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QT60040

型号：

QT60040

描述：

4 - KEY电荷转移IC[ 4-KEY CHARGE-TRANSFER IC ]

品牌：

QUANTUM[ QUANTUM RESEARCH GROUP ]

页数：

10 页

PDF大小：

296 K

下载PDF手册
LQ  
QT60040  
4-KEY  
CHARGE-TRANSFER IC  
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
Creates 4 ‘touch buttons’ through any dielectric  
Only 1 inexpensive capacitor required  
VDD  
1
2
3
4
5
6
7
14  
13  
12  
11  
10  
9
GND  
X2  
X3  
X4  
Y
Simple 4x1 matrix key geometry  
X1  
OPT1  
OPT2  
Q1  
100% drift compensation for lifetime reliability  
'2' key rollover: senses any 2 keys at same time  
ꢀ Back-lit keys possible with ITO electrodes  
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
Simple direct 'per key' active-high drive outputs  
Auto recalibration after 10 or 60 seconds of touch  
2.5 - 5.5V single power supply operation  
CMOS design - very low power consumption  
14-pin SOIC package  
Q2  
CS  
Q4  
Q3  
8
E604 Evaluation reference design board available  
APPLICATIONS -  
ꢁSecurity keypanels  
ꢁAppliance controls  
ꢁATM machines  
ꢁAutomotive controls  
ꢁIndustrial keyboards  
ꢁVandal-proof keypads  
ꢁTouch-screens  
ꢁPC / peripheral controls  
The QT60040 digital charge-transfer (“QT”) QMatrix™ IC is designed to detect touch on up to 4 keys in a scanned 4x1 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 6mm. 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 a control panel. Alternatively the keys  
can be implemented on a stick-on flex circuit that can be adhered to the rear of most panels.  
The IC is designed specifically for domestic appliances, computer and peripheral control buttons, ATM machines, security  
panels, portable instruments, machine tools, or similar products that are subject to environmental challenges or 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. The QT60040 contains Quantum-pioneered self-calibration, drift compensation, and digital filtering  
algorithms that make its sensing function extremely robust and survivable.  
The device can easily 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 only of a single, inexpensive capacitor. The sensitivity of the keys can be set by simply changing  
the value of this capacitor. The device has 4 outputs which indicate detection on the keys; up to 2 keys can be sensed at any  
one time.  
The QT60040 features automatic recalibration timeouts which will cause the device to recalibrate keys on an individual basis  
when they are 'stuck on' for intervals of either 10s or 60s, depending on a jumper option.  
QT60040 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 and external components. Unlike older technologies it does not  
require one IC per key, and is cost competitive even with some rubber membrane technologies. A distinct advantage is an  
accelerated time to market due to the fact that custom molded membranes are not required; the entire system can be  
designed using common PCB materials.  
The E604 board available from Quantum is a reference design that permits full evaluation of the QT60040  
AVAILABLE OPTIONS  
TA  
0 C to +70 C  
0
-40 C to +85 C  
SOIC  
DIP  
0
0
-
QT60040-D  
0
QT60040-IS  
-
lQ  
Copyright © 2000 Quantum Research Group Ltd  
QT60040 / R1.04 / 0303  
©Quantum Research Group Ltd.  
1.2 CIRCUIT MODEL  
1 - OVERVIEW  
An electrical circuit model is shown in Figure 1-4. The coupling  
capacitance across the X and Y electrodes and from each to a  
finger is represented by Cx1, Cx2a, and Cx2b. The sampling  
capacitor Cs is used to accumulate charge during the course of a  
burst. An important parasitic capacitance from the Y line to  
ground, Cx3, is also shown.  
The QT60040 is a CMOS charge-transfer (QT) sensor designed  
specifically for matrix touch controls; it includes all signal  
processing functions necessary to provide stable sensing under a  
wide variety of changing conditions. Only one low cost external  
capacitor is required for operation.  
The QT60040 uses burst-mode charge transfer methods  
pioneered and patented by Quantum. This revolutionary new  
technology allows the construction of entirely new forms of  
QT switch timing action is shown in Figure 1-5.  
