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BQ771800DPJT Datasheet(PDF) 3 Page - Texas Instruments |
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BQ771800DPJT Datasheet(HTML) 3 Page - Texas Instruments |
3 / 19 page VOV V OV –VHYS OUT (V) t DELAY bq771800, bq771801, bq771802 bq771803, bq771808, bq771809 www.ti.com SLUSAX1B – DECEMBER 2012 – REVISED OCTOBER 2013 PIN FUNCTIONS bq7718xy Pin Name Type I/O Description 1 VDD P Power supply 2 V5 I Sense input for positive voltage of the fifth cell from the bottom of the stack 3 V4 I Sense input for positive voltage of the fourth cell from the bottom of the stack 4 V3 I Sense input for positive voltage of the third cell from the bottom of the stack 5 V2 I Sense input for positive voltage of the second cell from the bottom of the stack 6 V1 I Sense input for positive voltage of the lowest cell in the stack 7 VSS P Electrically connected to IC ground and negative terminal of the lowest cell in the stack 8 OUT O Output drive for overvoltage fault signal PIN DETAILS In the bq7718xy device, each cell is monitored independently. Overvoltage is detected by comparing the actual cell voltage to a protection voltage reference, VOV. If any cell voltage exceeds the programmed OV value, a timer circuit is activated. When the timer expires, the OUT terminal goes from inactive to active state. For NCH Open Drain Active Low configurations, the OUT pin pulls down to VSS when active (OV present) and is high impedance when inactive (no OV). Figure 2. Timing for Overvoltage Sensing 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. Output Drive, OUT This terminal serves as the fault signal output, and may be ordered in either active HIGH or LOW options. 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. Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: bq771800 bq771801 bq771802 bq771803 bq771808 bq771809 |
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