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BQ2000TS Datasheet(PDF) 10 Page - Texas Instruments |
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BQ2000TS Datasheet(HTML) 10 Page - Texas Instruments |
10 / 18 page n High-temperature fault voltage: VHTF = 0.25 ∗ VCC This voltage corresponds to the temperature (HTF) at which fast charging is allowed to begin. n Low-temperature fault voltage: VLTF = 0.5 ∗ VCC This voltage corresponds to the minimum temperature (LTF) at which fast charging or top-off is allowed. If the voltage on pin TS rises above VLTF, the bq2000 suspends fast charge or top-off but does not terminate charge. When the voltage falls back below VLTF, fast charge or top-off resumes from the point where suspended. Trickle-charge is allowed during this condition. Table 4 summarizes these various conditions. Charge Status Display The charge status is indicated by open-drain output LED. Table 5 summarizes the display output of the bq2000. Sleep Mode The bq2000 features a sleep mode for low power con- sumption. This mode is enabled when the voltage at pin BAT is above the low-power-mode threshold, VSLP. Dur- ing sleep mode, the bq2000 shuts down all internal cir- cuits, drives the LED output to high-impedance state, and drives pin MOD to low. Restoring BAT below the VMCV threshold initiates the IC and starts a fast-charge cycle. 10 bq2000 Table 5. 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 (after fast charge, NiCd, NiMH only) High impedance Charge complete High impedance Sleep mode High impedance Charge suspended (VTS >VLTF) 1Hz flash 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 quali- fication and top-off and trickle-charge Suspends fast-charge initiation, does not allow trickle charge—LED flashes at 1Hz rate during pre-charge qualification and fast charge VTS <VTCO Battery exceeding maximum allowable temperature—checked at all times Terminates fast charge or top-off Table 4. Temperature-Monitoring Conditions 2000CS.eps BAT- Power Supply ground bq2000 ground SNS RSNS Rf Cf 1 2 VSS bq2000 Figure 9. Current-Sensing Circuit |
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