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PDF QT113 Datasheet ( Hoja de datos )

Número de pieza QT113
Descripción CHARGE-TRANSFER TOUCH SENSOR
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QT113 datasheet

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QT113 pdf
operation. To prevent this, the sensor includes a timer which increasing levels of Cs reduce response time. Figure 4-3
monitors detections. If a detection exceeds the timer setting, shows the typical effects of Cs and Cx on response time.
the timer causes the sensor to perform a full recalibration
(when not set to infinite). This is known as the Max 2.2 OUTPUT FEATURES
On-Duration feature.
The QT113 is designed for maximum flexibility and can
After the Max On-Duration interval, the sensor will once again accommodate most popular sensing requirements. These
function normally, even if partially or fully obstructed, to the are selectable using strap options on pins OPT1 and OPT2.
best of its ability given electrode conditions. There are two All options are shown in Table 2-1.
finite timeout durations available via strap option: 10 and 60
seconds (Table 2-1).
2.2.1 DC MODE OUTPUT
The output of the QT113 can respond in a DC mode, where
2.1.4 DETECTION INTEGRATOR
the output is active-low upon detection. The output will
It is desirable to suppress detections generated by electrical remain active-low for the duration of the detection, or until the
noise or from quick brushes with an object. To accomplish Max On-Duration expires (if not infinite), whichever occurs
this, the QT113 incorporates a detect integration counter that first. If a max on-duration timeout occurs first, the sensor
increments with each detection until a limit is reached, after performs a full recalibration and the output becomes inactive
which the output is activated. If no detection is sensed prior until the next detection.
to the final count, the counter is reset immediately to zero. In
the QT113, the required count is 3.
In this mode, three Max On-Duration timeouts are available:
10 seconds, 60 seconds, and infinite.
The Detection Integrator can also be viewed as a 'consensus'
filter, that requires three detections in three successive bursts
to create an output.
Table 2-1 Output Mode Strap Options
2.1.5 FORCED SENSOR RECALIBRATION
The QT113 has no recalibration pin; a forced recalibration is
Tie
Pin 3 to:
Tie
Pin 4 to:
Max On-
Duration
accomplished only when the device is powered up. However,
DC Out
Vdd
Vdd
10s
supply drain is low so it is a simple matter to treat the entire
DC Out
Vdd
Gnd
60s
IC as a controllable load; simply driving the QT113's Vdd pin
directly from another logic gate or a microcontroller port
Toggle
Gnd
Gnd
10s
(Figure 2-2) will serve as both power and 'forced recal'. The
DC Out
Gnd
Vdd infinite
source resistance of most CMOS gates and microcontrollers
are low enough to provide direct power without problem. Note Infinite timeout is useful in applications where a prolonged
that most 8051-based micros have only a weak pullup drive detection can occur and where the output must reflect the
capability and will require CMOS buffering. 74HC or 74AC detection no matter how long. In infinite timeout mode, the
series gates can directly power the QT113, as can most other designer should take care to be sure that drift in Cs, Cx, and
microcontrollers.
Vdd do not cause the device to ‘stick on’ inadvertently even
Option strap configurations are read by the QT113 only on when the target object is removed from the sense field.
powerup. Configurations can only be changed by powering
the QT113 down and back up again; again, a microcontroller
can directly alter most of the configurations and cycle power
to put them in effect.
2.2.2 TOGGLE MODE OUTPUT
This makes the sensor respond in an on/off mode like a flip
flop. It is most useful for controlling power loads, for example
in kitchen appliances, power tools, light switches, etc.
2.1.6 RESPONSE TIME
The QT113's response time is highly dependent on burst
length, which in turn is dependent on Cs and Cx (see Figures
4-1, 4-2). With increasing Cs, response time slows, while
Figure 2-2 Powering From a CMOS Port Pin
P O RT X .m
C MO S
m icro controller
P O RT X .n
0.01µF
O UT
Vdd
Q T11 0
Max On-Duration in Toggle mode is fixed at 10 seconds.
When a timeout occurs, the sensor recalibrates but leaves
the output state unchanged.
2.2.3 HEARTBEAT™ OUTPUT
The QT113 output has a full-time HeartBeat™ ‘health’
indicator superimposed on it. This operates by taking 'Out'
into a 3-state mode for 300µs once after every QT burst. This
output state can be used to determine that the sensor is
operating properly, or, it can be ignored using one of several
simple methods.
The HeartBeat indicator can be sampled by using a pulldown
resistor on Out, and feeding the resulting negative-going
pulse into a counter, flip flop, one-shot, or other circuit. Since
Out is normally high, a pulldown resistor will create negative
HeartBeat pulses (Figure 2-3) when the sensor is not
detecting an object; when detecting an object, the output will
remain low for the duration of the detection, and no
HeartBeat pulse will be evident.
V ss If the sensor is wired to a microcontroller as shown in Figure
2-4, the microcontroller can reconfigure the load resistor to
either ground or Vcc depending on the output state of the
QT113, so that the pulses are evident in either state.
-5-

5 Page

QT113 arduino
Chart 4-3 - Typical Response Time vs. Cx;
Vdd = 3.0
1000.00
100.00
10.00
10nF
20nF
50nF
100nF
200nF
500nF
1.00
0
10 20 30
Cx Load
40
5 ORDERING INFORMATION
PART
QT113-D
QT113-S
QT113-IS
QT113H-D
QT113H-S
QT113H-IS
TEMP RANGE
0 - 70C
0 - 70C
-40 - 85C
0 - 70C
0 - 70C
-40 - 85C
PACKAGE
PDIP
SOIC-8
SOIC-8
PDIP
SOIC-8
SOIC-8
MARKING
QT1 + 13
QT1 + 3
QT1 + F
QT1 + 13H
QT1 + E
QT1 + K
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