SNOA951 June 2016 LDC1312 , LDC1312-Q1 , LDC1314 , LDC1314-Q1 , LDC1612 , LDC1612-Q1 , LDC1614 , LDC1614-Q1
A key component to designing a ToM button is the user experience and how much force is required to detect a button press. Mechanical buttons typically require between 2N and 5N of force. For buttons of non-moving parts, a consumer’s natural instinct is to press with less force, typically 0.5 to 2 N. To relate the amount of applied force to the amount of metal deflection produced, it is necessary to consider metal composition, thickness, and structure of the button. In general, a larger deflection is desirable, as it provides a larger shift in inductor response and provides more flexibility for button detection threshold.