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Battery Management Chipset from TI Boosts Performance for Notebook PCs, Handheld Terminals, Medical and Test Equipment
Highly Integrated, Flexible Solution Cuts Component Count By 40 Percent
DALLAS (Oct. 1, 2001) - Providing a high-performance battery management solution while minimizing component count, cost and board space, Texas Instruments (TI) (NYSE: TXN) introduced its first chipset for capacity monitoring and safety protection in Li-Ion or Li-Polymer battery packs. Designed for battery pack integration, the chipset provides all the necessary functionality required for accurate battery capacity monitoring and primary safety control and voltage balancing of the Li-Ion cells. Thanks to its high integration and minimal external component requirements, the chipset is ideal for use in notebook computers, handheld terminals, medical and test equipment, and other portable equipment powered by three or four series Li-Ion or Li-Polymer battery packs. (See power.ti.com/aap6843u).
The battery management chipset consists of the bq2081 Smart Battery System (SBS version 1.1) Gas Gauge IC and the bq29311 Li-Ion Protector IC. As a chipset, the bq2081/bq29311 solution simplifies the design and reduces the number of components required for a Li-Ion SBS-compatible battery fuel gauge and protection circuit by as much as 40 percent compared to previous generations or competitive solutions. As a result, the bq2081/bq29311 circuit can fit in less than one square inch of PCB space.
New Battery Management Platform Offers Enhanced Performance Level
The bq2081 is the first in a series of battery capacity monitoring ICs based on TI's new Cool-GGÔ low-power platform. Optimized for battery management, the platform integrates an 8-bit RISC CPU core, FLASH EPROM configuration memory, two communication ports, safety control outputs and two high-performance analog-to-digital (ADC) converters. The devices offer a new level of performance that further improves the accuracy and resolution of battery parameter measurements versus those incorporated on other platforms.
For battery capacity measurements, the bq2081 employs a continuous self-calibrating integrated ADC. The converter has a resolution better than 3nVh with a calibrated measurement offset error of 1micro-V (typical). The high resolution and low offset error allow the use of a low value sense resistor (10mohm) for accurate charge and discharge integration of the wide range of currents found in today's portable applications. For temperature, instantaneous current, and battery voltage, the bq2081 uses a second 15-bit delta-sigma converter. The new analog peripherals, together with TI's proprietary cell modeling algorithms and the RISC processor core, allow the bq2081 to achieve greater than one percent accuracy in its capacity and run-time calculations.
In addition, the bq29311 serves as the Li-Ion cell protector and analog front end to the bq2081. Accepting an input voltage of up to 25V, the bq29311 runs directly off the battery stack voltage and provides a regulated 3.3V to the bq2081, sources LED current for capacity indication and provides bias current for the temperature sense network.
Furthermore, the bq2081 communicates to the bq29311 over a two-wire serial bus. The bq29311 provides requested voltage signals to the bq2081 that the bq2081 then uses for voltage calculations, safety determinations and cell balancing requirements. The bq29311 also controls the charge and discharge FETs and can change the state of the FETS for safety protection autonomously or under bq2081 control.
Additional features include a SBS version 1.1 compatible data set and communication protocol with Packet Error Checking, as well as complete Li-Ion protection, including programmable thresholds for over-voltage/under-voltage, over-current (charge and discharge), short circuit, over-temperature and cell balancing.
Availability, Packaging, Pricing
Samples of the bq2081 and bq29311 will be available in November with volume production planned for December 2001. The bq2081 is packaged in a 38-pin TSSOP (DBT) while the bq29311 is supplied in a 24-pin TSSOP (PW). Suggested resale pricing in quantities of 1,000 is $4.05 for the bq2081 and $1.20 for the bq29311.
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