Datasheet

COMMUNICATIONS
SMBus
Smart Battery Data (SBData)
bq78PL114
www.ti.com ................................................................................................................................................ SLUS850B – SEPTEMBER 2008 – REVISED APRIL 2009
The bq78PL114 uses the industry-standard Smart Battery System ’ s two-wire System Management Bus (SMBus)
communications protocol for all external communication. SMBus version 2.0 is supported by the bq78PL114, and
includes clock stretching, bus fault time-out detection, and optional packet error checking (PEC). For additional
information, see the www.smbus.org and www.sbs-forum.org Web sites.
The data content and formatting of the bq78PL114 information conforms to the Smart Battery System ’ s (SBS)
Smart Battery Data specification, version 1.1. See the SBS/SMBus site at www.sbs-forum.com for further
information regarding these specifications.
This SBS Data (SBData) specification defines read/write commands for accessing data commonly required in
laptop computer applications. The commands are generic enough to be useful in most applications.
Because the bq78PL114 provides a wealth of control and battery information beyond the SBData standard, new
command codes have been defined by Texas Instruments. In addition, new battery data features, such as
state-of-health, use newly defined extended SBData command codes. Standard SMBus protocols are used,
although additional data values beyond those defined by the Smart Battery Data specification are employed. (For
example, the bq78PL114 typically is used in a multicell battery system and may report individual cell voltages for
up to eight cells. The bq78PL114S12 can report individual cell voltages for up to 12 cells. The SBData command
set only defines four cell-voltage registers.)
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