ip4778cz38/v NXP Semiconductors, ip4778cz38/v Datasheet - Page 18

• Manufacturer Part Number: ip4778cz38/v
• Description: Hdmi Esd Protection, Ddc Buffering And Hot Plug Control
• Manufacturer: NXP Semiconductors

NXP Semiconductors
IP4778CZ38_1
Objective data sheet
Fig 15. Application showing optimized PCB microstrip lines
HOT_PLUG_DET_IN
10.8 Typical application
DDC_DAT_IN
DDC_CLK_IN
TMDS_CLK+
TMDS_CLK
TMDS_D2+
TMDS_D2
TMDS_D1+
TMDS_D1
TMDS_D0+
TMDS_D0
CEC_IN
5.0 V
GND
GND
GND
GND
This application ensures that the EDID (stored in the EEPROM) can be read out in
Standby mode, even if long cables are used, to guarantee correct CEC wake-up handling.
To wake up the system from Standby to normal operation, the HDMI source has to first
read the EDID in order to hand over the port ID via the CEC protocol. This ensures that
the HDMI starts up and switches to the correct HDMI port to display the HDMI source
which initiated the CEC wake-up sequence.
The CEC bus is enabled by activating the V
The RF routing optimized pin position variant allows optimum design layout of the RF
routing micro strips to ensure that the impedance of the TMDS lines remain within the
specification limits. Part of the microstrips comprise a solid ground plane which is located
beneath the device.
enable
R data
1.5 k
+3.3 V
R clock
1.5 k
R CEC
100 k
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
IP4778CZ38
Rev. 01 — 10 April 2008
R CEC
27 k
HDMI ESD protection, DDC buffering and hot plug control
R clock
47 k
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
R data
47 k
CC(3V3)
8 7 6 5
1 2 3 4
EEPROM
3.3 V stand by
standby supply.
R DDC
100
connector
1
19
HDMI
IP4778CZ38
TMDS_D2+
TMDS_GND
TMDS_D2
TMDS_D1+
TMDS_GND
TMDS_D1
TMDS_D0+
TMDS_GND
TMDS_D0
TMDS_CLK+
TMDS_GND
TMDS_CLK
CEC
n.c.
DDC_CLK
DDC_DAT
GND
+5 V
HOT_PLUG_DET
© NXP B.V. 2008. All rights reserved.
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