QT113H ETC, QT113H Datasheet

QT113H

Manufacturer Part Number

QT113H

Description

CHARGE-TRANSFER TOUCH SENSOR

Manufacturer

ETC

Datasheet

1.QT113H.pdf (12 pages)

Current page: 1 of 12
Download datasheet (181Kb)

APPLICATIONS -

The QT113 charge-transfer (“QT’”) touch sensor is a self-contained digital IC capable of detecting near-proximity or touch. It will

project a proximity sense field through air, via 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 responsive 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 QT113 requires only a common inexpensive capacitor in order to function.

Power consumption is only 600 A in most applications. In most cases the power supply need only be minimally regulated, for example

by Zener diodes or an inexpensive 3-terminal regulator.

The QT113’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

analog components aside from C

The option-selectable toggle mode permits on/off touch control, for example for light switch replacement. The Quantum-pioneered

HeartBeat™ signal is also included, allowing a host microcontroller to monitor the health of the QT113 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

! ! ! ! Projects a proximity field through air

! ! ! ! Less expensive than many mechanical switches

! ! ! ! Sensitivity easily adjusted via capacitor value

! ! ! ! Turns small objects into intrinsic touch sensors

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

! ! ! ! 2.5 to 5V, 600 A single supply operation

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

! ! ! ! 10s, 60s, infinite auto-recal timeout (strap options)

! ! ! ! Gain settings in 2 discrete levels

! ! ! ! HeartBeat™ health indicator on output

! ! ! ! Active-low (QT113) or active-high outputs (QT113H)

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

Light switches

Prox sensors

-40

are usually required.

C to +70

C to +85

Appliance control

Security systems

AVAILABLE OPTIONS

QT113H-IS

QT113H-S

QT113-IS

QT113-S

SOIC

Access systems

Pointing devices

HARGE

and electrode C

QProx™ ™ ™ ™ QT113 / QT113H

-T

O pt1

O pt2

QT113H-D

V d d

8-PIN DIP

O ut

QT113-D

RANSFER

. No external switches, opamps, or other

Elevator buttons

Toys & games

OUCH

R1.10/0104

ENSOR

Vss

Sn s2

Sn s1

Gain

Related parts for QT113H

QT113H Summary of contents

Page 1

... Toggle mode for on/off control (strap option 10s, 60s, infinite auto-recal timeout (strap options Gain settings in 2 discrete levels ! ! ! ! HeartBeat™ health indicator on output ! ! ! ! Active-low (QT113) or active-high outputs (QT113H Only one external part required - a 1¢ capacitor APPLICATIONS - ! Light switches ...

Page 2

OVERVIEW The QT113 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

Cx than a solid plane. Sensitivity may even remain the same, as the sensor will be operating in a lower region of the gain curves. 1.3.2 K ’ C ...

Page 4

Shielding Against Fringe Fields Figure 1-5 Sen se Sense wire U nshielded Electrode 4-1 to 4-3). The value of Cs also has a dramatic effect on sensitivity, and this can be increased in value ( limit). Also, increasing ...

Page 5

... This makes the sensor respond in an on/off mode like a flip flop most useful for controlling power loads, for example in kitchen appliances, power tools, light switches, etc. Max On-Duration in Toggle mode is fixed at 10 seconds. When a timeout occurs, the sensor recalibrates but leaves the output state unchanged ...

Page 6

... RC timeconstant to filter the output interfacing directly and only to a high-impedance CMOS input, by doing nothing or at most adding a small non-critical capacitor from Out to ground (Figure 2-5). The QT113H variant has an active-high output; the heartbeat signal of the QT113H works in exactly the same manner. 2.2 UTPUT RIVE The QT113’ ...

Page 7

Figure 3-1 ESD Suppression Circuit + OUT PT1 G AIN PT2 digital spikes, sags, ...

Page 8

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

Page 9

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 10

... ORDERING INFORMATION PART QT113-D QT113-S QT113-IS QT113H-D QT113H-S QT113H-IS Chart 4-3 - Typical Response Time vs. Cx; Vdd = 3.0 100.00 10.00 1. Load TEMP RANGE PACKAGE 0 - 70C 0 - 70C -40 - 85C 0 - 70C 0 - 70C -40 - 85C - 10 - 10nF 20nF 50nF 100nF 200nF 500nF 30 40 MARKING PDIP QT1 + 13 SOIC-8 QT1 + 3 ...

Page 11

Package type: 8-pin 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 12

Quantum Research Group Ltd Enterprise House, Southampton, Hants SO14 3XB Tel: +44 (0)23 8045 3934 Fax: +44 (0)23 8045 3939 This device expressly not for use in any medical or human safety related application without the express written consent of ...

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