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부품번호 QT150 기능
기능 (QT140 / QT150) 4 AND 5 KEY QTOUCH SENSOR ICs
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QT150 데이터시트, 핀배열, 회로
www.DataSheet4U.com
lQ
QProx™ QT140 / QT150
4 AND 5 KEY QTOUCHSENSOR ICs
Completely independent QT touch circuits
Individual logic outputs per channel (open drain)
Projects prox fields through any dielectric
Only one external capacitor required per channel
Sensitivity easily adjusted on a per-channel basis
100% autocal for life - no adjustments required
3~5.5V, 5mA single supply operation
Toggle mode for on/off control (strap option)
10s, 60s, infinite auto-recal timeout (strap options)
AKS™ Adjacent Key Suppression (pin option)
Sync pin for multi-chip sync or line sync
Less expensive per key than many mechanical switches
Eval board with backlighting - p/n E160
SSOP
DIP
Vss
Vss
Vdd
Vdd
SNS1A
SNS1B
SNS2A
SNS2B
SNS3A
SNS3B
SNS4A
SNS4B
SNS5A
Vss
/RST
OSC_I
OSC_O
OPT2
OPT1
SYNC
OUT5
OUT4
OUT3
OUT2
OUT1
AKS
OC
SNS5B
Vdd
Vdd
Vss
Vss
Vss
SNS1A
SNS1B
SNS2A
SNS2B
SNS3A
SNS3B
SNS4A
SNS4B
SNS5A
/RST
OSC_I
OSC_O
OPT2
OPT1
SYNC
OUT5
OUT4
OUT3
OUT2
OUT1
AKS
OC
SNS5B
QT150 shown - NOTE: Pinouts are not the same!
APPLICATIONS
PC Peripherals
Backlighted buttons
Appliance controls
Security systems
Access systems
Pointing devices
Instrument panels
Gaming machines
QT140 / QT150 charge-transfer (“QT’”) QTouch ICs are self-contained digital controllers capable of detecting near-proximity or
touch on 4 or 5 electrodes. They allow electrodes to project independent sense fields through any dielectric like glass, plastic,
stone, ceramic, and wood. They can also turn metal-bearing objects into intrinsic sensors, making them responsive to proximity
or touch. This capability coupled with their continuous self-calibration feature can lead to entirely new product concepts, adding
high value to product designs.
Each of the channels operates independently of the others, and each can be tuned for a unique sensitivity level by simply
changing its sample capacitor value.
The devices are designed specifically for human interfaces, like control panels, appliances, gaming devices, lighting controls,
or anywhere a mechanical switch or button may be found; they may also be used for some material sensing and control
applications.
These devices require only a common inexpensive capacitor per sensing channel in order to function. They also offer patent
pending AKS™ Adjacent Key Suppression which suppresses touch from weaker responding keys and allows only a dominant
key to detect, for example to solve the problem of large fingers on tightly spaced keys.
These devices also have a SYNC I/O pin which allows for synchronization with additional similar parts and/or to an external to
suppress interference.
The RISC core of these devices use signal processing techniques pioneered by Quantum which are designed to survive
numerous real-world challenges, such as ‘stuck sensor’ conditions, component ageing, moisture films, and signal drift.
By using the charge transfer principle, these devices deliver a level of performance clearly superior to older technologies yet
are highly cost-effective.
TA
00C to +700C
-400C to +1050C
00C to +700C
-400C to +1050C
LQ
AVAILABLE OPTIONS
SSOP-28
-
QT140-AS
-
QT150-AS
DIP-28
QT140-D
-
QT150-D
-
Copyright © 2002 QRG Ltd
QT140/150 1.01/1102




QT150 pdf, 반도체, 판매, 대치품
Figure 1-4 Open Electrode for Back-Illumination
Figure 1-5 Shielding Against Fringe Fields
Sense
wire
Sense
w ire
complete the return path. If the circuit ground cannot be
earth grounded by wire, for example via the supply
connections, then a virtual capacitive groundmay be
required to increase return coupling.
A virtual capacitive groundcan be created by connecting
the IC's circuit ground to:
(1) A nearby piece of metal or metallized housing;
(2) A floating conductive ground plane;
(3) A larger electronic device (to which its output might be
connected anyway).
Free-floating ground planes such as metal foils should
maximize exposed surface area in a flat plane if possible. A
square of metal foil will have little effect if it is rolled up or
crumpled into a ball. Virtual ground planes are more effective
and can be made smaller if they are physically bonded to
other surfaces, for example a wall or floor.
1.3.5 FIELD SHAPING
The electrode can be prevented from sensing in undesired
directions with the assistance of metal shielding connected
to circuit ground (Figure 1-5). For example, on flat surfaces,
the field can spread laterally and create a larger touch area
than desired. To stop field spreading, it is only necessary to
surround the touch electrode on all sides with a ring of metal
connected to circuit ground. The ring will stop field spreading
from that point outwards.
If one side of the panel to which the electrode is fixed has
moving traffic near it, these objects can cause inadvertent
detections. This is called walk-byand is caused by the fact
that the fields radiate from either surface of the electrode
equally well. Again, shielding in the form of a metal sheet or
foil connected to circuit ground will prevent walk-by; putting
an air gap between the grounded shield and the electrode
will help to keep the value of Cx low.
1.3.6 SENSITIVITY
Sensitivity can be altered to suit various applications and
situations on a channel-by-channel basis. The easiest and
most direct way to impact sensitivity is to alter the value of
Cs; more Cs yields higher sensitivity.
1.3.6.1 Alternative Ways to Increase Sensitivity
Sensitivity can also be increased by using bigger electrodes,
reducing panel thickness, or altering panel composition.
Increasing electrode size can have diminishing returns, as
high values of Cx counteract sensor gain; however, Cs can
be increased to combat this up to the rated device limit. Also,
increasing the electrode's surface area will not substantially
increase touch sensitivity if its diameter is already much
larger in surface area than fingertip contact area.
The panel or other intervening material can be made thinner,
but again there are diminishing rewards for doing so. Panel
material can also be changed to one having a higher
dielectric constant, which will help propagate the field
through to the front. Locally adding some conductive material
to the panel (conductive materials essentially have an infinite
dielectric constant) will also help; for example, adding carbon
or metal fibers to a plastic panel will greatly increase frontal
field strength, even if the fiber density is too low to make the
plastic bulk-conductive.
1.3.6.2 Decreasing Sensitivity
In some cases the circuit may be too sensitive. Gain can be
lowered further by a number of strategies: a) making the
electrode smaller, b) making the electrode into a sparse
mesh using a high space-to-conductor ratio (Figure 1-3), or
c) by decreasing the Cs capacitors.
lQ
4 QT140/150 1.01/1102

