SS4002AG Datasheet, PDF (1/23 Pages) Silicon Standard Corp. – Smart Li-Ion Battery Gas Gauge

SS4002AG
Smart Li-Ion Battery Gas Gauge
PRODUCT SUMMARY
Accurately measures available charge in Li-Ion batteries
Provides 14-bit resolution for voltage, temperature, and current measurements
Controls the MOSFETs used in the Li-Ion protection circuit
FEATURES
Supports SBS Smart Battery Data Specification v1.1
Supports the 2- wire SMBus v1.1 interface with PEC
Reports individual cell voltages
Monitors and provides control to charge and
discharge the MOSFETs used in a Li- Ion
protection circuit
Pb-free, RoHS compliant.
GENERAL DESCRIPTION
The SS4002AG is an SBS-compliant gas gauge IC for
battery pack or in-system installation. It maintains an
accurate record of available charge in rechargeable
batteries. The SS4002AG is designed specifically for Li-Ion
batteries, and monitors capacity and other critical
battery parameters. The SS4002AG uses an A-to-D
converter with automatic offset error correction for
voltage, temperature, and current reporting. The
cumulated charge into (or discharge from) the battery is
continuously calculated. The onboard ADC also
monitors individual cell voltages in the battery pack and
allows the SS4002AG to generate control signals that may
be used in conjunction with a pack supervisor to enhance
pack safety.
The SS4002AG supports the smart battery data
(SBData) commands and charge -control functions. It
communicates data using the 2-wire System
Management Bus (SMBus). The data available includes
the battery’s remaining capacity, temperature, voltage,
Provides cell balance control output for charge
control.
Consumes less than 1.5mW during operation
Drives a 4- or 5-segment LED display for indication
of remaining capacity
Narrow (150-mil) SSOP-28
current, and remaining run-time predictions.
The SS4002AG provides drive pins for LEDs to depict
remaining battery capacity from full to empty in 20% or
25% increments with a 4 or 5-segment display.
The SS4002AG works with an external EEPROM. The
EEPROM stores the configuration information for the
SS4002AG, such as the self-discharge rate, measurement
calibration, and design voltage and capacity.
The SS4002AG uses the programmable self-discharge
rate and other compensat ion factors stored in the
EEPROM to accurately adjust remaining capacity for
use and standby conditions based on time, rate, and
temperature. The SS4002AG also automatically calibrates
or learns the true battery capacity in the course of a
discharge cycle from near full to near empty levels.
The VREF output regulates the operating voltage for
the SS4002AG from the battery cell stack using an
external MOSFET.
12/16/2005 Rev.3.01
www.SiliconStandard.com
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