.com/~acpi)• The I²C-bus and how to use it, Philips Semiconductors document #98-8080-575-01.<strong>SBS</strong> Implementers Forum Page 1<strong>Revision</strong> <strong>1.1</strong>
Change language