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BQ2011K Datasheet(PDF) 2 Page - Texas Instruments |
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BQ2011K Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 20 page  Pin Descriptions LCOM LED common Open-drain output switches VCC to source cur- rent for the LEDs. The switch is off during ini- tialization to allow reading of PROG1-4 pull-up or pull-down program resistors. LCOM is high impedance when the display is off. SEG1– SEG5 LED display segment outputs Each output may activate an LED to sink the current sourced from LCOM, the battery, or VCC. PROG1– PROG4 Programmed full count selection inputs (dual function with SEG1 - SEG4) These three-level input pins define the pro- grammed full count (PFC) in conjunction with SPFC pin, define the display mode and enable or disable self-discharge. SPFC Programmed full count selection input This three-level input pin along with PROG1-3 define the programmed full count (PFC) thresholds described in Table 1. The state of the SPFC pin is only read immediately after a reset condition. SR Sense resistor input The voltage drop (VSR) across the sense re- sistor RS is monitored and integrated over time to interpret charge and discharge activ- ity. The SR input is tied to the low side of the sense resistor and battery pack ground (see Figure 1). VSR >VSS indicates discharge, and VSR <VSS indicates charge. The effec- tive voltage drop, VSRO, as seen by the bq2011K is VSR +VOS (see Table 4). NC No connect DISP Display control input DISP floating allows the LED display to be active during certain charge and dis- charge conditions. Transitioning DISP low activates the display for 4 ± 0.5 seconds. SB Secondary battery input This input monitors the single-cell voltage potential through a high-impedance resis- tive divider network for the end-of-discharge voltage (EDV) threshold and maximum cell voltage (MCV). RBI Register backup input This input is used to provide backup poten- tial to the bq2011K registers during periods when VCC < 3V. A storage capacitor should be connected to RBI. DQ Serial I/O pin This is an open-drain bidirectional pin. REF Voltage reference output for regulator REF provides a voltage reference output for an optional micro-regulator. VCC Supply voltage input VSS Ground 2 bq2011K |
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