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PDF QT60320C Data sheet ( Hoja de datos )

Número de pieza QT60320C
Descripción 32-KEY QMATRIX CHARGE-TRANSFER IC
Fabricantes QUANTUM 
Logotipo QUANTUM Logotipo



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No Preview Available ! QT60320C Hoja de datos, Descripción, Manual

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LQ
NOT RECOMMENDED FOR NEW DESIGNS
QT60320C
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 QT60320 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 QT60320 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.
QT60320 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.
This part is not recommended for new designs. Consult Quantum for advice on alternatives.
AVAILABLE OPTIONS
TA
-400C to +1050C
TQFP
QT60320C-AS
LQ
Copyright © 1999, 2001 Quantum Research Group Ltd
QT60320C R1.08/01.03

1 page




QT60320C pdf
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
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 from the R2R ladder
DAC driven by the X drive
lines. The offset current from
the R2R ladder repositions the
output of the amplifier chain to
coincide as closely as possible
with the center span of the
60320's ADC, which can
convert voltages between 0
and 5 volts. Between bursts the
Cs reset mosfet is activated to
reset the Cs capacitor to
ground.
Figure 2-1 Basic QT60320 Circuit
V cc
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
Gain is directly controlled by
burst length 'n', amplifier gain
Av, and the values of Cs, Cz1 and Cz2. Only 'n' can be
adjusted on a key by key basis whereas Av and the
capacitances can only be adjusted for all keys. The amplifier
should typically have a total positive gain 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
Figure 2-2 Improved Circuit to Suppress Water Films
in a discrete step as required.
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
7
XT2
8MH z
Vcc
CAL L ED
15 L1
16 L2
R2R dac 100K
19
YS1
YS2 20
21
YS3
22
YS4
C6 (Cz1) 820pF
CC 1 32
C 7 (Cz2) 820p F
31
CC 2
30
CS
BS N 20
AIN 37
+
_
22V10
R3 68K
_
+
TLC2272
STAT LED
GGGG
6 18 28 39
R6 10K
R4 100K
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
Components shown in Figure 2-1
include:
An LVD reset (e.g. Dallas
DS1811) suitable for 5 volt
supplies and an active-low on
low-voltage output;
An R2R ladder network (CTS
750-107R100K or equivalent);
A >2MHz GBW CMOS rail-rail
output opamp capable of
sensing ground on the inputs;
An 8MHz crystal or resonator,
or a ceramic resonator with
built-in capacitors;
Two indicator LEDs (optional)
to show sensing state and
calibration status;
74AC04 inverters to drive the
two banks of analog switches
in opposite states;
Two 74HC4066 analog
switches;
A reset mosfet, most any
small-signal mosfet with a
guaranteed on-state at 4 volts
LQ 5 QT60320C R1.08/01.03

5 Page





QT60320C arduino
6 E6S3 BOARD SCHEMATIC
LQ 11 QT60320C R1.08/01.03

11 Page







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