Initially, switch S3 is closed to reset Cs then re-opened. After S3  
is opened, S1 is closed to charge the capacitances associated  
with the Y-line, including all Y-to-X capacitances. After S1 is  
closed, one of the four X lines is raised high, so that there is then  
a zero differential potential from the selected X line to the Y line.  
Then, S1 is opened and S2 is closed, causing charge to flow  
from the Cx capacitances into Cs; Cs charges up slightly with the  
polarity shown. Then the selected X line is driven low, causing a  
step-function decrease in charge on Cs whose magnitude is  
proportionate to the amount of coupling from X to Y.  
Figure 1-1 Field flow between X and Y elements  
overlying panel  
The final charge accumulated on Cs per QT cycle is thus a direct  
function of Cx3 minus the small amount of charge subtracted via  
the Cx1 / Cx2a / Cx2b / Cfinger network. Since the charge from  
the Cx2a / Cx2b network is highly dependent on Cfinger, which  
effectively forms a capacitive divider, the total charge absorbed  
by Cs is dependent on touch: a touch nets more charge  
transferred into Cs per QT cycle because less charge is  
transferred out of Cs per QT cycle.  
X
Y
element  
element  
cmos  
driver  
The acquisition process is controlled by a state machine which  
a burst, which finally  
continues the acquisition cycle as  
terminates when the voltage across Cs reaches the predefined  
level Vref. This burst takes hundreds or even thousands of cycles  
keypanels which can include back-illumination, arbitrary shapes  
of keys, 'morphed' keys wrapped onto complex surfaces, and  
keys having unique textures and feel, all at very low cost.  
The QT60040 uses a 4x1 matrix, having 4 'X' drive lines and 1 'Y'  
receive line. This configuration reduces interconnect  
requirements and also lowers the external component count to  
one charge sampling capacitor which is sequentially shared by  
the four keys.  
Figure 1-2 Field Flows When Touched  
The QT60040 has four simple active-high CMOS outputs that go  
high when the corresponding key is touched. Up to 2 keys can be  
touched at the same time; three or more keys touched will limit to  
the first two touch outputs. An option pin allows this to be  
restricted to only one key if desired.  
The device operates on a 2.5 to 5.5 regulated power supply  
which can be from a common 78L05-type IC regulator or a simple  
2-stage zener regulator supply.  
overlying panel  
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 rapid dQ/dt during the edge transitions of the X drive  
pulse. The charge emitted by the X electrode is partly received  
onto the Y electrode which is then captured by the Cs capacitor  
and processed.  
X
Y
element  
element  
cmos  
driver  
The QT60040 matrix uses 4 'X' edge-driven rows and 1 'Y' sense  
column to detect 4 keys. The X drive occurs as a burst of pulses  
on each key.  
Figure 1-3 Fields With a Conductive Film  
Water film  
The charge flows set into motion by the X drive signals are  
partially absorbed by the touch of a human finger (Figure 1-2)  
resulting in a decrease in coupling from X to Y; coupled charge  
increases in the presence of a conductive film like water (Figure  
1-3) which acts to bridge the two elements. Increasing signals  
due to water films are quite easy to discern and are not detected  
by the QT60040.  
lQ  
- 2 -  
QT60040 / R1.04 / 0303  
©Quantum Research Group Ltd.  
Figure 1-4 QT60040 Circuit Model  
Figure 1-6 Conversion to Single Electrodes  
QT60040  
CX 2A  
CFIN G E R  
CFINGER  
X1  
X2  
X3  
X4  
C
X2A  
C
X2B  
C
S
+
-
Xn  
CX1  
CX3  
DRIVE  
S3  
RESET  
CX 2 B  
Vref  
Y
S1  
C
C
S2  
TRANSFER  
CHARGE  
S
capacitances, possibly by using intentional mutual capacitive  
coupling of tracks on a PCB; traces from the intersections of  
these capacitors are led to solid touch pads which are  
implemented as metallizations on the rear of a control panel.  
