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BQ2011 Datasheet(PDF) 1 Page - Texas Instruments |
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BQ2011 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 20 page  Features ➤ Conservative and repeatable measurement of available charge in rechargeable batteries ➤ Designed for portable equipment such as power tools with high dis- charge rates ➤ Designed for battery pack inte- gration - 120µA typical standby current (self-discharge estimation mode) - Small size enables imple- mentations in as little as 1 2 square inch of PCB ➤ Direct drive of LEDs for capacity display ➤ Self-discharge compensation us- ing internal temperature sensor ➤ Simple single-wire serial commu- nications port for subassembly testing ➤ 16-pin narrow SOIC General Description The bq2011 Gas Gauge IC is intended for battery-pack installation to main- tain an accurate record of available battery charge. The IC monitors a voltage drop across a sense resistor connected in series between the nega- tive battery terminal and ground to determine charge and discharge ac- tivity of the battery. The bq2011 is designed for systems such as power tools with very high discharge rates. Battery self-discharge is estimated based on an internal timer and tem- perature sensor. Compensations for battery temperature and rate of charge or discharge are applied to the c harge , disc harge , and selfdischarge calculations to provide available charge information across a wide range of operating conditions. Initial battery capacity is set using the PFC and MODE pins. Actual battery capacity is automatically “learned” in the course of a dis- charge cycle from full to empty and may be displayed depending on the display mode. Nominal available charge may be di- rectly indicated using a five-seg- ment LED display. These segments are used to indicate graphically the nominal available charge. The bq2011 supports a simple single- line bidirectional serial link to an exter- nal processor (common ground). The bq2011 outputs battery information in response to external commands over the serial link. To support subassembly testing, the outputs may also be con- trolled by command. The external proc- essor may also overwrite some of the bq2011 gas gauge data registers. The bq2011 may operate directly from four cells. With the REF output and an external transistor, a simple, inexpensive regulator can be built to provide VCC from a greater number of cells. Internal registers include available charge, temperature, capacity, battery ID, and battery status. 1 Gas Gauge IC for High Discharge Rates 2/96 E Pin Connections Pin Names 1 PN201101.eps 16-Pin Narrow SOIC 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC REF NC DQ RBI SB DISP SR MODE SEG1 SEG2 SEG3 SEG4 SEG5 PFC VSS MODE Display mode output SEG1 LED segment 1 SEG2 LED segment 2 SEG3 LED segment 3 SEG4 LED segment 4 SEG5 LED segment 5 PFC Programmed full count selection input REF Voltage reference output NC No connect DQ Serial communications input/output RBI Register backup input SB Battery sense input DISP Display control input SR Sense resistor input VCC 3.0–6.5V VSS Negative battery terminal bq2011 |
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