Datenblatt-pdf.com


QT110H Schematic ( PDF Datasheet ) - QUANTUM

Teilenummer QT110H
Beschreibung SENSOR ICs
Hersteller QUANTUM
Logo QUANTUM Logo 




Gesamt 12 Seiten
QT110H Datasheet, Funktion
www.DataSheet4U.com
lQ
Less expensive than many mechanical switches
Projects a ‘touch button’ through any dielectric
100% autocal for life - no adjustments required
No active external components
Piezo sounder direct drive for ‘tactile’ click feedback
LED drive for visual feedback
2.5 ~ 5V single supply operation
10µA at 2.5V - very low power drain
Toggle mode for on/off control (via option pins)
10s or 60s auto-recalibration timeout (via option pins)
Pulse output mode (via option pins)
Gain settings in 3 discrete levels
Simple 2-wire operation possible
HeartBeat™ health indicator on output
Active low (QT110), active high (QT110H) versions
QT110 / QT110H
QTOUCH™ SENSOR ICs
Vdd
Out
Opt1
Opt2
1
2
3
4
8 Vss
7 Sns2
6 Sns1
5 Gain
APPLICATIONS -
Light switches
Industrial panels
Appliance control
Security systems
Access systems
Pointing devices
Elevator buttons
Consumer electronics
The QT110 / QT110H charge-transfer (“QT’”) sensor chips are self-contained digital ICs used to implement near-proximity or touch
sensors. They project sense fields through almost any dielectric, like glass, plastic, stone, ceramic, and wood. They can also turn small
metal-bearing objects into intrinsic sensors, making them respond to proximity or touch. This capability coupled with an ability to
self-calibrate continuously leads to entirely new product concepts.
These devices are designed specifically for human interfaces, like control panels, appliances, toys, lighting controls, or anywhere a
mechanical switch or button may be found; they may also be used for some material sensing and control applications provided that the
presence duration of objects does not exceed the recalibration timeout interval.
A piezo element can also be connected to create a feedback click sound.
These ICs require only a common inexpensive capacitor in order to function. Average power consumption is under 20µA in most
applications, allowing battery operation.
The devices employ digital signal processing techniques pioneered by Quantum, designed to make them survive real-world challenges,
such as ‘stuck sensor’ conditions and signal drift. Sensitivity is digitally determined for the highest possible stability. No external active
components are required for operation.
The devices include several user-selectable built-in features. One, toggle mode, permits on/off touch control for example for light switch
replacement. Another makes the sensor output a pulse instead of a DC level, which allows the device to 'talk' over the power rail,
permitting a simple 2-wire twisted-pair interface. Quantum’s unique HeartBeat™ signal is also included, allowing a host controller to
continuously monitor sensor health.
By using the charge transfer principle, these ICs deliver a level of performance clearly superior to older technologies in a highly
cost-effective package.
TA
00C to +700C
00C to +700C
-400C to +850C
-400C to +850C
lq
AVAILABLE OPTIONS
SOIC
-
-
QT110-IS
QT110H-IS
8-PIN DIP
QT110-D
QT110H-D
-
-
©1999-2004 Quantum Research Group
QT110/110H R1.03/0604






