Proximity Switch With CapTIvate Teach Button Reference Design
1 января 2018
This reference design demonstrates the implementation of a capacitive touch button based on TI’s CapTIvate™ technology in an ultra-small 3.5-mm width PCB which is commonly used as a set button in proximity switches. In combination with the highly integrated IO-Link PHY, a flexible output, either PNP or NPN, is realized. This SIO stage protects against reverse polarity, ESD, EFT, and surge, allowing the design to meet IEC 61000-4 standards. The Hall sensor with an analog output signal enables flexible usage by teaching the distance of the magnetic object with the capacitive teach button. The analog signal is captured by the integrated ADC of the MCU.
Capacitive Teach Button With CapTIvate Technology: Support for Metal Touch and Water Rejection Designs Self and Mutual Capacitance Electrodes Enables Increased immunity to Power Line, RF, and Other Environmental Noise Highly Integrated Output Driver: NPN, PNP, IO-Link (Optional) 3.3-V or 5.0-V LDO; 20 mA Reverse Polarity Protection ESD, EFT, and Surge Protection According to IEC 61000-4 50- to 350-mA Configurable Output Current Limit 3.5mm width PCB