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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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L9945 Scheda tecnica(PDF) 115 Page - STMicroelectronics |
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L9945 Scheda tecnica(HTML) 115 Page - STMicroelectronics |
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115 / 144 page  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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