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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L9945 датащи(PDF) 117 Page - STMicroelectronics |
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L9945 датащи(HTML) 117 Page - STMicroelectronics |
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117 / 144 page  GCC_override_config IPU or IPD [mA] 1 1 → 20 5 → 20 Note: IPU is used to shut down PMOS, while IPD shuts down NMOS. The GCC override configuration is applied as soon as an OC event is detected. The original GCC configuration is restored once diagnostics have been read. 6.3.2 Output re-engagement strategy after an OC event After an OC event, the affected output must be manually re-engaged. There are two reactivation strategies, configurable via SPI bit prot_config_xx: • Output re-engagement with control signal switching event (default); • Output re-engagement after diagnostic readout and control signal switching event. In case of H-Bridge configuration, the prot_config_xx has no effect. Re-engagement is always performed after diagnostic readout. Note: Control signal can be either NONx or SPI_ON_OUTxx, depending on SPI_INPUT_SEL_xx bit 6.3.3 OC sensing strategy OC detection is performed by sensing the voltage either on an external shunt resistor or between the drain and the source of the external FET. Detection strategy can be selected on each channel independently by programming the OC_DS_Shunt_xx bit as follows: Table 38. OC sensing strategy OC_DS_Shunt_xx OC sensing strategy 0 Drain To Source Measurement (DSM) 1 Shunt Measurement Figure 30. Overcurrent sensing method (example on a LS NMOS) BATT34 OC_DS_SHUNT = 0 → VDS OC_DS_SHUNT = 1 → VSH LS NMOS DRN3 VBATT GNSP3 SNGP3 RG RPD CM RM RSH GND DFW CESD PGND34 GADG0806171536PS The following behaviors correspond to the different sensing methods (refer to Figure 31): L9945 Safety & diagnostics DS12275 - Rev 10 page 117/144 |
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