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L9963E Datasheet(PDF) 92 Page - STMicroelectronics |
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L9963E Datasheet(HTML) 92 Page - STMicroelectronics |
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92 / 184 page  Table 60. Failure validation table Failure type What to check for validation Reason Cell UV/OV Sum of cells Is the sum of cells coherent with a cell UV/OV failure? Balance UV If a cell UV is detected, then also balance UV should be flagged Cx Open Not measuring actual cell voltage Balance open PCB connector to a cell might have been lost HWSC Is measurement reliable? Sum of cells UV/OV VBAT direct conversion Is the VBAT direct conversion close to the sum of cells? Cell UV/OV Is there at least one cell in UV/OV condition? Cx Open Not measuring actual cell voltage HWSC Is measurement reliable? Balance UV Cell UV If a Cell UV is flagged, then it’s much worse than simple balance UV Cx Open Not measuring actual cell voltage Balance open PCB connector to cell might have been lost HWSC Is measurement reliable? VBAT UV/OV Cell UV/OV If no cell is UV/OV, then it’s not plausible Sum of Cells Does the sum of cells confirm the UV/OV event? VBAT direct conversion and monitor Is the conversion value actually reporting an OV/UV? Or is it just a transient OV/UV (as per VDA)? Cx Open Summing wrong Cx contributions HWSC Is measurement reliable? GPIO UT/OT GPIO open Not measuring actual load voltage HWSC Is measurement reliable? VTREF Is the VTREF regulator working properly? Fast Charge OT GPIO open Not measuring actual load voltage HWSC Is measurement reliable? VTREF Is the VTREF regulator working properly? Cell open HWSC Is measurement reliable? GPIO open GPIO UT/OT If connection to the external NTC is lost at the PCB connector, the GPIO will be pulled up to VTREF, thus causing GPIO UT detection. On the other hand, if the connection is lost at the device pin, the GPIO open internal diagnostic circuitry will detect it. HWSC Is measurement reliable? VTREF Is the VTREF regulator working properly? Balance open HWSC Comparators must have correctly flagged open PCB Connector open Balance open In case PCB connector to CELLx is open, then BALx and BALx+1 open failures will be flagged HWSC VREG UV/OV BIST may have failed because supply is not in range. Checking VBAT and UV/OV comparators functionality is recommended. VBAT UV/OV L9963E Voltage conversion routine DS13636 - Rev 12 page 92/184 |
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