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Hardware
UM0193
1.3 CAN
interface
The L9616 High-Speed Transceiver provides the Controller Area Network (CAN)
communication interface through the CAN0 channel of the STR730F microcontroller.
This serial communication can reach speeds up to 1Mbps.
A male, 9-pin D-Sub connector (J15) provides the CAN connection. The CAN channel can
be terminated with a 120
Ω
resistor using jumper J14 as described in
. The L9616 CAN transceiver has an Adjustable Slope Control (ASC) feature that
sets the slope speed using its ASC pin. This pin can be either hard-connected high or low
using zero-ohm resistors or it can be controlled by MCU Port 2.0 as shown in
describes the resistor assembly and control pin signal levels for CAN
communications.
Figure 6.
CAN schematic diagram
Table 3.
CAN Connections
J15 Pin
Signal
STR730F MCU
Peripheral
RxD (Receive Data)
Port 1.14
CAN0
TxD (Transmit Data)
Port 1.15
CAN0
ASC (Adjustable Slope Control)
Port 2.0
CAN0
2
CAN Low differential data
7
CAN High differential data
3
Shorted to 6. Connected to GND by R35 / 0
Ω
6
Shorted to 3. Connected to GND by R35 / 0
Ω
1, 4, 5, 8 and 9
Not connected
Shielding
Connected to GND by R36 || C28 (100 k
Ω
|| 4.7 nF)
Ai11695
5V
5V
5V
C28
C28
1
2
3
4
5
6
7
8
U5
R
R36 M1
R
R35 0R
1
2
3
4
5
6
7
8
9
M1
M2
1
2
DSUB9 - Plug
4n7/500V
C27
100 nF
RX1_Ref
CAN_L
CAN_H
VS
TX0
RX0
ASC
GND
L9616
R34
0R
NA
R33 120R
J14
J15
R32
0R
NA
TxD CAN
RxD CAN
ASC CAN