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HDMI_CTRL_CLK: DDC Clock line for HDMI panel. Bidirectional signal, +3.3V_RUN electrical level with a 1.5
HDMI_CTRL_DAT: DDC Data line for HDMI panel. Bidirectional signal, +3.3V_RUN
Since HDMI Tx module is embedded in the i.MX 8M processors, it is not necessary to implement voltage level shifter for TMDS differential pairs on the Carrier board.
It is still necessary, however, to implement voltage level shifters on Control data/Clock signals, as well as for Hot Plug Detect signal.
Voltage clamping diodes are also highly recommended on all signal lines for ESD suppression.
Please refer to the following schematics as an example of implementation of HDMI connection + voltage level shifters on the carrier board.
HDMI_CEC
+3.3V_S
Q2
2N7002
HDMI_CTRL_CLK
+3.3V_S
Q3
2N7002
HDMI_CTRL_DAT
+5V_S
D7
SL04
Q7-C25
Q7-C25 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Authors: S.B. and A.R - Reviewed by N.P. - Copyright © 2020 SECO S.p.A
+3.3V_A
D1
1PS79SB40
Q1
R2
2N7002
R-27K
TMDS_TX2+
TMDS_TX2-
TMDS_TX1+
TMDS_TX1-
TMDS_TX0+
+5V_HDMI
TMDS_TX0-
TMDS_CLK+
R3
R-2K2
TMDS_CLK-
L1
BLM18PG121SN1
HDMI_DDC_CLK_L
HDMI_DDC_DATA_L
+5V_HDMI
C1
R4
CC-100nF
R-2K2
L2
BLM18PG121SN1
+5V_HDMI
L3
BLM18PG121SN1
C2
C3
CC-1uF
CC-100nF
D2
IP4283CZ10-TBA
1
10
1
2
9
2
4
7
4
5
6
5
D5
5
1
3
4
2
6
+3.3V_S
IP4221CZ6-S
4
2
HDMI_HPD#
U1
SN74LVC1G14DBVR
-up resistor
-up resistor
D3
IP4283CZ10-TBA
10
9
7
6
CN1
TYPE A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
+5V_HDMI
19
GND
20
R5
21
R-1K
22
23
WHDM-19D5L1BF3U4W
R6
R-20K
32
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