Touching the front of the panel has the same absorptive effect on  
signal strength as an interdigitated electrode set.  
1 OF 4  
STATE  
MACHINE  
DONE  
START RESULT  
POST  
The values of Cx2a and Cx2b should be consistent among all  
keys to preserve signal balance, which is required for proper  
operation. The surface area and geometry of this type of  
electrode should be adjusted to suit the desired activation area.  
PROCESSOR  
OUT  
OPTIONS  
Typical values of Cx2a and Cx2b range from 5pF to 10pF. The  
traces leading from the junctions of these capacitors to the solid  
touch pads should not see a load of more than 10pF, thus the  
traces to these pads should be thin and short and not  
accompanied by a ground plane or other traces.  
Figure 1-5 Circuit Switch Timings  
X DRIV E Xn  
CHARGE S 1  
TRANSFER S 2  
RE SET S 3  
1.4 INTERDIGITATED ELECTRODES  
Key electrodes can be made using interdigitated sets of fingers,  
serpentines, spirals or similar patterns (Figure 1-7). One element  
of each key must be connected to an X line, with the other  
connected to the common Y line. The pattern surface area should  
be similar from key to key to preserve relative key sensitivities.  
V
REF  
∆
VCS  
It is important to prevent substantial capacitive coupling from a  
‘bare’ Y line to a finger. A transient increase in Cx3 will cause a  
sudden disturbance common to all keys that can create  
unintentional detections. The connecting Y trace running between  
the keys should be as thin as possible, on a side of the flex circuit  
or pcb away from the user panel, and where possible run closely  
in parallel with a segment of a nearby X trace so as to suppress  
this effect. The problem of a bare Y line can be demonstrated by  
touching the Cs capacitor (which is connected to Y), which will  
cause one or two random keys to activate with each touch.  
Cycle  
1
Cycle 'm'  
to complete; the burst length depends on the value of Cs, the Cx  
capacitances, and Cfinger. Increasing Cs increases the burst  
length, increasing Cx3 decreases burst length, and increasing  
Cx1 and Cx2 increase burst length. Increasing Cfinger decreases  
the burst length. The value of the burst length is thus a variable  
that is dependent on these capacitances; the burst length is used  
to create an internal reference signal level during a calibration  
cycle, and to determine the presence of touch by virtue of a  
change in the burst length relative to the reference level.  
In cases where it is not possible to have both the X and Y traces  
on the same plane, the X traces should be run on the ‘finger’ side  
of the board. In all cases where the X and Y lines run on opposite  
planes, the substrate (a flex circuit, or a pcb) should be as thin as  
Because the Cs capacitor is shared among all four channels it is  
important that the four interdigitated key designs be reasonably  
well matched. It is also important to keep Cx1 and Cx3 to a  
minimum while maximizing the values of Cx2a and Cx2b through  
good key design methods. These requirements also dictate that  
the IC be placed close to the keys to achieve good sensitivity  
levels; long Y traces also increase the risk of susceptibility to  
interference, as well as low gain. To reduce Cx3, the Y line  
should not be run close to other unrelated traces or over or near  
ground planes.  
Figure 1-7 Sample Electrode Geometries  
1.3 SINGLE ELECTRODE OPERATION  
An alternative mode of operation is shown in Figure 1-6.  
Capacitances Cx2a and Cx2b are implemented as discrete  
PARALLEL LINES  
SERPENTINE  
SPIRAL  
lQ  
- 3 -  
QT60040 / R1.04 / 0303  
©Quantum Research Group Ltd.  
possible to promote equal field coupling through the overlying detection by a jumper option (Table 2-1); this option applies to all  
keys.  
panel material and to increase sensitivity.  
Suggested design rules for interdigitated keys are shown in Max On-duration has no interaction among keys; a timeout on  
one key will have no effect on another key.  
1.5.5 DETECTION  
Figure 1-8.  
I
NTEGRATOR  
1.5 SIGNAL PROCESSING  
To suppress false detections caused by spurious events like  
electrical noise, the QT60040 incorporates a detection integration  
counter that increments with each detection sample until a limit is  
reached, at which point a detection is confirmed. If no detection is  
sensed on any of the samples prior to the final count, the counter  
is reset immediately to zero, forcing the process to restart. The  
required count is 3 samples per key.  
