lQ
QT60160, QT60240
16
AND
24 K
EY
QM
ATRIX
™ T
OUCH
IC
s
/RST
Y0A
Y2B
SMP
SDA
Y1A
Y2A
SCL
P
RELIMINARY
I
NFORMATION
!
Second generation QMatrix technology
!
Keys individually adjustable for sensitivity, response
time, and many other critical parameters
!
Panel thicknesses to 50mm through any dielectric
!
100% autocal for life - no adjustments required
!
I
2
C slave interface
or
shift register output
!
AKS™ - Patented Adjacent Key Suppression feature
!
Spread-spectrum modulation for high noise immunity
!
Mix and match key sizes and shapes in one panel
!
Low power modes
!
Low external component count
!
Low cost per key
!
+1.8V to +5V single supply operation
!
32-pin RoHS compliant MLF package
M_SYNC
DETECT
VSS
VDD
VSS
VDD
X6
X7
1
2
3
4
5
6
7
8
32 31 30 29 28 27 26 25
24
23
Y1B
Y0B
A0
VSS
VDD
A1
VDD
X5
QT60240
QT60160
MLF-32
22
21
20
19
18
17
9 10 11 12 13 14 15 16
X1
X0
S_SYNC
VREF
LATCH
X4
X3
X2
APPLICATIONS
!
Security keypanels
!
Industrial keyboards
!
Appliance controls
!
Outdoor keypads
!
ATM machines
!
Touchscreens
!
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 5cm or more. The touch areas are defined as simple two-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 pan els, 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.
Common PCB materials or flex circuits can be used as the circuit substrate; the overlying panel can be made of any
nonconducting material. External circuitry consists of only a few passive parts . Control and data transfer is via I
2
C.
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.
AVAILABLE OPTIONS
Part Number
QT60160-XSG
QT60240-XSG
Keys
16
24
T
A
-40 C to +85
0
C
-40
0
C to +85
0
C
0
LQ
Preliminary information; subject to change
Copyright © 2006 QRG Ltd
QT60240-XSG X7.04/0706
QT [ QT OPTOELECTRONICS ]
