Pt-Can; Can Terminator - BMW i3 Technical Training Manual

I01￿General￿Vehicle￿Electronics
1.￿Vehicle￿Electrical￿System
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The￿CAN-Buses￿are￿shown￿in￿the￿overview￿of￿the￿bus￿systems.￿The￿actual￿physical￿layout￿(topology)￿is
shown￿using￿the￿example￿of￿the￿K-CAN3.
As￿with￿most￿bus￿systems￿terminating￿resistors￿are￿also￿used￿for￿termination￿for￿the￿K-CAN￿to￿avoid
reflections￿on￿the￿data￿lines.
The￿terminating￿resistors￿for￿the￿termination￿are￿located￿in￿the
• Body￿Domain￿Controller
• and￿CAN￿terminator.
All￿other￿control￿units￿are￿connected￿at￿the￿CAN￿terminator￿without￿a￿terminating￿resistor.
CAN￿terminator
In￿the￿CAN￿terminator￿the￿terminating￿resistor￿for￿the￿corresponding￿CAN-Bus￿is￿installed.￿The
terminating￿resistor￿comprises￿two￿resistances￿connected￿in￿series,￿each￿60￿Ohm.￿A￿measuring
tap￿against￿ground￿with￿a￿resistor￿and￿capacitor￿for￿the￿reduction￿of￿high-frequency￿faults￿is￿also
installed.￿Ferrite￿beads￿are￿installed￿for￿all￿bus￿lines￿in￿the￿CAN￿terminator.￿Ferrite￿beads￿suppress
high-frequency￿faults￿on￿the￿CAN￿data￿lines,￿thus￿making￿possible￿line￿lengths￿of￿up￿to￿5 m￿in￿the
wiring￿harness.
1.2.2.￿PT-CAN
In￿the￿I01￿the￿following￿PT-CAN￿are￿used:
•

PT-CAN

• PT-CAN2.
The￿gateway￿for￿the￿PT-CAN2￿is￿located￿in￿the￿Electrical￿Digital￿Motor￿Electronics￿(EDME).
Both￿PT-CAN￿data￿buses￿have￿a￿data￿transfer￿rate￿of￿500 kBit/s.
Explanation
Frontal￿Light￿Electronics￿Left￿(FLEL)
Frontal￿Light￿Electronics￿Right￿(FLER)
Body￿Domain￿Controller￿(BDC)
CAN￿terminator
Top￿Rear￿Side￿View￿Camera￿(TRSVC)
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