The QT60040 calibrates and processes all signals using a  
number of algorithms pioneered by Quantum. These algorithms  
are specifically designed to survive most environmental  
conditions.  
1.5.1 SELF-CALIBRATION  
The QT60040 is fully self-calibrating. On powerup it scans the  
matrix and sets appropriate calibration points for each. No special  
operator or factory calibration or circuit tweak is required to bring  
keys into operation. The self calibration procedure typically  
requires 1 second to complete.  
1.5.2 DRIFT  
C
OMPENSATION  
A
LGORITHM  
Signal drift can occur because of changes in Cx and Cs over  
time. It is crucial that drift be compensated for, otherwise false  
detections, non-detections, and sensitivity shifts will follow.  
Figure 1-8 Key Design Rules  
Drift compensation (Figure 1-9) is performed by making the  
reference level track the raw signal at a slow rate, but only while  
there is no detection in effect. The rate of adjustment is  
performed slowly, otherwise legitimate detections might be  
ignored. The QT60040 drift compensates using a slew-rate  
limited change to the reference level; the threshold and  
hysteresis values are slaved to this reference.  
X1  
0.75mm  
gaps  
18x18mm  
key size  
The QT60040's drift compensation is 'asymmetric': the  
drift-compensation occurs in one direction faster than it does in  
the other. Specifically, it compensates faster for decreasing  
loads. Increasing loads (more contact with an object, which  
results in a decreasing signal) should be compensated for slowly,  
so that sensitivity to an approaching finger is not affected.  
Removal of an object is compensated for at a faster rate to allow  
the sensor to recover quickly to prepare for the next valid touch.  
0.5mm  
lines  
X shield  
tails  
X2  
1.5.3 THRESHOLD AND  
H
YSTERESIS  
C
ALCULATIONS  
The threshold value is established as an offset to the reference  
level. As Cx and Cs drift over time, the reference drift  
compensates with the changes and the threshold level is  
automatically recomputed in real time so that it is never in error.  
Since key touches result in negative signal swings, the threshold  
is set below the signal reference level.  
The QT60040 employs a hysteresis of 25% of the delta between  
the reference and threshold levels. The signal must rise by 25%  
of the distance from threshold to reference before the detection  
event drops out and the key registers as untouched.  
Common  
Y Line  
1.5.4 MAX  
ON-DURATION  
If a foreign object contacts a key the signal may  
change enough to create a detection lasting for the  
duration of the contact. To overcome this, the part  
includes individual key timers which monitor detection  
duration. If a detection on a key exceeds the timer limit  
setting, the sensor will perform a full recalibration. This  
is known as the Max On-Duration feature.  
Figure 1-9 Drift Compensation  
Reference  
Hysteresis  
After the Max On-Duration interval has expired and the  
recalibration has taken place, the key will once again  
function normally even if still in contact with the foreign  
object, to the best of its ability. The Max On-Duration  
can be set to either 10 or 60 seconds of continuous  
Threshold  
Signal  
Output  
lQ  
- 4 -  
QT60040 / R1.04 / 0303  
©Quantum Research Group Ltd.  
Figure 2-1 Basic Circuit Diagram  
case the keys will continue to be functional after the time-out, to  
increased amounts of finger touch.  
+5  
2.3 POWER SUPPLY  
The IC uses the power supply rail as an internal reference  
voltage. If the power supply is shared with another electronic  
system, care should be taken to assure that the supply is free of  
digital spikes, sags, and surges which can adversely affect the  
circuit. The QT60040 will track slow changes in Vcc, but it can be  
adversely affected by rapid voltage steps and impulse noise on  
the supply rail.  
1
Vdd  
3
4
2
M1  
M2  
M3  
M4  
X1  
X2  
X3  
X4  
Opt1  
Opt2  
13  
12  
11  
The power supply can range from +2.5 to +5.5 volts, and should  
be regulated via a standard regulator such as a 78L05 type. In  
cases where low cost is an objective, it is possible to use  
double-zener regulation.  
