SM-B79
SM-B79 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R - Reviewed by M.B. - Copyright © 2021 SECO S.p.A.
41
3.3.5
HDMI / DP1++ connectors
According to SMARC
®
Rel. 2.1.1 specification, the secondary display interface from card edge
connector can be used to implement multi-purpose Digital Display Interfaces.
The secondary display interface can support native HDMI video interface. Alternatively, the
same pins can be used to support one multimode display port, that can be either used as DP
or HDMI interface. It also allows the use of DP++ to HDMI dongles.
Please notice that the effective support of this kind of displays depends only by the SMARC
®
module used with the SM-B79 carrier board, it is not a feature dependent from the carrier board
itself.
The pin-out of this card edge connector is given according to SMARC
®
Rel 2.1.1 specifications,
so that the carrier board is ready for the use of any SMARC
®
module that follows those
specifications. Please refer to the SMARC
®
panels supported and the availability of the HDMI / DP++ signals.
SM-B79 board allows to interface to HDMI display, using the HDMI channel coming directly
from the SMARC
®
module connector. This interface will be available on a standard certified
HDMI connector CN79, type A, model MOLEX p/n 2086581001, with the pinout shown in the
table on the left
Signals involved in HDMI management are the following:
H_CON / HDMI_CLK-_CON: SMARC
®
module HDMI differential Clock.
_CON / HDMI_D0-_CON: SMARC
®
module HDMI differential pair #0.
_CON / HDMI_D1-_CON: SMARC
®
module HDMI differential pair #1.
_CON / HDMI_D2-_CON: SMARC
®
module HDMI differential pair #2.
HDMI_DDC_DAT_CON: DDC Data line for HDMI panel. Bidirectional signal, electrical level +5V
HDMI
with
up resistor
HDMI_DDC_CLK_CON: DDC Clock line for HDMI panel. Bidirectional signal, electrical level +5V
HDMI
with
up resistor
HDMI_HPD_CON: Hot Plug Detect Input signal. Active high signal, +5V_RUN electrical level
+5V
HDMI
:
Power voltage reference for HDMI, directly derived from +5V_RUN.
For ESD protection, on all data and voltage lines are placed clamping diodes for voltage transient suppression.
Always use HDMI-certified cables for the connection between the board and the HDMI display; a category 2 (High-Speed) cable is recommended for higher
resolutions, category 1 cables can be used for 720p resolution.
HDMI Connector CN79
Pin Signal
Pin Signal
1
_CON
2
GND
3
HDMI_D2-_CON
4
_CON
5
GND
6
HDMI_D1-_CON
7
_CON
8
GND
9
HDMI_D0-_CON
10
H_CON
11
GND
12
HDMI_CLK-_CON
13
---
14
---
15
HDMI_DDC_CLK_CON
16
HDMI_DDC_DAT_CON
17
GND
18
+5V
HDMI
19
HDMI_HPD_CON