Q7-974
Q7-974 User Manual - Rev. First Edition: 0.1 - Last Edition: 2.3 - Author: S.B. - Reviewed by G.G. Copyright © 2017 SECO S.r.l.
22
3.2
Connectors description
3.2.1
VGA Connector
Qseven
®
specifications Rel. 2.0 define an area, on the PCB, that can be
used to place optional I/O connectors of any kind.
For this reason, on Q7-974 board, there is an additional connector,
which carries out VGA interface coming out from Intel
®
Atom E38xx
SOCs.
Considering that this series of SOCs are able to manage up to two independent displays, it is
possible this way to have many possible combinations of display, using this VGA connector,
LVDS or eDP interface and HDMI / DP ++ interfaces available on Qseven
®
golden finger (type
of interfaces available depends on the module
’
s confirguation purchased).
VGA connector is an FFC/FPC connector, top contacts, type HIROSE FH12A-12S-0.5SH(55),
with pinout shown in the table on the left.
Connector mates with 0.5mm pitch 12-poles FFC cables.
Here following the VGA signals
’
description:
CRT_RED: Intel
®
Atom E38xx SoC internal DAC
’
s Red Signal video output. A 150
Ω
pull-down resistor is placed on the line.
CRT_GREEN: Intel
®
Atom E38xx SoC internal DAC
’
s Green Signal video output. A 150
Ω
pull-down resistor is placed on the line.
CRT_BLUE: Intel
®
Atom E38xx SoC internal DAC
’
s Blue Signal video output. A 150
Ω
pull-down resistor is placed on the line.
CRT_HSYNC: Intel
®
Atom E38xx SoC internal DAC
’
s Horizontal Synchronization output signal.
CRT_VSYNC: Intel
®
Atom E38xx SoC internal DAC
’
s Vertical Synchronization output signal.
CRT_DDC_CLK: Intel
®
Atom E38xx SoC internal DAC
’
s DDC Clock line for VGA displays detection. Output signal, electrical level +3.3V_S, 2k2
Ω
pull-up resistor.
CRT_DDC_DATA: Intel
®
Atom E38xx SoC internal DAC
’
s DDC Clock line for VGA displays detection. Bidirectional signal, electrical level +3.3V_S, 2k2
Ω
pull-up
resistor.
Please be aware that for the connection to external VGA displays, adapter circuitry is needed; it will provide for ESD protection, voltage level shifting for DDC,
filtering for reduction of noise and EMI, and so on.
Optionally, SECO can provide a dedicated VGA adapter, able to carry out the signals coming out from connector CN1 to a standard DB-15 HD VGA connector.
The adapter is also provided with necessary FFC cable, length 20cm. Please check chapter 5.2.1 for further details.
VGA Connector - CN1
Pin Signal
Pin Signal
1
CRT_RED
7
CRT_HSYNC
2
GND
8
CRT_VSYNC
3
CRT_GREEN
9
+5V_S
4
GND
10
CRT_DDC_CLK
5
CRT_BLUE
11
CRT_DDC_DATA
6
GND
12
GND
