LQ
QT60320D
32-KEY QMATRIX™ CHARGE-TRANSFER IC
ꢀ Creates 32 ‘touch buttons’ through any dielectric
ꢁ 100% autocal for life - no adjustments required
ꢀ
ꢀ
ꢀ
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'N' key rollover: senses all 32 keys in parallel
Keys individually adjustable for sensitivity
Mix 'n match key sizes & shapes in one panel
Tolerates a 20:1 variance in key sizes on a panel
34
33
44 43 42 41 40 39 38 37 36 35
X6
X7
1
2
3
4
5
6
7
8
9
I1
32
31
30
29
28
27
26
25
24
23
CC1
CC2
CS
X8
RST
Vcc
Gnd
XT2
XT1
RX
Aref
AGnd
Vcc
O8
ꢁ Panel thicknesses to 5 cm or more
QT60320
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
Back lit keys possible with ITO electrodes
LED status function drives
User-addressable multifunction drive pins
User-addressable internal eeprom
Simple, universal serial interface
5V single supply operation
O7
TX
10
11
O6
O1
O5
13
15 16
18 19 20 21
17 22
12
14
44-pin TQFP package
One square inch (6.5 square cm) of PCB required
APPLICATIONS -
ꢀ Security keypanels
ꢀ Industrial keyboards
ꢀ Appliance controls
ꢀ Outdoor keypads
ꢀ ATM machines
ꢀ Touch-screens
ꢀ Automotive panels
ꢀ Machine tools
The QT60320D digital charge-transfer (“QT”) QMatrix™ IC is designed to detect touch on up to 32 keys in a scanned X-Y matrix. It will
project the keys through almost any dielectric, like glass, plastic, stone, ceramic, and even most kinds of 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,
Indium-Tin-Oxide (ITO), or screened silver or carbon deposited on the rear of the 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 or more
in area. The gain (sensitivity) and threshold of each key can be set individually via simple commands over the UART port, for example
via the freeware QmBtn program. Key setups are stored internally in an onboard eeprom and do not need to be reloaded.
The IC is designed specifically to work with appliances, ATM machines, security panels, portable instruments, machine tools, or
similar products that are subject to environmental 'challenges' or even physical attack. It permits the construction of 100% sealed,
watertight keypanels that are immune to environmental factors such as humidity and condensation, temperature, dirt accumulation, or
the physical deterioration of the panel surface from abrasion, chemicals, or abuse. To this end the QT60320D contains
Quantum-pioneered self-calibration, drift compensation, and digital filtering algorithms that make the sensing function extremely
robust and survivable.
The device can readily control keys over graphical LCD panels or LEDs when used with clear, conductive ITO electrodes. It does not
require 'chip on glass' or other exotic fabrication techniques, thus allowing the OEM to source the keymatrix from multiple vendors.
External circuitry consists of an opamp, a common PLD, and a quad fet switch, which can fit into a footprint of roughly 1 square inch
(6.5 sq. cm). The device also can control two status LEDs, and includes in addition 8 addressable output drive lines and 4 readable
spare input lines which can be used to control LEDs, LCDs, or other panel functions without requiring additional control lines from the
host CPU. It also makes available to the user 86 bytes of onboard writeable and readable eeprom via the serial interface, thus helping
to reduce system cost by eliminating extra components.
QT60320D technology makes use of an important new variant of charge-transfer sensing, transverse charge-transfer, in an XY format
that minimizes the number of required scan lines. Unlike older technologies it does not require one IC per key, and is cost competitive
even with some membrane technologies. In many cases it can also replace resistive XY sense elements commonly used in touch
screens, at a fraction of the price.
The QT60320D is an improved version of the QT60320C, having lower noise and wider temperature range than the original
part. Prior silicon versions will not be available after December 2003.
AVAILABLE OPTIONS
TA
-400C to +1050C
TQFP
QT60320D-AS
LQ
Copyright © 1999, 2001 Quantum Research Group Ltd
QT60320D R1.11/12.07.03
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