FEATURES DESCRIPTION
APPLICATIONS
bq2084-V123
SLUS619B – AUGUST 2004 – REVISED JUNE 2005
SBS v1.1 COMPLIANT GAS GAUGE FORUSE WITH THE bq29312
•Provides Accurate Measurement of Available
The bq2084-V123 SBS-compliant gas gauge IC forCharge in Li-Ion and Li-Polymer Batteries
battery pack or in-system installation maintains anaccurate record of available charge in Li-ion or•Supports the Smart Battery Specification
Li-polymer batteries. The bq2084-V123 monitors ca-(SBS) V1.1
pacity and other critical parameters of the battery•Integrated Time Base Eliminates Need for
pack and reports the information to the system hostExternal Crystal
controller over a serial communication bus. It is– Optional Crystal input
designed to work with the bq29312 analog front-end(AFE) protection IC to maximize functionality and•Works With the TI bq29312 Analog Front End
safety and minimize component count and cost in(AFE) Protection IC to Provide Complete Pack
smart battery circuits. Using information from theElectronics for 7.2-V, 10.8-V or 14.4-V Battery
bq2084-V123, the host controller can manage re-Packs With Few External Components
maining battery power to extend the system run time•Powerful RISC CPU Core With
as much as possible.High-Performance Peripherals, Low Power
The bq2084-V123 uses an integrating converter withConsumption
continuous sampling for the measurement of battery•Integrated FLASH Memory Eliminates the
charge and discharge currents. Optimized for cou-Need for External Configuration EEPROM
lomb counting in portable applications, theself-calibrating integrating converter has a resolution•Uses 16-Bit Delta Sigma Converter for
better than 0.65-nVh and an offset measurementAccurate Voltage and Temperature
error of less than 1-µV (typical). For voltage andMeasurements
temperature reporting, the bq2084-V123 uses a 16-bit•Measures Charge Flow Using a High
A-to-D converter. In conjunction with the bq29312,Resolution 16-Bit Integrating Converter
the onboard ADC also monitors the pack and individ-ual cell voltages in a battery pack and allows the– Better Than 0.65-nVh of Resolution
bq2084-V123 to generate the control signals necess-– Self-Calibrating
ary to implement the cell balancing and the required– Offset Error Less Than 1-µV
safety protection for Li-ion and Li-polymer batterychemistries.•Programmable Cell Modeling for MaximumBattery Fuel Gauge Accuracy
The bq2084-V123 supports the Smart Battery Data•Drives 3-, 4-, or 5-Segment LED Display for
(SBData) commands and charge-control functions. ItRemaining Capacity Indication
communicates data using the System ManagementBus (SMBus) 2-wire protocol. The data available•Available in a 38-Pin TSSOP (DBT) Package
include the battery's remaining capacity, temperature,voltage, current and remaining run-time predictions.
The bq2084-V123 provides LED drivers and a•Notebook PCs
push-button input to depict remaining battery capacity•Medical and Test Equipment
from full to empty in 20%, 25%, or 33% increments•Portable Instrumentation
with a 3-, 4-, or 5-segment display.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2004–2005, Texas Instruments IncorporatedProducts conform to specifications per the terms of the TexasInstruments standard warranty. Production processing does notnecessarily include testing of all parameters.