SBC-C31
SBC-C31 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R. - Reviewed by D.T. - Copyright © 2021 SECO S.p.A.
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3.3.14
LED Driver Connector
SBC-C31 by RK3399 allow the direct control of LCD LED backlights.
The functionality is implemented using an optional 4-Channel WLED controller type MPS MP3385GR-Z
driven by I2C interface #2 of RK3399 processor.
Through this connector, it is possible to connect up to 4 LED strings requiring a max of 68mA 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
V_LEDx-: LED String x Cathode Input
3.3.15
Serial Ports Connector
Onboard, connector CN6 carries out signals related to UART #2 interface from RK3399 processor.
This interface can be used for the debugging of Cortex-A53 processors.
For this purpose, a dedicated 4-pin Connector, Type MOLEX p/n 53398-0471 or equivalent is
provided. Mating connector: MOLEX 51021-0400 receptacle with MOLEX 50079-8000 female
crimp terminals.
A53_DUART_TX: UART port #2 Transmit signal, +3.3V_ALW electrical level
A53_DUART_RX: UART port #2 Receive signal, +3.3V_ALW electrical level
3.3.16
Power and Reset Header
SC31 board can offer a dual push-button Switch SW1 (P/N HY-1102HLT-A95B50) for the On/Off and System Reset functionalities.
Upper push button is used for On/Off, while lower push button is used for Reset.
Please be aware that the dual push button switch is available only on board in commercial temperature range,
since it cannot sustain the full industrial temperature range.
Independently by the temperature range of the module purchased, it is always available an additional
connector, CN3, which can be used to connect remote pushbuttons for System Reset and On/Off
functionalities. CN3 is a Molex 1.25mm pitch, 3-pin header, Type MOLEX p/n 53398-0371 or
equivalent. Mating connector: MOLEX 51021-0300 receptacle with MOLEX 50079-8000 female
crimp terminals.
LED Driver connector CN46
Pin Signal
1
V_LED+
2
V_LED+
3
V_LED1-
4
V_LED2-
5
V_LED3-
6
V_LED4-
A53 Debug UART Connector CN6
Pin Signal
1
+3.3V_ALW
2
A53_DUART_RX
3
A53_DUART_TX
4
GND
ON/OFF and Reset Connector CN3
Pin
Signal
1
510Ohm Pull-up to +5V_RUN
2
GND
3
ONOFF
4
GND
5
RST
