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数据搜索系统，热门电子元器件搜索 |
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L9908 数据表(PDF) 91 Page - STMicroelectronics |
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L9908 数据表(HTML) 91 Page - STMicroelectronics |
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91 / 152 page  OFDn_EN1 OFDn_EN0 Description 0 1 Pull-up current enabled, pull-down current disabled 1 0 Pull-down current enabled, pull-up current disabled 1 1 Off-State diagnosis disabled The OFD is automatically enabled when the OFD_EN bit is set and INLn/INHn = 0 [n = 1,2,3]. Once enabled, the OFD circuit is stopped as soon as a 0 → 1 transition of INHn/INLn is detected. Depending on the external load condition, the OFD configuration and detection shall follow the next table: Table 85. OFD fault detection table Condition OFD_EN[1:0] Error flag Description 3-Phase OFD [Three phase load] OFD1 = 10 OFD2 = 01 OFD3 = 10 HS2_OFD = X(1) LS1_OFD = 0 LS2_OFD = 0 LS3_OFD = 0 Short to ground on one or multiple motor phases HS2_OFD = 0 LS1_OFD = 1 LS2_OFD = 1 LS3_OFD = 1 Short to battery on one or multiple motor phases HS2_OFD = X(1) LS1_OFD = 0 LS2_OFD = 1 LS3_OFD = 1 Open connection on motor phase 1 (SHS_1) HS2_OFD = X(1) LS1_OFD = 0 LS2_OFD = 1 LS3_OFD = 0 Open connection on motor phase 2 (SHS_2) HS2_OFD = X(1) LS1_OFD = 1 LS2_OFD = 1 LS3_OFD = 0 Open connection on motor phase 3 (SHS_3) HS2_OFD = 1 LS1_OFD = 1 LS2_OFD = 1 LS3_OFD = 1 No fault 1. X = do not care. Note: • The OFD circuit can detect a SCB or SCG condition affecting the three phases in general, due to the low DC resistance of the motor it cannot identify at which phase the failure is present. • Correct functionality of OFD is based on a current mismatch between pull-up and pull-down current. In case of additional external pull-up/down contribution the following inequation must be satisfied: IPU_TOTx>IPD_TOT_PHy+IPD_TOT_PHz (21) Where: Ipu_totx is the equivalent pull-up current injected into the phase x (assuming phase x being configured as OFD_EN = 01) Ipd_toty and Ipd_totz are the equivalent pull-down currents injected respectively into the phase y and z (assuming phase y and z being configured as OFD_EN = 10) L9908 Functional description DS13546 - Rev 5 page 91/152 |
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