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PDF QT60320D Data sheet ( Hoja de datos )

Número de pieza QT60320D
Descripción 32-KEY QMATRIX CHARGE-TRANSFER IC
Fabricantes QUANTUM 
Logotipo QUANTUM Logotipo



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LQ
QT60320D
32-KEY QMATRIX™ CHARGE-TRANSFER IC
Creates 32 ‘touch buttons’ through any dielectric
100% autocal for life - no adjustments required
'N' key rollover: senses all 32 keys in parallel
Keys individually adjustable for sensitivity
Mix 'n match key sizes & shapes in one panel
Tolerates a 20:1 variance in key sizes on a panel
Panel thicknesses to 5 cm or more
Back lit keys possible with ITO electrodes
LED status function drives
User-addressable multifunction drive pins
User-addressable internal eeprom
Simple, universal serial interface
5V single supply operation
44-pin TQFP package
One square inch (6.5 square cm) of PCB required
X6
X7
X8
RST
Vcc
Gnd
XT2
XT1
RX
TX
O1
144
43
42
41
40
39
38
37
36
35
34
33
2 32
3 31
4 30
5
6
QT60320
29
28
7 27
8 26
9 25
10 24
11 23
12 13 14 15 16 17 18 19 20 21 22
I1
CC1
CC2
CS
Aref
AGnd
Vcc
O8
O7
O6
O5
APPLICATIONS -
Security keypanels
Industrial keyboards
Appliance controls
Outdoor keypads
ATM machines
Touch-screens
Automotive panels
Machine tools
The QT60320D digital charge-transfer (“QT”) QMatrix™ IC is designed to detect touch on up to 32 keys in a scanned X-Y matrix. It will
project the keys through almost any dielectric, like glass, plastic, stone, ceramic, and even most kinds of 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,
Indium-Tin-Oxide (ITO), or screened silver or carbon deposited on the rear of the 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 or more
in area. The gain (sensitivity) and threshold of each key can be set individually via simple commands over the UART port, for example
via the freeware QmBtn program. Key setups are stored internally in an onboard eeprom and do not need to be reloaded.
The IC is designed specifically to work with appliances, ATM machines, security panels, portable instruments, machine tools, or
similar products that are subject to environmental 'challenges' or even physical attack. It permits the construction of 100% sealed,
watertight keypanels that are immune to environmental factors such as humidity and condensation, temperature, dirt accumulation, or
the physical deterioration of the panel surface from abrasion, chemicals, or abuse. To this end the QT60320D contains
Quantum-pioneered self-calibration, drift compensation, and digital filtering algorithms that make the sensing function extremely
robust and survivable.
The device can readily control keys over graphical LCD panels or LEDs when used with clear, conductive ITO electrodes. It does not
require 'chip on glass' or other exotic fabrication techniques, thus allowing the OEM to source the keymatrix from multiple vendors.
External circuitry consists of an opamp, a common PLD, and a quad fet switch, which can fit into a footprint of roughly 1 square inch
(6.5 sq. cm). The device also can control two status LEDs, and includes in addition 8 addressable output drive lines and 4 readable
spare input lines which can be used to control LEDs, LCDs, or other panel functions without requiring additional control lines from the
host CPU. It also makes available to the user 86 bytes of onboard writeable and readable eeprom via the serial interface, thus helping
to reduce system cost by eliminating extra components.
QT60320D technology makes use of an important new variant of charge-transfer sensing, transverse charge-transfer, in an XY format
that minimizes the number of required scan lines. Unlike older technologies it does not require one IC per key, and is cost competitive
even with some membrane technologies. In many cases it can also replace resistive XY sense elements commonly used in touch
screens, at a fraction of the price.
The QT60320D is an improved version of the QT60320C, having lower noise and wider temperature range than the original
part. Prior silicon versions will not be available after December 2003.
LQ
AVAILABLE OPTIONS
TA
-400C to +1050C
TQFP
QT60320D-AS
Copyright © 1999, 2001 Quantum Research Group Ltd
QT60320D R1.11/12.07.03

