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L9788 数据表(PDF) 87 Page - STMicroelectronics |
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L9788 数据表(HTML) 87 Page - STMicroelectronics |
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87 / 264 page  DS12308 Rev 4 87/264 L9788 Low-side drivers 263 Figure 33. Low-side driver OFF state diagnosis timings If DiagOL or DiagLV signals remain high for a time higher than Diag Filter Time the fault bit is set and can be read by Read Diag Communication. This bit is reset by every Read Diag Communication. 7.1.5 Error handling GADG0112161213PS V_OL VLVT COMMAND COMMAND VOUT < Tflt_diagoff Tflt_diagoff LOW SIDE OUTPUT VOLTAGE OPEN LOAD t DIAG OFF FAULT OPEN LOAD OFF NO FAULT NO FAULT V_OL VLVT COMMAND VOUT Tflt_diagoff LOW SIDE OUTPUT VOLTAGE t DIAG OFF FAULT OFF NO FAULT V_OL VLVT VOUT < Tflt_diagoff NORMAL LOAD LOW SIDE OUTPUT VOLTAGE t DIAG OFF NO FAULT NO FAUT V_OL VLVT COMMAND VOUT < Tflt_diagoff Tflt_diagoff LOW SIDE OUTPUT VOLTAGE t DIAG OFF FAULT FAULT FASTCHARGE OFF FAULT SHORT-TO-GROUND LOAD SHORT-TO-GROUND LOAD SHORT-TO-GROUND LOAD SHORT-TO-GROUND LOAD Table 43. Low-side driver error handling Type of error Detection condition Action Clear MSC flag Restart condition Driver Diagnostic Overcurrent (OVC) Driver on Driver is put in off state. The fault is latched in MSC diagnosis register. On read At MSC read of diagnosis register if MSC command is still high. If MSC command is low and high again. Short to ground (STG) Driver off The fault is latched in MSC diagnosis register. On read - Open load (OPL) Driver off The fault is latched in MSC diagnosis register. On read - |
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