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BQ2945SN-C409 Datasheet(PDF) 1 Page - Texas Instruments |
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BQ2945SN-C409 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 32 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 ➤ Two programmable general purpose output ports for added flexibility ➤ 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 five-segment LED dis- play for remaining capacity indication ➤ 16-pin narrow SOIC General Description The bq2945 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 bq2945 directly supports capacity monitoring for NiCd, NiMH, and Li-Ion battery chemistries. The bq2945 uses the System Man- agement Bus v1.0 (SMBus) protocol and supports the Smart Battery Data (SBData) commands. The bq2945 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 five-segment LED display to graphically depict battery full-to-empty in 20% increments. The bq2945 estimates battery self- discharge based on an internal timer and temperature sensor and user-programmable rate informa- tion stored in external EEPROM. The bq2945 also automatically re- calibrates or “learns” battery capac- ity in the full course of a discharge cycle from full to empty. The bq2945 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 configurations. An external EEPROM programs initial values into the bq2945 and is necessary for proper operation. bq2945 Gas Gauge IC with SMBus Interface VCC 3.0–6.5V LED1 LED segment 1/ EEPROM clock LED2 LED segment 2/ EEPROM data LED3 LED segment 3 LED4 LED segment 4 LED5 LED segment 5 CP1 Control pin 1 VSS System ground 1 PN294501.eps 16-Pin Narrow SOIC 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VOUT REF SMBC SMBD CP2 SB DISP SR VCC LED1/ESCL LED2/ESDA LED3 LED4 LED5 CP1 VSS SR Sense resistor input DISP Display control input SB Battery sense input CP2 Control pin 2 SMBD SMBus data input/output SMBC SMBus clock REF Voltage reference output VOUT EEPROM supply output 6/99 C Pin Connections Pin Names |
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