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3.3.8 CAN Bus connector
Since i.MX6 processor includes a Flexible Controller Area Network (FlexCAN), on SBC-984 board it has been implemented also a CAN transceiver, for the direct
connection of the board to a CAN Bus network.
CAN Bus Connector - J6
Pin
Signal
1
CAN_H
2
GND
3
CAN_L
A 120Ω termination resistor is placed between CAN_H and CAN_L signals. It can be connected or disconnected from the line by using an analog switch, which is
managed via SW.
If necessary, SECO can provide for a DB-9 male adapter cable for direct connection of the module to an existing CAN Bus line. Please check par. 4.2.5.
3.3.9 Debug UART / I2C Touch Connector
Debug UART / I2C Touch
Connector - J7
Pin
Signal
1
+3.3V_A
2
I2C3_SCL
3
I2C3_SDA
4
GND
5
UART2_RX / TOUCH_IRQ
6
UART2_TX / TOUCH_RST#
by i.MX6 processor's I2C3 controller.
UART2_TX / TOUCH_IRQ: UART2 Interface, Serial data Transmit (output) line, 3.3V_S electrical level. Can be used as IRQ line for Touch Screen connection.
UART2_RX / TOUCH_RST#: UART2 Interface, Serial data Receive (input) line, 3.3V_S electrical level. Can be used as Reset signal for Touch Screen connection.
Please consider that UART debug interface is at TTL electrical level; therefore, please evaluate well the typical scenario of application. If it isn't explicitly required to
SBC-984
SBC-984 User Manual - Rev. First Edition: 1.0 - Last Edition: 4.0 - Author: S.B. - Reviewed by N.P. Copyright © 2016 SECO S.r.l.
This interface is compliant to CAN specifications rel. 2.0 part B. The transceiver used is designed for high-speed (up to 1Mbps)
CAN applications, and also offers improved EMC and ESD performances.
CAN Bus Connector is a 3-pin single line SMT connector, type MOLEX 53261-0371 or equivalent, with pinout
shown in the table on the left. Mating connector: MOLEX 51021-0300 receptacle with MOLEX 50079-8000 female
crimp terminals.
CAN_H: High-Level CAN bus line.
CAN_L: Low-Level CAN bus line.
Onboard, connector J7 is a mixed signals connector, which carries out signals related to Debug Serial
Port, which is managed by NXP i.MX6 UART2 internal controller, with signals available at TTL level.
Along with an I2C interface available on this same connector, the UART pins can also be used for I2C
Touch Screen controller connection, depending on the BSP programming.
The connector is a 6-pin MOLEX p/n 53398-0671 or equivalent, with pinout shown in the table on the
left. Mating connector: MOLEX 51021-0500 receptacle with MOLEX 50079-8000 female crimp
terminals.
Signals' description:
I2C3_SCL: I2C Bus clock line. Bidirectional signal, electrical level +3.3V_S with a 4k7Ω pull-up resistor. It is managed
by i.MX6 processor's I2C3 controller.
I2C3_SDA: I2C Bus data line. Bidirectional signal, electrical level +3.3V_S with a 4k7Ω pull-up resistor. It is managed
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