LQ
16 K
EY
QMatrix
™
K
EYPANEL
S
ENSOR
IC
DRDY
VREF
CS0B
CS0A
Vdd
CS1B
CS1A
LED
Vss
SO
SS
44 43 42 41 40 39 38 37 36 35 34
33
32
31
30
29
28
27
26
25
QT60161B
Advanced second generation QMatrix controller
16 touch keys through any dielectric
100% autocal for life - no adjustments required
SPI Slave or Master/Slave interface to a host controller
Parallel scan interface for electromechanical compatibility
Keys individually adjustable for sensitivity, response time,
and many other critical parameters
Sleep mode with wake pin
Synchronous noise suppression
Mix and match key sizes & shapes in one panel
Adjacent key suppression feature
Panel thicknesses to 5 cm or more
Low overhead communications protocol
44-pin TQFP package
MOSI
MISO
SCK
RST
Vdd
Vss
XTO
XTI
RX
TX
WS
1
2
3
4
5
6
7
8
9
CS2A
CS2B
CS3A
CS3B
Aref
AGnd
AVdd
YS3
YS2
YS1
YS0
QT60161B
TQFP-44
10
24
11
23
12 13 14 15 16 17 18 19 20 21 22
SMP
X2
X1OPB
X0OPA
X3
Vdd
XS1
XS0
Vss
XS3
XS2
APPLICATIONS -
Security keypanels
Industrial keyboards
Appliance controls
Outdoor keypads
ATM machines
Touch-screens
Automotive panels
Machine tools
The QT60161B digital charge-transfer (“QT”) QMatrix™ IC is designed to detect human touch on up 16 keys when used in
conjunction with 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 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.
The device is 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 part can scan matrix touch keys over LCD panels or other displays when used with clear ITO electrodes arranged in a matrix.
It does 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 capacitors and resistors, all of which can fit into a footprint of less than 6 sq. cm
(1 sq. in). Control and data transfer is via either a SPI or UART port; a parallel scan port provides backwards compatibility with
scanned electromechanical keys.
The QT60161B 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 some older technologies it does not require one sensing IC per key.
The QT60161B is identical to earlier QT60161 in all respects except that the device exhibits lower signal noise. This
device replaces QT60161 parts directly. After December 2003 the QT60161 will no longer be sold.
AVAILABLE OPTIONS
T
A
-40 C to +105
0
C
0
TQFP Part Number
QT60161B-AS
lQ
Copyright © 2001 Quantum Research Group Ltd
Pat Pend. R1.03/04.03
ETC [ ETC ]