5
6
7
8
Q1  
Q2  
Q3  
Q4  
For proper operation a 100nF (0.1uF) ceramic bypass capacitor  
should be used between Vdd and Vss; the bypass cap should be  
placed very close to the device’s power pins.  
10  
9
Y
Cs  
Cs  
Vss  
14  
2.4 OUTPUTS  
The device has four active-high outputs, one per sensing  
channel, which indicate touch. These outputs should be used for  
logic-level switching only and should not drive loads of more than  
1mA. High loads can cause shifts in device Vdd and Vss rails  
which can lead to spurious operation.  
2 - CIRCUIT SPECIFICS  
The basic QT60040 circuit is shown in Figure 2-1.  
2.5 ESD PROTECTION  
In general the QT60040 will be protected from direct static  
discharge by the overlying panel. However, even with a panel,  
transients can still flow into the electrode via induction, or in  
extreme cases, via dielectric breakdown. Porous or thin materials  
may allow a spark to tunnel right through the panel material.  
Testing is required to reveal any problems. The QT60040 does  
have diode protection on its terminals which can absorb and  
protect the device from most induced discharges, up to 20mA;  
the usefulness of the internal clamping will depend on the  
dielectric properties, panel thickness, rise time of the ESD  
transients, and their duration.  
2.1 C CAPACITOR  
S
The QT60040 requires only a single external sampling capacitor  
(Cs) to operate. This capacitor should have good stability  
characteristics. It is possible but not optimal to use an X7R type  
capacitor, but for best stability a plastic type such as polyester or  
PPS film should be used. Increasing values will result in  
increased sensitivity, but too much sensitivity can also result in  
spurious operation. The optimal value of Cs will depend on the  
type of panel material, its thickness, and key geometry;  
experimentation is required to determine the proper value.  
Typical suitable values of Cs range from 22nF to 220nF; 47nF is  
a good value to start from in most cases.  
The device pins can be further protected by inserting series  
resistance into the X and Y lines. The resistances chosen should  
not be so high as to interfere with the QT process. Every board  
layout is different and thus it is difficult to specify a suitable value,  
however, typical values will range from 1K ohms to 47K ohms. In  
serious cases additional low-capacitance high-conductance  
clamp diodes (e.g. BAV99) may be added to shunt ESD aside  
from the X and Y pins to the power and ground rails.  
2.2 OPTION PINS  
There are two option pins whose function is shown in Table 2-1.  
OPT1 is used to set the rollover option. If this pin is connected to  
ground, the IC will only sense one key at a time. If OPT1 is left  
open or connected to Vdd, the IC can sense any two keys  
simultaneously and will suppress additional keys.  
The QT60040's 'X' drive lines are always being driven at low  
impedance; they are never 3-state unless the circuit is just  
powering up or is powered down. This is a considerable  
advantage in dealing with ESD. The 4 output pins may also be  
vulnerable and should be resistor and/or diode protected if they  
are in danger of being subject to ESD.  
OPT2 is used to set the calibration time-out function. If OPT2 is  
connected to ground, keys will time out and recalibrate after 10  
seconds of continuous detection on a key. If OPT2 is left open or  
connected to Vdd, keys will recalibrate after 60 seconds. In either  
Table 2-1 Option Pin Functions  
OPT1  
OPT2  
Pin 3  
Vdd  
Vss  
Vdd  
Vss  
2 keys can be sensed  
1 key only can be sensed  
60 seconds to recalibration  
10 seconds to recalibration  
Pin 4  
lQ  
- 5 -  
QT60040 / R1.04 / 0303  
©Quantum Research Group Ltd.  
