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부품번호 QT60161B 기능
기능 16 KEY QMATRIX KEYPANEL SENSOR IC
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QT60161B 데이터시트, 핀배열, 회로
LQ
QT60161B
16 KEY QMatrixKEYPANEL SENSOR IC
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
44 43 42 41 40 39 38 37 36 35 34
1 33
2 32
3 31
4 30
5 QT60161B 29
6 TQFP-44 28
7 27
8 26
9 25
10 24
11 23
12 13 14 15 16 17 18 19 20 21 22
CS2A
CS2B
CS3A
CS3B
Aref
AGnd
AVdd
YS3
YS2
YS1
YS0
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.
lQ
AVAILABLE OPTIONS
TA
-400C to +1050C
TQFP Part Number
QT60161B-AS
Copyright © 2001 Quantum Research Group Ltd
Pat Pend. R1.03/04.03




QT60161B pdf, 반도체, 판매, 대치품
©Quantum Research Group Ltd.
1 Overview
QMatrix devices are digital burst mode charge-transfer (QT)
sensors designed specifically for matrix geometry touch
controls; they include all signal processing functions
necessary to provide stable sensing under a wide variety of
changing conditions. Only a few low cost external parts are
required for operation. The entire circuit can be built in under
6 square centimeters of PCB area.
Figure 1-1 Field flow between X and Y elements
overlying panel
X
element
Y
elem ent
Figure 1-4 Sample Electrode Geometries
PARALLEL LINES
SERPENTINE
SPIRAL
charge driven by the X electrode is partly received onto the
corresponding Y electrode which is then processed. The part
uses 4 'X' edge-driven rows and 4 'Y' sense columns to sense
up to 16 keys.
The charge flows are absorbed by the touch of a human
finger (Figure 1-1) resulting in a decrease in coupling from X
to Y. Thus, received signals decrease or go negative with
respect to the reference level during a touch.
As shown in Figure 1-3, water films cause the coupled fields
to increase slightly, making them easy to distinguish from
touch.
The device has a wide dynamic range that allows for a wide
variety of key sizes and shapes to be mixed together in a
single touch panel. These features permit new types of
keypad features such as touch-sliders, back-illuminated keys,
and complex warped panels.
The devices use an SPI interface running at up to 3MHz rates
to allow key data to be extracted and to permit individual key
parameter setup, or, a UART port which can run at rates to
57.6 Kbaud. The serial interface protocol uses simple
commands; the command structure is designed to minimize
the amount of data traffic while maximizing the amount of
information conveyed.
1.2 Circuit Overview
A basic circuit diagram is shown in Figure 1-5. The Xdrives
are sequentially pulsed in groupings of bursts. At the
intersection of each Xand Yline in the matrix itself, where
a key is desired, should be an interdigitated electrode set
similar to those shown in Figure 1-4. See Quantum App Note
AN-KD01, or consult Quantum for application assistance.
The device uses fixed external capacitors to acquire charge
from the matrix during a burst of charge-transfer cycles; the
burst length can be varied to permit digitally variable key
signal gains. The charge is converted to digital using a
single-slope conversion process.
In addition to normal operating and
setup functions the device can also
report back actual signal strengths
and error codes over the serial
interfaces.
QmBtn software for the PC can be
used to program the IC as well as
read back key status and signal
levels in real time.
A parallel scan port is also provided
that can be used to directly replace
membrane type keypads.
QMatrix technology employs
transverse charge-transfer ('QT')
sensing, a new technology that
senses the changes in an electrical
charge forced across an electrode
set.
1.1 Field Flows
Figure 1-1 shows how charge is
transferred across an electrode set
to permeate the overlying panel
material; this charge flow exhibits a
high dQ/dt during the edge
transitions of the X drive pulse. The
Figure 1-2 Field Flows When Touched
X
element
ov e rly in g pan el
Y
elem ent
Figure 1-3 Fields With a Conductive Film
Burst mode operation permits the
use of a passive matrix, reduces RF
emissions, and provides excellent
response times.
Refer to Section 3 for more details
on circuit operation.
1.3 Communications
The device uses two variants of SPI
communications, Slave-only and
Master-Slave, a UART interface,
plus a parallel scan interface. Over
the serial interfaces are used a
command and data transfer
structure designed for high levels of
flexibility using minimal numbers of
bytes. For more information see
Sections 4 and 5.
The parallel scan port permits the
replacement of electromechanical
keypads that would be scanned by
a microcontroller; the scan interface
mimics an electromechanical
keyboards response.
lQ
4 www.qprox.com QT60161B / R1.03

