5.2. LIN Interfaces (P6, P7)
The
LIN Physical
interface circuits are
located on the right
edge of the LCEVB
The LCEVB incorporates two LIN transceiver circuits connected to MCU LIN0 and LIN1, using an
NXP MC33662 transceiver. The MPC5748G LIN0 supports both master and slave modes whereas
LIN1 only supports master mode.
On the LCEVB, the LIN0 transceiver is configured as slave mode by default. Master mode operation is
possible by either populating a zero ohm resistor (R143) or buy fitting a jumper header (J2) – see the
schematics for details. The LIN0 transceiver is hard wired for master mode. To save on board space
and cost, both LIN transceivers are connected to 0.1” pitch 3x1 headers as shown below rather than the
usual LIN Molex header.
Figure 6. LIN Physical Interface Connector
Note that in order for the LIN transceiver to function, external 12v must be supplied via pin 2 of the
connector
5.3. USB RS232 Serial Interface (P11)
The USB RS232
interface is on the
left hand edge of the
board (USB Type B
The LCEVB incorporates a USB RS232 serial interface providing RS232 connectivity via a direct USB
connection between the PC and the EVB. The circuit contains an FTDI FT2232D USB to Serial
interface which should automatically install the drivers for two additional COM ports on your PC. Note
that only one of these ports is used so you will need to try both (usually the higher numbered COM port
is the active one). For more information on the USB drivers and general fault finding, consult the FTDI
website at
http://www.ftdichip.com/
The MCU LIN2 signals are routed to the FTDI transceiver (UART TX and RX). No handshaking
signals are implemented and no board configuration is required.
5.4. USB HOST Interface (P4)
The USB Host
interface is on the
top left corner of the
LCEVB on the left
The LCEVB includes a Type A (Host) USB interface, routed to a USB type A female connector.
The USB circuit contains a USB83340 transceiver with a MIC2026-1YM USB power switch. There
is no hardware user configuration required to use the USB circuit.
MPC5748G Low Cost EVB User Guide, Rev. 1, 08/2016
12
NXP Semiconductors
GND V
sup
LIN
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