Figure 3-1 E604 PCB Schematic  
VCC  
1
CONN2  
Rollover  
CONN2  
2
1
1
2
J2  
J1  
U1  
M1  
M2  
M3  
M4  
1
3
4
5
6
7
8
2
V
C
C
Y
X
OPT1  
X1  
X2  
X3  
X4  
X
X
X
X
J1  
J3:1  
Recal Timeout  
2
13  
12  
11  
10  
9
Y
OPT2  
Q1  
X
J2  
J3:2  
3
Y
X
Q1  
J3:3  
4
Y
Q2  
X
Q2  
J3:4  
5
Q3  
Y
Q3  
J3:5  
C1  
G
N
D
6
Q4  
CS  
Q4  
47nF  
J3:6  
V+  
1
4
QT60040  
7
8
VB  
Vunreg  
Gnd  
J3:7  
J3:8  
Q4  
Q3  
Q2  
Q1  
V+  
VCC  
VB  
U2  
LM78L05ACZA  
2N4401  
2N4401  
2N4401  
2N4401  
ON  
D5  
S1  
2
A
K
C
E
VI  
VO  
G
1
3
1N4001  
B
2
3
1
4
1
5
1
1
Figure 3-2 E604 PCB Layers  
Silk Layer  
8
INTERFACE  
1
J2  
POWER  
BT1  
+
c
2000 QRG Ltd.  
J3  
S1  
OFF ON  
+
J1  
U1  
-
RS1  
M3  
C1  
Q3  
Q2  
Q4  
Q1  
M4  
M2  
M1  
Top Layer  
Bottom Layer  
lQ  
- 6 -  
QT60040 / R1.04 / 0303  
©Quantum Research Group Ltd.  
4.1 ABSOLUTE MAXIMUM SPECIFICATIONS  
Operating temp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . as designated by suffix  
Storage temp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55OC to +125OC  
V
DD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 to +7.0V  
Max continuous pin current, any control or drive pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mꢀ  
Short circuit duration to ground, any pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . infinite  
Short circuit duration to VDD, any pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . infinite  
Voltage forced onto any pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.6V to (Vdd + 0.6) Volts  
4.2 RECOMMENDED OPERATING CONDITIONS  
VDD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +2.5 to 5.25V  
Supply ripple+noise. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mV p-p max  
Cs value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22nF to 220nF  
Output load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1mꢀ  
4.3 DC SPECIFICATIONS  
Vdd = 5.0V, Cs = 47nF, T  
Parameter Description  
Supply current  
A
= recommended range, unless otherwise noted  
Min  
Typ  
Max  
Units  
Notes  
I
I
DD  
DD  
5
3
0.65  
0.4  
1.5  
0.6  
5.5  
0.8  
mA  
mA  
V
@ 5V  
@ 3V  
Supply current  
V
DD-VSS  
IL  
Supply voltage range  
Low input logic level  
High input logic level  
Low output voltage  
High output voltage  
Input leakage current  
Acquisition resolution  
2.5  
2.2  
V
V
V
HL  
OL  
V
V
0.6  
V
4mA sink  
VOH  
Vdd-0.7  
V
1mA source  
IIL  
1
µA  
bits  
AR  
12  
4.4 AC SPECIFICATIONS  
Vdd = 5.0V, Cs = 47nF, TA = recommended range, unless otherwise noted. Test circuit of Figure 3-1.  
Parameter  
Description  
Min  
Typ  
Max  
Units  
Notes  
Tr  
S
Response time  
85  
1
ms  
pF  
Cs and pad geometry dependent  
Sensitivity  
Fqt  
Tbs  
Td  
Sample frequency  
Burst spacing  
106  
5.3  
0.5  
kHz  
ms  
Power-up delay to operate  
1
secs  
lQ  
- 7 -  
QT60040 / R1.04 / 0303  
©Quantum Research Group Ltd.  
4.5 SIGNAL PROCESSING  
Parameter  
Description  
Min  
Typ  
Max  
Units  
Notes  
DI  
Mo  
T
Detection integrator counts  
Max On-Duration  
4
counts  
s
10  
60  
20%, option selectable  
counts of signal  
Threshold, D from reference  
Hysteresis  
4
25  
1
counts  
%
H
% of threshold  
DRp  
DRn  
Rd  
Drift rate, negative  
Drift rate, positive  
counts / s  
counts / s  
secs  
1
10  
Recalibration duration  
0.25  
0.5  
5.1 - ORDERING INFORMATION  
PART  
TEMP RANGE  
PACKAGE  
MARKING  
QT60040-D  
QT60040-IS  
0 - 70C  
-40 - 85C  
PDIP-14  
SOIC-14  
QT60040  
QT60040 - I  
lQ  
- 8 -  
QT60040 / R1.04 / 0303  
©Quantum Research Group Ltd.  
