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BQ24400 Datasheet(PDF) 9 Page - Texas Instruments |
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BQ24400 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 15 page  Temperature Monitoring The bq24400 measures the temperature by the voltage at the TS pin. This voltage is typically generated by a nega- tive-temperature-coefficient thermistor. The bq24400 compares this voltage against its internal threshold voltages to determine if charging is safe. These thresholds are the following: l High-temperature cutoff voltage: VTCO = 0.225 ∗ VCC This voltage corresponds to the maximum temperature (TCO) at which fast charging is allowed. The bq24400 terminates fast charge if the voltage on pin TS falls below VTCO. l High-temperature fault voltage: VHTF = 0.25 ∗ VCC This voltage corresponds to the temperature (HTF) at which fast charging is allowed to begin. l 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 bq24400 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 3 summarizes these various conditions. Charge Status Display The charge status is indicated by open-drain output LED. Table 4 summarizes the display output of the bq24400. Sleep Mode The bq24400 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 bq24400 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. 9 bq24400 2000TCS.eps BAT- Power Supply ground bq2000 ground SNS RSNS Rf Cf 1 2 VSS bq2000T Figure 8. Current-Sensing Circuit bq24400 bq24400 |
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Similar Description - BQ24400 |
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