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Parameters

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Package | Pins | Size

WQFN (RGH) 16 16 mm² 4 x 4 open-in-new Find other Signal conditioners

Features

  • EMI-Resistant Architecture
  • Maximum Output Rates (one active channel):
    • 13.3 ksps (FDC2112, FDC2114)
    • 4.08 ksps (FDC2212, FDC2214)
  • Maximum Input Capacitance: 250 nF (at 10 kHz
    with 1 mH inductor)
  • Sensor Excitation Frequency: 10 kHz to 10 MHz
  • Number of channels: 2, 4
  • Resolution: up to 28 bits
  • System Noise Floor: 0.3 fF at 100 sps
  • Supply Voltage: 2.7 V to 3.6 V
  • Power Consumption: Active: 2.1 mA
  • Low-Power Sleep Mode: 35 µA
  • Shutdown: 200 nA
  • Interface: I2C
  • Temperature range: –40°C to +125°C
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Description

Capacitive sensing is a low-power, low-cost, high-resolution contactless sensing technique that can be applied to a variety of applications ranging from proximity detection and gesture recognition to remote liquid level sensing. The sensor in a capacitive sensing system is any metal or conductor, allowing for low cost and highly flexible system design.

The main challenge limiting sensitivity in capacitive sensing applications is noise susceptibility of the sensors. With the FDC2x1x innovative EMI resistant architecture, performance can be maintained even in presence of high-noise environments.

The FDC2x1x is a multi-channel family of noise- and EMI-resistant, high-resolution, high-speed capacitance-to-digital converters for implementing capacitive sensing solutions. The devices employ an innovative narrow-band based architecture to offer high rejection of noise and interferers while providing high resolution at high speed. The devices support a wide excitation frequency range, offering flexibility in system design. A wide frequency range is especially useful for reliable sensing of conductive liquids such as detergent, soap, and ink.

The FDC221x is optimized for high resolution, up to 28 bits, while the FDC211x offers fast sample rate, up to 13.3ksps, for easy implementation of applications that use fast moving targets. The very large maximum input capacitance of 250 nF allows for the use of remote sensors, as well as for tracking environmental changes over time, temperature and humidity.

The FDC2x1x family targets proximity sensing and liquid level sensing applications for any type of liquids. For non-conductive liquid level sensing applications in the presence of interferences such as human hands, the FDC1004 is recommended, which has integrated active shield drivers.

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Similar but not functionally equivalent to the compared device:
FDC1004 ACTIVE 4-Ch, 16-bit, capacitance to digital converter with active shield driver This device is a 4-channel, high resolution FDC with integrated active shield drivers

Technical documentation

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Type Title Date
* Datasheet FDC2x1x EMI-Resistant 28-Bit,12-Bit Capacitance-to-Digital Converter for Proximity and Level Sensing Applications datasheet (Rev. A) Jun. 25, 2015
Application note Common Inductive and Capacitive Sensing Applications (Rev. A) Mar. 30, 2020
Application note Simulate Inductive Sensors Using FEMM (Finite Element Method Magnetics) Mar. 25, 2020
Application note Capacitive Proximity Sensing Using FDC2x1y (Rev. A) Oct. 20, 2017
User guide FDC2114 and FDC2214 EVM User’s Guide (Rev. A) Sep. 14, 2016
Application note Ground Shifting in Capacitive Sensing Applications May 27, 2016
Application note Power Consumption Analysis for Low Power Capacitive Sensing Applications Jan. 18, 2016
Technical articles Capacitive sensing: simple algorithm for proximity sensing Nov. 23, 2015
Technical articles Capacitive sensing: which architecture should you choose? Oct. 20, 2015
Application note Derivative Integration Algorithm for Proximity Sensing Sep. 29, 2015
Application note Capacitive Sensing: Direct vs Remote Liquid Level Sensing Performance Analysis (Rev. A) Jul. 24, 2015
Technical articles Get Connected: A new blog series Jan. 10, 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
349
Description
The FDC2114 evaluation module demonstrates capacitive sensing technology to detect the presence of a conductive or non-conductive target. The evaluation module includes two PCB capacitive sensors that connect to two of the four channels of the FDC2114. An MSP430 microcontroller is used to interface (...)
Features
  • Multiple board perforations provide maximum evaluation and system design flexibility
  • Includes two sample PCB capacitive sensors for two of the four channels
  • Accompanying GUI for quick concept demonstration and data capture
  • EVM does not require additional components for operation, enabling rapid device (...)

Software development

SUPPORT SOFTWARE Download
SNOC033A.ZIP (38 KB)

Design tools & simulation

SIMULATION MODEL Download
SLAM265.ZIP (26 KB) - IBIS Model

CAD/CAE symbols

Package Pins Download
WQFN (RGH) 16 View options

Ordering & quality

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  • Ongoing reliability monitoring

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