ST10F273E datasheet(75/179 Pages) STMICROELECTRONICS

75 / 179 page

ST10F273E

CAN modules

75/179

17.2

CAN bus configurations

Depending on application, CAN bus configuration may be one single bus with a single or

multiple interfaces or a multiple bus with a single or multiple interfaces. The ST10F273E is

able to support these two cases.

Single CAN bus

The single CAN Bus multiple interfaces configuration may be implemented using two CAN

transceivers as shown in

Figure 11.

Connection to single CAN bus via separate CAN transceivers

The ST10F273E also supports single CAN Bus multiple (dual) interfaces using the open

drain option of the CANx_TxD output as shown in

Figure 12. Thanks to the OR-Wired

Connection, only one transceiver is required. In this case the design of the application must

take in account the wire length and the noise environment.

Figure 12.

Connection to single CAN bus via common CAN transceivers

CAN1

CAN_H

CAN_L

CAN bus

CAN2

XMISC.CANPAR = 0

CAN

transceiver

P4.4

P4.7

P4.5

P4.6

OD = Open Drain Output

+5V

CAN

CAN_H

CAN_L

CAN bus

2.7kW

transceiver

XMISC.CANPAR = 0

CAN1

CAN2

P4.4

P4.7

P4.5

P4.6

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