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BQ2011K Datasheet(PDF) 1 Page - Texas Instruments |
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BQ2011K Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 20 page  1 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 bq2011K Gas Gauge IC is in- tended for battery-pack installation to maintain an accurate record of a bat- tery’s available charge. The IC moni- tors a voltage drop across a sense re- sistor connected in series between the negative battery terminal and ground to determine charge and discharge ac- tivity of the battery. The bq2011K 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 PROG1-4 and SPFC 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 graphically indicate nominal available charge. The bq2011K supports a simple single-line bidirectional serial link to an external processor (common ground). The bq2011K outputs bat- tery information in response to exter- nal commands over the serial link. To support subassembly testing, the outputs may also be controlled by command. The external processor may also overwrite some of the bq2011K gas gauge data registers. The bq2011K may operate directly from four cells. With the REF out- put 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. LCOM LED common output SEG1/PROG1 LED segment 1/ Program 1 input SEG2/PROG2 LED segment 2 / Program 2 input SEG3/PROG3 LED segment 3/ Program 3 input SEG4/PROG4 LED segment 4/ Program 4 input SEG5 LED segment 5 SPFC 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 Gas Gauge IC for High Discharge Rates bq2011K 10/97 B Pin Connections Pin Names 1 PN2011JK.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 LCOM SEG1/PROG1 SEG2/PROG2 SEG3/PROG3 SEG4/PROG4 SEG5 SPFC VSS |
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