Smart Battery Charger Specification
SBS Implementers Forum -Page 2- Revision 1.1
2. References
· Smart Battery Data Specification, Revision 1.1, SBS-Implementers Forum, December, 1998
· Smart Battery Selector Specification, Revision 1.1, SBS-Implementers Forum, December, 1998
· Smart Battery System Manager 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
3. Definitions
· Battery: One or more cells that are designed to provide electrical power.
· Cell: The cell is the smallest unit in a battery. Most batteries consist of several cells connected in
series, parallel, or a series-parallel combination.
· Host Controller: An intelligent entity that communicates with a Smart Battery and a Smart Battery
Charger, reading the battery’s charge requirements and controlling the battery charger. It can reside in
many places such as: an integrated part of the charger, a stand-alone component or part the SMBus
host controller.
· Smart Battery: A battery equipped with specialized hardware that provides present state, calculated
and predicted information to its System Host under software control.
· Smart Battery Charger: A battery charger that periodically communicates over the SMBus with a
Smart Battery and can alter its charging characteristics in response to information provided by the
Smart Battery. There are two types of Smart Battery Chargers described in this specification: Level 2
and Level 3.
· Smart Battery Selector: A Smart Device that controls multiple Smart Batteries in a system. It
establishes, arbitrates and maintains the power, communication and safety signal paths between the
Smart Battery, Smart Battery Charger and the System Host’s power supply.
· Smart Device: An electronic device or module that communicates over the SMBus with the System
Host and/or other Smart Devices. For example the back-light controller in a Notebook computer can
be implemented as a Smart Device.
· SMBus: The System Management Bus is a specific implementation of an I²C-bus that provides data
protocols, device addresses and additional electrical requirements that are designed to physically
transport commands and information between the Smart Battery, System Host, Smart Battery Charger
and other Smart Devices.
· System Host: A piece of portable electronic equipment powered by a Smart Battery which is able to
communicate with the Smart Battery and use information provided by the battery. The System Host is
identical to the SMBus Host for the purposes of this document.
· Programmatic Maximum: The maximum output level (current or voltage) that the charger is capable
of regulating. In calculating output accuracy as a function of full scale output, the programmatic
maximum serves as the full scale output value.
· Packet Error Check (PEC): An additional byte in the SMBus protocols used to check for errors in an
SMBus transmission. Refer to the System Management Bus Specification Revision 1.1. A Smart
Battery Charger indicates its ability to support PEC with the CHARGER_SPEC value in
ChargerSpecInfo() function.
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