QST1508CT0 datasheet, PDF - EEWORLD Datasheet

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QST1508CT0: DescriptionCapacitive touch sensor device 8 keys with individual key state outputs or I2C interface; File Size396KB，51 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/

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QST1508CT0 Overview

Capacitive touch sensor device 8 keys with individual key state outputs or I2C interface

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QST108

Capacitive touch sensor device

8 keys with individual key state outputs or I2C interface

Not For New Design

Features

■

Patented charge-transfer design

Up to 8 independent QTouch™ keys supported

Individual key state outputs or I

C interface

Fully “debounced” results

Patented AKS™ Adjacent Key Suppression

Self-calibration and auto drift compensation

Spread-spectrum bursts to reduce EMI

Up to 5 general-purpose outputs

ECOPACK® (RoHS compliant) package

LQFP32 (7x7 mm)

Description

The QST108 is the ideal solution for the design of

capacitive touch sensing user interfaces.

Touch-sensitive controls are increasingly

replacing electromechanical switches in home

appliances, consumer and mobile electronics,

and in computers and peripherals. Capacitive

touch controls allow designers to create stylish,

functional, and economical designs which are

highly valued by consumers, often at lower cost

than the electromechanical solutions they

replace.

The QST108 QTouch™ sensor IC is a pure digital

solution based on Quantum's patented charge-

transfer (QProx™) capacitive technology.

QTouch™ and QProx™ are trademarks of the

Quantum Research Group.

Applications

This device specifically targets human interfaces

and front panels for a wide range of applications

such as PC peripherals, home entertainment

systems, gaming devices, lighting and appliance

controls, remote controls, etc.

QST devices are designed to replace mechanical

switching/control devices and the reduced

number of moving parts in the end product

provides the following advantages:

■

Lower customer service costs

Reduced manufacturing costs

Increased product lifetime

Device summary

Table 1.

Order codes

Feature

QST108KT6

Operating supply voltage

Supported interfaces

Operating temperature

Package

2.4 to 5.5 V

Individual key state outputs or I

C Interface

-40° to +85° C

LQFP32 (7x7 mm)

July 2008

Rev 5

1/51

www.st.com

This is information on a product still in production but not recommended for new designs.

Contents

QST108

Contents

Device overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

QST touch sensing technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.1

3.2

3.3

3.4

3.5

3.6

3.7

3.8

3.9

3.10

3.11

Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Spread-spectrum operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Faulty and unused keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Detection threshold levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Detection integrator filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Self-calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Fast positive recalibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Forced key recalibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Max On-Duration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Drift compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Adjacent key suppression (AKS™) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Device operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1

4.2

4.3

4.4

4.5

Reset and power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Burst operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Low power mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Stand-alone mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.5.1

4.5.2

4.5.3

Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

KOUT outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Option descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

General-purpose outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

IRQ pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Communication packet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

I2C address selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.6

I2C mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.6.1

4.6.2

4.6.3

4.6.4

4.6.5

4.7

Supported commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2/51

QST108

Contents

Design guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.1

5.2

sense capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Sensitivity tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.2.1

5.2.2

5.2.3

Increasing sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Decreasing sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Key balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.3

5.4

5.5

5.6

Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

ESD protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Crosstalk precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

PCB layout and construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

6.1

Parameter conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

6.1.1

6.1.2

6.1.3

6.1.4

6.1.5

Minimum and maximum values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Typical values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Typical curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Loading capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Pin input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

6.2

6.3

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

EMC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

6.3.1

6.3.2

6.3.3

Functional EMS (electro magnetic susceptibility) . . . . . . . . . . . . . . . . . 32

Electro magnetic interference (EMI) . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Absolute maximum ratings (electrical sensitivity) . . . . . . . . . . . . . . . . . 33

6.4

6.5

6.6

6.7

Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Supply current characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Capacitive sensing characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

KOUTn/OPTn/GPOn pin characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.7.1

6.7.2

General characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Output pin characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.8

6.9

RESET pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

I2C control interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

7.1

Soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Device revision information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

3/51

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