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BQ2004H Datasheet(PDF) 3 Page - Texas Instruments |
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BQ2004H Datasheet(HTML) 3 Page - Texas Instruments |
3 / 18 page Functional Description Figure 2 shows a block diagram and Figure 3 shows a state diagram of the bq2004E/H. 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 two-cell potential for the battery under charge. A resistor-divider ratio of: RB1 RB2 = N 2 - 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 1MΩ. 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. Both the BAT and TS inputs are referenced to SNS, so the signals used inside the IC are: VBAT -VSNS =VCELL and VTS -VSNS =VTEMP Discharge-Before-Charge The DCMD input is used to command discharge-before- charge via the DIS output. Once activated, DIS becomes active (high) until VCELL falls below VEDV, at which time DIS goes low and a new fast charge cycle begins. The DCMD input is internally pulled up to VCC (its inac- tive state). Leaving the input unconnected, therefore, results in disabling discharge-before-charge. A negative going pulse on DCMD initiates discharge-before-charge at any time regardless of the current state of the bq2004. If DCMD is tied to VSS, discharge-before-charge will be the first step in all newly started charge cycles. Starting A Charge Cycle A new charge cycle is started by: 1. Application of VCC power. 2. VCELL falling through the maximum cell voltage, VMCV where: VMCV = 0.8 ∗ VCC ± 30mV 3. A transition on the INH input from low to high. If DCMD is tied low, a discharge-before-charge will be executed as the first step of the new charge cycle. Oth- erwise, pre-charge qualification testing will be the first step. The battery must be within the configured temperature and voltage limits before fast charging begins. The valid battery voltage range is VEDV <VBAT <VMCV where: VEDV = 0.4 ∗ VCC ± 30mV 3 bq2004E/H Fg2004a.eps N T C bq2004E/H VCC PACK + PACK - TS SNS RT1 RT2 RB2 RB1 bq2004E/H Negative Temperature Coefficient Thermister PACK+ PACK- BAT SNS Figure 1. Voltage and Temperature Monitoring |
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