bq2092

The bq2092 Gas Gauge IC With SMBus-Like Interface is intended for battery-pack or in-system installation to maintain an accurate record of available battery charge. The bq2092 directly supports capacity monitoring for NiCd, NiMH, and Li-Ionbatterychemistries.


The bq2092 uses the SMBus protocol that supports many of the Smart Battery Data (SBData) commands.The bq2092 also supports SBData charge control. Battery state-of-charge, capacity remaining, 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-emptyin25%increments.


The bq2092 estimates battery selfdischarge based on an internal timer and temperature sensor and user-programmable rate information stored in external EEPROM. The bq2092 also automatically recalibrates or "learns" battery capacity in the full course of a dischargecyclefromfulltoempty.


The bq2092 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 V_CC forotherbattery cellconfigurations.


An external EEPROM is used to program initial values into the bq2092 and is necessary for proper operation.