Example Communication Peripheral connections
MPC5746R Hardware Design Guide, Rev. 1
NXP Semiconductors 43
There is not a standard industry-defined LIN connector. NXP uses a 4-pin Molex© connector that allows
for the LIN bus pin, a power supply source (VPWR), a wakeup signal, and a ground reference. Slave nodes
will often implement two connectors to allow a daisy-chain of multiple nodes to be easily implemented.
Table 21 shows the NXP pin-out.
In a typical system, these pins would be used as follows:
• LIN bus – single-wire LIN bus that connects between the master LIN node and the slave LIN
nodes.
• VPWR – can be used as the power input to a slave node. Care should be taken that sufficient current
is available for the total number of LIN slaves that are powered through this connection. In some
systems, this may come from the master LIN node.
• Wake – typically used for each individual slave node to enable the LIN physical interface of that
node and to consequently enable the power supply (using the INH output) to power up the MCU
to perform some action. For example, when the handle on a car door is lifted, to turn on the MCU
that controls a function inside the vehicle, such as powering a smart dome light or enabling the
controls of a smart seat.
• Ground – ground reference for the module.
Part numbers for the 4-pin Molex connector are shown in Table 22.
8 INH Output Inhibit Output LIN Bus (if master)
The inhibit pin controls either an
external regulator to turn on a slave
node or is connected through a
resistor to the LIN bus or master
nodes.
1
WAKE is an optional signal on the LIN connector, but may come directly from a switch.
Table 21. LIN Connector Pinout Recommendation
Function Pin Number Pin Number Function
LIN Bus 4 3 VPWR
Wake 2 1 Ground
Table 22. Recommended Connector Part Numbers
Description Manufacturer Part Number (Molex)
4-pin right-angle connector with flange for target system, tin contacts, with latch 39-29-1048
4-pin right-angle connector with pegs for target system, tin contacts, with latch 39-29-1040
4-pin vertical connector with pegs for target system, tin contacts, with latch 39-29-9042
4-pin right-angle connector with flange for target system, gold contacts 39-29-5043
Table 20. MC33661 Pin Definitions and Example System Connections
Pin Number Pin Name Pin Direction Full Pin Name
MCU or System
Connection
Description
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