4-Ch, 16-bit, automotive capacitance to digital converter with active shield driver


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VSSOP (DGS) 10 9 mm² 3 x 3 open-in-new Find other Signal conditioners


  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results
    • Device Temperature Grade 1: –40°C to 125°C
      Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C5
  • Input Range: ±15 pF
  • Measurement Resolution: 0.5 fF
  • Maximum Offset Capacitance: 100 pF
  • Programmable Output Rates: 100/200/400 S/s
  • Maximum Shield Load: 400 pF
  • Supply Voltage: 3.3 V
  • Temp Range: –40° to 125°C
  • Current Consumption:
    • Active: 750 µA
    • Standby: 29 µA
  • Interface: I2C
  • Number of Channels: 4
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Capacitive sensing with grounded capacitor sensors is a very low-power, low-cost, high-resolution contact-less sensing technique that can be applied to a variety of applications ranging from proximity sensing and gesture recognition to material analysis and 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 FDC1004Q is a high-resolution, AEC-Q100 qualified, 4-channel capacitance-to-digital converter for implementing capacitive sensing solutions. Each channel has a full scale range of ±15 pF and can handle a sensor offset capacitance of up to 100 pF, which can be either programmed internally or can be an external capacitor for tracking environmental changes over time and temperature. The large offset capacitance capability allows for the use of remote sensors.

The FDC1004Q also includes shield drivers for sensor shields, which can reduce EMI interference and help focus the sensing direction of a capacitive sensor. The small footprint of the FDC1004Q allows for use in space-constrained applications. The FDC1004Q is available in a 10-pin VSSOP package, which allows for optical inspection in production, and features an I2C interface for interfacing to an MCU.

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Technical documentation

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Type Title Date
* Datasheet FDC1004Q 4-Channel Capacitance-to-Digital Converter for Capacitive Sensing Solutions datasheet Apr. 30, 2015
Application notes Common Inductive and Capacitive Sensing Applications (Rev. A) Mar. 30, 2020
Application notes Simulate Inductive Sensors Using FEMM (Finite Element Method Magnetics) Mar. 25, 2020
Application notes How to Calibrate FDC1004 for Liquid Level Sensing Applications Oct. 24, 2016
Technical articles SigCon Architect: The keys to your high-speed design Oct. 27, 2015
Application notes Capacitive Sensing: Direct vs Remote Liquid Level Sensing Performance Analysis (Rev. A) Jul. 24, 2015
Application notes Liquid Level Sensing with the Immersive Straw Approach Jun. 19, 2015
Application notes Capacitive Proximity Sensing Using the FDC1004 (Rev. A) Apr. 26, 2015
User guides FDC1004-Q1 EVM User Guide Mar. 31, 2015
Application notes Capacitive Sensing: Ins and Outs of Active Shielding (Rev. A) Feb. 12, 2015
Technical articles Make signal conditioning easy with WEBENCH® Interface Designer Jan. 27, 2015
Application notes Capacitive Sensing: Out-of-Phase Liquid Level Technique Jan. 27, 2015
Application notes FDC1004: Basics of Capacitive Sensing and Applications Dec. 12, 2014
Technical articles Get Connected: Equalization Oct. 15, 2014
Technical articles One part for all: Multi-standard signal conditioners Mar. 07, 2014

Design & development

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Hardware development

document-generic User guide

The FDC1004Q evaluation module is used to evaluate the FDC1004-Q1, automotive 4-channel capacitive-to-digital converter. The evaluation modules features a breakable PCB composed of three sections: a USB to I²C converter based on the MSP430F5528 microcontroller, the FDC1004-Q1, and two sensor (...)

  • Multiple board perforations provide maximum evaluation and system design flexibility
  • EVM does not require additional components for operation, enabling rapid device evaluation
  • Accompanying GUI for quick concept demonstration and data capture
SNOC028F.ZIP (61513 KB)

Design tools & simulation

SNAM170.ZIP (12 KB) - IBIS Model

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