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 re-calibrates or “learns” battery capacity in the full course of a discharge cycle from full to empty.
The bq2040 is an integrated circuit designed to provide accurate measurement of available charge in rechargeable batteries. It supports the System Management Bus (SMBus) v1.0 protocol and Smart Battery Data commands for capacity monitoring and control.
Key features include support for NiCd, NiMH, and Li-Ion chemistries, automatic recalibration of battery capacity, and an internal temperature sensor that eliminates the need for external components. The device can drive a four-segment LED display to indicate remaining capacity in 25% increments.
The bq2040 provides accurate measurement of available charge in NiCd, NiMH, and Li-Ion batteries.
The bq2040 drives a four-segment LED display to depict battery full-to-empty in 25% increments.
The bq2040 may operate directly from three nickel chemistry cells.