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QT113H-IS Schematic ( PDF Datasheet ) - ETC

Teilenummer QT113H-IS
Beschreibung CHARGE-TRANSFER TOUCH SENSOR
Hersteller ETC
Logo ETC Logo 




Gesamt 12 Seiten
QT113H-IS Datasheet, Funktion
QProxQT113 / QT113H
CHARGE-TRANSFER TOUCH SENSOR
! Projects a proximity field through air
! Less expensive than many mechanical switches
! Sensitivity easily adjusted via capacitor value
! Turns small objects into intrinsic touch sensors
! 100% autocal for life - no adjustments required
! 2.5 to 5V, 600µA single supply operation
! Toggle mode for on/off control (strap option)
! 10s, 60s, infinite auto-recal timeout (strap options)
! Gain settings in 2 discrete levels
! HeartBeat™ health indicator on output
! Active-low (QT113) or active-high outputs (QT113H)
! Only one external part required - a 1¢ capacitor
Vdd
O ut
O pt1
O pt2
1
2
3
4
8 Vss
7 Sn s2
6 Sn s1
5 Gain
APPLICATIONS -
! Light switches
! Prox sensors
! Appliance control
! Security systems
! Access systems
! Pointing devices
! Elevator buttons
! Toys & games
The QT113 charge-transfer (“QT’”) touch sensor is a self-contained digital IC capable of detecting near-proximity or touch. It will
project a proximity sense field through air, via almost any dielectric, like glass, plastic, stone, ceramic, and most kinds of wood. It can
also turn small metal-bearing objects into intrinsic sensors, making them responsive to proximity or touch. This capability coupled with
its ability to self calibrate continuously can lead to entirely new product concepts.
It is designed specifically for human interfaces, like control panels, appliances, toys, lighting controls, or anywhere a mechanical
switch or button may be found; it 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.
The QT113 requires only a common inexpensive capacitor in order to function.
Power consumption is only 600µA in most applications. In most cases the power supply need only be minimally regulated, for example
by Zener diodes or an inexpensive 3-terminal regulator.
The QT113’s RISC core employs signal processing techniques pioneered by Quantum; these are specifically designed to make the
device survive real-world challenges, such as ‘stuck sensor’ conditions and signal drift. Even sensitivity is digitally determined and
remains constant in the face of large variations in sample capacitor CS and electrode CX. No external switches, opamps, or other
analog components aside from CS are usually required.
The option-selectable toggle mode permits on/off touch control, for example for light switch replacement. The Quantum-pioneered
HeartBeat™ signal is also included, allowing a host microcontroller to monitor the health of the QT113 continuously if desired. By
using the charge transfer principle, the IC delivers 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
Quantum Research Group Ltd
AVAILABLE OPTIONS
SOIC
QT113-S
QT113H-S
QT113-IS
QT113H-IS
8-PIN DIP
QT113-D
QT113H-D
-
-
Copyright Quantum Research Group Ltd
R1.10/0104






QT113H-IS Datasheet, Funktion
Figure 2-3
Getting HearBeat pulses with a pull-down resistor
+2 .5 to 5
H eartBeat™ P ulses
1
2 Vdd 7
O UT
SNS2
Ro
3
O PT1
5
GAIN
4
O PT2
6
SNS1
Vss
8
Figure 2-4
Using a micro to obtain HB pulses in either output state
PORT_M.x
Ro
Microcontroller
PORT_M.y
2
OUT
3
OPT1
4
OPT2
7
SNS2
5
GAIN
6
SNS1
Electromechanical devices like relays will usually ignore this ‘stiction’, the opposite effect, can occur if a load is shed when
short pulse. The pulse also has too low a duty cycle to visibly Out is active.
affect LED’s. It can be filtered completely if desired, by
adding an RC timeconstant to filter the output, or if interfacing
directly and only to a high-impedance CMOS input, by doing
nothing or at most adding a small non-critical capacitor from
Out to ground (Figure 2-5).
The output of the QT113 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. If desired the LED can be connected
from Out to ground, and driven on when the sensor is
The QT113H variant has an active-high output; the heartbeat inactive.
signal of the QT113H works in exactly the same manner.
The QT113H variant has an active-high output.
2.2.4 OUTPUT DRIVE
The QT113’s `output is active low and can sink up to 5mA of
non-inductive current. If an inductive load is used, such as a
3 - CIRCUIT GUIDELINES
small relay, the load should be diode clamped to prevent
damage. When set to operate in a proximity mode (at high
gain) the current should be limited to 1mA to prevent gain
shifting side effects from occurring, which happens when the
load current creates voltage drops on the die and bonding
wires; these small shifts can materially influence the signal
level to cause detection instability as described below.
Care should be taken when the QT113 and the load are both
3.1 SAMPLE CAPACITOR
Charge sampler Cs can be virtually any plastic film or
medium-K ceramic capacitor. The acceptable Cs range is
from 10nF to 500nF depending on the sensitivity required;
larger values of Cs demand higher stability to ensure reliable
sensing. Acceptable capacitor types include polycarbonate,
PPS film, or NPO/C0G ceramic.
powered from the same supply, and the supply is minimally
regulated. The QT113 derives its internal references from the
3.2 OPTION STRAPPING
power supply, and sensitivity shifts can occur with changes in The option pins Opt1 and Opt2 should never be left floating.
Vdd, as happens when loads are switched on. This can If they are floated, the device will draw excess power and the
induce detection ‘cycling’, whereby an object is detected, the options will not be properly read on powerup. Intentionally,
load is turned on, the supply sags, the detection is no longer there are no pullup resistors on these lines, since pullup
sensed, the load is turned off, the supply rises and the object resistors add to power drain if tied low.
is reacquired, ad infinitum. To prevent this occurrence, the The Gain input should be connected to either Vdd or Gnd.
output should only be lightly loaded if the device is operated
from an unregulated supply, e.g. batteries. Detection Tables 1-1 and 2-1 show the option strap configurations
available.
Figure 2-5 Eliminating HB Pulses
G ATE OR
MICRO INPUT
CMO S
Co
100pF
2
O UT
3
O PT 1
7
SN S 2
5
GA IN
4
O PT 2
6
SN S 1
3.4 POWER SUPPLY, PCB LAYOUT
The power supply can range from 2.5 to 5.0 volts. At 3 volts
current drain averages less than 600µA in most cases, but
can be higher if Cs is large. Increasing Cx values will actually
decrease power drain. Operation can be from batteries, but
be cautious about loads causing supply droop (see Output
Drive, previous section).
As battery voltage sags with use or fluctuates slowly with
temperature, the QT113 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
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QT113H-IS pdf, datenblatt
Quantum Research Group Ltd
©2001QRG Ltd.
Patented and patents pending
651 Holiday Drive Bldg. 5 / 300
Pittsburgh, PA 15220 USA
Tel: 412-391-7367 Fax: 412-291-1015
http://www.qprox.com
In the United Kingdom
Enterprise House, Southampton, Hants SO14 3XB
Tel: +44 (0)23 8045 3934 Fax: +44 (0)23 8045 3939
This device expressly not for use in any medical or human safety related
application without the express written consent of an officer of the company.

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