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BQ2947 Datasheet(PDF) 9 Page - Texas Instruments |
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BQ2947 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 27 page OUT V4 V3 V1 V2 VSS VDD CD PACK+ PACK– RIN CCD CVD RVD VOV 8 7 9 1 2 3 4 5 6 PWPD Enable Active Delay Charge/ Discharge Circuit CIN CIN CIN CIN RIN RIN RIN 9 bq2947 www.ti.com SLUSB15F – SEPTEMBER 2012 – REVISED JANUARY 2017 Product Folder Links: bq2947 Submit Documentation Feedback Copyright © 2012–2017, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The bq2947 is a second level overvoltage (OV) protector. Each cell is monitored independently by comparing the actual cell voltage to a protection voltage threshold, VOV. The protection threshold is preprogrammed at the factory with a range between 3.85 V and 4.65 V. 8.2 Functional Block Diagram Figure 7 shows a CMOS Active High configuration. Figure 7. Block Diagram NOTE In the case of an Open Drain Active Low configuration, an external pull-up resistor is required on the OUT terminal. 8.3 Feature Description In the bq2947 family of devices, if any cell voltage exceeds the programmed OV value, a timer circuit is activated. This timer circuit charges the CD pin to a nominal value, then slowly discharges it with a fixed current back down to VSS. When the CD pin falls below a nominal threshold near VSS, the OUT terminal goes from inactive to active state. Additionally, a timeout detection circuit checks to ensure that the CD pin successfully begins charging to above VSS and subsequently drops back down to VSS, and if a timeout error is detected in either direction, it will similarly trigger the OUT pin to become active. See Figure 9 for details on CD and OUT pin behavior during an overvoltage event. |
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