Question:
What has to be observed when wiring the internal power source for controller enable on the system bus CAN FIF module?
Answer:
Hardware status < 2A
When using the internal power source for controller enable in hardware statuses < 2A (e.g. 1x) of the system bus CAN FIF module, a jumper has to be placed between terminals 20 - 28.
Hardware status >= 2A
As of hardware status 2A a jumper also has to be placed between GND 1 and 2 (terminals 7 - 39) because the two GNDs are not connected to one another internally.
Remark:
Separation of potentials GND1 and GND2 was performed in order to allow zero-potential supply to the system bus with external supply voltage. That avoids any circulating currents in the GND wiring.
