Texas Instruments TPD2E2U06-Q1EVM, User Manual

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SETUP
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3.3.2 Evaluation of Test Results
Connect the tested device on the EVM to a curve tracer both before and after ESD testing. After each
incremental level, if the IV curve of the ESD protection diode shifts ±0.1V, or leakage current increases by
a factor of ten, then the device is permanently damaged by ESD.
3.4 U6
A TPD2E2U06-Q1 (U6) also has an SMB (J7) connector for capturing clamping waveforms with an
oscilloscope during an ESD strike. Caution must be taken when capturing clamping waveforms during an
ESD event so as not to damage the oscilloscope.
3.4.1 Oscilloscope setup
Without a proper procedure, capturing ESD clamping waveforms exposes the oscilloscope to potential
voltages higher than the rating of the equipment. Proper methodology can mitigate any risk in this
operation.
Recommended equipment:
• Minimum of 1GHz bandwidth oscilloscope.
• Either of the following:
– 2 10X 50 Ω attenuators and a 0 Ω resistor (to be installed at R1).
– 1 10X 50 Ω attenuator and a 150 Ω resistor (already installed at R1).
• 50
Ω
shielded SMB cable.
Procedure
In order to protect the oscilloscope, attenuation of the measured signal is required. Here are two possible
procedures for testing U6:
1. Using two 10X attenuators:
• Install a 0
Ω
resistor in R1.
• Attach two 10X attenuators to the oscilloscope channel being used.
• Attach the 50 Ω shielded SMB cable between J7 and the attenuator.
• Set the scope attenuation factor to 100X.
• 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 Section 3.3.1 , strike contact ESD to TP8.
2. Using one 10X attenuator:
• Attach one 10X attenuator to the oscilloscope.
• Attach the 50 Ω shielded SMB cable between J7 and the attenuator.
• 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 Section 3.3.1 , strike contact ESD to TP8.
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 TP8 should not exceed ± 8 kV while capturing clamping
waveforms.
4 TPD2E2U06-Q1EVM SLVUAC6 – December 2014
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