Freescale Semiconductor MPC5748G EVB, User Manual, Page: 19 / 88

Communications & Memory Interfaces:
MPC5748G EVB User Guide, User Guide, Rev. 0, 08/2015
Freescale Semiconductor, Inc. 19
The LIN0 and LIN1 MCU TX/RX signals are jumpered as shown in the following to allow the
transceivers to be isolated from the respective MCU pin if desired. The default configuration is with all
jumper headers fitted routing the TX and RX signals to the MCU.
Each transceiver also has a master mode enable jumper which is fitted by default to configure the
transceiver for Master mode. To configure the transceiver for slave mode, remove the respective
“Master_EN” jumper.
Table 12. LIN Control Jumpers (J10, J11, J12, J13)
Jumper Position PCB Legend Description
J10 (LIN0)
Posn 1-2
FITTED ( D )
RX
MCU LIN0_RX signal (PB3) is routed to LIN0 interface
Removed
MCU LIN0_RX signal (PB3) is not routed to LIN0 interface
J10 (LIN0)
Posn 3-4
FITTED ( D )
TX
MCU LIN0_TX signal (PB2) is routed to LIN0 interface
Removed
MCU LIN0_TX signal (PB2) is not routed to LIN0 interface
J11
(Master_EN)
FITTED ( D )
LIN0 is configured in Master Mode
Removed
LIN0 is configured in Slave Mode
J12 (LIN1)
Posn 1-2
FITTED ( D )
RX
MCU LIN1_TX signal (PC7) is routed to LIN1 interface
Removed
MCU LIN1_TX signal (PC7) is not routed to LIN1 interface
J12 (LIN1)
Posn 3-4
FITTED ( D )
TX
MCU LIN1_RX signal (PC6) is routed to LIN interface
Removed
MCU LIN1_RX signal (PC6) is not routed to LIN interface
J13
(Master_EN)
FITTED ( D )
LIN1 is configured in Master Mode
Removed
LIN1 is configured in Slave Mode
NOTE
Care should be taken when fitting the jumper headers to the 2x2 jumper
blocks J10 and J12 as they can easily be fitted in the incorrect orientation.
Jumper headers should be fitted
horizontally
The LIN TX / RX MCU pins are powered from the VDD_HV_A domain, which is configured between
3.3V and 5.0V on the daughtercard using jumper J5. The LIN transceivers enable pin is connected to the
PER_HVA net configured with jumper J24 on the main EVB. Care must be taken to ensure that the
MCU VDD_HV_A and PER_HVA supplies are the same when using the LIN transceiver.
Note that in order for the LIN transceiver to function, external power must be supplied via pin 3 of the
molex connector as detailed in Figure 10.
6.3. USB RS232 Serial Interface (P17, J16)
The EVB 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 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 via a 2-way jumper header (J16) allowing the
transceiver to be isolated from the MCU pin if desired. The default configuration is with the jumper
The USB RS232
interface is on the
left hand edge of the
board (USB Type B
socket)