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BQ24401P Datasheet(PDF) 5 Page - Texas Instruments |
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BQ24401P Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 15 page  Initial Hold-Off Period The values of the external resistor and capacitor con- nected to pin RC set the initial hold-off period. During this period, the bq24401 avoids early termination by dis- abling the ∆T/∆t feature. This period is fixed at the pro- grammed value of the maximum charge time divided by 32. hold-off period = maximum time - out 32 5 bq24401 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 bq24401 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 6 Table 2. Summary of NiCd or NiMH Charging Characteristics Temperature Condition Action VTS >VLTF Cold battery—checked at all times Suspends fast charge or top-off and timer Allows trickle charge—LED flashes at 1Hz rate during pre-charge qualification and fast charge VHTF <VTS <VLTF Optimal operating range Allows charging VTS <VHTF Hot battery—checked during charge qualifi- cation and top-off and trickle-charge Suspends fast-charge initiation, does not allow trickle charge—LED flashes at 1Hz rate during pre-charge qualification VTS <VTCO Battery exceeding maximum allowable tem- perature—checked at all times Terminates fast charge or top-off Table 3. Temperature-Monitoring Conditions Table 4. Charge Status Display Charge Action State LED Status Battery absent High impedance Pre-charge qualification 1Hz flash Trickle charge (before fast charge) 1Hz flash Fast charging Low Top-off or trickle High impedance Charge complete High impedance Sleep mode High impedance Charge suspended (VTS >VLTF) 1Hz flash |
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