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BQ2002PN Datasheet(PDF) 2 Page - Texas Instruments |
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BQ2002PN Datasheet(HTML) 2 Page - Texas Instruments |
2 / 17 page Pin Descriptions TM Timer mode input A three-level input that controls the settings for the fast charge safety timer, voltage ter- mination mode, top-off, pulse-trickle, and voltage hold-off time. LED Charging output status Open-drain output that indicates the charging status. BAT Battery input voltage The battery voltage sense input. The input to this pin is created by a high-impedance re- sistor divider network connected between the positive and negative terminals of the battery. VSS System ground TS Temperature sense input Input for an external battery temperature monitoring thermistor. VCC Supply voltage input 5.0V ±20% power input. INH Charge inhibit input When high, INH suspends the fast charge in progress. When returned low, the IC re- sumes operation at the point where initially suspended. CC Charge control output An open-drain output used to control the charging current to the battery. CC switch- ing to high impedance (Z) enables charging current to flow, and low to inhibit charging current. CC is modulated to provide top-off, if enabled, and pulse trickle. Functional Description Figure 2 shows a state diagram and Figure 3 shows a block diagram of the bq2002/F. Battery Voltage and Temperature Measurements Battery voltage and temperature are monitored for maximum allowable values. The voltage presented on the battery sense input, BAT, should represent a single-cell potential for the battery under charge. A resistor-divider ratio of RB1 RB2 = N - 1 is recommended to maintain the battery voltage within the valid range, where N is the number of cells, RB1 is the resistor connected to the positive battery terminal, and RB2 is the resistor connected to the negative bat- tery terminal. See Figure 1. Note: This resistor-divider network input impedance to end-to-end should be at least 200k Ω and less than 1 MΩ. A ground-referenced negative temperature coefficient thermistor placed near the battery may be used as a low- cost temperature-to-voltage transducer. The temperature sense voltage input at TS is developed using a resistor- thermistor network between VCC and VSS. See Figure 1. 2 bq2002/F Fg2002/F01.eps bq2002/F BAT VSS N T C bq2002/F VCC VCC PACK + TS VSS BAT pin connection Thermistor connection TM NTC = negative temperature coefficient thermistor. RT R3 R4 RB1 RB2 Mid-level setting for TM Figure 1. Voltage and Temperature Monitoring and TM Pin Configuration |
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