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L9300 데이터시트(PDF) 158 Page - STMicroelectronics

부품명 L9300
상세설명  Automotive flexible U-chip for braking and transmission
PDF  178 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9300 데이터시트(HTML) 158 Page - STMicroelectronics

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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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