App note: Buried capacitive sensors for tamper protection

A short app note from Silicon Labs on burying pads to prevent snopping on keypads. Link here (PDF) An individual’s financial matters are increasingly electronic in nature and decreasingly interpersonal. As financial institutions replace human interaction with electronic interfaces such as ATMs, the need to make electronic circuits tamper-proof becomes critical. A typical numeric keypad […]

App note: Techniques for robust touch sensing design

Here’s an app note from Microchip describing the best design practices when developing capacitive touch applications in noisy environments: This application note will begin by defining the problems caused by noise, and explain how that noise typically affects systems. Hardware guidelines will then be provided to help maximize the natural signal-to-noise ratio (SNR) of the application. […]