Setup
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SLVUBE1A – February 2018 – Revised April 2018
Copyright © 2018, Texas Instruments Incorporated
ESD224 Evaluation Module User's Guide
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Set the scope attenuation factor to 40X.
•
Set the oscilloscope to trigger on a positive edge for (+) ESD and a negative edge for (–) ESD
strikes. The magnitude should be set to 20 V.
•
Following IEC 61000-4-2, strike contact ESD to TP1.
Recommended settings for the time axis is 20 ns/div and for the voltage axis is 10 V division.
The voltage levels of the ESD applied to TP1 should not /– 8 kV when capturing clamping
waveforms.
If the clamping waveform for channel two is desired, follow the same procedure except connecting the
oscilloscope to J6 and striking TP3.
For best performance of this test, connect the IC, that the ESD224 is suppose to be protecting, to TP2 or
TP4 and then strike and see the waveform. This will show the clamping waveform when another device is
connected because the ESD224 limits the current seen by this IC during an ESD event.
3.2.1.3
Evaluation of Test Results
After ESD testing, perform normal operation testing to see if device has broken or not.
3.3
U3 and U4 - HDMI
At the top of the EVM there are two HDMI connectors, a male and a female. Two ESD224's (U3 and U4)
are placed between those connectors, on the TMDS data and TMDS clock lines, to provide ESD
protection for any devices connected downstream of the board. This board can be connected into a
system to pass HDMI 2.0 content, from an HDMI source to a display for example, in order to verify HDMI
2.0 compliance. However, due to the losses from the male and the female HDMI connectors, it is not
recommended to use this EVM board to run the standard HDMI 2.0 compliance tests. This EVM board is
intended for functional and ESD testing only. For running HDMI 2.0 compliance tests, it is recommended
to place ESD224s directly on the system board built specifically for such a purpose. Please note that this
EVM board was attached to the TPD158RGZEVM to run HDMI 2.0 compliance tests and the results
confirmed the HDMI 2.0 compliance with margin.
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Board Layout
This section provides the ESD224EVM board layout. ESD224EVM is a 2-layer board of FR-408HR at
0.062” thickness. Layers 2, 3, and 4 are simple ground planes and not shown here.
