Seco SBC-D23 User Manual page 31

BKL_EN: +3P3V_SW electrical level Output with 50kΩ pull-down resistor, Backlight Enable signal. It can be used to turn On/Off the backlight's lamps of connected
displays.
PANEL_ON: +3P3V_SW electrical level Output with 100kΩ pull-down resistor, Panel Power Enable signal. It can be used to turn On/Off the connected display.
DISPLAY_BKL_CTRL: this signal can be used to adjust the backlight brightness in displays supporting Pulse Width Modulated (PWM) regulations (+3P0V_VDD_PMU
electrical level with 100kΩ pull-down resistor).
TOUCH_RST#: This signal can be used to drive a reset of an eventual external Touch Screen connected to the dedicated I2C interface. It is managed on the SBC-
D23 board by one GPIO of the on-board I/O Expanders. Electrical level +3P3V_SW.
TOUCH_INT#: This signal can be used to serve the interrupt request of an eventual external Touch Screen connected to the dedicated I2C interface. It is managed
on the SBC-D23 board by one GPIO of the on-board I/O Expanders. Electrical level +3P3V_SW with a 10
CN10 position LCD Power selector
1-2 +3.3V
2-3 +5V
CN12 position Backlight Power selector
1-2 +5V
2-3 +12V
Since the use of jumpers in environments with vibrations issues could be a problem, it is possible to provide SD23 boards with the LCD Power and Backlight Power
fixed at the desired value. For this purpose, some dedicated 0-Ohm resistors can be mounted (factory default: not available). Please contact your local Sales rep in
case you need this special configuration.
3.3.7 LED Driver Connector
Backlight connector CN20
Pin Signal
1 V_LED+
2 V_LED+
3 V_LED1-
4 V_LED2-
5 V_LED3-
6 V_LED4-
SBC-D23
SBC-D23 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: S.B. - Reviewed by P.Z. - Copyright © 2021 SECO S.p.A.
VCC_LCD_SW: LCD switched voltage rail. Its value can be set to +3P3V_SW or +5V_STBY by
using dedicated jumper CN10, which is a standard pin header, P2.54mm, 1x3 pin.
VCC_BKL_SW: Backlight switched voltage rail. Its value can be set to +5V_STBY or +12V_ALW by
using dedicated jumper CN12, same type of CN10.
Please be aware that with VIN voltages between +12V and +16VDC, the VCC_BKL_SW will not be equal to
+12VDC but it will be equal to VIN Voltage.
SD23 board also allow the connection of LVDS Displays requiring a dedicated LED Driver.
The functionality is implemented using a 4-Channel WLED controller type MPS MP3385GR-.
Through this connector, it is possible to connect up to 4 LED strings requiring a max of 90mA per string (60V
max voltage).
The connector is a 4-pin 1.25mm pitch connector, type HR P/N A1253WR-SF-06P, with the pinout indicated
in the table on the left.
Mating connector: HR P/N A1253H-06P with female crimp contacts type HR P/N A1253-TPE or A1253-GPE
V_LED+: Strings' common LED Anode output
-down resistor
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