Smart Battery System Manager Specification
SBS Implementers Forum Page 1 Revision 1.0
1. Introduction
The Smart Battery System Manager is a specification that describes the requirements and the interface for a
component or system of components that manage a number of Smart Batteries in a system. It autonomously
connects one or more batteries to power the system, controls the charging of multiple batteries, reports the
characteristics of the battery(s) powering the system etc. System safety largely resides in its behavior. The
Smart Battery System Manager supercedes the Smart Battery Selector.
The Smart Battery Selector Specification, an adjunct to the Smart Battery Data Specification, provided a
solution for many of the complexities associated with the implementation of multiple-battery systems such
as notebook computers. However, it only supports batteries that charge or discharge, one-at-a-time. It has
no provisions for reporting that more than one battery is powering the system at a time and its interface
explicitly prohibits such an action.
Systems that operate with more than one battery pose a number of challenges for the system’s designer.
Since batteries and AC power can come and go, literally, at the user’s whim without regard for the system’s
power requirements, a Smart Battery System Manager must be capable of responding to these events
without compromising the integrity of the system’s power supply or safe operation. Additionally, the Smart
Battery System Manager (SBSM) should notify the system’s power management software when ever a
change takes place, such as when a battery is inserted or removed.
1.1. Scope
This specification describes the interface SBSM presents to the host system AND its minimum functional
requirements. The actual SBSM implementation range from a single integrated component, emulation done
using a notebook’s keyboard controller, or to a micro-controller implementing SBSM functionality in
addition to a Smart Battery Charger functionality. The purpose of this specification is to describe the
minimum expected functionality and interface.
This document specifies the data set used by a Smart Battery System Manager and the minimal functionality
that such a device must provide. The Smart Battery System Manager component’s manufacturer will cover
the actual electrical and mechanical specifications. This specification does not recommend or endorse any
particular implementation; it just sets forth the requirements for the actual implementation.
1.2. Audience
The audience for this document includes:
· Smart Battery System component manufacturers
· Smart Battery System designers
· Designers of power management systems for Smart Battery powered portable electronic equipment
2. References
· Smart Battery Data Specification, Revision 1.1, SBS-Implementers Forum, December, 1998
· Smart Battery Charger Specification, Revision 1.1, SBS-Implementers Forum, December, 1998
· Smart Battery Selector Specification, Revision 1.1, SBS-Implementers Forum, December, 1998
· System Management Bus Specification, Revision 1.1, SBS-Implementers Forum, December, 1998
· System Management Bus BIOS Interface Specification, Revision 1.0, February 15, 1995
· ACPI Specifications, 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.
· ACCESS.bus Specifications -- Version 2.2, ACCESS.bus Industry Group, 370 Altair Way Suite 215,
Sunnyvale, CA 94086 Tel (408) 991-3517
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