Hello everyone, I am the Intelligence Guy~
First of all, Electrostatic Discharge (ESD) refers to the phenomenon of charge transfer that occurs when objects with different static electric potentials come close to or directly contact each other. ESD testing is a type of reliability testing for electronic products, measuring the product/system’s resistance to interference from electrostatic discharge.
Even minor electrostatic discharges can cause your embedded electronic products to experience changes in the electric/magnetic fields generated by the discharge, leading to device malfunctions; in the worst-case scenario, energy exchange can damage semiconductor devices, resulting in direct product failure.
“Grounding can significantly reduce ESD risks; ungrounded devices require additional protective measures.”
The essence of grounding is to provide a “safe discharge path” for charges, which can fundamentally reduce the accumulation of static electricity and the hazards of discharge. Especially in ESD testing and the actual application of electronic products, the role of grounding is mainly reflected in the following aspects:
1. Avoid charge accumulation and reduce discharge risks.
Grounded devices can discharge any accidentally accumulated static charges (such as those generated by friction) to the ground in real-time through a grounding loop, preventing the charge from accumulating to a high potential difference — which is the core cause of electrostatic discharge (for example, when a person touches the device, if the device is grounded, even if the person is charged, the charge will quickly discharge through the device’s grounding loop, preventing violent discharges).2. Reduce ESD damage/malfunctions to devices.If the device is grounded, when it encounters electrostatic discharge (such as contact discharge or air discharge during testing), the instantaneous large current generated by the discharge can be directly discharged through the grounding loop, rather than flowing through the internal semiconductor devices (such as chips, capacitors), effectively avoiding damage to the devices due to energy shocks; at the same time, grounding can stabilize the electric/magnetic fields around the device, reducing malfunctions caused by electromagnetic field changes due to discharges (such as instrument crashes, data corruption).3. Ensure the accuracy of ESD testing.For some ESD testing environments (such as grounding planes, coupling board grounding), the essence is to simulate the charge discharge paths in real usage scenarios through “unified grounding” — if the device is not grounded during testing, it may lead to abnormal test voltages (such as voltage doubling) due to charge accumulation, and the test results may deviate from actual usage conditions, making it impossible to accurately assess the device’s ESD resistance.Of course, not grounding is not impossible, but it requires “additional protection.”
Some devices cannot be grounded due to functional requirements or usage scenario limitations (such as portable battery-powered devices, outdoor devices without grounding conditions). In this case, it is not that they “absolutely cannot be used,” but targeted measures must be taken to offset the risks of “not being grounded,” with the core being to avoid charge accumulation + limit discharge energy:
1. Residual charges must be released before each ESD test.
“Ungrounded devices cannot discharge on their own; if residual charges are not eliminated before the next discharge, the charge can accumulate, causing the voltage to reach twice the expected value, potentially damaging the device.” Therefore, for ungrounded devices in ESD testing, it is necessary to release the residual charges on the device’s surface before applying each discharge pulse using specialized discharge tools (such as grounding wrist straps, discharge rods) to avoid voltage buildup.2. Strengthen insulation and electrostatic shielding during actual use.Ungrounded devices must reduce static contact through “physical isolation” during daily use: for example, using high-insulation materials for the casing (to avoid direct contact discharge with the human body/other charged objects), adding electrostatic shielding layers to key internal components (such as chips) to block electromagnetic interference from external discharges, and using them in low-static environments as much as possible (such as avoiding prolonged exposure in frequently rubbed scenarios during dry autumn and winter seasons).Finally, I recommend everyone check out TI’s video for learning reference: Follow Replay Share Like <!– –> Watch MoreEmbedded Microprocessors
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Avoid Pitfalls: ESD Testing is Essential for Embedded Electronic Product Development~
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Author:Mr. Deng
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