L9300 datasheet(158/178 Pages) STMICROELECTRONICS

номер детали	L9300

подробное описание детали	Automotive flexible U-chip for braking and transmission

PDF	178 Pages

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производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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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

LOAD

RETURN

LVT

PWM_fault_2

No fault

tmask

PWM_fault_1

PWM

VOL

LOAD

RETURN

LVT

PWM_fault_2

Fault condition

tmask

L9300

Functional safety

DS12258 - Rev 5

page 158/178

L9300 датащи(PDF) 158 Page - STMicroelectronics