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PDF QT60485 Datasheet ( Hoja de datos )

Número de pieza QT60485
Descripción (QT60325 - QT60645) QMatrix KEYPANEL SENSOR ICS
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QT60485 datasheet

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QT60485 pdf
© Quantum Research Group Ltd.
Figure 1-5 QT60xx5 Basic Circuit Model
Short sample gate dwell times after the X
edges will limit the effect of moisture
XX ddrriivvee
((11 ooff 88))
XXnn
X
electrode
SSaammpplele
YY lliinnee sswwiittcchh ((11 ooff88))
CCxx ((11 ooff 88))
00
CCaanncceelllalatitoionn
sswwititcchheess
11
Y
e lect rod e
RReesseett sswwiittcchh
00
CCzz11
11
spreading from key to key by taking
advantage of the RC filter-like nature of
continuous films; a short dwell time will limit
the time that the charge has to travel
through the impedance of the film (Section
3.13). This effect is independent of the
frequency of burst repetition, intra-burst
pulse spacing, or X drive pulse width.
Burst mode operation permits reduced
To 60xxx AD C
CCss
CChhaarrggee
InInteteggrraat toorr
CCaa CCzz22
XXnn
power consumption and reduces RF
emissions, while permitting excellent
response time.
A mmpp
RReesseet t
sswwitictchh
1.3 Matrix Configuration
From 60xxx
O ffset Control
88--bbiitt
Offffsseett DDAACC
SSaammpplele
sswwitictchh
AAmmpp
oouut t
00
The matrix scanning configuration is shown
in Figure 1-5. The Xdrives are sequentially
pulsed in groupings of bursts; an 8:1 analog
VVouotut mux acts as the sample switch for all Y
lines. At the intersection of each Xand Y
absolute signals yet still respond to very small signal
changes. Subranging is provided by two offset mechanisms
which can be thought of as 'coarse' and 'fine' offsets.
line in the matrix itself, where a key is
desired, should be an interdigitated electrode set similar to
those shown in Figure 1-2. The outermost electrode or the
key border should always be connected to an Xdrive;
The 'coarse' method uses one or two switched Cz capacitors flooding the area around keys with X fill to a width of up to
to subtract charge from the charge integrator to create up to 10mm can help in suppressing moisture films further.
two step offsets, to bring the analog signal back to a more
reasonable level. This action occurs during the course of the
burst.
Although it is referred to as a ‘matrix’, there is no restriction
on where individual keys can be located. The term ‘matrix’
refers to the electrical configuration of keys, not the physical
The 'fine' method of offset uses an 8-bit R2R ladder DAC
arrangement. Consult Quantum for application assistance on
driven by the X drive lines to create an offset in the amplifier key design.
stage. The DAC is driven after the burst has ceased and the
charge accumulated, so there is no conflict in this dual-use of 1.4 Communications
the X lines.
The device uses two variants of SPI communications,
Slave-only and Master-Slave. Over this interface is a
command and data transfer structure
Figure 1-6 Circuit Block Diagram (8x8 Matrix Shown)
designed for high levels of flexibility using
SP I
to
Host
X0
X1
X2
X3
X4
X5
X6
X7
X{1. .7 }
XS
YC0 .
YC1 .
YC2 .
YC3 .
YC4 .
YC5 .
YC6 .
YC7 .
X7
Timin g &
Ch arge
Neutralizin g
C ontrol
(PL D)
Transfer S trobe
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
X0
X1
X2
X3
X4
X5
X6
X7
minimal numbers of bytes. For more
information see Sections 4 and 5.
Device variations: Refer to Section 3.1 for
differences between the parts covered by
this datasheet.
2 Signal Processing
The devices calibrate and process all
signals using a number of algorithms
specifically designed to provide for high
survivability in the face of adverse
environmental challenges. They provide a
Y S0. .Y S2
Q T6 0xx 5
AIN
X0 .
X1 .
X2 .
X3 .
X4 .
X5 .
X6 .
XS .
Transfer S elect
R2R
DAC
Signal Offset
G ain
Amp
C harge
I n te g ra t o r
T ra n s fe r
M ux
+
large number of processing options which
can be user-selected to implement very
flexible, robust keypanel solutions.
2.1 Negative Threshold
See also command ^A, page 24
- The negative threshold value is established
Integrator R eset
CSR
C harge C ancellation 1
Cz1 C harge C ancellation 2
C z2
C Z1
C Z2
relative to a keys signal reference value.
The threshold is used to determine key
touch when crossed by a negative-going
signal swing after having been filtered by
lQ
5 www.qprox.com QT60xx5 / R1.05

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QT60485 arduino
© Quantum Research Group Ltd.
lQ
11 www.qprox.com QT60xx5 / R1.05

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