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HDMI® IPAD™ product presentation
HDMI signal conditioning
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Overview
Basic
In depth
2
High-definition multimedia interface (HDMI)
Ecosystem
HDMI connectors address many applications
3
HDMI connector
ESD protection requirements
HDMI connector


High frequency
Differential signaling
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19 17 15 13 11 9
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5
4
3
2
1
Datalines
Control lines


Low frequency
I²C bus must drive poor-quality cables
Power supply


5 V DC
Requires current limiter
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HDMI connector
ESD protection is needed for…
Advanced technology with very thin lithography
and gate oxide highly vulnerable to ESD
Integrated electronics systems with PCBs
having a high component density facilitate
ESD coupling and propagation
Core ICs such as microcontrollers,
micro-processors, transceivers, etc.
IC manufacturers reluctant to make robust
embedded ESD protection diodes that would
require a significant active area of their
advanced and expensive technology.
When the application uses RF (Wi-Fi or Bluetooth), a common-mode filter
is required, in addition to ESD protection, to avoid RF performance decrease
due to the EMI generated by the high-speed link.
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HDMI – Dataline ESD protection
Why ultra-low capacitance ?
• The parasitic capacitance of ESD protection devices must be low enough to allow
HDMI signals to be transmitted without degradation.
• A high parasitic capacitance of the ESD protection devices would increase too much
the signal rise/fall time and prevent the communication.
Example of the impact of parasitic capacitance on an HDMI signal simulated with discrete capacitance
Time domain
Fall time
too HIGH
Frequency domain
Bandwidth is too narrow
Rise time
too HIGH
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HDMI – Control lines:
Why a specific I²C driver?
• The parasitic capacitance of poor quality or long cables increases the rise time of the
I²C bus used by the High-bandwidth Digital Content Protection (HDCP) protocol.
• If this rise time exceeds the HDMI specification, a blue screen prevents the user from
watching their video content.
• To mitigate this issue, an optimized I²C timing booster is needed.
Without optimized I²C booster
Rise time > 1200 ns
High risk of interoperability issue
With ST's optimized I²C booster
Rise time < 400 ns
I²C timing compliant
with
HDMI
rise time
< 400
ns
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HDMI – Power supply
• The 5 V pin of the HDMI connector provides power to devices connected to the HDMI
source.
• The HDMI specification allows:
• Up to 500 mA of maximum output current from the source
• Up to 55 mA of maximum sunk current
HDMI
connector
• Up to 100 mV of maximum voltage drop-out
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3
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5
7
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FAULT
UVLO
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or
RPU_FAULT
OTP
decoupling
capacitance
decoupling
capacitance
HDMI
ASIC
+5V_OUT
VDD_5V
VDD_IC
1
5V
IC
rise time < 400 ns
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HDMI placement and layout - Tips
High-speed data


Needs ESD protection close to HDMI connector
Routing is impedance-controlled
Interface IC

Single-chip interface is
recommended for easier layout
HDMI chipset


Cannot integrate system-level ESD protection (+8000 V) as per IEC 61000-4-2 Level 4  it requires an interface IC
with system-level ESD protection
Compliant with the basic HDMI specification, it will not handle optimized I²C booster
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ST’s HDMI product line-up
Data lines
TMDS ESD
protection
CONTROL LINES
ESD
protection
I²C
booster
HPD
signal
conditioning
S
o
u
r
c
e
HDMI2C1-14HDS
S n
i k
HDMI2C2-14HD
CEC handling
level
shifter
HEAC
signal
+5 V
current
limiter
HDMI2C1-14HD
HDMI2C1-6C1
HDMI2C1-14HD
& HDMI2C2-14HD
QFN 36L
500-µm pitch
6.5 x 3.5 mm
HDMI2C1-14HDS
QFN 24L
500-µm pitch
4 x 4 mm
HDMI2C1-6C1
QFN 18L
500-µm pitch
3.5 x 3.5 mm
5 V & I²C
backdrive
protection
ENABLE
signal
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ST solution for HDMI interfaces w/ RF
HDMI application with RF
Requires ESD integrated common-mode filter on datalines with ST’s ECMF series
11
ST solution for HDMI interfaces w/o RF
HDMI application without RF
Requires single-chip HDMI interface IC such as HDMI2Cx-14HDx
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Let’s go further
Basic presentation
Intermediate product presentation soon available:
‘Understanding HDMI IPAD™ series specification’
Datasheets:
In-depth information

HDMI2C1-14HD: ESD protection & signal conditioning for HDMI 2.0 source interface

HDMI2C2-14HD: ESD protection & signal booster for HDMI™ 2.0 sink interface

HDMI2C1-6C1: ESD protection and signal booster for HDMI™ Source control stage interface
Application Notes:
Selection
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
TVS short-pulse dynamic resistance measurement ... (AN4022)

IEC 61000-4-2 standard testing (AN3353)
 Selection guide [pdf]
 www.st.com/hdmi-ipad
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