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BQ2012 Datasheet(PDF) 3 Page - Texas Instruments |
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BQ2012 Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 26 page  Functional Description General Operation The bq2012 determines battery capacity by monitoring the amount of charge input to or removed from a re- chargeable battery. The bq2012 measures discharge and charge currents, estimates self-discharge, monitors the battery for low-battery voltage thresholds, and compen- sates for temperature and charge/discharge rates. The charge measurement is made by monitoring the voltage across a small-value series sense resistor between the negative battery terminal and ground. The available battery charge is determined by monitoring this voltage over time and correcting the measurement for the envi- ronmental and operating conditions. Figure 1 shows a typical battery pack application of the bq2012 using the LED display capability as a charge- state indicator. The bq2012 can be configured to display capacity in either a relative or an absolute display mode. The relative display mode uses the last measured dis- charge capacity of the battery as the battery “full” refer- ence. The absolute display mode uses the programmed full count (PFC) as the full reference, forcing each seg- ment of the display to represent a fixed amount of charge. A push-button display feature is available for momentarily enabling the LED display. The bq2012 monitors the charge and discharge currents as a voltage across a sense resistor (see RS in Figure 1). A filter between the negative battery terminal and the SR pin may be required if the rate of change of the bat- tery current is too great. 3 bq2012 FG201201.eps SEG6/PROG6 SEG5/PROG5 SEG4/PROG4 SEG3/PROG3 SEG2/PROG2 SEG1/PROG1 SR DISP SB VCC REF bq2012 Gas Gauge IC LCOM VSS EMPTY DQ VCC C1 0.1 F Q1 ZVNL110A R1 RS RB1 RB2 Load Charger Indicates optional. Directly connect to VCC across 3 or 4 cells (3 to 4.8V nominal,should not exceed 6.5V) with a resistor and a Zener diode to limit voltage during charge. Otherwise, R1, C1, and Q1 are needed for regulation of >4 cells. The value of R1 depends on the number of cells. Programming resistors (6 max.) and ESD-protection diodes are not shown. R-C on SR may be required (application-specific), where the R should not exceed 100k. VCC CHG 1M Figure 1. Battery Pack Application Diagram—LED Display Not Recommended For New Designs |
Similar Part No. - BQ2012_15 |
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Similar Description - BQ2012_15 |
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