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BQ2010SN- Datasheet(PDF) 2 Page - Texas Instruments |
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BQ2010SN- Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 20 page  Pin Descriptions LCOM LED common output Open-drain output switches VCC to source current for the LEDs. The switch is off dur- ing initialization to allow reading of the soft pull-up or pull-down program resistors. LCOM is also high impedance when the dis- play is off. SEG1– SEG6 LED display segment outputs (dual func- tion with PROG1–PROG6) Each output may activate an LED to sink the current sourced from LCOM. PROG1– PROG2 Programmed full count selection inputs (dual function with SEG1–SEG2) These three-level input pins define the pro- grammed full count (PFC) thresholds de- scribed in Table 2. PROG3– PROG4 Gas gauge rate selection inputs (dual function with SEG3–SEG4) These three-level input pins define the scale factor described in Table 2. PROG5 Self-discharge rate selection (dual func- tion with SEG5) This three-level input pin defines the selfdischarge compensation rate shown in Ta- ble 1. PROG6 Display mode selection (dual function with SEG6) This three-level pin defines the display op- eration shown in Table 1. NC No connect 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 high side of the sense resistor. VSR <VSS indicates dis- charge, and VSR >VSS indicates charge. The effective voltage drop, VSRO, as seen by the bq2010 is VSR +VOS (see Table 5). DISP Display control input DISP high disables the LED display. DISP tied to VCC allows PROGX to connect directly to VCC or VSS instead of through a pull-up or pull-down resistor. DISP floating allows the LED display to be active during discharge or charge if the NAC registers update at a rate equivalent to |VSRO| ≥ 4mV. DISP low acti- vates the display. See Table 1. SB Secondary battery input This input monitors the single-cell voltage potential through a high-impedance resis- tive divider network for end-of-discharge voltage (EDV) thresholds, maximum charge voltage (MCV), and battery removed. EMPTY Battery empty output This open-drain output becomes high-impedance on detection of a valid end-of-discharge voltage (VEDVF) and is low following the next application of a valid charge. 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 bq2010 |
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