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BQ2040 Datasheet(PDF) 1 Page - Texas Instruments |
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BQ2040 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 36 page 1 Features ® Provides accurate measurement of available charge in NiCd, NiMH, and Li-Ion batteries ® Supports SBS v1.0 data set and two-wire interface ® Monitors charge FET in Li-Ion pack protection circuit ® Designed for battery pack inte- gration - Low operating current - Complete circuit can fit on less than ¾ square inch of PCB space ® Supports SBS charge control commands for NiCd, NiMH, and Li-Ion ® Drives a four-segment LED dis- play for remaining capacity indication ® 16-pin narrow SOIC General Description The bq2040 Gas Gauge IC With SMBus Interface is intended for battery-pack or in-system installa- tion to maintain an accurate record of available battery charge. The bq2040 directly supports capacity monitoring for NiCd, NiMH, and Li- Ion battery chemistries. The bq2040 uses the System Man- agement Bus v1.0 (SMBus) protocol and supports the Smart Battery Data (SBData) commands. The bq2040 also supports the SBData charge control functions. Battery state-of-charge, remaining capacity, remaining time, and chemistry are available over the serial link. Battery-charge state can be directly indicated using a four-segment LED display to graphically depict battery full-to-empty in 25% increments. The bq2040 estimates battery self- discharge based on an internal timer and temperature sensor and user-programmable rate informa- tion stored in external EEPROM. The bq2040 also automatically re- calibrates or “learns” battery capac- ity in the full course of a discharge cycle from full to empty. The bq2040 may operate directly from three nickel chemistry cells. With the REF output and an exter- nal transistor, a simple, inexpensive regulator can be built to provide VCC for other battery cell configu- rations. An external EEPROM is used to program initial values into the bq2040 and is necessary for proper operation. bq2040 Gas Gauge IC With SMBus Interface VCC 3.0–6.5V ESCL EEPROM clock ESDA EEPROM data LED1-4 LED segment 1-4 VSS System ground SR Sense resistor input DISP Display control input 1 PN204001.eps 16-Pin Narrow SOIC 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC ESCL ESDA LED1 LED2 LED3 LED4 VSS VOUT REF SMBC SMBD PSTAT SB DISP SR SB Battery sense input PSTAT Protector status input SMBD SMBus data input/output SMBC SMBus clock REF Voltage reference output VOUT EEPROM supply output SLUS005–JUNE 1999 E Pin Connections Pin Names Not Recommended For New Designs |
Similar Part No. - BQ2040_15 |
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Similar Description - BQ2040_15 |
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