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부품번호 QT60485B 기능
기능 (QT60325B - QT60645B) QMatrix KEYPANEL SENSOR ICS
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QT60485B 데이터시트, 핀배열, 회로
www.DataSheet4U.com
LQ
QT60325B, QT60485B, QT60645B
32, 48, 64 KEY QMatrixKEYPANEL SENSOR ICS
Advanced second generation QMatrix controllers
Up to 32, 48 or 64 touch keys through any dielectric
Panel thicknesses to 5 cm or more
100% autocal for life - no adjustments required
Keys individually adjustable for sensitivity, response time,
and many other critical parameters
Mix and match key sizes & shapes in one panel
Passive matrix - no components at the keys
Moisture suppression capable
AKS™ - Adjacent Key Suppression feature
Synchronous noise suppression
Sleep mode with wake pin
SPI Slave or Master/Slave interface to a host controller
Low overhead communications protocol
44-pin TQFP package
MOSI
MISO
SCLK
RST
Vdd
Vss
XTO
XTI
X0
X1
X2WS
44 43 42 41 40 39 38 37 36 35 34
1 33
2 32
3 31
4 QT60325B 30
5 QT60485B 29
6 QT60645B 28
7 27
8
9
TQFP-44
26
25
10 24
11 23
12 13 14 15 16 17 18 19 20 21 22
CZ2
YS0
YS1
YS2
Aref
AGnd
AVdd
YC7
YC6
YC5
YC4
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.
lQ
AVAILABLE OPTIONS
TA
-400C to +1050C
-400C to +1050C
-400C to +1050C
TQFP
QT60325B-AS
QT60485B-AS
QT60645B-AS
Copyright © 2001 Quantum Research Group Ltd
Pat Pend. R1.06/0403




QT60485B 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 external parts are required
for operation. The entire circuit can be built within 8 square
centimeters of PCB area.
Figure 1-2 Sample Electrode Geometries
Figure 1-1 Field flow between X and Y elements
overlying panel
X
element
Y
elem ent
PARALLEL LINES
SERPENTINE
SPIRAL
edge transitions of the X drive pulse. The charge emitted by
the X electrode is partly received onto the corresponding Y
electrode which is then processed. The parts use 8 'X'
edge-driven rows and 8 'Y' sense columns to permit up to 64
keys. Keys are typically formed from interleaved conductive
traces on a substrate like a flex circuit or PCB (Figure 1-2).
The charge flows are absorbed by the touch of a human
finger (Figure 1-3) 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.
Water films cause the coupled fields to increase slightly,
making water films easy to distinguish from touch.
QMatrix devices include charge cancellation methods which
allow for a wide range of key sizes and shapes to be mixed 1.2 Circuit Model
together in a single touch panel. These features permit the An electrical circuit model is shown in Figure 1-5. The
construction of entirely new classes of keypads never before coupling capacitance between X and Y electrodes is
contemplated, such as touch-sliders, back-illuminated keys, represented by Cx. While the reset switch is open, a sample
and complex warped panel shapes, all at very low cost.
switch is gated so that it transfers charge flows only from the
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and setup functions the device
integrator output voltage due to
can also report back actual
touch during an acquire (Section
signal strengths and error codes.
3.6) to increase gain.
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.
QMatrix parts employ transverse
charge-transfer ('QT') sensing, a
new technology that senses
changes in the charge forced
across an electrode by a digital
edge.
The parts are electrically
identical with the exception of the
number of keys which may be
sensed.
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
X
element
ov e rly in g pan el
Y
elem ent
Figure 1-4 Fields With a Conductive Film
The charge detector is an opamp
configured as an integrator with a
reset switch; this creates a virtual
ground input, making the Y lines
appear low impedance when the
sample switch is closed. This
configuration effectively
eliminates cross-coupling among
Y lines while greatly lowering
susceptibility to EMI. The circuit
is also highly immune to
capacitive loading on the Y lines,
since stray C from Y to ground
appears merely as a small
parallel capacitance across a
virtual ground.
The circuit uses an 8-bit ADC,
with a subranging structure to
effectively deliver a 14-bit total
conversion 'space' (see Figure
1-6 and Section 3.3). In this way
the circuit can tolerate very large
lQ
4 www.qprox.com QT60xx5B / R1.06

