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L9963E 数据表(PDF) 140 Page - STMicroelectronics |
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L9963E 数据表(HTML) 140 Page - STMicroelectronics |
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140 / 184 page  6.7.1 Distributed BMS In a distributed BMS there are several independent cell monitoring units, each mounted on its own PCB. To ease harness routing and allow for signal regeneration through L9963E acting as a buffer, daisy chained approaches are preferred rather than bus configurations. Hence, in a fashion similar to ISO Lines Circuit, FAULT Line is also daisy chained, as shown in Figure 39. For safety purposes, it is better to feed the daisy chained fault line through the VBAT line, rather than using VCOM regulator. On one hand, using VCOM would result in a much simpler circuit, because FAULTH signal would be in the 5 V digital domain. On the other hand, this would imply routing a 5 V global wire in the harness, thus exposing it to all related transients. In the end, a failure affecting the VCOM global wire would cut off both Isolated Serial Peripheral Interface and FAULT Line. Feeding the fault line with VBAT makes it totally independent from Isolated Serial Peripheral Interface, thus achieving better redundancy and a higher level of safety. L9963E FAULT line circuit DS13636 - Rev 12 page 140/184 |
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