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Force Sensing Linear Potentiometer (FSLP)
Integration Guide
Interlink Electronics
FSR
Force Sensing Resistors
®
®
Force Sensing Linear Potentiometer (FSLP)
Integration Guide
Document P/N: 94-00022 Rev. C
Interlink Electronics and the six dot logo are registered trademarks of Interlink Electronics, Inc.
www.interlinkelectronics.com
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Table of Contents
Summary of Contents for Interlink electronics FSR
- Page 1 Force Sensing Linear Potentiometer (FSLP) Integration Guide Interlink Electronics Force Sensing Resistors ® ® Force Sensing Linear Potentiometer (FSLP) Integration Guide Document P/N: 94-00022 Rev. C Interlink Electronics and the six dot logo are registered trademarks of Interlink Electronics, Inc. www.interlinkelectronics.com...
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Page 2: Table Of Contents
Crimp Terminal Connections (10cm and derivatives only) ........ 7 FFC Connection Method ..................8 Measurement Techniques and Algorithms............9 Measuring Position................... 10 Measuring Pressure ..................10 Actuator......................... 12 Orderable Part Numbers ..................12 Intellectual Property & Other Legal Matters............ 12 Contact Interlink Electronics ................13 www.interlinkelectronics.com... -
Page 3: Introduction
Integration Guide 1.0 Introduction The Interlink Electronics Standard Force Sensing Linear Potentiometer (FSLP) is a linear position sensor for menu navigation and control. It functions as a linear potentiometer with the ability to detect a user's force for variable rate scrolling and a more intuitive user experience. The FSLP is an easy to integrate, high resolution, ultra low-power package ideal for media players, mobile phones, control panels, medical instruments and home entertainment devices. -
Page 4: Theory Of Operation
The other membrane is coated with FSR ink. When the two layers are pressed together, the FSR ink shorts the two traces together with a resistance that depends on applied force. - Page 5 These silver fingers are interdigitated with the sense line. When the FSR ink and conductor membranes are pressed together, the sense line is shorted to a point along the fixed resistor through the orthogonally protruding fingers. The resistance from either drive line to the touch point is proportional to the location of the touch along the length of the fixed resistor.
- Page 6 Force Sensing Linear Potentiometer (FSLP) Integration Guide Figure 3 shows a schematic view of the sensor. Notice that the sensor is a three-terminal device and when touched, has a circuit that is equivalent to three resistors. R1 is the resistance from sensor terminal 2 to the touch spot.
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Page 7: Mounting And Connection
If the sensor is being mounted to a PCB, it should be installed after PCB assembly is complete. Heat generated during the soldering of components can damage the FSR. When laminating the sensor, be sure to use a hard roller or other depression tool to ensure proper bonding of the sensor’s pressure-sensitive adhesive and the removal of... - Page 8 Force Sensing Linear Potentiometer (FSLP) Integration Guide Figure 5: Overall dimensions of the 10 cm FSLP. All dimensions are in millimeters. (shown without crimp terminals) The 10cm FSLP can be customized to shorter pre-defined lengths. Refer to User’s Customization Guide provided with the Hardware Development Kit. www.interlinkelectronics.com...
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Page 9: Crimp Terminal Connections (10Cm And Derivatives Only)
Force Sensing Linear Potentiometer (FSLP) Integration Guide Crimp Terminal Connections (10cm and derivatives only) Figure 6: Crimp Terminal Connections. www.interlinkelectronics.com... -
Page 10: Ffc Connection Method
Force Sensing Linear Potentiometer (FSLP) Integration Guide FFC Connection Method Recommended Tail Connector: JST 4-pin SMT connector (JST Part Number: 04FM-1.0SP-1.9-TF) Interlink recommends the above connector, but any compatible connector may be used. Refer to Figures 7 and 8 for sensor tail dimensions. Figure 7: Top view of sensor tail. -
Page 11: Measurement Techniques And Algorithms
Integration Guide 5.0 Measurement Techniques and Algorithms The Interlink Electronics FSLP can measure position and pressure. The connection to the measuring microprocessor is very simple and requires only one external component. The microprocessor will need two general purpose IO (GPIO) pins and two GPIO/analog-to-digital converter (ADC) pins. -
Page 12: Measuring Position
Force Sensing Linear Potentiometer (FSLP) Integration Guide 5.1 Measuring Position Step 1: Clear Charge on Sensor Enable all lines as outputs and set them to 0 Volts. This will clear all charge from the sensor and help reduce noise on readings. Step 2: Set Up Appropriate Driveline Voltages ... - Page 13 Force Sensing Linear Potentiometer (FSLP) Integration Guide Step 3: Take two measurements Take an ADC reading on the ADC connected to sensor terminal 3. Call this V1. Take an ADC reading on the ADC connected to senor terminal 1. Call this V2. Step 4: Calculate the pressure ...
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Page 14: Actuator
Force Sensing Linear Potentiometer (FSLP) Integration Guide 6.0 Actuator The Interlink Electronics FSLP has a protective graphic overlay; this allows for a finger or custom stylus to be used. 7.0 Orderable Part Numbers Hardware Development Kit (54-00019) QTY 1 Demo Board with FSLP Standard Sensor... -
Page 15: Contact Interlink Electronics
Force Sensing Linear Potentiometer (FSLP) Integration Guide 9.0 Contact Interlink Electronics United States Corporate Office Interlink Electronics, Inc. 546 Flynn Road Camarillo, CA 93012, USA Phone: +1-805-484-8855 Fax: +1-805-484-9457 Web: www.interlinkelectronics.com Sales and support: sales@interlinkelectronics.com Japan Japan Sales Office Kannai-Keihin Bldg. 10F/1004...
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