5.2 DUAL IN-LINE PACKAGE  
a
Y
a
A
Aa  
x
Pin 1 indicator  
M
Q
R
S1  
Base level  
r
Seating level  
S
L1  
F
P
L
m
Package Type: Dual-in-Line  
Millimeters  
Max  
Inches  
Max  
SYMBOL  
Min  
Notes  
Min  
Notes  
BSC  
a
A
M
m
Q
P
L1  
F
R
r
7.112  
7.874  
15.24  
18.8  
1.78  
0.36  
1.14  
2.54  
2.92  
0.38  
3.18  
3.56  
7.874  
8.128  
0.20  
7.493  
8.382  
15.24  
19.3  
2.03  
0.56  
1.78  
2.54  
3.68  
-
3.43  
4.32  
7.874  
9.906  
0.38  
0.28  
0.31  
0.6  
0.74  
0.295  
0.33  
0.6  
0.76  
0.08  
0.022  
0.070  
0.100  
0.145  
-
0.135  
0.17  
0.31  
0.39  
0.015  
BSC  
0.07  
0.014  
0.045  
0.100  
0.115  
0.015  
0.125  
0.14  
0.31  
0.32  
0.008  
Typical  
BSC  
Typical  
BSC  
S
S1  
Aa  
x
Y
Typical  
Typical  
5.3 SMALL OUTLINE PACKAGE  
D
L
ß×45º  
e
2a  
W
ø
E
M
Base level  
Seating level  
h H  
Package Type: 14 Pin SOIC  
Millimeters  
Max  
Inches  
Max  
SYMBOL  
Min  
Notes  
Min  
Notes  
M
W
2a  
H
h
D
L
E
e
8.56  
5.79  
3.81  
1.35  
0.10  
1.27  
0.36  
0.41  
0.20  
0.25  
0
8.81  
6.20  
3.99  
1.75  
0.25  
1.27  
0.51  
1.27  
0.25  
0.51  
8
0.337  
0.228  
0.150  
0.31  
0.004  
0.050  
0.014  
0.016  
0.008  
0.014  
0
0.347  
0.244  
0.157  
0.33  
0.010  
0.050  
0.020  
0.050  
0.010  
0.020  
8
BSC  
BSC  
B
o
lQ  
- 9 -  
QT60040 / R1.04 / 0303  
©Quantum Research Group Ltd.  
QT60040  
lQ  
Copyright © 2002 QRG Ltd. All rights reserved.  
Patented and patents pending  
Corporate Headquarters  
1 Mitchell Point  
Ensign Way, Hamble SO31 4RF  
Great Britain  
Tel: +44 (0)23 8056 5600 Fax: +44 (0)23 8045 3939  
admin@qprox.com  
www.qprox.com  
North America  
651 Holiday Drive Bldg. 5 / 300  
Pittsburgh, PA 15220 USA  
Tel: 412-391-7367 Fax: 412-291-1015  
The specifications set out in this document are subject to change without notice. All products sold and services supplied by QRG are subject  
to our Terms and Conditions of sale and supply of services which are available online at www.qprox.com and are supplied with every order  
acknowledgement. QProx, QTouch, QMatrix, QLevel, and QSlide are trademarks of QRG. QRG products are not suitable for medical  
(including life-saving equipment), safety or mission critical applications or other similar purposes. Except as expressly set out in QRG's Terms  
and Conditions, no licenses to patents or other intellectual property of QRG (express or implied) are granted by QRG in connection with the  
sale of QRG products or provision of QRG services. QRG will not be liable for customer product design and customers are entirely  
responsible for their products and applications which incorporate QRG's products.  
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