Interlink electronics FSR Guía de configuración rápida

www.interlinkelectronics.com

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

Force Sensing Linear Potentiometer (FSLP)

Integration Guide

Table of Contents

1.0 Introduction.................................................................................................................... 1

2.0 Scope................................................................................................................................1

3.0 Theory of Operation .................................................................................................... 2

4.0 Mounting and Connection ......................................................................................... 5

4.1 Mounting............................................................................................................. 5

4.2 FSLP Types........................................................................................................ 5

4.3 Crimp Terminal Connections (10cm and derivatives only) ................................ 7

4.4 FFC Connection Method .................................................................................... 8

5.0 Measurement Techniques and Algorithms.......................................................... 9

5.1 Measuring Position........................................................................................... 10

5.2 Measuring Pressure ......................................................................................... 10

6.0 Actuator......................................................................................................................... 12

7.0 Orderable Part Numbers.......................................................................................... 12

8.0 Intellectual Property & Other Legal Matters.................................................... 12

9.0 Contact Interlink Electronics ................................................................................ 13

www.interlinkelectronics.com

Force Sensing Linear Potentiometer (FSLP)

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. Measurement is

simple enough that it can be accomplished directly with the device's host processor without the

need for a dedicated microprocessor.

The purpose of this document is to guide users through the successful integration of the Interlink

Electronics FSLP.

2.0 Scope

This Integration Guide provides the OEM integrator with all of the necessary technical information

to successfully integrate the FSLP into products such as:

Personal media players

Mobile phones

Control panels

Medical instruments

Home entertainment devices

Sensor part number is detailed in section 7.

www.interlinkelectronics.com

Force Sensing Linear Potentiometer (FSLP)

Integration Guide

3.0 Theory of Operation

The most basic Force Sensing Resistor (FSR) consists of two membranes separated by a thin air

gap. The air gap is maintained by a spacer around the edges and by the rigidity of the two

membranes. One of the membranes has two sets of fingers which are interdigitated and

electrically distinct; each set connects to one trace on the tail. 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.

Figure 1: Exploded view of a standard single-zone FSR

www.interlinkelectronics.com

Force Sensing Linear Potentiometer (FSLP)

Integration Guide

Like the basic single-zone FSR, the Interlink Electronics FSLP has an FSR ink layer and a

conductor substrate layer separated by an adhesive spacer. The FSLP’s conductor layer

however, is not simply a set of interdigitated silver fingers; it consists of two drive lines connected

to either end of a printed fixed resistor and a sense line. Silver fingers orthogonally protrude along

the entire length of the fixed resistor. 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.

Figure 2: Exploded view of the FSLP.

www.interlinkelectronics.com

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. R2 is the resistance from the touch spot down to sensor

terminal 3. Rp is connected to the junction between R1 and R2 by the user’s touch. As the user

varies the touch spot from the top of the sensor to the bottom of the sensor, R1 becomes larger

and R2 becomes smaller. As the user presses harder, Rp decreases. Rp varies from around

300kΩat very light touches to 2kΩat extremely heavy touches. The resistance is roughly

proportional to the reciprocal of the force.

Figure 3: Schematic representation of the FSLP.

www.interlinkelectronics.com

Force Sensing Linear Potentiometer (FSLP)

Integration Guide

4.0 Mounting and Connection

4.1 Mounting

There are a few critical elements to consider when mounting the FSLP:

The mounting surface should be free of any raised features (e.g. copper traces on a PCB

or dust contamination) as they will interfere with the sensor’s proper operation.

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

any air bubbles.

4.2 FSLP Types

39.3±0.10

13.5±0.10

36.3

(ACTIVE AREA)

14.0

5.0

9.8

(ACTIVE AREA)

T=0.61±0.06

0.34±0.04

Figure 4: Overall dimensions of the standard FSLP. All dimensions are in millimeters.

www.interlinkelectronics.com

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

Force Sensing Linear Potentiometer (FSLP)

Integration Guide

4.3 Crimp Terminal Connections (10cm and derivatives only)

Figure 6: Crimp Terminal Connections.

www.interlinkelectronics.com

Force Sensing Linear Potentiometer (FSLP)

Integration Guide

4.4 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. All dimensions are in millimeters.

Figure 8: Side view of sensor tail. All dimensions are in millimeters.

Tabla de contenidos

Manuales populares de Accesorios de otras marcas

Hillco

Hillco 2810 Manual de usuario

Siemens

Siemens QSA2700D Manual del operador

Contours

Contours ZY024 Manual de usuario

Saivod

Saivod VS621 Manual de usuario

Virtuox

Virtuox VirtuCLEAN 2.0 Manual de usuario

SCE

SCE ENVIRO-THERM SCE-TE170B24VSS Manual de usuario

Z-Wave

Z-Wave HSD-200Z Manual de usuario

turck

turck FMX-IM-2UPLI63FX Manual de usuario

Decagon Devices

Decagon Devices 10HS Manual de usuario

UPPAbaby

UPPAbaby Cup Holder Manual de usuario

Elko

Elko SmartSensor Leakage Wireless Manual de usuario

Grizzly

Grizzly H8371 Manual de usuario

Panasonic

Panasonic HG-T Series Manual de usuario

IFM Electronic

IFM Electronic Efector 250 Series Guía de referencia

DigiDesign

DigiDesign 888/24 I/O Manual de usuario

PROZIS

PROZIS QUAY Manual de usuario

patagonia

patagonia PSI Vest Manual de usuario

SFC Energy

SFC Energy EFOY GO! Manual de usuario