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


  • 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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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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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
* Data sheet 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. B) Jun. 22, 2021
Application note Simulate Inductive Sensors Using FEMM (Finite Element Method Magnetics) (Rev. A) Jun. 16, 2021
Technical article Accurate frost or ice detection based on capacitive sensing Mar. 01, 2018
Application note Quantifying Ice and Frost Buildup Using Capacitive Sensors Nov. 30, 2017
Application note Capacitive Proximity Sensing Using FDC2x1y (Rev. A) Oct. 20, 2017
Technical article Comparing capacitive and ultrasonic kick-to-open sensing Sep. 06, 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
Technical article How to remove the ground-shift phenomenon from your capacitive-sensing application May 09, 2016
Technical article Engineers do better than magicians: HMI touch through a thick glass Apr. 26, 2016
Application note Power Consumption Analysis for Low Power Capacitive Sensing Applications Jan. 18, 2016
User guide FDC2214 Proximity and Capacitive Touch EVM User’s Guide Oct. 14, 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

Design & development

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

Hardware development

document-generic User guide

The FDC2214 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 FDC2214. An MSP430 microcontroller is used to interface (...)

  • Multiple board perforations: provide maximum evaluation and system design flexibility
  • Includes two sample PCB capacitive sensors for two of the four channels
  • Accompnaying GUI for quick concept demonstration and data capture
  • EVM does not require additional components for operation
document-generic User guide

The FDC2214PROXSEN-EVM demonstrates capacitive proximity and touch button sensing with the use of TI's FDC221x capacitive sensing technology. The evaluation module is a complete hardware and firmware solution that integrates the 4-channel FDC2214, MSP430FR5969 and TPS61029 into one design. The (...)

  • Demonstrates proximity and cap touch capabilities
  • Adaptive processing algorithm integrated in the firmware
  • JTAG connection available for debugging
  • Battery operated from one AA-battery (not included)
  • Firmware included

Software development

SNOC033A.ZIP (38 KB)

Design tools & simulation

SLAM255.ZIP (26 KB) - IBIS Model

Reference designs

High Temperature Touch through Glass Reference Design
TIDA-00464 Human machine interface (HMI) is an essential part of process plants since it is one of the major ways through which humans and machines interact.  This reference design offers an HMI solution for harsh and hazardous area applications. In process plants, operators need to interact with an (...)
document-generic Schematic
Capacitive Frost or Ice Detection Reference Design, Resolution of <1mm, Temperature Drift <0.25%
TIDA-01465 — Frost and ice buildup on cooling bodies and evaporators can significantly decrease system energy efficiency in many appliance applications such as refrigerators, air conditioners, and freezers. This sensor reference design helps to achieve the more stringent energy efficiency requirements of (...)
document-generic Schematic
Noise-immune Capacitive Proximity Sensor System Reference Design
TIDA-00466 The FDC2214 proximity and capacitive sensing design demonstrates the use of TI's capacitive sensing technology to sense and detect the presence of various objects. The design is a complete hardware and firmware solution. The firmware  processes the data from one proximity sensor and two (...)
document-generic Schematic

CAD/CAE symbols

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WQFN (RGH) 16 View options

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