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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L9779WD датащи(PDF) 71 Page - STMicroelectronics |
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L9779WD датащи(HTML) 71 Page - STMicroelectronics |
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71 / 170 page  DocID027452 Rev 5 71/170 L9779WD Functional description 169 Figure 44. Ignition-pre drivers (IGN1 to 4) diagram 6.11.2 Ignition pre-driver diagnosis Each channel locally detects and writes its own fault or no-fault condition (codified on 2 bit according to Table 28: Fault encoding condition). The detected faults are: IGNx short circuit to battery (SCB) IGNx open load (OL) IGNx short to GND (SCG) Short to GND This diagnosis is made in two different ways based on the status of IGN_DIA_SGEN. If IGN_DIA_SGEN = 1 When the IGNx is on, if for a time longer than Tign_filt, the current is bigger than IOVC, the short to GND fault is detected and the IGNx output becomes high impedance, the fault is latched and is reset at every Read Diag operation. If IGN_DIA_SGEN = 0 When the IGNx is on, if for a time longer than Tign_filt, the voltage of IGNx is lower than VLVT, the short to GND fault is detected and the IGNx output becomes high impedance, the fault is latched and is reset at every Read Diag operation. The high impedance is removed and IGNx is driven by the command: – after a Read Diag operation – if command is switched OFF and ON again. Open load When IGNt is on, if for a time longer than Tign_filt, the current is below Iol the open-load fault is detected, latched and it is reset at every Read Diag operation. IGNx remains always driven. |
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