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L9374LF Datasheet(PDF) 41 Page - STMicroelectronics

Part # L9374LF
Description  Four channel valve driver
PDF  80 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9374LF Datasheet(HTML) 41 Page - STMicroelectronics

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L9374LF
Circuit description
79
4.8
Diagnostics
There is a large amount of diagnostic functions in the L9374LF. These functions are
designed to verify internal as well as external conditions to the L9374LF. In so doing virtually
every function is checked for proper operation. All of the diagnostic results are read by the
master μC via SPI commands.
Figure 25. Diagnosis block diagram
4.8.1
Undercurrent / openload
Undercurrent can be detected if the current through the load in on-state is below the
undercurrent threshold (IUC,Table 15) for longer than the filter time (tUC,Table 18). The filter
is active in that a counter counts up when the undercurrent is detected (the device is on
AND load current below IUC) and counts down when undercurrent is not detected (either the
device is off OR the current is above IUC). Once undercurrent is detected the SPI fault bit is
reset when the counter reaches 0.
This bit is not latched unless undercurrent is detected during the SVDT test.



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