3 Technical Description
G PCIe 6281
16
For K-Line the following transceiver is used:
•
L9637D
The following specifications apply to the transceiver:
Symbol Parameter
Min.
Typ.
Max.
Unit
Comment
Transfer rate
9.6
kBit/s
VBAT
int
Internal battery voltage
12
V
switchable
VBAT
ext
External battery voltage
12
27
V
Table 3.12 Electrical characteristics for K-Line
3.5.3 FlexRay
The
G PCIe 6281
Multibus Controller supports a total of two FlexRay interfaces. Since a FlexRay transceiver can
map either the A or B channel, two slots are required per interface. For the total of two possible FlexRay inter-
faces, a total of 4 slots are occupied. The FlexRay controller is fixed in the FPGA.
For FlexRay the following transceiver is used:
•
TJA1081BTS
The following specifications apply to the transceiver:
Symbol Parameter
Min.
Typ.
Max.
Unit
Comment
Transfer rate
2.5
10
MBit/s
per channel
VBAT
int
Internal battery voltage
12
V
switchable
VBAT
ext
External battery voltage
5
12
48
V
R
FR
Termination resistance
100
Ω
switchable
Table 3.13 Electrical characteristics for FlexRay
The FlexRay interface is generally supplied with an
internal 12V voltage
(UBAT
int
). If other voltage levels are
used, the internal voltage can be switched off individually by software with the
G-API
command
G_FleyRay_
Node_InternalVBat_Disable
. In this case, the external voltage (UBAT
ext
) must be fed via the prede-
fined pins on the front connector. With
G_FlexRay_Node_InternalVBat_Enable
the internal supply is
switched on again.
The
100Ω bus terminating resistor
of the transceiver can be deactivated by software with the
G-API
command
G_FlexRay_Node_BusTermination_Disable
. With
G_FlexRay_Node_BusTermination_En-
able
the bus termination resistor is reactivated.
When configured with two FlexRay interfaces both modules can be used together to start a FlexRay cluster. In
this case one node forms the leading cold starter and the other the following cold starter. If the controller under
test itself is a cold start node, an interface alone can start the cluster. In this case, the second interface can be
used to independently operate a second FlexRay cluster.
3.5.4 Automotive Ethernet
The
G PCIe 6281
Multibus Controller supports a total of two Automotive Ethernet interfaces. The coupling to a
test device is capacitive. The two possible Automotive Ethernet transceivers can only be plugged into the slots
TRX7 and TRX8.
We recommend to connect all hardware of your application to one ground. If there are high poten-
tial differences, a stable Ethernet connection cannot otherwise be established.
