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BQ2050SN-D119G4 Datasheet(PDF) 2 Page - Texas Instruments |
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BQ2050SN-D119G4 Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 27 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– SEG5 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 Power 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 and battery compensation fac- tors as shown in Table 1. PROG6 Capacity initialization selection This three-level pin defines the battery state of charge at reset as shown in Table 1. N/C 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 between the nega- tive terminal of the battery and the sense re- sistor. VSR <VSS indicates discharge, and VSR >VSS indicates charge. The effective voltage drop, VSRO, as seen by the bq2050 is VSR + VOS . 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 charge. DISP low activates the display. See Table 1. SB Secondary battery input This input monitors the battery cell voltage potential through a high-impedance resis- tive divider network for end-of-discharge voltage (EDV) thresholds, and battery re- moved. RBI Register backup input This pin is used to provide backup potential to the bq2050 registers during periods when VCC ≤ 3V. A storage capacitor or a battery can 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 bq2050 Not Recommended For New Designs |
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