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CHARGE-TRANSFER TOUCH SENSOR



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QT113-IS 데이터시트, 핀배열, 회로
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


QT113-IS 데이터시트, 핀배열, 회로
1 - OVERVIEW
Figure 1-1 Standard mode options
The QT113 is a digital burst mode charge-transfer (QT)
+2.5 to 5
sensor designed specifically for touch controls; it includes all
hardware and signal processing functions necessary to
provide stable sensing under a wide variety of changing
conditions. Only a single low cost, non-critical capacitor is
required for operation.
Figure 1-1 shows the basic QT113 circuit using the device,
1
2 Vdd 7
OUT
SNS2
SENSING
ELECTRODE
with a conventional output drive and power supply
connections.
3
OPT1
5
GAIN
1.1 BASIC OPERATION
The QT113 employs bursts of charge-transfer cycles to
acquire its signal. Burst mode permits power consumption in
the microamp range, dramatically reduces RF emissions,
lowers susceptibility to EMI, and yet permits excellent
response time. Internally the signals are digitally processed
4
OPT2
OUTPUT=DC
TIMEOUT=10 Secs
TOGGLE=OFF
GAIN=HIGH
Vss
8
SNS1
6
Cs
10nF
Cx
to reject impulse noise, using a 'consensus' filter which
requires three consecutive confirmations of a detection 1.2 ELECTRODE DRIVE
before the output is activated.
The internal ADC treats Cs as a floating transfer capacitor; as
a direct result, the sense electrode can be connected to
The QT switches and charge measurement hardware either SNS1 or SNS2 with no performance difference. In both
functions are all internal to the QT113 (Figure 1-2). A 14-bit cases the rule Cs >> Cx must be observed for proper
single-slope switched capacitor ADC includes both the operation. The polarity of the charge buildup across Cs
required QT charge and transfer switches in a configuration during a burst is the same in either case.
that provides direct ADC conversion. The ADC is designed to
dynamically optimize the QT burst length according to the It is possible to connect separate Cx and Cx’ loads to SNS1
rate of charge buildup on Cs, which in turn depends on the and SNS2 simultaneously, although the result is no different
values of Cs, Cx, and Vdd. Vdd is used as the charge than if the loads were connected together at SNS1 (or
reference voltage. Larger values of Cx cause the charge SNS2). It is important to limit the amount of stray capacitance
transferred into Cs to rise more rapidly, reducing available on both terminals, especially if the load Cx is already large,
resolution; as a minimum resolution is required for proper for example by minimizing trace lengths and widths so as not
operation, this can result in dramatically reduced apparent to exceed the Cx load specification and to allow for a larger
gain. Conversely, larger values of Cs reduce the rise of sensing electrode size if so desired.
differential voltage across it, increasing available resolution
by permitting longer QT bursts. The value of Cs can thus be
increased to allow larger values of Cx to be tolerated (Figures
4-1, 4-2, 4-3 in Specifications, rear).
The PCB traces, wiring, and any components associated with
or in contact with SNS1 and SNS2 will become touch
sensitive and should be treated with caution to limit the touch
area to the desired location. Multiple touch electrodes can be
The IC is responsive to both Cx and Cs, and changes in Cs used, for example to create a control button on both sides of
can result in substantial changes in sensor gain.
an object, however it is impossible for the sensor to
distinguish between the two touch areas.
Option pins allow the selection or alteration of several special
features and sensitivity.
1.3 ELECTRODE DESIGN
Result
Start
Figure 1-2 Internal Switching & Timing
SNS2
ELE C TRO DE
Do ne
Cs
SNS1
Cx
1.3.1 ELECTRODE GEOMETRY AND SIZE
There is no restriction on the shape of
the electrode; in most cases common
sense and a little experimentation can
result in a good electrode design. The
QT113 will operate equally well with
long, thin electrodes as with round or
square ones; even random shapes are
acceptable. The electrode can also be
a 3-dimensional surface or object.
Sensitivity is related to electrode
surface area, orientation with respect
to the object being sensed, object
composition, and the ground coupling
quality of both the sensor circuit and
the sensed object.
C ha rg e
Am p
If a relatively large electrode surface is
desired, and if tests show that the
electrode has more capacitance than
the QT113 can tolerate, the electrode
-2-




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