Seco SBC-C20 User Manual page 23

ETH _MDI3+/ ETH _MDI3-: Ethernet Controller Media Dependent Interface (MDI) I/O differential pair #3. It is the fourth differential pair in Gigabit Ethernet mode; it is
not used in 10/100Mbps modes.
LED Driver connector
SBC-C20 by iMX8M allow the direct control of LCD LED units. This functionality is allowed by WLED Controller p/n MP3385GR-Z driven by I2C interface of iMX8.
This functionality is ensured by connector CN15, which is a 6-pin FFC/FPC connector, type HR P/N A1253WR-SF-06P, whose pinout is available in the table.
LED Driver connector CN15
Pin Signal
1 V_LED+
2 V_LED+
3 V_LED1-
4 V_LED2-
5 V_LED3-
6 V_LED4-
I2C Touch Screen connector
SBC-C20 by iMX8M allow the control of a display touch screen, functionality integrated and controlled directly from iMX8M processor.
I2C T/S connector CN17
Pin Signal
1 VDD_3P3V
2 TOUCH_SCREEN_IRQ
3 TOUCH_SCREEN_SDA
4 TOUCH_SCREEN_SCL
5 TOUCH_SCREEN_RST
6 GND
SBC-C20
SBC-C20 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R. - Reviewed by C.M. -Copyright © 2020 SECO S.p.A.
Signal description:
V_LED+: Output voltage for LED strings. Connect the LED strings anode (common node) to this signal.
V_LED1-: LED string 1 current input. V_LED1- is the open-drain output of an internal dimming control
switch. Connect the LED string 1 cathode to this pin.
V_LED2-: LED string 2 current input. V_LED2- is the open-drain output of an internal dimming control
switch. Connect the LED string 2 cathode to this pin.
V_LED3-: LED string 3 current input. V_LED3- is the open-drain output of an internal dimming control
switch. Connect the LED string 3 cathode to this pin.
V_LED4-: LED string 4 current input. V_LED4- is the open-drain output of an internal dimming control switch. Connect the
LED string 4 cathode to this pin.
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 51021-0600 receptacle with MOLEX 50079-8000 female crimp terminals.
Signal description:
TOUCH_SCREEN_IRQ: VDD_3P3V electrical level input with a 10k pull-up resistor. This signal can be
used to serve the interrupt request of an eventual external Touch Screen connected to the dedicated I2C interface.
TOUCH_SCREEN_SDA: I2C Bus data line. Bidirectional signal, electrical level VDD_3P3V
managed by I2C channel #3 of iMX8M chipset.
TOUCH_SCREEN_SCL: I2C Bus clock line. Output signal, electrical level VDD_3P3V
managed by I2C channel #3 of iMX8M chipset.
TOUCH_SCREEN_RST: VDD_3P3V
a reset of an eventual external Touch Screen connected to the dedicated I2C interface.
-up resistor. It is
pull-up resistor. It is
-down resistor. This signal can be used to drive
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