NXP Semiconductors MPC5746R - Page 46

MPC5746R Hardware Design Guide, Rev. 1
Example Communication Peripheral connections
NXP Semiconductors46
10.3.2 Low-speed CAN TJA1054 interface
The figure below shows the typical connections for the physical interface between the MCU and the CAN
bus for low-speed applications using the NXP TJA1054 LS CAN transceiver. Optionally, the standby and
enable pins can be connected to MCU GPIO pins for additional control of the physical interface.
Figure 30. Typical low-speed CAN circuit using TJA1054
NOTE
Decoupling shown as an example only. STB and EN should be pulled high
for Normal mode. These signals can optionally be connected to MCU GPIO
pins to allow MCU control of the physical interface.
The table below describes the TJA1054 pins and system connections.
Table 25. TJA1054 Pin Definitions and System Connections
Pin Name Direction Full Pin Name Connection Description
1 INH Input Inhibit
Typically not
connected.
Inhibit output for control for an external
power supply regulator if a wake up
occurs.
2 TXD Input Transmit data MCU CAN TXD CAN transmit data input from the MCU
3 RXD Output Receive data MCU CAN RXD CAN receive data output to the MCU
4ERR
Output Error MCU GPIO
The error signal indicates a bus failure in
normal operating mode or a wake up is
detected in Standby or Sleep modes.