QT115-S Atmel, QT115-S Datasheet

QT115-S

Manufacturer Part Number

QT115-S

Description

SENSOR IC TOUCH/PROXMTY 1CH8SOIC

Manufacturer

Atmel

Series

QProx™r

Type

Capacitiver

Datasheets

1.QT110-D.pdf (13 pages)

2.QT111-D.pdf (6 pages)

Specifications of QT115-S

Rohs Status

RoHS non-compliant

Touch Panel Interface

1, 2-Wire

Number Of Inputs/keys

10 Key

Resolution (bits)

14 b

Data Interface

Serial

Voltage Reference

Internal

Voltage - Supply

3 V ~ 5 V

Current - Supply

60µA

Operating Temperature

0°C ~ 70°C

Mounting Type

Surface Mount

Package / Case

8-SOIC (3.9mm Width)

Output Type

Interface

Input Type

Other names

427-1019

Current page: 1 of 13
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APPLICATIONS -

The QT110 / QT110H charge-transfer (“QT’”) touch sensor is a self-contained digital IC capable of detecting near-proximity or touch.

It will project a sense field through almost any dielectric, like glass, plastic, stone, ceramic, and most kinds of wood. It can also turn

small metal-bearing objects into intrinsic sensors, making them respond to proximity or touch. This capability coupled with its ability

to self calibrate continuously can lead to entirely new product concepts.

It is designed specifically for human interfaces, like control panels, appliances, toys, lighting controls, or anywhere a mechanical

switch or button may be found; it may also be used for some material sensing and control applications provided that the presence

duration of objects does not exceed the recalibration timeout interval.

The IC requires only a common inexpensive capacitor in order to function. A bare piezo beeper can be connected to create a ‘tactile’

feedback clicking sound; the beeper itself then doubles as the required external capacitor, and it can also become the sensing

electrode. An LED can also be added to provide visual sensing indication. With a second inexpensive capacitor the device can

operated in 2-wire mode, where both power and signal traverse the same wire pair to a host. This mode allows the sensor to be wired

to a controller with only a twisted pair over a long distances.

Power consumption is under 20 A in most applications, allowing operation from Lithium cells for many years. In most cases the

power supply need only be minimally regulated.

The IC’s RISC core employs signal processing techniques pioneered by Quantum; these are specifically designed to make the device

survive real-world challenges, such as ‘stuck sensor’ conditions and signal drift. Even sensitivity is digitally determined and remains

constant in the face of large variations in sample capacitor C

components aside from C

The device includes several user-selectable built in features. One, toggle mode, permits on/off touch control, for example for light

switch replacement. Another makes the sensor output a pulse instead of a DC level, which allows the device to 'talk' over the power

rail, permitting a simple 2-wire interface. The Quantum-pioneered HeartBeat™ signal is also included, allowing a host controller to

monitor the health of the QT110 continuously if desired. By using the charge transfer principle, the IC delivers a level of performance

clearly superior to older technologies in a highly cost-effective package.

Quantum Research Group Ltd

! ! ! ! Less expensive than many mechanical switches

! ! ! ! Projects a ‘touch button’ through any dielectric

! ! ! ! Turns small objects into intrinsic touch sensors

! ! ! ! 100% autocal for life - no adjustments required

! ! ! ! Only one external part required - a 1¢ capacitor

! ! ! ! Piezo sounder direct drive for ‘tactile’ click feedback

! ! ! ! LED drive for visual feedback

! ! ! ! 2.5 to 5V 20 A single supply operation

! ! ! ! Toggle mode for on/off control (strap option)

! ! ! ! 10s or 60s auto-recalibration timeout (strap option)

! ! ! ! Pulse output mode (strap option)

! ! ! ! Gain settings in 3 discrete levels

! ! ! ! Simple 2-wire operation possible

! ! ! ! HeartBeat™ health indicator on output

! ! ! ! Active Low (QT110), Active High (QT110H) versions

Light switches

Industrial panels

are usually required.

-40

C to +70

C to +85

Appliance control

Security systems

AVAILABLE OPTIONS

QT110H-IS

QT110H-S

QT110-IS

QT110-S

SOIC

and electrode C

Access systems

Pointing devices

HARGE

QProx™ ™ ™ ™ QT110 / QT110H

. No external switches, opamps, or other analog

-T

RANSFER

Opt1

Opt2

8-PIN DIP

QT110H-D

Vdd

QT110-D

Out

Elevator buttons

Toys & games

OUCH

Vss

Sns2

Sns1

Gain

R1.02/0109

ENSOR

Related parts for QT115-S

QT115-S Summary of contents

Page 1

Less expensive than many mechanical switches ! ! ! ! Projects a ‘touch button’ through any dielectric ! ! ! ! Turns small objects into intrinsic touch sensors ! ! ! ! 100% autocal for life ...

OVERVIEW The QT110 is a digital burst mode charge-transfer (QT) sensor designed specifically for touch controls; it includes all hardware and signal processing functions necessary to provide stable sensing under a wide variety of changing conditions. Only a ...

Page 3

Multiple touch electrodes can be used, for example to create a control button on both sides of an object, however it is impossible for the sensor to distinguish ...

Page 4

Shielding Against Fringe Fields Figure 1-6 Sen se Sens e w ire U ns hielded Electrod e A ‘virtual capacitive ground’ can be created by connecting the QT110’s own circuit ground to: (1) A nearby piece of metal or metallized ...

Page 5

A deliberately added Cx capacitor can also ...

Page 6

ORCED ENSOR ECALIBRATION The QT110 has no recalibration pin; a forced recalibration is accomplished only when the device is powered up. However, supply drain is so low simple matter to treat the entire ...

Page 7

Figure 2-5 Eliminating HB Pulses G ATE OR MIC RO INPU 100p F O PT1 4 O PT2 2.2 IEZO COUSTIC RIVE A piezo drive signal ...

Page 8

The Gain input is designed to be floated for sensing one of the three gain settings. It should never be connected to ...

Page 9

Re2 functions to isolate the transient from the Vdd pin; values of around 1K ohms are reasonable. As with all ESD protection networks crucial that the transients be led away from the circuit. PCB ground layout is crucial; ...

Page 10

ABSOLUTE MAXIMUM SPECIFICATIONS Operating temp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 11

DC SPECIFICATIONS Vdd = 3.0V 10nF 5pF, T Parameter Description V Supply voltage DD I Supply current DD V Supply turn-on slope DDS V Low input logic level IL V High input logic level HL ...

Page 12

Package type: 8pin Dual-In-Line Millimeters SYMBOL Min a 6.096 A 7.62 M 9.017 m 7.62 Q 0.889 P 0.254 L 0.355 L1 1.397 F 2.489 R 3.048 r 0.381 S 3.048 7.62 x 8.128 Y 0.203 Millimeters ...

Page 13

ORDERING INFORMATION PART QT110-D QT110-S QT110-IS QT110H-D QT110H-S QT110H-IS Quantum Research Group Ltd Enterprise House, Southampton, Hants SO14 3XB Tel: +44 (0)23 8045 3934 Fax: +44 (0)23 8045 3939 Notice: This device expressly not for use in any ...

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