BQ2040 Series
Multi-chemistry Smart battery System (SBS) 1.0 compliant gas gauge with 4 LED drivers
Manufacturer: Texas Instruments
Catalog
Multi-chemistry Smart battery System (SBS) 1.0 compliant gas gauge with 4 LED drivers
Key Features
• Provides accurate measurement of available charge in NiCd, NiMH, and Li-Ion batteriesSupports SBS v1.0 data set and two-wire interfaceMonitors charge FET in Li-Ion pack protection circuitDesigned for battery pack integration- Low operating current- Complete circuit can fit on less than 3/4 square inch of PCB spaceSupports SBS charge control commands for NiCd, NiMH, and Li-IonDrives a four-segment LED display for remaining capacity indication16-pin narrow SOICProvides accurate measurement of available charge in NiCd, NiMH, and Li-Ion batteriesSupports SBS v1.0 data set and two-wire interfaceMonitors charge FET in Li-Ion pack protection circuitDesigned for battery pack integration- Low operating current- Complete circuit can fit on less than 3/4 square inch of PCB spaceSupports SBS charge control commands for NiCd, NiMH, and Li-IonDrives a four-segment LED display for remaining capacity indication16-pin narrow SOIC
Description
AI
The bq2040 Gas Gauge IC With SMBus Interface is intended for battery-pack or in-system installation 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 Management 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 information stored in external EEPROM. The bq2040 also automatically recalibrates or \x93learns\x94 battery capacity 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 external transistor, a simple, inexpensive regulator can be built to provide VCCfor other battery cell configurations.
An external EEPROM is used to program initial values into the bq2040 and is necessary for proper operation.
The bq2040 Gas Gauge IC With SMBus Interface is intended for battery-pack or in-system installation 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 Management 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 information stored in external EEPROM. The bq2040 also automatically recalibrates or \x93learns\x94 battery capacity 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 external transistor, a simple, inexpensive regulator can be built to provide VCCfor other battery cell configurations.
An external EEPROM is used to program initial values into the bq2040 and is necessary for proper operation.
