Civil Engineering Reference
In-Depth Information
communication may be possible
,
at others, never. So, the
Recovery
behaviour will
be mostly tested: After application of a failure for 10 s followed by removal, the
transceiver still has to work properly and must not be damaged anyhow.
Transceiver with Low-Power mode must be able to switch into this mode under
all failure conditions. So at least, no unwanted current consumption would be pos-
sible.
Ground Shift and Loss of Power/Ground failures will be tested at all nodes, one
after the other.
6.2.5.11
CAN-ISO-Tests for CAN Transceiver
In the network tests described above, the electrical parameters of the transceiv-
ers as bus levels and thresholds will be tested only implicitly on the basis of the
communication behaviour. These parameters should be stated reliably in the data
sheets, but nevertheless some car manufacturers require them to be tested. So it
has to be evaluated if the exact limiting values will be met as they are listed in the
corresponding specifications of ISO 11898 standard. To fulfil the requirements over
the whole temperature range, the tests will be also performed at low and high tem-
perature (−40°C/ + 125°C).
6.2.6 Conclusion
CAN transceiver tests and, in particular, the presentation of the test idea on which
these tests are based were subject of this chapter. These test ideas combine appro-
priate test methods and test principles so that the risk factors that are critical for the
proper functioning of a CAN network can be minimized.
These test ideas were realized in the test systems for CAN transceiver tests; their
functionality and basic structure were also described in this chapter.
The test systems are located at C&S group GmbH, Wolfenbuettel. Since 2001,
newly developed CAN transceivers are tested there. Statistics show that the proce-
dure of CAN transceiver testing is reasonable and of utmost importance, because
not all of the tested transceivers were without faults in the first run.
If the manufacturer permits the publication, the name of the respective tested
CAN transceiver together with the manufacturer's name is included on a list. This
list is available on the website of C&S group GmbH.
The test system is modular. This makes it possible to adapt the proven test idea
to new requirements resulting from revisions and extensions of the CAN specifica-
tions.
The test specifications mentioned in this chapter are public and can be viewed
on the website of C&S group GmbH. Beyond this, the website provides also further
information about the testing activities of the group.
