From the 16th Hi-Tech Fair, where attention has not subsided, it is not difficult to see that wearable devices have attracted the attention of many investors, and the other side that has attracted much attention is the challenges that wearable devices will face. Therefore, ESD protection devices have also received attention from manufacturers, and manufacturers will continue to develop protection technologies that will not interfere with the core functions of wearable devices.
The consumer wears directly through contact with the skin, and the great exposure risk is static electricity generated by the user. Static electricity can be said to be ubiquitous, and even the simplest human contact can generate short-lived electrostatic discharge (ESD). Without proper protection, no sensor circuitry, batteries, charging interfaces, buttons, or data inputs and outputs can provide ESD with access to the wearable device, causing irreparable damage to the electronics.
First, a lower capacitance to avoid interference with high-speed data transmission. ESD protection devices must provide circuit protection that does not interfere with everyday functions. For example, on a radio interface (such as Bluetooth or WLAN) or a wired port like USB 2.0, the ESD protector does not cause signal distortion or loss of data signal strength. To ensure signal integrity, the capacitance of the ESD protector must be minimized without compromising the level of protection.
Second, use the lower clamping voltage to protect the most sensitive circuit. If an ESD discharge event occurs, the main job of the ESD protector is to transfer and dissipate the ESD transient voltage as much as possible. This feature is improved by reducing the state resistance or dynamic resistance when the electrostatic pulse is applied, and the ESD protector carries more inrush current than the protected circuit. By doing so, it reduces the electrostatic discharge pressure on the integrated circuit and ensures its survival.
Third, the smaller size to accommodate the available space of the limited board in the wearable device. Regardless of how high performance the protection device operates, it is not useful if it does not adapt to the specific application environment. Wearables become thinner and smaller, and boards have minimal space available to accommodate ESD protection. Separation device protection schemes are the best way to address this potential design challenge because they give design engineers the flexibility of a special board layout.
In the current market, the variety of wearable devices and the high acceptance of wearable devices make wearable technology popular. Wearables will continue to challenge designers, and designers must ensure that they are working as expected, regardless of the user's level of activity, or how they are affected by ESD transients. ESD protection device manufacturers will continue to develop protection technologies that will not interfere with the core functions of wearable devices—helping wearable device manufacturers deliver reliability and value to consumers.
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