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BQ294602 Datasheet(PDF) 3 Page - Texas Instruments |
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BQ294602 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 17 page VOV V OV V HYS OUT (V) t DELAY – bq294602, bq294604 www.ti.com SLUSAS0B – DECEMBER 2011 – REVISED MARCH 2012 PIN FUNCTIONS bq2946xy Pin Name Type I/O Description 1 NC — No Connection 2 V1 IA Sense input for positive voltage of the cell Electrically connected to IC ground and negative terminal of the 3 VSS P cell Electrically connected to IC ground and negative terminal of the 4 VSS P cell 5 VDD P Power supply 6 OUT OA Output drive for external N-Channel FET VSS pin to be connected to the PWRPAD on the printed circuit Thermal Pad PWRPAD — board for proper operation PIN DETAILS Description The method of overvoltage detection is comparing the cell voltage to an overvoltage protection threshold voltage VOV. Once the cell voltage exceeds the programmed fixed value VOV, the delay timer circuit is activated. This delay (tDELAY) is fixed for 4 s for the bq294602 device. When these conditions are satisfied, the OUT terminal is transitioned to a high level. This output (OUT) is released to a low condition if the cell input (V1) is below the OVP threshold minus the VHYS. Figure 1. Timing for Overvoltage Sensing Sense Positive Input for V1 This is an input to sense single battery cell voltage. A series resistor and a capacitor across the cell is required for noise filtering and stable voltage monitoring. 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. The out will reset to a low level if the cell voltage falls below the VOV threshold before the fixed delay timer expires. 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. Thermal Pad, PWRPAD For correct operation, the power pad (PWRPAD) is connected to the VSS terminal on the printed circuit board. Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Link(s): bq294602 bq294604 |
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