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LDC2112PWT Datasheet(PDF) 10 Page - Texas Instruments |
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LDC2112PWT Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 49 page  Inductive Sensing Core IN0 Logic GND SCL SDA I 2C LPWRB IN1 COM LDC2112 Digital Algorithm INTB VDD Resonant Circuit Driver OUT0 OUT1 ADDR Copyright © 2016, Texas Instruments Incorporated 10 LDC2112, LDC2114 SNOSD15 – DECEMBER 2016 www.ti.com Product Folder Links: LDC2112 LDC2114 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The LDC2112/LDC2114 is a multi-channel, low-noise, high-resolution inductance-to-digital converter (LDC) optimized for inductive touch applications constructed of monolithic surfaces. Button presses form surface micro- deflections which cause frequency shifts in the resonant sensors. The LDC2112/LDC2114 can measure such frequency shifts and determines when button presses have occurred. With adjustable sensitivity per input channel, the LDC2112/LDC2114 can reliably operate with a wide range of physical button structures and materials. The high resolution measurement enables the implementation of multi-level buttons. The LDC2112/LDC2114 incorporates customizable post-processing algorithms for enhanced robustness. The LDC2112/LDC2114 can operate in an ultra-low power mode for optimal battery life, or can be toggled into a higher scan rate for more responsive button press detection for game play or other low latency applications. The LDC2112/LDC2114 is operational from –40 °C to +85 °C with a 1.8 V ± 5% power supply voltage. The LDC2112/LDC2114 is configured through 400 kHz I2C. Button presses can be reported through the I2C interface or with configurable polarity dedicated push-pull outputs. The only external components necessary for operation are supply bypassing capacitors and a COM pin capacitor to ground. 7.2 Functional Block Diagram Figure 9. Block Diagram of LDC2112 |
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