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L9945 датащи(PDF) 115 Page - STMicroelectronics

номер детали L9945
подробное описание детали  Automotive fully configurable 8-channel High/Low side MOSFET pre-driver suitable for 12 V and 24 V systems
PDF  144 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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L9945 датащи(HTML) 115 Page - STMicroelectronics

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Table 36. Diagnostic codes
Channel Status
diag_xx[2-0]
Priority
OC pin failure (see note below)
000
1
OC failure
001
2
STG/STB failure
010
3
OL failure
011
4
No failure
100
5
No OC failure
101
6
No OL/STG/STB failure
110
7
No diagnostic done
111
8
Note:
The OC pin failure, corresponding to the code "000" is available only for channels operating in Peak & Hold. This
code is unused in other configurations. Refer to Section 5.6.2 in order to understand how this diagnostic is
performed.
Figure 28. Diagnostic codes quick look
GADG0806171512PS
For an immediate fault detection, the MSB of the diagnostic code can be evaluated, as shown in Figure 28. An
MSB equal to zero indicates that a failure occurred.
By default, all channels will report the "No diagnostic done" message. Such message is also reported in case
diagnostic has been disabled. The diagnostic status follows a priority concept: if more than one event occurs on a
channel, only the one with the highest priority will be encoded in the diag_xx[2-0] bit. Priority codes are related to
the severity of the fault. OC failures have the highest priority.
The diagnostic latches are reset in case of SPI readout, POR or NRES. After a reset event, diagnostic filters are
reset to prevent false detection.
Figure 29 shows an equivalent Finite State Machine (FSM) that helps understanding diagnostic priority.
L9945
Safety & diagnostics
DS12275 - Rev 10
page 115/144



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