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QT60161B 전자부품, 판매, 대치품
©Quantum Research Group Ltd.
the suppression of multiple key presses based on relative
signal strengths. AKS assists in solving the problem of
surface water which can bridge a key touch to an adjacent
key, causing multiple key presses, causing multiple key
presses even though only one key was touched. This feature
is also useful for panels with tightly spaced keys, where a
fingertip can partially overlap an adjacent key.
flow using minimal data transfers and low host software
overhead.
3 Circuit Operation
A QT60161B reference circuit is shown in Figure 2-1.
AKS works for keys that are AKS-enabled anywhere in the
matrix and is not restricted to physically adjacent keys; the
device has no knowledge of which keys are physically
adjacent. When enabled for a key, adjacent key suppression
causes detections on that key to be suppressed if any other
AKS-enabled key in the panel has a more negative signal
deviation from its reference.
This feature does not account for varying key gains (burst
length) but ignores the actual negative detection threshold
setting for the key. If AKS-enabled keys in a panel have
different sizes, it may be necessary to reduce the gains of
larger keys relative to smaller ones to equalize the effects of
AKS. The signal threshold of the larger keys can be altered to
compensate for this without causing problems with key
suppression.
3.1 Matrix Scan Sequence
The circuit operates by scanning each key sequentially, key
by key. Key scanning begins with location X=0 / Y=0. X axis
keys are known as rows while Y axis keys are referred to as
columns. Keys are scanned sequentially by row, for example
the sequence Y0X0 Y0X1 Y0X2 Y0X3 Y1X0 etc.
Each key is sampled from 1 to 64 times in a burst whose
length is determined by Setup ^F. A burst is completed
entirely before the next key is sampled; at the end of each
burst the resulting analog signal is converted to digital using a
single-slope conversion process. The length of the burst
directly impacts on the gain of the key; each key can have a
unique burst length in order to allow tailoring of key sensitivity
on a key by key basis.
AKS works to augment the natural moisture suppression
capabilities of the device (Section 3.10), creating a more
robust touch panel.
2.10 Full Recalibration
See also command b, page 24
The part fully recalibrates one or more keys after the b
command has been issued to it, depending on the current
scope of the bcommand. The device recalibrates all keys on
powerup, after a hard reset via the RST pin or on power up,
or via a reset using the rcommand. Since the circuit
tolerates a very wide dynamic signal range, it is capable of
adapting to a wide mix of key sizes and shapes having widely
varying Cx coupling capacitances.
If a false calibration occurs due to a key touch or foreign
object on the keys during powerup, the affected key will
recalibrate again when the object is removed depending on
the settings of Positive Threshold and Positive Recal Delay
(Sections 2.2 and 2.7).
Calibration requires 9 full burst cycles to complete, and so the
time it takes is dependent on the burst spacing parameter
(Section 3.8 also, ^G, page 22.
3.2 Signal Path
Refer to Figures 1-5, 3-1, and 3-2.
X-Drives. The X drives are push-pull CMOS lines which drive
charge through the matrix keys on the positive and negative
edges of X. Only the positive edge of X is used for signal
purposes, however the negative edge must cause the charge
across the keys to neutralize prior to the next positive edge,
else the sampling mechanism will cease after one pulse. The
part accomplishes this by holding all Y lines to ground during
the falling edge of X.
Charge gate. Only one X row is pulsed during a burst.
Charge is coupled across a key's Cx capacitance from the X
row to all Y columns. A particular key is chosen by gating the
charge from a single Y column into a single one of four
possible sampler capacitors. The other three X and three Y
lines are clamped to ground during this process.
Dwell time. The dwell time is determined internally and is
the same as one oscillator period, i.e. 83.3ns with a 12MHz
resonator. The dwell time is set via internal switching action
Figure 3-1 QT60161B Circuit Model
2.11 Device Status & Reporting
See also commands 7, page 19; e, page 19; E, page 20;
k, page 20, K, page 20
The device can report on the general device status or specific
key states including touches and error conditions, depending
on the command used.
X d rive
(1 of 4)
X
X
ele ctrode
Cx
Y
ele ct rode
Usually it is most efficient to periodically request the general
device status using command 7first, as the response to this
command is a single byte which reports back on behalf of all
keys. 7indicates if there are any keys detecting, calibrating,
or in error.
If command 7reports a condition requiring further
investigation, the host device can then use commands e, E,
kor Kto provide further details of the event(s) in progress.
This hierarchical approach provides for a concise information
R e su lt
S ta rt
Do ne
CSA
CSB
Y line (1 of 4)
Cs (1 of 4)
Rs (1 of 4)
SMP
lQ
7 www.qprox.com QT60161B / R1.03

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관련 데이터시트

부품번호상세설명 및 기능제조사
QT60161

16 KEY QMatrix KEYPANEL SENSORS IC

QUANTUM
QUANTUM
QT60161B

16 KEY QMATRIX KEYPANEL SENSOR IC

ETC
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