BMW F48 - CAN Terminator Function

F48�General�Vehicle�Electronics
1.�Vehicle�Electrical�System
6
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 Explanation
1 Ferrite�core�using�the�example�of�a�USB�line