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HDMI+DP++ Connector - CN21 (factory alternative)
Pin
Signal
Pin
A1
TMDS_LANE2+
A3
TMDS_LANE2-
A5
GND
A7
TMDS_LANE0+
A9
TMDS_LANE0-
A10
A11
GND
A12
A13
HDMI_CEC
A14
A15
SCL
A16
A17
GND
A18
A19
HPD
B1
DP_LANE0+
B3
DP_LANE0-
B5
GND
B7
DP_LANE2+
B9
DP_LANE2-
B10
B11
GND
B12
B13
CAD
B14
B15
DP_CLK_AUX+
B16
B17
DP_DAT_AUX-
B18
B19
GND
B20
DP_HPD: DP Hot Plug Detect Input signal. +3.3V_RUN
CAD: This signal is used to automatically configure DP or HDMI interface on DP++ connector. When a DP cable is connected, then the CAD signal remains floating.
The internal circuitry will recognize this configuration, making available the Display Port Auxiliary channel signals on pins B15/B17. Instead, when a DP-to-HDMI
adapter is connected, it will drive opportunely the CAD signal, making available HDMI_CTRL_CLK and HDMI_CTRL_DAT signals on the previous pins.
SBC-C41-pITX
SBC-C41-pITX User Manual - Rev. First Edition: 1.0 - Last Edition: 1.1 - Author: A.R./S.B. - Reviewed by M.B. Copyright © 2021 SECO S.p.A.
Signal
A2
GND
A4
TMDS_LANE1+
A6
TMDS_LANE1-
A8
GND
TMDS_CLK+
TMDS_CLK-
---
SDA
+5V
HDMI
B2
GND
B4
DP_LANE1+
B6
DP_LANE1-
B8
GND
DP_LANE3+
DP_LANE3-
DP_CEC
GND
DP_HPD
DP_PWR
As a factory alternative, it is possible to have two video outputs, i.e. a
standard HDMI interface and a multimode Display Port Interface.
In this latest case, these interfaces will be available on a combo HDMI
+ DP++ connector, CN21, type Freeport p/n 62EHDS-30AN0-P1-D.
DDI Interface #0 will be available on the HDMI connector, while DDI
interface #1 will be available on the DP++ connector (see image on
the left).
Signals involved in HDMI and DP++ management are the following:
TMDS_CLK+/TMDS_CLK-: TMDS differential Clock.
TMDS_LANE0+/TMDS_LANE0-: TMDS differential pair #0
TMDS_LANE1+/TMDS_LANE1-: TMDS differential pair #1
TMDS_LANE2+/TMDS_LANE2-: TMDS differential pair #2
SDA: DDC Data line for HDMI panel. Bidirectional signal, electrical level +5V
pull-up resistor.
SCL: DDC Clock line for HDMI panel. Output signal, electrical level +5V
resistor.
HDMI_CEC: HDMI Consumer Electronics Control (CEC) Line. Bidirectional signal, electrical level
+3.3V_ALW
-up resistor.
HPD: HDMI Hot Plug Detect Input signal.
DP_LANE0+/DP_LANE0-: Display Port differential data pair #0
DP_LANE1+/DP_LANE1-: Display Port differential data pair #1
DP_LANE3+/DP_LANE3-: Display Port differential data pair #2
DP_LANE4+/DP_LANE4-: Display Port differential data pair #4
DP_CLK_AUX+/DP_DAT_AUX-: Display Port auxiliary channel differential data pair / DDC Clock
and Data Line for HDMI panels. See CAD signal description.
DP_CEC: DP Consumer Electronics Control (CEC) Line. Bidirectional signal, electrical level
+3.3V_ALW
-up resistor.
-down resistor
HDMI
-up
HDMI
25
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