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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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L9374LF 데이터시트(PDF) 41 Page - STMicroelectronics |
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L9374LF 데이터시트(HTML) 41 Page - STMicroelectronics |
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41 / 80 page  DocID025414 Rev 1 41/80 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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