bq2110

The bq2110 Gas Gauge Module provides a complete and compact solution for capacity monitoring of NiCd and NiMH battery packs. Designed for battery pack integra-tion, the bq2110 incorporates a bq2010 Gas Gauge IC, a current sense resistor, and all other components necessary to accurately monitor and display the capacity of 4 to 12 series cells. The bq2110L includes six surfacemounted LEDs to display remaining capacity in 20% increments of the learned capacity (relative mode) or programmed capacity (absolute mode). The sixth LED is used in absolute mode to represent an overfull condition (charge above the programmed capacity). The LEDs are activatedwiththeonboardpush-buttonswitch.


Contacts are provided on the bq2110 for direct connection to the battery stack (BAT+, BAT-), the serial communications port (DQ), and the empty indicator (EMPTY). Please refer to the bq2010 data sheet for the specificsontheoperationoftheGasGauge.


Unitrode configures the bq2110 based on the information requested in Table 1. The configuration defines the number of series cells, the nominal battery pack capacity,theself-dischargerate,andtheLEDdisplaymode.


A module development kit is also available for the bq2110. The bq2110B-KT or bq2110LB-KT includes one configuredmoduleandthefollowing:
1) An interface board that allows connection to the serialportofanAT-compatiblecomputer.
2) Menu-driven software with the bq2110 to display charge/discharge activity and to allow user interfacetothebq2010fromanystandardDOSPC.
3) SourcecodefortheTSR.