4.5
RS232 and LIN
Two serial communication channels are available; U10 is a dual RS232 driver and receiver (see
).
Figure 8.
RS232 section
R1 IN
13
R2 IN
8
T1 IN
11
T2 IN
10
GND
15
V+
2
V-
6
VCC
16
R1 OUT
12
R2 OUT
9
T1 OUT
14
T2 OUT
7
C1+
1
C1 -
3
C2+
4
C2 -
5
U10
ST3232EBTR
C95
470nF/16V
GND
C96
470nF/16V
C93
100nF/50V
C94
470nF/16V
VDD_HV_IO_Main
GND
GND
Rx_A
Rx_B
Tx_B
Tx_A
C97
100nF/50V
R81
10kΩ
R80
10kΩ
SB15
Open
SB16
Open
Tx2
Rx2
VDD_HV_IO_Main
GND
Rx1
Tx1
SCI_4_TX
SCI_4_RX
SCI_0_TX
SCI_0_RX
VDD_HV_IO_Main
VDD_HV_IO_Main
TP26
Rx1
TP30
GND
GND
TP27
Tx1
SCI_ChB
SCI_ChA
1
2
3
4
5
6
7
8
X6
HEADER 4X2
VDD_HV_IO_Main
TP28
Rx2
TP29
Tx2
GND
1
2
3
JP7
SCI_RX_Sel
1
2
3
JP6
SCI_RX_Sel
R1_OUT
T1_IN
RXD_USB
TXD_USB
Default: 1-2
Default: 1-2
The
shows the LIN circuit; JP38 allows setting master/slave mode.
Figure 9.
LIN section
1
2
3
4
5
6
7
8
X7
HEADER 4X2
V_EXT
TXD
4
RXD
1
NWAKE
3
NSLP
2
INH
8
BAT
7
LIN
6
GND
5
U11
TJA1020/1021
GND
GND
C98
1nF/16V
C99
220pF/16V
R82
10kΩ
TP31
LIN
C100
100nF/50V
GND
TP32
GND
NLSP
LIN6_TX
LIN6_RX
GND
V_Ext
V_Ext
JP39
Open
LIN
1
2
3
JP38
LIN Master/Slave
D3
BAS40
LIN_TX
LIN_RX
R122
0R
GND
Not Assembled
R123
1k
4.6
CAN and ISO CAN-FD
Two CAN channels are available, both are based on a fast transceiver; the implemented solution is compatible
with the CAN-FD operation standard.
The jumper JP2 allows the selection in normal o standby mode:
•
No jumper: normal operation
•
Jumper 2-3: device in standby mode (manual or fixed selection)
•
Jumper 1-2: microcontroller drives the standby (dynamic configuration)
•
Jumper JP1 enables the load termination
1. In the transceiver, an internal pull-up resistor is already present and R1 could be removed.
4.7
Ethernet
JP5 allows connecting the Ethernet transceiver to the microcontroller to implement RII or MII communication
protocol.
JP5 allows the implementation of another feature: its pins allow plugging an addition board to evaluate the
communication performance by using a different Ethernet physical layer.
The R29 ÷ R32 are the load termination resistors.
Note:
The level of the transceiver in/out pins is 3.3 V then the microcontroller supply level must be set consequently.
UM2462
RS232 and LIN
UM2462
-
Rev 3
page 8/25
