ETAS ES910.3-A - Bus Terminating Resistor; Feature; LIN Interface (CAN1;LIN1, CAN2;LIN2)

ES910.3-A - User’s Guide 31
ETAS Functional Description
4.8.2 Feature
You can find a list of CAN applications supported by the ES910.3-A in chapter
7.6.2 on page 78.
4.8.3 Bus Terminating Resistor
Low-Speed CAN
In the ES910.3-A, two relatively high-impedance termination resistors of
2.26 kOhm each (RTH, RTL) are integrated for the Low-Speed CAN link.
This guarantees that, in a terminated CAN network, the ES910.3-A does not
have a great influence on the sum of the terminations of the overall system. This
should, however, be checked regardless particularly with lab networks or with
tests in existing networks.
In a Low-Speed CAN network, the individual nodes are typically terminated with
500 Ohm to 6 kOhm. To ensure optimum system conditions, the CAN network
should be terminated with around 100 Ohm (parallel connection of all termina-
tions).
For more details on the Low-Speed CAN network, consult the ISO/DIS 11898
“Road vehicles — Controller area network (CAN) — Part 3: Low-Speed, fault-
tolerant, medium dependent interface”.
High-Speed CAN
The High-Speed operating mode of the CAN interface requires the use of bus
termination resistors.
In accordance with the CAN specification, a bus termination resistor of 120 Ohm
is required at each of the two open ends of the bus. This has to be connected to
the cable or to the connector. ETAS supplies cables and termination resistors of
120 Ohm for setting up CAN networks.
4.9 LIN Interface (CAN1/LIN1, CAN2/LIN2)
The ES910.3-A has two LIN interfaces. One each of the LIN interfaces is routed to
the two 8-pin CAN1/LIN1 and CAN2/LIN2 connectors (Lemo socket) on the front
panel.
LIN1 and LIN2 are completely independent LIN interfaces with separate connec-
tions and LIN controllers. The LIN interfaces establish a simple and direct connec-
tion between the ES910.3-A and the LIN network. The interfaces are galvanically
isolated from each other and from the other interfaces of the ES910.3-A and are
also protected against overload and incorrect stress.
Note
The bus termination resistors intended for High-Speed CAN can not be used in
this operating mode!
Note
The four interfaces CAN1 and LIN1 (CAN1/LIN1 connector) or CAN2 and LIN2
(CAN2/LIN2 connector) can be configured and used simultaneously and inde-
pendently of one another.