Touchkeys

Elatec represents Quantum Research Group that develops and markets capacitive sensor ICs for switching and control applications based on its patented charge-transfer (QT) capacitive sensing technology which is more stable and more accurate than other types of capacitive switching and has a dynamic range of several decades. It involves charging a sense electrode - which can be anything electrically conductive - then transferring that charge to a detector comprised of another known capacitor. The charge transfer acquisition process is carried out in burst mode using microprocessor-controlled switching of MOSFET transistors. The presence of external capacitance caused by an object such as a finger affects the flow of charge to permit sensing.

Spread-spectrum sensing mode uses sparse, randomized charging pulses with long delays between bursts. Individual pulses can be as short as 5% or less of the intra-burst pulse spacing. The benefits of this spread-spectrum approach include lower cross-sensor interference, reduced RF emissions and susceptibility, and very low power consumption

Part Number Suggested Alternative  # QTouch™ Channels # QMatrix™ Channels (W)heel or
(S)lider
Packages Temp
(°C)
Eval Board

QTouch™ Chips

QT100

1

 

SOT23-6

-40~85

E100S

QT110

QT100

1

 

DIP8, SO8

0~70, -40~85

E11x

QT113

QT100

1

 

DIP8, SO8

0~70, -40~85

E11x

QT118H

QT100

1

 

DIP8, SO8

0~70, -40~85

E11x

QT220

2

 

SSOP20

-40~85

E240B

QT240

4

 

SSOP20

-40~85

E240B

QT1080

QT1081

8

 

QFN32

-40~85

E1080

QT1081

8

 

QFN32

-40~85

QT1101

QT1103

10

 

QFN32

-40~85

QT1103 *

10

 

QFN32

-40~85

QMatrix™ Chips

QT60160

 

16

MLF32

-40~85

E6240

QT60168

 

16

TQFP32

-40~105

E6248

QT60240

 

24

MLF32

-40~85

E6240

QT60248

 

24

TQFP32

-40~105

E6248

QT60326

 

32

TQFP44

-40~105

E6486

QT60486

 

48

TQFP44

-40~105

E6486

Wheel & Slider Chips

QT411

 

 

S

TSSOP14

-40~85

E411

QT511

 

 

W

TSSOP14

-40~85

E511

QT1106

7

 

W or S

QFN32

-40~85

E1106