CHAPTER 3. TECHNICAL DESCRIPTION
GÖPEL electronic GmbH
•
L9637D
The following specifications apply to the transceiver:
Table 3.13: Electrical characteristics for K-Line
Symbol
Parameter
Min.
Typ.
Max.
Unit
Comment
Transfer rate
9,6
kBit/s
UBAT
int
Internal battery voltage
12
V
switchable
UBAT
ext
External battery voltage
12
27
V
3.5.3 FlexRay
The
G CAR 6282
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 interfaces, 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:
Table 3.14: Electrical characteristics for FlexRay
Symbol
Parameter
Min.
Typ.
Max.
Unit
Comment
Transfer rate
2,5
10
MBit/s
per channel
UBAT
int
Internal battery voltage
12
V
switchable
UBAT
ext
External battery voltage
5
12
48
V
R
FR
Termination resistance
100
Ω
switchable
The FlexRay interface is generally supplied with an
internal 12 V 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
predefined pins on the front connector. With
G_FlexRay_Node_InternalVBat_Enable
the internal supply is
switched on again.
The battery voltage UBAT of the transceiver slots 13-16 cannot be switched externally.
The
100
Ω
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_Enable
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.
G CAR 6282
19
