CM2020-00TR_11 Datasheet, PDF (8/9 Pages) ON Semiconductor – HDMI Transmitter Port Protection and Interface Device

CM2020−00TR
APPLICATION INFORMATION (Cont’d)
Design Considerations
ESD Bypass
Pin 37 (ESD_BYP) is provided for an optional external ESD bypass capacitor only (i.e. 0.1 mF ceramic). It should not be
connected to any supply rail.
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
RPU _47K
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
GND 28
12 D0−
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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