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BQ77904 Datasheet(PDF) 15 Page - Texas Instruments |
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BQ77904 Datasheet(HTML) 15 Page - Texas Instruments |
15 / 46 page protection-fault checks. Comparator 1 checks for OV, UV, and OW protection faults. Comparator 2 checks for OCD1, OCD2, SCD, OTC, OTD, UTC, and UTD protection faults. For OV, UV, and OW protection faults, every cell is checked individually in round-robin fashion, starting with cell 1 and ending with the highest-selected cell. The number of the highest cell is configured using the CCFG pin. Devices can be ordered with various timing and hysteresis settings. See the Section 5 section for a summary of options available per device type. Check OV VCELL1 Check OV VCELL2 Time to check UV? Check OV VCELLn Check UV VCELL1 Check UV VCELL2 Check UV VCELLn Time to check OW? Turn off Comp1 until next cycle start Check OW VCELLx, x = x +1 YES Reset x = 1, if x > the highest cell configured via CCFG pin YES NO NO n = the highest call configured by CCFG pin x starts from 1 at POR Figure 8-1. Comparator 1 Flowchart Check SCD Time to check OCD1? Time to check OCD2? Check OCD1 Check OCD2 YES YES NO NO Time to check OT? Time to check UT? Check OT Check UT YES YES NO NO Figure 8-2. Comparator 2 Flowchart 8.3.2 Fault Operation 8.3.2.1 Operation in OV An OV fault detection is when at least one of the cell voltages is measured above the OV threshold, VOV. The CHG pin is turned off if the fault condition lasts for a duration of OV Delay, tOVn_DELAY. The OV fault recovers when the voltage of the cell in fault is below the (OV threshold – OV hysteresis, VHYS_OV) for a time of OV Delay. The BQ77904 and BQ77905 assume OV fault after device reset. www.ti.com BQ77904, BQ77905 SLUSCM3K – APRIL 2020 – REVISED JULY 2020 Copyright © 2020 Texas Instruments Incorporated Submit Document Feedback 15 Product Folder Links: BQ77904 BQ77905 |
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