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L9908 データシート(PDF) 19 Page - STMicroelectronics |
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L9908 データシート(HTML) 19 Page - STMicroelectronics |
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19 / 152 page  4.2 Safe state activation Depending on the safe state its activation is performed through one between two separate paths. Figure 6. Safe states activation paths Logic activation path: safe state activation is carried out entirely by the main logic. This path is used to develop: • SAFE HIZ (except if determined by CLK1_TIME_OUT) • SAFE DIS • SAFE OFF Damage protected activation path: in case of device failure where internal main logic integrity is compromised L9908 implements an isolated Safe Switch Off structure which allows to activate an isolated Safe Switch Off structure which can be activated through a separated path. This path is used to develop: • SAFE OFF (only if determined by NDIS = 0) • CLK1_TIME_OUT The Safe State activation through the damage protected path is signaled by setting the dedicated SPI read only bit SAFE_STATE (GEN_STATUS1[2]). L9908 Functional safety DS13546 - Rev 5 page 19/152 |
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