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FDC2114RGHR Datasheet(PDF) 11 Page - Texas Instruments |
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FDC2114RGHR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 60 page IN0A IN0B IN1A IN1B FDC2112 / FDC2212 VDD GND SCL SDA Int. Osc. ADDR INTB SD GND MCU VDD 3.3 V 3.3 V GPIO GPIO 0.1 F 1 F Core Resonant circuit driver Resonant circuit driver I 2C I 2C peripheral 3.3 V L Cap Sensor 0 CLKIN 40 MHz C L Cap Sensor 1 C FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 9 Detailed Description 9.1 Overview The FDC2112, FDC2114, FDC2212, and FDC2214 are high-resolution, multichannel capacitance-to-digital converters for implementing capacitive sensing solutions. In contrast to traditional switched-capacitance architectures, the FDC2112, FDC2114, FDC2212, and FDC2214 employ an L-C resonator, also known as L-C tank, as a sensor. The narrow-band architecture allows unprecedented EMI immunity and greatly reduced noise floor when compared to other capacitive sensing solutions. Using this approach, a change in capacitance of the L-C tank can be observed as a shift in the resonant frequency. Using this principle, the FDC is a capacitance-to-digital converter (FDC) that measures the oscillation frequency of an LC resonator. The device outputs a digital value that is proportional to frequency. This frequency measurement can be converted to an equivalent capacitance 9.2 Functional Block Diagrams Figure 10. Block Diagram for the FDC2112 and FDC2212 Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 |
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