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Part Number: FDC1004
What are the differences between Capacitive Sensing Versus Capacitive Touch Solutions.
Texas Instruments provides solutions for capacitive sensing and capacitive touch applications, which share some important similarities and some crucial differences. Capacitive sensing applications can require relatively large target distances and/or higher resolution than capacitive touch applications.
Low (< 4)
High (> 8)
Up to 70 cm
2 to 3 mm
< 1 fF
10s to 100s fF
μA to mA range
For more information on capacitive touch solutions, please consider TI's capTIvate as the best fit for this application.
A list of learning and design resources, sorted by subject, are given below.
App Note Title
App Note URL
Introductory App Notes
Common Inductive and Capacitive Sensing Applications
Basics of Capacitive Sensing with FDC1004
Liquid Level Sensing App Notes
Capacitive Sensing: Ins and Outs of Active Shielding
Capacitive Sensing: Out-of-Phase Liquid Level Technique
Capacitive Sensing: Direct vs Remote Liquid-Level Sensing Performance Analysis
Liquid Level Sensing with the Immersive Straw Approach
How to Calibrate FDC1004 for Liquid Level Sensing Applications
Capacitive Proximity Sensing Using the FDC1004
General App Notes, Technical Articles and Blogs
Derivative Integration Algorithm for Proximity Sensing
Ground Shifting in Capacitive Sensing Applications
Power Reduction Techniques for the FDC2214/2212/2114/2112 in Capacitive Sensing Applications
Capacitive sensing: simple algorithm for proximity sensing
Capacitive sensing: which architecture should you choose?
Capacitive Based Liquid Level Sensing - TIDA-00317 (FDC1004 , MSP430F5528 )
Backlight and Smart Lighting Control by Ambient Light and Proximity Sensor Reference Design - TIDA-00373 (FDC1004 , HDC1000 , HDC1008 )
Automotive Capacitive Proximity Kick to Open Detection Reference Design TIDA-00506 (FDC1004)
Capacitive-Based Human Proximity Detection for System Wake-Up & Interrupt Reference Design - TIDA-00220 (FDC1004 , LM3630A , LP5907 )
FDC1004EVM - 4 Channel Capacitive to Digital Converter Evaluation Module
Capacitive Sensing Sample Code (Energia)
Sensing Solutions EVM GUI Tool
The table below shows & compares the major features of the two devices.
Number of Channels
2 or 4
Resonant LC Tank
Sensor driving Frequency
0.1Mhz - 10 MHz
Maximum Sensor Input
250nF @ 10Khz / 25pF @ 10 MHz
Sensor input range w/respect to input offset calibration
Input Offset Calibration
Integrated Shield Driver
Continuous CLK driver
Discontinuous Sin Driver
12/28 bits depending on the LC frequency
Gain Error over temp
Depends on External LC
Poor, needs external passives
High SW and HW
1. Independent channels The FDC1004 features 4 independent channels that are sampled sequentially in a time-multiplexed manner. Typical applications include rain sensing, proximity/gesture detection, and water/ice/snow detection.
Figure 1. Independent Channel use Case for Gesture Sensing Application
2. Differential or ratio-metric measurementsDifferential measurements are performed to obtain an accurate capacitance measurement difference between two sensors. This is most applicable to environmental factors that can cause variations in capacitance, such as direct, immersive sensing, or remote liquid sensing.
John MillerSensing Applications Engineer
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