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L9908 数据表(PDF) 38 Page - STMicroelectronics |
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L9908 数据表(HTML) 38 Page - STMicroelectronics |
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38 / 152 page  Figure 18. Auto-retry faults - Permanent fault timing diagram 5.6.2.3 Reduced operation faults When a reduced operation fault is detected the related SPI flag is set to ‘1’, the IC ERR bits in SPI FRAME are set to ‘11’ and the FS_FLAG is asserted low. Disable logic reacts forcing the failing half bridge only in a disable mode so that VGHS_n-VSHS_n = 0 V and VGLS_n-VSLSn = 0 V [n → failing HB] (SPI configuration bit HBn_DIS remains set as previously configured). Safe condition is left when all the following conditions are met in the following sequence: 1. Reduced Operation fault is removed; 2. Reduced Operation fault flag is cleared on read (action required by Application SW); 3. SPI bit HBn_ACK [n = 1,2,3] is set ‘0’ and then set back to ‘1’ (action required by Application SW). Note: Since HBn_ACK is a Safety Latent Register (SLR) it is required to access correctly the CONFIG MODE in order to conclude correctly the recovery flow. L9908 Functional description DS13546 - Rev 5 page 38/152 |
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