THEMIS
THEMIS User Manual - Rev. First Edition: 1.0 - Last Edition: 2.2 - Author: A.R. - Reviewed by S.R. -Copyright © 2022 SECO S.p.A.
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3.3
Connectors description
HDMI Connectors
NXP i.MX8 family of processor has an embedded HDMI technology Tx
module, which provides an HDMI interface for compliant displays.
For this reason, on THEMIS board there is the possibility of connecting one
HDMI display, using a certified HDMI Micro Connector (Type D), CN28, type FCI p/n 10118242-
001RLF.
Signals involved in HDMI Tx management are the following:
H/HMDI_CLK-: TMDS differential Clock.
H/ HDMI_TX0-: TMDS differential pair #0
H/ HDMI_TX1-: TMDS differential pair #1
H/ HDMI_TX2-: TMDS differential pair #2
HDMI_TX_SDA: DDC Data line for HDMI panel. Bidirectional signal, electrical level +5V
HDMI
with a
2k
Ω
pull-up resistor.
HDMI_TX_SCL: DDC Clock line for HDMI panel. Output signal, electrical level +5V
HDMI
with a 2k
Ω
pull-up resistor.
CEC: HDMI Consumer Electronics Control (CEC) Line. Bidirectional signal, electrical level
+3.3V_RUN with a 27k
Ω
pull-up resistor.
HPD: Hot Plug Detect Input signal. +3.3V_RUN electrical level signal with 1M
Ω
pull-down resistor.
+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 Standard HDMI Cable can be used for 720p resolution, while a
High-Speed HDMI Cable is recommended for higher resolutions.
HDMI Out Connector CN28
Pin Signal
Pin Signal
1
HPD
2
----
3
H
4
GND
5
HDMI_TX2-
6
H
7
GND
8
HDMI_TX1-
9
H
10
GND
11
HDMI_TX0-
12
H
13
GND
14
HDMI_CLK-
15
CEC
16
GND
17
HDMI_TX_SCL
18
HDMI_TX_SDA
19
+5V
HDMI