QT110H Datasheet, Funktion
Figure 2-4
Getting HB pulses with a pull-down resistor (QT110 shown;
use pull-up resistor with QT110H)
Figure 2-5
Using a micro to obtain HB pulses in either output state
(QT110 or QT110H)
+2 .5 to 5
H eartBeat™ P ulses
1
2 Vdd
7
O UT
SNS2
Ro
3
O PT1
5
GAIN
P O RT_M.x
Ro
M icro processo r
2
OUT
3
OPT1
7
SN S 2
5
GA IN
4
O PT2
6
SNS1
Vss
8
P O RT_M.y
4
OPT2
6
SN S 1
Care should be taken when the IC and the load are both
powered from the same supply, and the supply is minimally
regulated. The device derives its internal references from the
power supply, and sensitivity shifts can occur with changes in
Vdd, as happens when loads are switched on. This can induce
detection ‘cycling’, whereby an object is detected, the load is
turned on, the supply sags, the detection is no longer sensed,
the load is turned off, the supply rises and the object is
reacquired, ad infinitum. To prevent this occurrence, the output
should only be lightly loaded if the device is operated from an
unregulated supply, e.g. batteries. Detection ‘stiction’, the
opposite effect, can occur if a load is shed when Out is active.
QT110: The output of the QT110 can directly drive a resistively
limited LED. The LED should be connected with its cathode to
the output and its anode towards Vcc, so that it lights when the
sensor is active-low. If desired the LED can be connected from
Out to ground, and driven on when the sensor is inactive, but
only with less drive current (1mA).
QT110H: This part is active-high, so it works in reverse to that
described above.
3.2 ELECTRODE WIRING
See also Section 3.4.
The wiring of the electrode and its connecting trace is important
to achieving high signal levels and low noise. Certain design
rules should be adhered to for best results:
1. Use a ground plane under the IC itself and Cs and Rs but
NOT under Re, or under or closely around the electrode or
its connecting trace. Keep ground away from these things
to reduce stray loading (which will dramatically reduce
sensitivity).
2. Keep Cs, Rs, and Re very close to the IC.
3. Make Re as large as possible. As a test, check to be sure
that an increase of Re by 50% does not appreciably
decrease sensitivity; if it does, reduce Re until the 50%
test increase has a negligible effect on sensitivity.
4. Do not route the sense wire near other ‘live’ traces
containing repetitive switching signals; the sense trace will
pick up noise from them.
3 - CIRCUIT GUIDELINES
3.1 SAMPLE CAPACITOR
When used for most applications, the charge sampler Cs can
be virtually any plastic film or good quality ceramic capacitor.
The type should be relatively stable in the anticipated
temperature range. If fast temperature swings are expected,
especially at higher sensitivity, a more stable capacitor might
be required for example PPS film.
In most moderate applications a low-cost X7R type will work
fine.
Figure 2-6 Eliminating HB Pulses
G AT E OR
MIC RO INP U T
CMO S
Co
100pF
2
O UT
3
O PT1
7
SN S 2
5
GA IN
4
O PT2
6
SN S 1
3.3 POWER SUPPLY, PCB LAYOUT
See also Section 3.4.
The power supply can range from 2.5 to 5.0 volts. At 2.5 volts
current drain averages less than 10µA with Cs = 10nF,
provided a 470K Rs resistor is used (Figure 2-6). Idd curves
are shown in Figure 4-4.
Higher values of Cs will raise current drain. Higher Cx values
can actually decrease power drain. Operation can be from
batteries, but be cautious about loads causing supply droop
(see Output Drive, Section 2.2.6) if the batteries are
unregulated.
As battery voltage sags with use or fluctuates slowly with
temperature, the IC will track and compensate for these
changes automatically with only minor changes in sensitivity.
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
device. The IC will track slow changes in Vdd, but it can be
affected by rapid voltage steps.
if desired, the supply can be regulated using a conventional
low current regulator, for example CMOS LDO regulators that
have nanoamp quiescent currents. Care should be taken that
the regulator does not have a minimum load specification,
which almost certainly will be violated by the QT110's low
current requirement. Furthermore, some LDO regulators are
unable to provide adequate transient regulation between the
LQ
6 QT110/110H R1.03/0604

6 Page









QT110H pdf, datenblatt
lQ
Copyright © 1999 - 2004 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 80565600
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
acknowledgment. QProx, QTouch, QMatrix, QWheel, QLevel, and QSlide are trademarks of QRG. QRG products are not suitable for
medical (including lifesaving 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.

12 Page





SeitenGesamt 12 Seiten
PDF Download[ QT110H Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
QT110SENSOR ICsQUANTUM
QUANTUM
QT1100A-ISG10 KEY QTOUCH SENSOR ICQUANTUM
QUANTUM
QT110110 KEY QTOUCH SENSOR ICQUANTUM
QUANTUM
QT110310-KEY SENSOR ICQUANTUM
QUANTUM
QT1106-ISGQWHEEL/QSLIDE/QTOUCH ICQUANTUM
QUANTUM

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche