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BQ2000PW Datasheet(PDF) 9 Page - Texas Instruments |
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BQ2000PW Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 18 page  SNS voltage is less than VSNSLO or greater than VSNSHI, the bq2000 switches the MOD output low to shut off charging current to the battery. Figure 8 shows a typical multi-chemistry charge circuit. Temperature Monitoring The bq2000 measures the temperature by the voltage at the TS pin. This voltage is typically generated by a neg- ative-temperature-coefficient thermistor. The bq2000 compares this voltage against its internal threshold voltages to determine if charging is safe. These thresholds are the following: n High-temperature cutoff voltage: VTCO = 0.225 ∗ VCC This voltage corresponds to the maximum temperature (TCO) at which fast charging is allowed. The bq2000 terminates fast charge if the voltage on pin TS falls below VTCO. 9 bq2000 Parameter Value* Maximum cell voltage (VMCV)2V Minimum pre-charge qualification voltage (VLBAT) 950mV High-temperature cutoff voltage (VTCO) 0.225 ∗ VCC High-temperature fault voltage (VHTF) 0.25 ∗ VCC Low-temperature fault voltage (VLTF) 0.5 ∗ VCC bq2000 fast-charge maximum time out (MTO) RMTO ∗ CMTO ∗ 35,988 Fast-charge charging current (IMAX) 0.05/RSNS Hold-off period MTO/32 Top-off charging current (optional) IMAX/16 Top-off period (optional) MTO Trickle-charge frequency 1Hz Trickle-charge pulse-width See Figure 7 *Please refer to DC Thresholds Specification for details. Table 2. Summary of NiCd or NiMH Charging Characteristics Parameter Value* Maximum cell voltage (VMCV)2V Minimum pre-charge qualification voltage (VLBAT) 950mV High-temperature cutoff voltage (VTCO) 0.225 ∗ VCC High-temperature fault voltage (VHTF) 0.25 ∗ VCC Low-temperature fault voltage (VLTF) 0.5 ∗ VCC bq2000 fast-charge maximum time-out (MTO) 2 ∗ RMTO ∗ CMTO ∗ 35,988 Fast-charge charging current (IMAX) 0.05/RSNS Hold-off period MTO/32 Minimum current (for fast-charge termination) IMAX/7 Trickle-charge frequency (before fast charge only) 1Hz Trickle-charge pulse-width (before fast charge only) See Figure 7 *Please refer to DC Thresholds Specification for details. Table 3. Summary of Li-Ion Charging Characteristics |
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