QT60326, QT60486

APPLICATIONS -

Automotive panels

Machine tools

ATM machines

Touch-screens

Appliance controls

Outdoor keypads

Security keypanels

Industrial keyboards

These digital charge-transfer (“QT”) QMatrix™ ICs are designed to detect human touch on up 48 keys when used with a scanned,

passive X-Y matrix. They will project touch keys through almost any dielectric, e.g. glass, plastic, stone, ceramic, and even wood, up to

thicknesses of 5 cm or more. The touch areas are defined as simple 2-part interdigitated electrodes of conductive material, like copper

or screened silver or carbon deposited on the rear of a control panel. Key sizes, shapes and placement are almost entirely arbitrary;

sizes and shapes of keys can be mixed within a single panel of keys and can vary by a factor of 20:1 in surface area. The sensitivity of

each key can be set individually via simple functions over the SPI or UART port, for example via Quantum’s QmBtn program, or from a

host microcontroller. Key setups are stored in an onboard eeprom and do not need to be reloaded with each powerup.

These devices are designed specifically for appliances, electronic kiosks, security panels, portable instruments, machine tools, or

similar products that are subject to environmental influences or even vandalism. It can permit the construction of 100% sealed,

watertight control panels that are immune to humidity, temperature, dirt accumulation, or the physical deterioration of the panel surface

from abrasion, chemicals, or abuse. To this end the device contains Quantum-pioneered adaptive auto self-calibration, drift

compensation, and digital filtering algorithms that make the sensing function robust and survivable.

The parts can scan matrix touch keys over LCD panels or other displays when used with clear ITO electrodes arranged in a matrix.

They do not require 'chip on glass' or other exotic fabrication techniques, thus allowing the OEM to source the matrix from multiple

vendors. Materials such as such common PCB materials or flex circuits can be used.

External circuitry consists of a resonator and a few passive parts, all of which can fit into a 6.5 sq cm footprint (1 sq inch). Control and

data transfer is via either an SPI or UART port.

These devices make use of an important new variant of charge-transfer sensing, transverse charge-transfer, in a matrix format that

minimizes the number of required scan lines. Unlike older methods, it does not require one IC per key.

Copyright © 2003-2005 QRG Ltd

QT60486-AS R8.01/0105

Advanced second generation QMatrix™ controller

Keys individually adjustable for sensitivity, response

time, and many other critical parameters

Panel thicknesses to 50mm through any dielectric

32 and 48 key versions

100% autocal for life - no in-field adjustments

SPI Slave and UART interfaces

Sleep mode with wake pin

Adjacent key suppression feature

Synchronous noise suppression pin

Spread-spectrum modulation: high noise immunity

Mix and match key sizes & shapes in one panel

Low overhead communications protocol

FMEA compliant design features

Negligible external component count

Extremely low cost per key

44-pin Pb-free TQFP package

MOSI

MISO

SCK

/RST

Vdd

Vss

XT2

XT1

RX

TX

WS

X4

X5

X6

X7

Vdd

Vss

Vdd

Y0B

Y1B

Y2B

Y3B

1

2

3

4

5

6

7

8

9

10

11

23

24

25

26

27

28

29

30

31

32

33

44 43 42 41 40 39 38 37 36

34

35

12 13 14

22

21

19 20

18

17

16

15

QT60326

QT60486

TQFP-44

QT60486-AS-G

48

QT60326-AS-G

32

Part Number

# Keys

AVAILABLE OPTIONS