{"product_id":"sparkfun-mikroe-ldc-touch-click","title":"SparkFun MIKROE LDC Touch Click","description":"\u003cp\u003eLDC Touch Click is a compact add-on board optimized for inductive touch applications. This board features the LDC3114-Q1, a four-channel inductance-to-digital converter for low-power proximity and touch-button sensing from Texas Instruments. It comes with an adjustable sensitivity per input channel and operational power mode selection and measures frequency shifts caused by micro-deflection in the conductive targets formed by button presses. These presses are reported through a compatible I2C interface beside four LED indicators for its visual indication. This Click board� enables touch button design for human-machine interface and precise linear position sensing of metal targets for automotive, consumer, and industrial applications by allowing access to the raw data representing the inductance value.\u003c\/p\u003e \u003cp\u003eLDC Touch Click as its foundation uses the LDC3114-Q1, a hybrid multichannel, high-resolution inductance-to-digital converter from Texas Instruments. This inductive sensing device enables touch button design for a human-machine interface (HMI) by measuring small deflections of conductive targets using a coil implemented on a printed circuit board. Button presses form micro-deflection in the conductive targets, which cause frequency shifts in the resonant sensors, and measures such frequency shifts determining when button press occurs. With adjustable sensitivity per input channel, the LDC3114-Q1 can reliably operate with a wide range of physical button structures and materials.\u003c\/p\u003e \u003cp\u003eThe LDC3114-Q1 offers two main modes of operations: raw data access mode and button algorithm mode, which is controlled by register settings. The button mode can automatically correct any deformation in the conductive targets and offers well-matched channels allowing for differential and ratiometric measurements, which enable compensation of environmental and aging conditions such as temperature and mechanical drift. On the other hand, it also implements a raw data access mode, where MCU can read directly the data representing the effective inductance of the sensor and implement further post-processing.\u003c\/p\u003e \u003cp\u003eThis Click board� communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings, supporting a Fast Mode operation up to 400kHz. Also, the LDC3114-Q1 requires a voltage of 1.8V for its power supply to work correctly. Therefore, a small regulating LDO, the TLV700, provides a 1.8V out of 3V3 mikroBUS� power rail.\u003c\/p\u003e \u003cp\u003eAs mentioned earlier, this board contains four touch buttons, representing the only elements on the upper-top side of the board. Each of these buttons has its own LED indicator representing the activity in that field. If a touch event is detected on one of these onboard pads, the state of the corresponding LED will be changed, indicating an activated channel; more precisely, touch has been detected on that specific field.\u003c\/p\u003e \u003cp\u003eAlongside LED indicators, data from these channels can be processed via the MCU through four pins labeled from S0 to S3, routed to the AN, RST, CS, and PWM pin of the mikroBUS� socket, respectively. Besides, there is an additional interrupt signal routed on the INT pin of the mikroBUS� socket indicating when a specific interrupt event occurs (touch detection, available new data, and such), alongside two power modes of operation. A Normal Power Mode for active sampling at 10, 20, 40, or 80SPS, and a Low Power Mode for reduced current consumption at 0.625, 1.25, 2.5, or 5SPS selectable through an onboard switch labeled as MODE SEL.\u003c\/p\u003e \u003cp\u003eThis Click board� can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board� comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eInterface: I\u003csup\u003e2\u003c\/sup\u003eC\u003c\/li\u003e \u003cli\u003eCompatibility: mikroBUS�\u003c\/li\u003e \u003cli\u003eDimensions: 57.15 x 25.4mm\u003c\/li\u003e \u003cli\u003eInput Voltage: 3.3V\u003c\/li\u003e \u003cli\u003eResonant Frequency: Min. 5 MHz, Max. 30 MHz\u003c\/li\u003e \u003cli\u003eSampling Rate: Min. 0.625 SPS, Max. 160 SPS\u003c\/li\u003e \u003cli\u003eOperating Temperature Range: Min. -40°C, Typ. +25°C, Max. +120°C\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eDocuments:\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\u003ca href=\"https:\/\/cdn.sparkfun.com\/assets\/1\/1\/8\/2\/c\/Schematic-20627-MIKROE_LDC_Touch_Click.PDF\"\u003eSchematic\u003c\/a\u003e\u003c\/li\u003e \u003cli\u003e\u003ca href=\"https:\/\/cdn.sparkfun.com\/assets\/5\/2\/6\/a\/6\/LDC3114-Q1_datasheet.pdf\"\u003eLDC3114-Q1 Datasheet\u003c\/a\u003e\u003c\/li\u003e \u003cli\u003e\u003ca href=\"https:\/\/cdn.sparkfun.com\/assets\/8\/b\/5\/6\/a\/TLV700_datasheet.pdf\"\u003eTLV700 Datasheet\u003c\/a\u003e\u003c\/li\u003e \u003cli\u003e\u003ca href=\"https:\/\/www.mikroe.com\/mikrosdk\"\u003emikroSDK\u003c\/a\u003e\u003c\/li\u003e \u003cli\u003e\u003ca href=\"https:\/\/libstock.mikroe.com\/projects\/view\/4987\/ldc-touch-click\"\u003eLibStock\u003c\/a\u003e\u003c\/li\u003e \u003c\/ul\u003e","brand":"sparkfun-10","offers":[{"title":"Default Title","offer_id":40531155910741,"sku":"20627:SEN-20627:spark","price":3375.0,"currency_code":"INR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1034\/1611\/products\/20627_-_MIKROE_LDC_Touch_Click_2.jpg?v=1678246754","url":"https:\/\/www.tanotis.com\/products\/sparkfun-mikroe-ldc-touch-click","provider":"Tanotis","version":"1.0","type":"link"}