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BQ294572 Datasheet(PDF) 10 Page - Texas Instruments |
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BQ294572 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 26 page VOV V OV –VHYS OUT (V) t DELAY 10 bq294502, bq294504, bq294512, bq294514 bq294515, bq294522, bq294524, bq294532 bq294533, bq294562, bq294572, bq294582, bq294592 SLUSAJ3F – SEPTEMBER 2011 – REVISED JUNE 2017 www.ti.com Product Folder Links: bq294502 bq294504 bq294512 bq294514 bq294515 bq294522 bq294524 bq294532 bq294533 bq294562 bq294572 bq294582 bq294592 Submit Documentation Feedback Copyright © 2011–2017, Texas Instruments Incorporated Feature Description (continued) Figure 6. Timing for Overvoltage Sensing 8.3.1 Sense Positive Input for VX This is an input to sense each single battery cell voltage. A series resistor and a capacitor across the cell for each input is required for noise filtering and stable voltage monitoring. 8.3.2 Output Drive, OUT The gate of an external N-channel MOSFET is connected to this terminal. This output transitions to a high level when an overvoltage condition is detected and after the programmed delay timer. OUT will reset to a low level if the cell voltage falls below the VOV threshold before the fixed delay timer expires. 8.3.3 Supply Input, VDD This terminal is the unregulated input power source for the IC. A series resistor is connected to limit the current, and a capacitor is connected to ground for noise filtering. 8.3.4 Thermal Pad, PWRPAD For correct operation, the power pad (PWRPAD) is connected to the VSS terminal on the PCB. 8.4 Device Functional Modes 8.4.1 NORMAL Mode When all of the cell voltages are below the overvoltage threshold, VOV, the device operates in NORMAL mode. The device monitors the differential cell voltages connected across (V1–VSS), (V2–V1) and (V3–V2). The OUT pin is inactive in this mode. 8.4.2 OVERVOLTAGE Mode OVERVOLTAGE mode is detected if any of the cell voltages exceeds the overvoltage threshold, VOV for the configured OV delay time, tDELAY. The OUT pin will pull high internally. An external FET ihen turns on, shorting the fuse to ground, which allows the battery or charger power to blow the fuse. When all of the cell voltages fall below (VOV–VHYS), the device returns to NORMAL mode. |
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