FDC2114RGHT datasheet(11/61 Pages) TI1

11 / 61 page

IN0A

IN0B

IN1A

IN1B

FDC2112 / FDC2212

VDD

GND

SCL

SDA

Int. Osc.

ADDR

INTB

GND

MCU

VDD

3.3 V

GPIO

0.1 F 1 F

Core

Resonant

circuit driver

Resonant

circuit driver

peripheral

3.3 V

Cap

Sensor 0

CLKIN

40 MHz

Cap

Sensor 1

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

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Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114

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