L9963E datasheet(140/184 Pages) STMICROELECTRONICS

Il numero della parte	L9963E

Spiegazioni elettronici	Automotive Multicell battery monitoring and balancing IC

PDF	184 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

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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

L9963E Scheda tecnica(PDF) 140 Page - STMicroelectronics