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TCAN1164-Q1: Context of specifying ISO 7637 ISO pulse transients Vtrans

Part Number: TCAN1164-Q1

Tool/software:

Hi,

In general, Pulse 1 etc are performed on supply lines. In TCAN1164-Q1 datasheet, it is specified as rating that Pulse 1, Pulse 2 , Pulse 3a, Pulse 3b between CAN communication lines to GND, VSUP.

Can you please explain what it means? 

Whether pulse is applied with respect to GND & CAN lines (and) also VSUP & CAN lines? If so, what is the purpose of doing that?

Thanks,

Sri Viswa