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
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HDMI_CTRL_CLK: DDC Clock line for HDMI panel. Bidirectional signal, +3.3V_RUN electrical level with a 1.5
-up resistor
HDMI_CTRL_DAT: DDC Data line for HDMI panel. Bidirectional signal, +3.3V_RUN
-up resistor
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 conn voltage level shifters on the carrier board.
D7
SL04
R4
R-2K2
C3
CC-100nF
Q2
2N7002
Q3
2N7002
T
TMDS_TX2-
T
TMDS_TX1-
T
+3.3V_A
TMDS_TX0-
R2
R-27K
T
D1
1PS79SB40
TMDS_CLK-
Q1
2N7002
D2
IP4283CZ10-TBA
1
3
2
5
4
8
10
9
7
6
HDMI_CTRL_CLK
HDMI_CTRL_DAT
U1
SN74LVC1G14DBVR
2
3
4
5
L1
BLM18PG121SN1
TYPE A
GND
CN1
WHDM-19D5L1BF3U4W
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
D3
IP4283CZ10-TBA
1
3
2
5
4
8
10
9
7
6
HDMI_HPD#
+5V_HDMI
+5V_HDMI
+3.3V_S
+5V_S
+3.3V_S
+5V_HDMI
L2
BLM18PG121SN1
R5
R-1K
R6
R-20K
HDMI_CEC
+3.3V_S
R3
R-2K2
+5V_HDMI
D5
IP4221CZ6-S
1
2
3
5
6
4
C1
CC-100nF
L3
BLM18PG121SN1
HDMI_DDC_CLK_L
HDMI_DDC_DATA_L
C2
CC-1uF
