Lin-Transmission - Renesas V850E2/Px4 Manual

Chapter 3
3.1.2
Table 3-3
Table 3-4
Note
R20UT0883ED0100 Rev. 1.00
User Manual

LIN-Transmission

For LIN transmission some jumper settings have to be done to disconnect the
UART signals and connect the LIN signals to the microcontroller and the D-sub
connector.
To set/clear all needed connections please use the jumper settings of Table 3-3.
LIN bus signal jumpers
Signal
LIN GND
LIN RXD
UART RX EN ¯¯
In detail, the following three settings are done:
- P1 connects pin 3 (RxD signal for UART) of the D-sub connector with ground.
- PJ30 connects the RxD signal of the LIN-transceiver to the microcontroller.
- JP5 set the RxD output of the UART-transceiver to Hi-Z to enable the LIN-
transceiver to drive the signal path.
LIN control signal
Signal
LIN NSLP
To enable the LIN transceiver (IC3) the NSLP pin of the transceiver must be
pulled high. Closing jumper JP3 will connect the NSLP pin to VDD.
The RXD pin of the LIN transceiver (pin #1; IC3) is an open drain output. The
necessary pull-up resistor, in order to interface to the Px4 device, is not
assembled on the board. To enable operation of the RXD signal user has either
- connect an appropriate pull up resistor to the related RXD input pin of the LIN
channel,
or
- enable the internal Pull-Up resistors available in the Px4 devices for the LIN
input pin.
For additional information on the LIN transceiver, please have a look into its
User Manual/Datasheet (Philips, TJA1020).
Connector Pin #
P1 1 – 2
JP30 1 – 2
JP5 1 – 2
Connector Pin #
JP3 1 – 2
Communication
13