Robust, High Res Capacitive Touch & Proximity Sensing User Interface (UI) w/LED Lighting Ref Design (TIDA-00474)
Capacitive sensing based touch button implementation is commonly used, for the user interfaces in home appliances. Solutions based on low measurement resolution, suffer from achieving reliable operation and faster user response. The TI design TIDA-00474 hardware platform demonstrates the mitigation of these challenges using EMI-resistant, high-resolution (up to 28 bits), high-speed capacitance-to-digital converters. The board is designed and tested in cooker hood environment. Implementation details and test results are provided for capacitive button sensing and long range proximity sensing (up to 30cm).
2 channels of high resolution (28bits) proximity sensing, providing tested hardware platform for the implementation of gesture recognition 6 capacitive touch keys implementation for robust touch detection against moisture and other disturbances EMI resistance architecture on each capacitive sensing channel to protect the detection against common noise sources Proximity sensing implementation and test results with copper on PCB and ITO (indium tin oxide) based implementations Low power consumption during standby. Less than 1mA current consumption on DC power supply during standby Highly integrated LED driver circuit on board with digital dimming, over current protection, over temperature protection and adjustable under voltage-lock-out functions Provision for temperature sensing and humidity sensing Fully tested for cooker hood equipment
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