Hello everyone, I am the Intelligence Guy~
First of all,Electrostatic Discharge (ESD),is the phenomenon of charge transfer that occurs when objects with different static electric potentials come close to or directly contact each other.ESD testing isa type of reliability testing for electronic products, measuring the product/system’s resistance to ESD interference.
ESD can cause your embedded electronic productsto malfunction due to the electric/magnetic field changes caused by discharge; in the worst-case scenario,it can damage semiconductor devices through energy exchange, leading to direct product damage.
“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 static charge accumulation and discharge hazards. 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 the grounding loop, preventing charge from accumulating and forming a high potential difference — which is the core trigger of ESD (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 discharge).2. Reduce ESD damage/malfunction to devicesIf the device is grounded, when encountering ESD (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 impact; at the same time, grounding can stabilize the electric/magnetic field around the device, reducing the risk of device malfunction caused by electromagnetic field changes due to discharge (such as instrument freezing, data corruption).3. Ensure the accuracy of ESD testingFor some ESD testing environment setups (such as grounding planes, coupling board grounding),the essence is to simulate the charge discharge path in real usage scenarios through “unified grounding” — if the device is not grounded during testing, it may not only cause abnormal test voltage due to charge accumulation (such as voltage doubling) but also lead to test results deviating 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 beingavoiding charge accumulation + limiting discharge energy:
1. Residual charges must be released before each ESD test
“Ungrounded devices cannot discharge themselves. If residual charges are not eliminated before the next discharge, the charge will accumulate, causing the voltage to reach twice the expected value, which may damage 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 accumulation.2. Strengthen insulation and electrostatic shielding during actual useUngrounded 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 trying to use them in low-static environments (such as avoiding prolonged exposure in frequently rubbed scenarios during dry autumn and winter).Finally, I recommend checking out TI’s video for learning reference: Followed Follow Replay Share Like Watch moreEmbedded Intelligence Bureau
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Avoid Pitfalls: ESD Testing is Essential for Embedded Electronic Product Development~
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