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SBS v1.1 Compliant Gas Gauge for Use With the bq29330
Texas Instruments
Description
The bq20z90 SBS-compliant gas gauge IC, incorporating patented Impedance Track™ technology, is designed for battery-pack or in-system installation. The bq20z90 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z90 monitors capacity change, battery impedance, open-circuit voltage, 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 bq29330 analog front-end (AFE) protection IC to maximize functionality and safety, and minimize component count and cost in smart battery circuits.The Impedance Track technology continuously analyzes the battery impedance, resulting in superior gas-gauging accuracy. This enables remaining capacity to be calculated with discharge rate, temperature, and cell aging all accounted for during each stage of every cycle.
Features
Patented Impedance Track™ Technology Accurately Measures Available Charge in Li-Ion and Li-Polymer BatteriesBetter than 1% Error Over Lifetime of the BatteryInstant Accuracy — No Learning Cycle RequiredAutomatically adjusts for battery aging, battery self discharge and temperature inefficienciesSupports the Smart Battery Specification SBS V1.1Works With the TI bq29330 Analog Front-End (AFE) Protection IC to Provide Complete Pack Electronics SolutionFull Array of Programmable Voltage, Current, and Temperature Protection FeaturesIntegrated Time Base Removes Need for External Crystal with Optional Crystal InputElectronics for 7.2-V, 10.8-V or 14.4-V Battery Packs With 50% Fewer External ComponentsBased on a Powerful Low-Power RISC CPU Core With High-Performance PeripheralsIntegrated Field Programmable FLASH Memory Eliminates the Need for External Configuration MemoryMeasures Charge Flow Using a High-Resolution, 16-Bit Integrating Delta-Sigma Converter Better Than 0.65 nVh of ResolutionSelf-CalibratingUses 16-Bit Delta-Sigma Converter for Accurate Voltage and Temperature MeasurementsExtensive Data Reporting Options For Improved System InteractionOptional Pulse Charging Feature for Improved Charge TimesDrives 3-, 4- or 5-Segment LED Display for Remaining Capacity IndicationSupports SHA-1 AuthenticationLifetime Data Logging30-Pin TSSOP (DBT)APPLICATIONSNotebook PCsMedical and Test EquipmentPortable Instrumentation IMPEDANCE TRACK is a trademark of Texas Instruments.
Related Datasheets
| Part Number | Description | Category |
| • BQ20Z75 | SBS 1.1-COMPLIANT GAS GAUGE AND PROTECTION-ENABLED IC W/IMPEDANCE TRACK (Rev. A) | ICs, Interface |
| • BQ20Z90-V110 | SBS v1.1 Compliant Gas Gauge for Use With the bq29330 | ICs, Interface |
| • BQ20Z95 | SBS 1.1-Compliant Gas Gauge Enabled w/Impedance Track (Rev. A) | ICs, Interface |
| • BQ27500 | System-Side Impedance-Track Fuel Gauge (Rev. C) | ICs, Interface |
| • BQ29330 | 2, 3-, 4-Cell Lithium-Ion or Lithium-Polymer Battery Protection AFE (Rev. B) | ICs, Interface |
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