bq2145

The bq2145 Smart Battery Module provides a complete solution for the design of intelligent battery packs. The bq2145 uses the SMBus protocol and supports Smart Battery Data commands in the SMB/SBD specifications. Designed for battery pack integration, the bq2145 combines the bq2945 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 bq2145 also includes five LEDs. The push-button switch activates the LEDs to show remaining battery capacity in 20% increments.


Contacts are provided on the bq2145 for direct connection to the battery stack (B+, B-) and the two-wire interface (C, D). Please refer to the bq2945 data sheet for specific information on the operation of the Gas Gauge andcommunicationinterface.


Unitrode configures the bq2145 based on the information requested in Table 1. The configuration defines the pack voltage, capacity, and chemistry and charge control parameters. The Smart Battery Module uses the onboard sense resistor to track charge and discharge activity of the battery pack. Figure 1 shows how the module connectstothecells.


A module development kit is also available for the bq2145. The bq2145B-KT or the bq2145LB-KT includes oneconfiguredmoduleandthefollowing:
1) An EV2200-45 interface board that allows connection to the serial port of any AT-compatible computer.
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.