CM2020-01TR_11 Datasheet, PDF (8/9 Pages) ON Semiconductor – HDMI Transmitter Port Protection and Interface Device

CM2020−01TR
APPLICATION INFORMATION (Cont’d)
Design Considerations
5V Overcurrent Output
Maximum Overcurrent Protection output drop at 55 mA on 5V_OUT is 100 mV. To meet HDMI output requirements of
4.8 − 5.3 V, an input of greater than 4.9 V should be used (i.e. 5.1 V ±4%). A 0.1 mF ceramic bypass capacitor on this output
is also recommended.
Hotplug Detect Input
To meet the requirements of HDMI CTS TID7−12, the following pullup/pulldown configuration is recommended for a 3.3 V
±10% internal VCC rail (See Figure 4 below). A 0.1 mF ceramic capacitor is recommended for additional edge debounce and
ESD bypass.
DUT On vs. DUT Off
Many HDMI CTS tests require a power off condition on the System Under Test. Many Dual Rail Clamp (DRC) ESD diode
configurations will be forward biased when their VDD rail is lower than the I/O pin bias, thereby exhibiting extremely high
apparent capacitance measurements, for example. The MediaGuardt backdrive isolation circuitry limits this current to
< 5 mA, and will help ensure compliance.
LV_SUPPLY
RPU
47K
RPU
47K
RPU
47K
RPU
47K
D2+
D2−
D1+
D1−
D0+
D0−
CK+
CK−
CEC
DOC_CLK
DOC_DAT
HOTPLUG
HDMI ASIC
5V_SUPPLY
CM2020
1 5V
VOUT 38
2 LV BYPASS 37
3 GND
GND 36
4 D2+
D2+ 35
5 GND
GND 34
6 D2−
D2− 33
7 D1+
D1+ 32
8 GND
GND 31
9 D1−
D1− 30
10 D0+
D0+ 29
11 GND
12 D0−
GND 28
D0− 27
13 CK+
CK+ 26
14 GND
GND 25
15 CK−
CK− 24
16 CEC_I CEC−O 23
17 SCK_I SCK−O 22
18 SDA_I SDA−O 21
19 HPD_I HPD−O 20
OPTIONAL
CBYP
100 nF
RPD
15K
3.3 V
RCEC
27K
RSCL
4.7K
RSDA
4.7K
COUT
100 nF
TP1
HDMI
1 D2+
2 GND
3 D2−
4 D1+
5 GND
6 D1−
7 D0+
8 GND
9 D0−
10 CK+
11 GND
12 CK−
13 CEC
14 N/C
15 SCL
16 SDA
17 DDC GND
18 +5V
19 HOTPLUG
LV DOMAIN
“IN” TO ASIC
5V DOMAIN
“OUT” TO CABLE
Figure 4. Design Example
http://onsemi.com
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