User's Manual l MBa8Xx UM 0100 l © 2020, TQ-Systems GmbH
Page 22
3.8.2
CAN
Both CAN interfaces of the MBa8Xx are directly connected to the CAN ports of the TQMa8Xx and are available at the two 3-pin
connectors X11 and X12. Both interfaces are galvanically isolated with 1 kV. The CAN interfaces are not electrically isolated from
each other. The CAN signals can be terminated with 120 Ω via DIP switches SW1 and SW2.
Galvanically separated
TQMa8Xx
CAN0
CAN1
3-pin Header
(X12)
3-pin Header
(X11)
Transceiver
TJA1052i
Transceiver
TJA1052i
Figure 10: Block diagram CAN
Table 23:
CAN termination
DIP switch
Interface
ON
OFF
SW1-1 & SW1-2
CAN0
CAN0 terminated with 120 Ω
CAN0 not terminated
SW2-1 & SW2-2
CAN1
CAN1 terminated with 120 Ω
CAN1 not terminated
Table 24:
Pinout CAN0 / 1 (X11, X12)
CAN
Pin
Signal
Dir.
Level
Remark
CAN0
1
CAN0_H
I/O
Spec.
(13)
CAN High-Level I/O from CAN0 / galvanically isolated
2
CAN0_L
I/O
CAN Low-Level I/O from CAN0 / galvanically isolated
3
GND_CAN
P
0 V
Ground / galvanically isolated
CAN1
1
CAN1_H
I/O
CAN High-Level I/O from CAN1 / galvanically isolated
2
CAN1_L
I/O
CAN Low-Level I/O from CAN1 / galvanically isolated
3
GND_CAN
P
0 V
Ground / galvanically isolated
13:
According to CAN standard.
