Wearable technology combined with physiological sensors is a product such as a smart watch that appears on the market today. The next generation of detection devices will be worn on the body and monitor real-time data, such as blood sugar levels, so that the device can collect more data in a single day. This method was originally used on wristbands, and now the wristband has been able to measure the distance and pulse of a person walking. It has evolved to use inconspicuous underwear to collect key data such as pulse, breathing rate, posture, and even distance during exercise.
Although these monitoring data are already very useful, there may be more breakthroughs in the future. If people with diabetes can no longer prick their fingers a few times a day to measure blood sugar, to adjust the dose of insulin used, but better ways to collect these important data more easily and more frequently. Using infrared laser light sources and a photoacoustic spectroscopy, German researchers have developed methods for measuring blood glucose levels without penetrating the skin. This approach is a revolution in non-invasive diagnostic monitoring and treatment of diabetes.
However, the fit of these wearable devices is also a potential weakness. Because these devices directly face the static electricity generated by the user, and the device is inoperable because of improper protection. In fact, simple human contact can lead to transient electrostatic discharge (ESD), based on which ESD can enter the device through any sensor circuit, button, battery charging interface or data I/O interface.
Semiconductor manufacturers are continually striving to improve the ESD protection of components to improve the capabilities of devices. For example, the most sensitive circuits can be protected with low clamping voltages: during electrostatic discharge, the main job of ESD protection is to reduce the on-state. Or an increase in dynamic resistance, which in turn can divert and reduce the possibility of as many ESD current transients as possible. The principle of this electrostatic discharge protection method is to remove more inrush current by reducing the dynamic resistance, which can reduce the electrical stress on the integrated circuit and ensure the circuit is intact.
Low capacitance avoids interference from high-speed data transmission. While the protection circuit is the key to ESD protection devices, it is also important to play a role that does not always interfere with the operation of the circuit. For example, on a radio interface (Bluetooth, zigbee, etc.) or a wired port, such as USB 2.0, electrostatic protection must avoid distortion or loss of signal in the circuit. To ensure signal integrity, the electrostatic capacitance of the ESD protection circuit is minimized without compromising protection.
Smaller devices are needed in wearable devices to accommodate limited board space, which will make wearable medical devices progressively thinner and smaller (watches, bracelets, chest straps) or directly incorporated into clothing Medium, so that the board will have a smaller space for ESD protection solutions.
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