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FDC2212QDNTTQ1 Datasheet(PDF) 10 Page - Texas Instruments |
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FDC2212QDNTTQ1 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 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 Copyright © 2016, Texas Instruments Incorporated 10 FDC2112-Q1, FDC2114-Q1, FDC2212-Q1, FDC2214-Q1 SNOSCZ9 – MAY 2016 www.ti.com Product Folder Links: FDC2112-Q1 FDC2114-Q1 FDC2212-Q1 FDC2214-Q1 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated 7 Detailed Description 7.1 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 7.2 Functional Block Diagrams Figure 10. Block Diagram for the FDC2112 and FDC2212 |
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