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BQ2111LB-XXX Datasheet(PDF) 1 Page - Texas Instruments |
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BQ2111LB-XXX Datasheet(HTML) 1 Page - Texas Instruments |
1 / 7 page Features ä Complete bq2011 Gas Gauge solution for NiCd packs in high discharge rate applications ä Five surface-mounted LEDs to display state-of-charge information ä Battery state-of-charge monitoring for 4- to 12-cell series applications ä On-board regulator allows direct connection to the battery ä Battery information available over a single-wire bidirectional serial port ä Nominal capacity pre-configured ä Compact size for battery pack integration General Description The bq2111L Gas Gauge Module provides a complete and compact solution for capacity monitoring of NiCd battery packs in high discharge rate applications such as power tools. Designed for battery pack integration, the bq2111L incorporates a bq2011 Gas Gauge IC, five surface-mounted LEDs, and the other discrete compo- nents necessary to monitor and display accurately the capacity of 4 - to 12-series cells. The only external compo- nent required is a low-value sense resistor connected be- tween GND and PACK-. Contacts are also provided on the bq2111L for direct connection to the battery stack and the serial communications port (DQ). The battery stack should be connected between BAT+ and GND. Please refer to the bq2011 data sheet for the specifics on the operation of the Gas Gauge. Unitrode configures the bq2111L based on the informa- tion requested in Table 1. The configuration defines the number of series cells and the nominal battery pack ca- pacity. The bq211L module uses the absolute LED dis- play to indicate battery capacity. In this mode, the remaining capacity is represented as a percentage of the programmed capacity. The bq2111L can operate directly from four series cells within the pack using the LBAT+ supply input. For four series cell applications or applications using the on- board regulator, LBAT+ should be connected to BAT+. Please refer to Figure 1 for module connection illustra- tions. A module development kit is also available for the bq2111L. The bq2111LB-KT includes one configured module and the following: 1) An interface board that allows connection to the se- rial port of an AT-compatible computer. 2) Menu-driven software with the bq2111L to display charge/discharge activity and to allow user inter- face to the bq2011 from any standard DOS PC. 3) Source code for the TSR. Pin Descriptions P1 DQ/Serial communication port P2 BAT+/Battery positive/Pack positive P3 LBAT+/Four--cell power P4 PACK-/Pack negative P5 GND/Ground 1 NiCd Gas Gauge Module with LEDs for High Discharge Rates bq2111L 7/96 |
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