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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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ACT8946AQJ203-T Fiches technique(PDF) 32 Page - Active-Semi, Inc |
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ACT8946AQJ203-T Fiches technique(HTML) 32 Page - Active-Semi, Inc |
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32 / 37 page  ACT8946AQJ203-T Rev 1.0, 08-Jul-16 ActivePMU and ActivePath are trademarks of Active-Semi. - 32 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. the Precondition Timer expires. Set the TIMRTOT[ ] bit to 1 and TIMRSTAT[ ] bit to 1 to generate an interrupt when the Total-Charge Timer expires. TIMRDAT[ ] indicates the status of the charge timers. A value of 1 indicates a precondition time- out or a total charge time-out occurs, a value of 0 indicates other cases. When an interrupt is generated by the charge timers, reading the TIMRSTAT[ ] returns a value of 1. TIMRSTAT[ ] is automatically cleared to 0 upon reading. When no interrupt is generated by the charge timers, reading the TIMRSTAT[ ] returns a value of 0. Table 8: PRECONDITION Safety Timer Setting Table 9: Total Safety Timer Setting Charge Status Indicator The charger provides a charge-status indicator output, nSTAT. nSTAT is an open-drain output which sinks current when the charger is in an active-charging state, and is high-Z otherwise. nSTAT features an internal 8mA current limit, and is capable of directly driving a LED without the need of a current-limiting resistor or other external circuitry. To drive an LED, simply connect the LED between nSTAT pin and an appropriate supply, such as VSYS. For a logic-level charge status indication, simply connect a resistor from nSTAT to an appropriate voltage supply. Table 10: Charging Status Indication Reverse-Current Protection The charger includes internal reverse-current protection circuitry that eliminates the need for blocking diodes, reducing solution size and cost as well as dropout voltage relative to conventional battery chargers. When the voltage at CHGIN falls below VBAT, the charger automatically reconfigures its power switch to minimize current drawn from the battery. Battery Temperature Monitoring In a typical application, the TH pin is connected to the battery pack's thermistor input, as shown in Figure 3. The charger continuously monitors the temperature of the battery pack by injecting a 102μA (typ) current into the thermistor (via the TH pin) and sensing the voltage at TH. The voltage at TH is continuously monitored, and charging is suspended if the voltage at TH exceeds either of the internal VTHH and VTHL thresholds of 0.5V and 2.51V, respectively. Figure 3: Simple Configuration The net resistance (from TH to GA) required to cross the thresholds are given by: 102μA × RNOM × kHOT = 0.5V → RNOM × kHOT ≈ 5kΩ 102μA × RNOM × kCOLD = 2.51V → RNOM × kCOLD ≈ 25kΩ where RNOM is the nominal thermistor resistance at room temperature, and kHOT and kCOLD represent the ratios of the thermistor's resistance at the desired hot and cold thresholds, respectively, to the resistance at 25°C. Battery Temperature Interrupts In order to ease detecting the status of the battery temperature, the charger features the ability to generate interrupts based upon the status of the battery temperature. Set the TEMPOUT[ ] bit to 1 and TEMPSTAT[ ] bit to 1 to generate an interrupt when battery temperature goes out of the valid temperature range. Set the TEMPIN[ ] bit to 1 and TEMPSTAT[ ] bit to 1 to generate an interrupt when battery temperature returns to the valid range. TEMPDAT[ ] indicates the status of the battery temperature. A value of 1 indicates the battery PRETIMO[1] PRETIMO[0] PRECONDITION TIME-OUT PERIOD 0 0 40 mins 0 1 60 mins 1 0 80 mins 1 1 Disabled TOTTIMO[1] TOTTIMO[0] TOTAL TIME-OUT PERIOD 0 0 3 hrs 0 1 4 hrs 1 0 5 hrs 1 1 Disabled STATE nSTAT PRECONDITION Active FAST-CHARGE Active TOP-OFF Active END-OF-CHARGE High-Z SUSPEND High-Z TEMPERATURE FAULT High-Z TIME-OUT-FAULT High-Z + – + – TH VTHH VTHL 102µA Li + Battery Pack + – NTC ACT8946A |
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