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BQ20851-V1P2 Datasheet

  • BQ20851-V1P2

  • SBS COMPLIANT GAS GAUGE IC FOR USE WITH THE BQ29311

  • 53頁

  • TI

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bq20851-V1P2
www.ti.com
SLUS575 鈭?AUGUST 2003
SBS COMPLIANT GAS GAUGE IC
FOR USE WITH THE bq29311
FEATURES
D
Provides Accurate Measurement of Available
D
D
D
D
Programmable Cell Modeling for Maximum
D
D
Battery Fuel Gauge Accuracy
Drives 3-, 4-, or 5-Segment LED Display for
Remaining Capacity Indication
38-Pin TSSOP (DBT)
D
D
D
D
Charge in Li-Ion and Li-Polymer Batteries
Supports the Smart Battery Specification
(SBS) V1.1
Integrated Time Base Removes Need for
External Crystal
Works With the TI bq29311 Analog Front End
(AFE) Protection IC to Provide Complete Pack
Electronics for 10.8-V or 14.4-V Battery Packs
With Few External Components
Based on a Powerful Low-Power RISC CPU
Core With High-Performance Peripherals
Integrated Flash Memory Eliminates the Need
for External Configuration EEPROM
Measures Charge Flow Using a High
Resolution 16-Bit Integrating Converter
鈭?Better Than 3-nVh of Resolution
鈭?Self-Calibrating
鈭?Offset Error Less Than 1-碌V
Uses 16-Bit Delta Sigma Converter for
Accurate Voltage and Temperature
Measurements
APPLICATIONS
D
Notebook PCs
DESCRIPTION
The bq20851鈭扸1P2 SBS-compliant gas gauge IC for
battery pack installation maintains an accurate record of
available charge in Li-ion or Li-polymer batteries. The
bq20851鈭扸1P2 monitors capacity and other critical
parameters of the battery pack and reports the information
to the system host controller over a serial communication
bus. It is designed to work with the bq29311 analog
front-end (AFE) protection IC to maximize functionality
and safety and minimize component count and cost in
smart battery circuits. Using information from the
bq20851鈭扸1P2, the host controller can manage
remaining battery power to extend the system run time as
much as possible.
BLOCK DIAGRAM
Pack+
Charge/Discharge
Power FETs
Supply Voltage
SMBus
LDO
bq29311
bq20851鈭扸1P2
Glueless
Interface
Cell Inputs
Safety Control
Level
Translator
+
鈭?/div>
+ Li-Ion
鈭?Cells
+
鈭?/div>
Temp
Sensor
512 Bytes
Config.
Flash
EPROM
ADC
Voltage
Integrating
ADC
Coulomb
Counting
Sense
Resistor
(10 m鈩?- 20 m鈩?
Pack鈭?/div>
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright
錚?/div>
2003, Texas Instruments Incorporated

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