While smartphones, TWS, and other mobile devices are becoming smaller and more sophisticated, devices and ICs are becoming more vulnerable to electrostatic discharge (ESD), surges, and other types of immunity. These mobile devices are increasingly being hand-held, operated, and worn. Therefore, ESD countermeasures are needed more than ever, while ESD protection components are also increasingly being used to prevent ESD. TDK offers a lineup of chip varistors as components that can protect circuits from ESD. Lastly, using actual devices, this article presents examples of ESD countermeasures using chip varistors for actual failures that occur when ESD enters a device.
Stray-field compensation by TMR sensor
Degradation of accuracy due to stray-field noise is a common problem for magnetic field sensors. Securing a distance between the source of stray field and the sensor, or placing a magnetic shield, are major restrictions on design and lead to higher system costs. In addition, it was difficult to select an appropriate design while adjusting the balance between compensation effectiveness and cost.
In this article, we will introduce TDK’s method of suppressing magnetic stray-fields using multiple sensors as a solution.