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L9300 Datasheet(PDF) 158 Page - STMicroelectronics |
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L9300 Datasheet(HTML) 158 Page - STMicroelectronics |
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158 / 178 page  PWM check Off-state diagnostic comparators can be used during on state functionality to compare the status of output stage with respect to the PWM input coming from control logic. These comparators start working after an auto- adaptative masking time, dependent on the slew rate settings to take into account the time needed for slew rate control to settle the output voltage. If the output status then differs from PWM input a fault bit is latched in the SPI Exception registers (for information only). For redundancy, the fault bit is available for both diagnostic comparators (open load and lvt) and can be cleared on read. Self test behavior for LS configuration is shown as an example in the figure below. In case self test is activated with PWM functionality already running an initial spurious fail can be triggered and must be cleared to validate the self test result. Figure 70. PWM test implementation assuming LS configuration GADG2707170818PS tmask PWM_fault_1 PWM VOL VS LOAD RETURN LVT PWM_fault_2 No fault tmask tmask PWM_fault_1 PWM VOL VS LOAD RETURN LVT PWM_fault_2 Fault condition tmask + - + - + - + - L9300 Functional safety DS12258 - Rev 5 page 158/178 |
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