lQ
QProx™ QT60168, QT60248
16, 24 K
EY
QM
ATRIX
™ IC
s
/RST
X0
Y2A
Y2B
Y0A
Y1A
Second generation charge-transfer QMatrix technology
Keys individually adjustable for sensitivity, response
time, and many other critical parameters
Panel thicknesses to 50mm through any dielectric
16 and 24 touch key versions
100% autocal for life - no adjustments required
SPI slave interface
Adjacent key suppression feature
Synchronous noise suppression feature
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
+3 to +5V single supply operation
32-pin lead-free TQFP package
X3
X4
VSS
VDD
VSS
VDD
X5
X6
1
2
3
4
5
6
7
8
32 31 30 29 28 27 26 25
24
23
X1
X2
VREF
X7
Y1B
Y0B
n/c
VSS
VDD
SYNC
VDD
SCK
QT60248
QT60168
TQFP-32
22
21
20
19
18
17
9 10 11 12 13 14 15 16
SMP
S_SYNC
/SS
MISO
MOSI
DRDY
APPLICATIONS
Security keypanels
Industrial keyboards
Appliance controls
Outdoor keypads
ATM machines
Touch-screens
Automotive panels
Machine tools
These digital charge-transfer (“QT”) QMatrix™ ICs are designed to detect human touch on up to 16 or 24 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 serial port by 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. They 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 they contain Quantum-pioneered adaptive auto self-calibration, drift compensation, and
digital filtering algorithms that make the sensing function robust and survivable.
These devices feature continuous FMEA self-test and reporting diagnostics, to allow their use in critical consumer appliance
applications, for example ovens and cooktops.
Common PCB materials or flex circuits can be used as the circuit substrate; the overlying panel can be made of any non-conducting
material. External circuitry consists of only a few passive parts. Control and data transfer is via an SPI port.
These devices makes 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.
AVAILABLE OPTIONS
T
A
-40 C to +105
0
C
-40
0
C to +105
0
C
0
# Keys
16
24
Part Number
QT60168-ASG
QT60248-ASG
Lead-Free
Yes
Yes
LQ
Copyright © 2004 QRG Ltd
QT60248-AS R4.02/0405
QUANTUM [ QUANTUM RESEARCH GROUP ]
