BMW F48 Technical Training Manual page 10

F48￿General￿Vehicle￿Electronics
1.￿Vehicle￿Electrical￿System
CAN￿terminator
CAN￿terminator
Depending￿on￿the￿equipment￿package,￿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￿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.
Ferrite￿core
A￿ferrite￿core￿is￿a￿component￿made￿from￿the￿ferromagnetic￿material￿iron￿oxide￿hematite￿(Fe203).￿It￿is
characterized￿by￿low￿or￿no￿conductivity.￿The￿inductance￿or￿the￿magnetic￿field￿is￿increased￿as￿part￿of￿a
coil￿(throttle￿or￿transformer).￿If￿a￿ferrite￿core￿is￿secured￿around￿a￿conductor,￿which￿routes￿signals￿at￿low
frequency￿or￿direct￿current￿voltage,￿high-frequency￿faults￿are￿attenuated￿with￿its￿help.
Ferrite￿core
Index
1
6
Explanation
Ferrite￿core￿using￿the￿example￿of￿a￿USB￿line