bq219XL

The bq219XL Smart Battery Module provides a complete solution for the design of intelligent battery packs. The bq219XL uses the SMBus protocol and supports the Smart Battery Data commands in the SMB/SBD specifications. Designed for battery pack integration, the bq219XL combines the bq2092 or bq2040 Gas Gauge IC with a serial EEPROM on a small printed circuit board. The board includes all the necessary components to accurately monitor battery capacity and communicate critical battery parameters to the host system or battery charger. The bq219XL also includes four LEDs. The push-button switch activates the LEDs to show remainingbatterycapacityin25%increments.


Contacts are provided on the bq219XL for direct connection to the battery stack (B+, B-) and the two-wire inter-face (C, D). Please refer to the bq2092 or bq2040 data sheet for specific information on the operation of the Gas Gaugeandcommunicationinterface.


Unitrode configures the bq219XL based on the informapack voltage, capacity, and chemistry and charge controlparameters. The Smart Battery Module uses the onboard sense resistor to track charge and discharge ac-tivity of the battery pack. Figure 1 shows how the module connects to the cells.


A module development kit is also available for the bq219XL. The bq219XLB-KT includes one configured moduleandthefollowing:
1) An EV2200-92 or EV2200-40 interface board that allows connection to the serial port of any AT-compatiblecomputer.
2) Menu-driven software to display charge/discharge activity and to allow user interface to the Gas Gauge IC and serial E² PROM from any standard Windows95or3.1xPC.