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QT60485B 전자부품, 판매, 대치품
© Quantum Research Group Ltd.
o accomplish. Only a full recalibration via a reset or a
recalibration command will perform a complete recalibration
involving both the R2R Offset and Cz capacitors (Section
2.10).
After a fast recalibration has taken place, the affected key will
once again function normally even if it is still being contacted
by the foreign object. This feature is set on a per-key basis
using Setup ^L. It can be disabled if desired by setting this
parameter to zero, so that it will not recalibrate automatically.
2.6 Detect Integrator (DI)
See also command ^J, page 26
To suppress false detections caused by spurious events like
electrical noise, the QT60xx5B incorporates a 'detection
integrator' or DI counter that increments with each sample
where the signal passes below the negative threshold, until a
user-defined DI limit is reached, at which point the detection
is confirmed and the corresponding detect bit is set.
If before the DI limit is reached, the signal rises to a point
between the hysteresis and threshold levels, the DI counter is
decremented with each such sample to a limit of zero.
If before the DI limit is reached, the signal rises above the
hysteresis level, the DI counter is immediately cleared.
When an active key is released, the DI must count down to
zero before the key state is cleared. Clearing a keys DI limit
disables that key although the bursts for that key continue.
The DI is extremely effective at reducing false detections at
the expense of slower reaction times. In some applications a
slow reaction time is desirable; the DI can be used to
intentionally slow down touch response in order to require the
user to touch longer to operate the key.
There are 16 possible values for the DI limit.
2.7 Positive Recalibration Delay
See also command ^K, page 26
A recalibration can occur automatically if the signal swings
more positive than the positive threshold level. This condition
can occur if there is positive drift but insufficient positive drift
compensation, or if the reference moved negative due to a
recalibration, and thereafter the signal returned to normal.
As an example of the latter, if a foreign object or a finger
contacts a key for period longer than the Negative Recal
Delay, the key is by recalibrated to a new lower reference
level. Then, when the condition causing the negative swing
ceases to exist (e.g. the object is removed) the signal can
suddenly swing back positive to near its normal reference.
It is almost always desirable in these cases to cause the key
to recalibrate to the new signal level so as to restore normal
touch operation. The device accomplishes this by simply
setting Reference = Signal.
The time required to detect this condition before recalibrating
is governed by the Positive Recalibration Delay command. In
order for this feature to operate, the signal must rise through
the positive threshold level (Section 2.2) for the proscribed
user-set interval determined by ^K.
After the Positive Recal Delay interval has expired and the
fast-recalibration has taken place, the affected key will once
again function normally. This interval can be set on a per-key
basis; it can also be disabled by setting ^K to zero.
2.8 Reference Guardbanding
See also commands ^N, ^O, page 27; L, page 28
QT60xx5B devices provide for a method of self-checking that
allows the host device to ascertain whether one or more key
reference levels are 'out of spec'. This feature can be used to
determine if an X or Y line has broken, the matrix panel has
delaminated from the control panel, or there is a circuit fault.
Guardbanding alerts the host controller when the reference
level of a key falls outside of acceptable absolute levels. The
guardband is expressed in percent of absolute reference from
the reference level of each individual key. The normal
reference levels can be locked into internal eeprom via the
Lock command 'L' during production; deviations in references
that fall outside the guardbands centered on these reference
levels are then reported as errors.
The calculations required for guardbanding are performed
after the device has recalibrated or been reset after the L
command.
Positive excursion guarding is treated separately from
negative excursion guarding. The possible negative settings
are from 1% to 99% of absolute signal reference in steps of
1% as set by command ^O. Positive excursions can run from
10% to 1,000% in steps of 10% as set by command ^N. A
setting of 0 disables the corresponding guardband direction.
Since the circuit uses a segmented ADC approach with a
'coarse' (based on Cz states) and 'fine' (based on R2R ladder
drive) offsets, the determination of percentage reference
deviation from 'normal' presents a problem. The contributions
of the Cz caps and the R2R ladder must be factored into the
determination in order to make an accurate assessment of
the error band. There are three commands which set
coefficients used to convert the Cz and DAC offset values to
'absolute signal' values, according to the following equation,
for each key:
TotalRef(k) = (C1 x nCz) + (C2 x Offset) + SigRef
Where -
TotalRef(k) is the equivalent absolute reference for key k;
C1 is a global constant set by commands ^T and ^U;
C2 is a global constant set by command ^V;
nCz is the number of Cz caps switched in for key k;
Offset is the noted value of the R2R DAC for key k;
SigRef is the noted current 'window reference' for key k.
The percent deviations are computed in relation to
TotalRef(k) on a per-key basis at the time the 'L' command is
executed. Once the L command has recorded all values of
relating to TotalRef into eeprom, the part will compare the
actual running reference level of each key to its
corresponding computed TotalRef value to see if it falls
outside the guardbands specified by global parameters ^N
and ^O.
Values which correspond to the reference circuit of Figure 3-1
are:
C1 = 1513; ^T value = 0x05, ^U value = 0xE9
C2 = 8; ^V value = 0x08
Guardbanding tests should not be confused with Reference
Boundary errors (Section 2.11). Guardbanding can report
errors that occur even if the signal is properly centered in the
ADC window, while Reference Boundary error reporting
cannot. Guardband tests do however require that the key
lQ
7 www.qprox.com QT60xx5B / R1.06

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(QT60325 - QT60645) QMatrix KEYPANEL SENSOR ICS

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(QT60325B - QT60645B) QMatrix KEYPANEL SENSOR ICS

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