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BQ24401PW Datasheet(PDF) 9 Page - Texas Instruments |
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BQ24401PW Datasheet(HTML) 9 Page - Texas Instruments |
9 / 15 page Temperature Monitoring The bq24401 measures the temperature by the voltage at the TS pin. This voltage is typically generated by a nega- tive-temperature-coefficient thermistor. The bq24401 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 bq24401 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 bq24401 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 bq24401. Sleep Mode The bq24401 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 bq24401 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 bq24401 2000TCS.eps BAT- Power Supply ground bq2000 ground SNS RSNS Rf Cf 1 2 VSS bq2000T Figure 8. Current-Sensing Circuit Absolute Maximum Ratings Symbol Parameter Minimum Maximum Unit Notes VCC VCC relative to VSS -0.3 +7.0 V VT DC voltage applied on any pin, ex- cluding VCC relative to VSS -0.3 +7.0 V TOPR Operating ambient temperature -20 +70 °C TSTG Storage temperature -40 +125 °C TSOLDER Soldering temperature - +260 °C 10s max. Note: Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional operation should be limited to the Recommended DC Operating Conditions detailed in this data sheet. Exposure to conditions beyond the operational limits for extended periods of time may affect device reliability. bq24401 bq24401 |
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