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User's Manual l MBa335x UM 0202 l © 2018, TQ-Systems GmbH
Page 25
4.2.4
CAN
TQMa335x
3-pin header
(X13)
CAN
transceiver
CAN
transceiver
3-pin header
(X14)
DCAN1
DCAN0
Galvanic separation
Illustration 19:
Block diagram CAN
Both MBa335x CAN interfaces are directly connected to the TQMa335x CAN ports and are made available at the 3-pin connectors
X13 and X14. Both interfaces are galvanically separated.
The CAN interfaces are galvanically not separated among themselves.
Die insulation voltage is 500 V
RMS
. A galvanically separated 5 V power supply is also provided.
The CAN signals can be terminated with 120 Ω using DIP switches S3-1 and S3-2.
The CAN interfaces are not qualified.
Table 36:
CAN DIP switch settings, S3
Switch
Interface
ON
OFF
S3-1
CAN0
CAN1 terminated with 120 Ω
CAN1 not terminated
S3-2
CAN1
CAN2 terminated with 120 Ω
CAN2 not terminated
The following characteristics apply to the interfaces.
Table 37:
Characteristics CAN
Parameter
Min.
Typ.
Max.
Unit
Remark
Transfer rate
–
–
1.0
Mbaud
–
Electric strength
–
–
1
kV
RMS
RX and TX of DCAN1 can also be multiplexed as RTS# and CTS# for the RS-485 interface. In this case DCAN1 is not available. See
the following table for the corresponding assembly options.
Table 38:
Placement options for DCAN1_TX and DCAN1_RX
Signal
R416
R417
R418
R419
DCAN1_RX at DCAN1.RX
0 Ω
NP
DCAN1_RX at UART0.RTS#
NP
0 Ω
X
DCAN1_TX at DCAN1.TX
0 Ω
NP
DCAN1_TX at UART0.CTS#
X
NP
0 Ω
2:
500 V @ 60 Hz for 1 min; 1kV for 1 second.