Texas Instruments Incorporated (NYSE: TXN - News; TI) today introducedseveral new battery management integrated circuits (ICs), including itsnext-generation Impedance Track(TM) "gas gauge" chipset, to improve batteryperformance and protect multi-cell, lithium-based battery packs used innotebooks and other systems.
Next-Generation Impedance Track Gas Gauge
TI's bq20z90 next-generation Impedance Track battery gas gauge chipset, whichintegrates new state-of-the-art battery authentication technology, is designedto work with TI's newest analog front end (AFE) protection IC. Requiring a thirdfewer components than its predecessor, the 99-percent accurate bq20z90 chipsetwas designed with ease-of-use and smallest real estate in mind. The gas gaugeclosely monitors battery capacity, impedance, cell balance, open-circuit voltageand other critical parameters of a 7.2-V, 10.8-V or 14.4-V battery pack andreports the information to the system host controller over aserial-communication bus. See: http://www.ti.com/sc06160 .
TI's Impedance Track gas gauge technology, launched in 2004 with the bq20z80chipset, precisely measures changes in impedance, or resistance caused bybattery age, temperature and cycle life, to accurately predict run-time ofbattery packs with two, three and four cells in series. An exact "startingposition" is determined for instant state-of-charge, and total capacity iscalculated from the amount of capacity that exists, which eliminates the needfor a full-charge and discharge cycle.
The bq20z90 drives a three-, four- or five-segment LED display for remainingcapacity indication. For those designs that do not require the displayindicator, TI also introduced its bq20z70 gas gauge chipset without the LEDdisplay driver.
Front-End Battery Protection
The bq20z90 is designed to work with TI's new bq29330 AFE protection circuitwith two integrated linear dropout regulators (LDOs) to further maximizefunctionality and reduce external component count. The device utilizes an I2Ccommunications interface to allow the bq20z90 to monitor safety batteryconditions such as voltage, individual cell voltages and cell- balancing data,and report the information to the host system. See: http://www.ti.com/sc06160b .
A designer can program critical safety parameters such as current protectionthresholds and delays into the bq29330 to increase flexibility of the batterymanagement system. The device also provides protection for overloadshort-circuit in charge and discharge conditions, while providing battery cellover-voltage and under-voltage protection.
Integrated SHA-1 Based Authentication
The bq20z90 integrates SHA-1, 128-bit decryption functionality, which easilyidentifies potentially unsafe batteries not approved by original equipmentmanufacturers for use in their devices. If the battery information checks out,the system can allow normal system operation with the battery pack. Amanufacturer can program the system to take action to protect the consumer ifthe battery pack response is not correct, or if the battery pack is not approvedor determined to be defective. In addition, TI introduced a bq26100 protectiondevice for those designers who prefer a discrete implementation of the SHA-1protection feature. See: http://www.ti.com/sc06160c .
Smart Battery Test Board
In addition to the new battery gas gauge chipset, TI has developed a uniquedevelopment platform aimed at battery pack suppliers. TI's new bqMTester smartbattery development board simplifies production of battery modules at a fractionof the cost. bqMTester eliminates the need for an onboard computer and expensivecalibration/traceable power supplies and electronic loads. It calibrates andprograms electronic smart battery modules based on advanced battery fuel gauges,such as the bq20z90, bq20z80 and bq20z70 devices with Impedance Track. Inaddition, bqMTester makes tracking battery modules in production easier byprogramming serial number, date, pack lot code and other defaults. The bqMTesterboard can be ordered at http://www.ti.com/bqmtester .
Pricing and Availability
The bq20z90 and bq20z70 gas gauge chipsets, bq29330 protection AFE and bq26100authentication circuit are available in volume production from TI and itsauthorized distributors. The bq20z90 is packaged in a 30-pin thin shrink smalloutline package (TSSOP), the smaller bq29z70 in a 20-pin TSSOP, the bq29330 in a30-pin TSSOP package and the bq26100 in a tiny, 6-pin SON package. Suggestedresale pricing in 1,000 piece quantities is $ 3.30 for the bq20z90, $ 2.90 for thebq20z70, $ 1.45 for the bq29330, and $ 1.30 for the bq26100.
Evaluation modules for the bq20z90 gas gauge chipset, the bqMTester developmentboard, reference designs, application notes and technical documentation areavailable through http://www.ti.com/impedancetrack .
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