Table 17. TJA1054 pin definitions and example system connections (continued)
Pin
number
Pin name
Pin
direction
Full pin
name
MCU or system
connection
Description
6
EN
Input
Enable
MCU GPIO
Enable input for the device. It is also
used in conjunction with the STB pin to
determine the mode of the transceiver.
7
WAKE
Input
Wake
Typically not connected
Wake input (active low), both falling and
rising edges are detected.
8
RTH
Input
Termination
Resistor
High
Resistor to CANH
Termination resistor for the CAN bus
high
1
9
RTL
Input
Termination
Resistor
Low
Resistor to CANL
Termination resistor for the CAN bus
low
1
10
VCC
Input
Voltage
Supply
5 volts
Digital IO supply voltage, 5 volts.
11
CANH
Output
CAN Bus
High
CAN Bus Connector
CAN bus high pin.
12
CANL
Input/
Output
CAN Bus
Low
CAN Bus Connector
CAN bus low pin.
13
Ground
Output
Ground
Ground
Ground return termination path.
14
BAT
Input
Standby
Battery voltage
Battery supply pin, nominally 12 V.
1. This allows the transceiver to control the CAN bus impedance under an error condition.
8.2.3 Recommended CAN connector
Generally, DB9 connectors are used for evaluation boards to connect CAN modules together, whereas there are various
connectors used for production hardware.
Figure 11
and
Table 18
show a typical example of the connector pinout. A male
type connector is used on the evaluation board and a female type cable connects with it.
Example communication peripheral connections
Hardware Design Guide, Rev. 0, 2012
20
Freescale Semiconductor, Inc.
