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BQ2002DSNG4 Datasheet(PDF) 4 Page - Texas Instruments |
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BQ2002DSNG4 Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 17 page  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 ther- mistor placed in proximity to the battery may be used as a low-cost temperature-to-voltage transducer. The tempera- ture sense voltage input at TS is developed using a resistor-thermistor network between VCC and VSS. See Figure 1. Starting A Charge Cycle Either of two events starts a charge cycle (see Figure 5): 1. Application of power to VCC or 2. Voltage at the BAT pin falling through the maximum cell voltage where VMCV =2V ±5% If the battery is within the configured temperature and voltage limits, the IC begins fast charge. The valid bat- tery voltage range is VBAT <VMCV. The valid tempera- ture range is VHTF <VTS <VLTF for the bq2002T and VHTF <VTS for the bq2002D where VLTF = 0.4 ∗ VCC ±5% VHTF = 0.25 ∗ VCC ±5% (bq2002T only) If the battery voltage or temperature is outside of these limits, the IC pulse-trickle charges until the tempera- ture falls within the allowed fast charge range or a new charge cycle is started. Fast charge continues until termination by one or more of the four possible termination conditions: n Rate of temperature rise n Maximum voltage n Maximum temperature n Maximum time T/ t Termination The bq2002D/T samples at the voltage at the TS pin ev- ery 19s and compares it to the value measured three samples earlier. If the voltage has fallen 25.6mV or more, fast charge is terminated. The ∆T/∆t termination test is valid only when VTCO <VTS <VLTF for the bq2002T and VTCO <VTS for the bq2002D. Temperature Sampling A sample is taken by averaging together 16 measure- ments taken 570 µs apart. The resulting sample period (18.18ms) filters out harmonics around 55Hz. This tech- 4 bq2002D/T OSC TM CC LED VCC VSS BAT INH Clock Phase Generator Timing Control Sample History A to D Converter MCV Check Power Down TS Bd2002TD.eps Voltage Reference Power-On Reset TCO Check HTF/ LTF Check Charge-Control State Machine T/ t ALU Figure 4. Block Diagram |
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