1 page




QT60320D pdf
2 - CIRCUIT
Figure 2-1 Basic QT60320D Circuit
SPECIFICS
V cc
A basic QT60320D circuit is
shown in Figure 2-1.
2.1 SIGNAL PATH
The QT60320D requires an
external sampling capacitor,
two Cz capacitors, an amplifier,
some analog switches, and an
R2R ladder DAC to operate.
The Cs capacitor performs the
charge integration function by
collecting charge coupled
though a selected key during
the dV/dt of the rising edge of
an 'X' scan line. The charge is
sampled 'n' times during the
course of a burst of switching
cycles of length 'n'. As the
burst progresses the charge on
Cs increases in a staircase
fashion (Figure 1-4).
At the burst's end the voltage
D S 18 11
UART IN
UART OUT
5 17 27 29 38
V V V VV
4 Rst
9
10 Rx
Tx
33
I1
34 I2
35
36 I3
I4
X1 40
41
X2 42
X3 43
X4
X5 44
1
X6 2
X7
X8 3
11
12 O1
O2
13 O3
14 O4
23
24 O5
O6
25
O7
26 O8
8
XT1
7
XT2
8MHz
V cc
CAL LED
15
L1
16
L2
R2R dac 100K
19
YS1
YS2 20
21
YS3
YS4 22
C6 (Cz1) 820pF
32
CC1
C7 (Cz2) 820pF
31
CC2
CS 30
BSN20
37
AIN
+
_
R3 68K
_
+
TL C22 72
STAT LED
GGGG
6 18 28 39
R6 10K
R4 100K
Keymatrix
Y4 Y3 Y2 Y1
R5 10K
C5 (Cs)
1 5nF
74 AC 04
on Cs, which is on the order of
a few tenths of a volt, is
amplified by a gain circuit which includes an offset current between 0 and 5 volts. Between bursts the Cs reset mosfet is
from the R2R ladder DAC driven by the X drive lines. The activated to reset the Cs capacitor to ground.
offset current from the R2R ladder repositions the output of Gain is directly controlled by burst length 'n', amplifier gain
the amplifier chain to coincide as closely as possible with the Av, and the values of Cs, Cz1 and Cz2. Only 'n' can be
center span of the 60320's ADC, which can convert voltages adjusted on a key by key basis whereas Av and the
capacitances can only be adjusted
Figure 2-2 Improved Circuit to Suppress Water Films
for all keys. The amplifier should
typically have a total positive gain
Vcc
D S 18 11
UART IN
UART OUT
5 17 27 29 38
V V V VV
4
R st
9 Rx
10
Tx
33 I1
34
35 I2
I3
36
I4
40
X2 41
X3 42
43
X4 44
X5 1
X6
X7 2
3
X8
11
12 O1
O2
13 O3
14
O4
23
24 O5
25 O6
O7
26 O8
8 XT1
R2R dac 100K
19
YS1
YS2 20
21
YS3
22
YS4
C6 (Cz1) 820pF
CC 1 32
C 7 (Cz2) 820p F
7
XT2
8MH z
Vcc
CAL L ED
15 L1
16 L2
31
CC 2
30
CS
AIN 37
BS N 20
+
_
STAT LED
GGGG
6 18 28 39
22V10
R3 68K
_
+
TLC2272
R6 10K
Keym atr ix
Y4 Y3 Y2 Y1
E I /O
E
E
E I /O
I/O I /O
QS3125
I/O I /O
Ct
Rt
I/O
I/O
R5 1 0K
C5 (Cs)
15nF
of 100 +/- 20%..
If there is a large amount of
coupling between X and Y lines,
and where burst length 'n' is set to
a high number, charge
accumulation on Cs may reach a
point where the ladder DAC can no
longer offset the signal back into
the ADC's usable range. In this
case the circuit will employ one or
two of the Cz capacitors to 'knock
back' or cancel the charge
accumulated on Cs; each Cz will
cancel charge in a discrete step as
required.
R4 100K
LQ
5 QT60320D R1.11/12.07.03

5 Page





QT60320D arduino
6 E6S3 BOARD SCHEMATIC
LQ
11 QT60320D R1.11/12.07.03

11 Page







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