Gas Gauge IC With SMBus Interface

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. By Texas Instruments
Part Manufacturer Description Datasheet Samples
BQ294504DRVT Texas Instruments Overvoltage Protection for 2-Series and 3-Series Cell Li-Ion Batteries 6-WSON -40 to 85
BQ294592DRVR Texas Instruments Overvoltage Protection Device for 2- to 3-Cell Li-Ion Batteries, with 4.30v OVP 6-WSON -40 to 85
BQ294582DRVR Texas Instruments Overvoltage Protection for 2-Series and 3-Series Cell Li-Ion Batteries, with 4.225v OVP 6-WSON -40 to 85
BQ294524DRVT Texas Instruments Overvoltage Protection for 2-Series and 3-Series Cell Li-Ion Batteries 6-WSON -40 to 85
BQ294512DRVT Texas Instruments Overvoltage Protection Device for 2- to 3-Cell Li-Ion Batteries, with 4.40v OVP 6-WSON -40 to 85
BQ294512DRVR Texas Instruments Overvoltage Protection Device for 2- to 3-Cell Li-Ion Batteries, with 4.40v OVP 6-WSON -40 to 85
BQ294532DRVR Texas Instruments Overvoltage Protection Device for 2- to 3-Cell Li-Ion Batteries, with 4.50v OVP 6-WSON -40 to 85
BQ2945SN-C409 Texas Instruments Multi-Chemistry SBS 1.0 Compliant Gas Gauge With 5 LED Drivers 16-SOIC 0 to 70
BQ2945SN-C409TR Texas Instruments Multi-Chemistry SBS 1.0 Compliant Gas Gauge With 5 LED Drivers 16-SOIC 0 to 70
BQ294522DRVR Texas Instruments Overvoltage Protection Device for 2- to 3-Cell Li-Ion Batteries, with 4.45v OVP 6-WSON -40 to 85
BQ2945 's PackagesBQ2945 's pdf datasheet



BQ2945 Pinout, Pinouts
BQ2945 pinout,Pin out
This is one package pinout of BQ2945,If you need more pinouts please download BQ2945's pdf datasheet.

BQ2945 Application circuits
BQ2945 circuits
This is one application circuit of BQ2945,If you need more circuits,please download BQ2945's pdf datasheet.


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