3 Technical Description
G PCIe 6281
15
3.5.1 CAN/ CAN FD
The
G PCIe 6281
Multibus Controller supports a total of eight CAN/ CAN FD interfaces.
For CAN and CAN FD the same transceiver is used:
•
TJA1044GT
The following specifications apply to the transceiver:
Symbol Parameter
Min.
Typ.
Max.
Unit
Comment
C
Transfer rate
5
MBit/s
VBAT
int
Internal battery voltage
12
V
switchable
VBAT
ext
External battery voltage
27
V
R
CAN
Termination resistance
120
Ω
switchable
Table 3.10 Electrical characteristics for CAN/ CAN FD
The CAN 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_Can_Node_In-
ternalVBat_Disable
. In this case, the external voltage (UBAT
ext
) must be fed via the predefined pins on the
front connector. With
G_Can_Node_InternalVBat_Enable
the internal supply is switched on again.
The
120Ω bus terminating resistor
of the transceiver can be deactivated by software with the
G-API
command
G_Can_Node_BusTermination_Disable
. With
G_Can_Node_BusTermination_Enable
the bus
termination resistor is reactivated.
3.5.2 LIN/ K-Line
The
G PCIe 6281
Multibus Controller supports a total of eight LIN/ K-Line interfaces
For LIN the following transceiver is used:
•
TJA1020
The following specifications apply to the transceiver:
Symbol Parameter
Min.
Typ.
Max.
Unit
Comment
Transfer rate
19.2
kBit/s
VBAT
int
Internal battery voltage
12
V
switchable
VBAT
ext
External battery voltage
12
27
V
R
LIN
Pull up resistance
1
30
kΩ
switchable for Master (1k)/
Slave (30k)
Table 3.11 Electrical characteristics for LIN
The LIN interface is generally supplied with an
internal 12V voltage
(UBAT
int
). If other voltage levels are used, the
internal voltage of all LIN interfaces can be controlled by software with the
G-API
command
G_Lin_Node_
InternalVBat_Disable
. In this case, the external voltage (UBAT
ext
) must be fed via the predefined pins on
the front connector. With
G_Lin_Node_InternalVBat_Enable
the internal supply is switched on again.
The
1kΩ pull up resistor
corresponds to the LIN Master Bus termination and can be activated by software with
the
G-API
Kommando
G_Lin_PullUpResistor_Enable
. With
G_Lin_PullUpResistor_Dis-
able
the slave mode is activated. When deactivated (slave mode), the internal terminating resistor of the LIN
transceiver becomes active (30kΩ).