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QT150 전자부품, 판매, 대치품
2.2 OUTPUT FEATURES
These devices are designed for maximum flexibility and can
accommodate most popular sensing requirements via option
pins.
OPT1 and OPT2 inputs control the output mode and Max
On-Duration settings;
OC controls the output drive type;
AKS controls the use of Adjacent Key Suppression.
All option pins are read by the IC once each complete
acquisition cycle and can be changed during operation.
OPT1 and OPT2 modes are shown in Table 2-1. These OPT
pins affect all sensing channels.
2.2.1 DC MODE OUTPUTS
Outputs can respond in a DC mode, where they are active
upon a confirmed detection. An output will remain active for
the duration of the detection, or until the ‘Max On-Duration’
expires (if not infinite), whichever occurs first. If a Max
On-Duration timeout occurs first, the sensor performs a full
recalibration and the output becomes inactive until the next
detection.
2.2.2 TOGGLE MODE OUTPUTS
This mode makes the sensor respond in an on/off flip-flop
mode. It is useful for controlling power loads, for example in
kitchen appliances, power tools, light switches, etc. or
wherever a ‘touch-on / touch-off’ effect is required.
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 OUTPUT DRIVE; OC OPTION PIN
The OC pin controls the output drive type.
OC=0: When tied low, the output is ‘push-pull’, i.e. ‘normal’.
In this mode, the OUT pins are active-high and can source
1mA and sink 5mA of non-inductive current.
OC=1: When tied high, the output is ‘open drain’ or ‘open
collector’, i.e. There is no internal pullup device in this mode;
OUT pins are active-low and can sink 5mA of non-inductive
current.
If inductive loads are used, such as small relays, the
inductances should be diode clamped to prevent damage.
When set to operate in a proximity mode (at high gain)
output pin currents 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 IC and the loads are both
powered from the same supply, and the supply is minimally
regulated. These devices derive their 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 Out pins should only be lightly
loaded if the device is operated from an unregulated supply,
Table 2-1 OPT Strap Options
OPT1
OPT2
Max On-Duration
DC Out
Gnd
Vdd
10s
DC Out
Vdd
Gnd
60s
Toggle
Vdd
Vdd
10s
DC Out
Gnd
Gnd
infinite
e.g. batteries. Detection ‘stiction’, the opposite effect, can
occur if a load is shed when an Out pin is active.
2.3 AKS™ - ADJACENT KEY SUPPRESSION
These devices feature patent-pending Adjacent Key
Suppression for use in applications where keys are tightly
spaced. If keys are very close and a large finger touches one
key, adjacent keys might also activate. AKS stops such false
detections by comparing relative signal levels among
channels and choosing the channel with the largest signal.
The AKS feature can be disabled via the AKS pin:
AKS=0: Disabled; AKS=1: Enabled
The AKS in these parts is a ‘global’ in nature, meaning that
the signal of each key is compared with all other keys, and
only the key with the strongest signal among all keys will
survive initial detection. The word ‘Adjacent’ therefore should
be taken liberally, as a particular key number can be
physically near any other key number and the AKS feature
will operate correctly.
When a touch is detected on a key, but just before the
corresponding OUT pin is activated, a check is made for a
pending or current detection on the other keys. If any other
key is active, or if a signal of greater strength is found on any
other key, the key detection is suppressed. Once the active
key(s) are released, a pending key is free to detect.
Drift compensation also ceases for any key which has been
suppressed, provided its signal exceeds its threshold level
(Figure 2-1).
AKS is also very effective on water films which bridge over
adjacent keys. When touching one key a water film will
‘transport’ the touch to the adjacent keys covered by the
same film. These side keys will receive less signal strength
than the key actually being touched, and so they will be
suppressed even if the signal they are detecting is large
enough to otherwise cause an output.
The downside of ‘global’ AKS is that it is not possible to have
more than one key active at a time.
When two or more devices are synchronized together and all
are using AKS mode, the AKS feature does not extend
beyond each chip. Therefore, in multi-chip configurations it is
possible to use AKS on all keys but still permit 2 or more
keys to detect at the same time.
2.4 SYNCHRONIZATION
Adjacent capacitive sensors that operate independently can
cross-interfere with each other in ways that will create
sensitivity shifts and spurious detections. Because
Quantum’s QT devices operate in burst mode as opposed to
continuous mode, the opportunity exists to solve this problem
by using time-sequencing of the sensing channels so that
physically adjacent channels do not sense within the same
lQ
7 QT140/150 1.01/1102

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