LQ
QT60325B, QT60485B, QT60645B
32, 48, 64 KEY QMatrix™ KEYPANEL
S
ENSOR IC
S
ꢀ Advanced second generation QMatrix controllers
ꢀ Up to 32, 48 or 64 touch keys through any dielectric
ꢀ Panel thicknesses to 5 cm or more
34
44 43 42 41 40 39 38 37 36 35
MOSI
MISO
SCLK
RST
Vdd
1
2
3
4
5
6
7
8
9
33
CZ2
YS0
YS1
YS2
Aref
AGnd
AVdd
YC7
YC6
YC5
YC4
ꢀ 100% autocal for life - no adjustments required
ꢀ Keys individually adjustable for sensitivity, response time,
and many other critical parameters
32
31
30
29
28
27
26
25
24
23
QT60325B
QT60485B
QT60645B
ꢀ Mix and match key sizes & shapes in one panel
ꢀ Passive matrix - no components at the keys
ꢀ Moisture suppression capable
Vss
XTO
XTI
TQFP-44
X0
ꢀ AKS™ - Adjacent Key Suppression feature
ꢀ Synchronous noise suppression
ꢀ Sleep mode with wake pin
X1
10
11
X2WS
13 14 15 16 17 18 19 20 21 22
12
ꢀ SPI Slave or Master/Slave interface to a host controller
ꢀ Low overhead communications protocol
ꢀ 44-pin TQFP package
APPLICATIONS
ꢀ Security keypanels
ꢀ Industrial keyboards
ꢀ Appliance controls
ꢀ Outdoor keypads
ꢀ ATM machines
ꢀ Touch-screens
ꢀ Automotive panels
ꢀ Machine tools
The QT60325B, QT60485B, and QT60645B digital charge-transfer (“QT”) QMatrix™ ICs are designed to detect human touch on
up to 32, 48, or 64 keys respectively using a scanned, passive X-Y matrix. It will project the 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 port, for example via Quantum’s QmBtn program. Key setups are stored in an onboard eeprom and do not need to be
reloaded with each power-up.
These ICs 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 the devices contain Quantum-pioneered adaptive self-calibration, drift
compensation, and digital filtering algorithms that make the sensing function robust and survivable. The devices use short dwell
times and Quantum’s patent-pending AKS™ feature to permit operation in wet environments.
The parts use a passive key matrix, dramatically reducing cost over older technologies that require an ASIC for every key. The
key-matrix can be made of standard flex material (e.g. Silver on PET plastic) or ordinary PCB material to save cost.
External circuitry consists of an opamp, R2R ladder-DAC network, a common PLD, a FET switch, and a small number of resistors
and capacitors which can fit into a footprint of roughly 8 sq. cm (1.5 sq. in). Control and data transfer is via a SPI port which can
be configured in either a Slave or Master/Slave mode.
QT60xx5B ICs 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 to provide a high economy of scale.
The B version is identical to the earlier QT60xx5 parts in all respects except that the device exhibits lower signal noise.
QT60xx5B replaces QT60xx5 parts with no circuit changes. After 2003, QT60xx5 devices will no longer be available.
AVAILABLE OPTIONS
TA
TQFP
-400C to +1050C
-400C to +1050C
-400C to +1050C
QT60325B-AS
QT60485B-AS
QT60645B-AS
lQ
Copyright © 2001 Quantum Research Group Ltd
Pat Pend. R1.06/0403
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