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부품번호 QT310 기능
기능 PROGRAMMABLE CAPACITANCE SENSOR IC
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QT310 데이터시트, 핀배열, 회로
LQ
QPROXQT310
PROGRAMMABLE CAPACITANCE SENSOR IC
Single channel digital advanced capacitance sensor IC
Spread spectrum burst modulation for high EMI rejection
Full autocal capability
User programmable via cloning process
Internal eeprom storage of user setups, cal data
Variable drift compensation & recalibration times
BG and OBJ cal modes for learn-by-example
Sync pins for daisy-chaining or noise suppression
Variable gain via Cs capacitor change
Selectable output polarity, high or low
Toggle mode (optional via setups)
Push-pull output
Completely programmable output behavior
via cloning process from a PC
HeartBeat™ health indicator (can be disabled)
APPLICATIONS
Fluid level sensors
Industrial panels
Appliance controls
Security systems
Access controls
Material detection
Micro-switch replacement Toys & games
This device requires only a few external passive parts to operate. It uses spread-spectrum burst modulation to dramatically
reduce interference problems.
The QT310 charge-transfer (“QT’”) touch sensor IC is a self-contained digital IC capable of detecting proximity, touch, or fluid
level when connected to a corresponding type of electrode. It projects sense fields through almost any dielectric, like glass,
plastic, stone, ceramic, and wood. It can also turn metal-bearing objects into intrinsic sensors, making them respond to
proximity or touch. This capability coupled with its ability to self calibrate continuously or to have fixed calibration by example
can lead to entirely new product concepts.
It is designed specifically for advanced human interfaces like control panels and appliances or anywhere a mechanical switch
or button may be found; it can also be used for material sensing and control applications, and for point-level fluid sensing.
The ability to daisy-chain permits electrodes from two or more QT310’s to be adjacent to each other without interference. The
burst rate can be programmed to a wide variety of settings, allowing the designer to trade off power consumption for response
time.
The IC’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. All operating parameters can be
user-altered via Quantum’s cloning process to alter sensitivity, drift compensation rate, max on-duration, output polarity,
calibration mode, Heartbeat™ feature, and toggle mode. The settings are permanently stored in onboard eeprom.
The Quantum-pioneered HeartBeat™ signal is also included, allowing a host controller to monitor the health of the QT310
continuously if desired.
By using Quantum’s advanced, patented charge transfer principle, the QT310 delivers a level of performance clearly superior
to older technologies yet is highly cost-effective.
LQ
AVAILABLE OPTIONS
TA
00C to +700C
-400C to +850C
SOIC
-
QT310-IS
8-PIN DIP
QT310-D
-
Copyright © 2002 QRG Ltd
QT310/R1.03 21.09.03




QT310 pdf, 반도체, 판매, 대치품
of the QT310, sensitivity can be high enough (depending on
Cx and Cs) that 'walk-by' signals are a concern; if this is a
problem, then some form of rear shielding may be required.
1.4 SENSITIVITY ADJUSTMENTS
There are three variables which influence sensitivity:
1. Cs (sampling capacitor)
2. Cx (unknown capacitance)
3. Signal threshold value
There is also a sensitivity dependence of the whole device on
Vdd. Cs and Cx effects are covered in Section 1.2.1.
The threshold setting can be adjusted independently from 1 to
255 counts of signal swing (Section 2.3).
Note that sensitivity is also a function of other things like
electrode size, shape, and orientation, the composition and
aspect of the object to be sensed, the thickness and
composition of any overlaying panel material, and the degree
of mutual coupling of the sensor circuit and the object (usually
via the local environment, or an actual galvanic connection).
Figure 1-5 Shielding Against Fringe Fields
A ‘virtual capacitive ground’ can be created by connecting the
QT310’s own circuit ground to:
(1) A nearby piece of metal or metallized housing;
(2) A floating conductive ground plane;
(3) A fastener to a supporting structure;
(4) A larger electronic device (to which its output might be
connected anyway).
Because the QT310 operates at a relatively low frequency,
about 500kHz, even long inductive wiring back to ground will
usually work fine.
Free-floating ground planes such as metal foils should
maximise 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.
Threshold levels of less than 5 counts in BG mode are not
advised; if this is the case, raise Cs so that the threshold can
also be increased.
1.4.1 INCREASING SENSITIVITY
In some cases it may be desirable to greatly increase
sensitivity, for example when using the sensor with very thick
panels having a low dielectric constant, or when sensing low
capacitance objects.
Sensitivity can be increased by using a bigger electrode,
reducing panel thickness, or altering panel composition.
Increasing electrode size can have diminishing returns, as
high values of Cx load will also reduce sensor gain (Figures
5-1 and 5-2). The value of Cs also has a dramatic effect on
sensitivity, and this can be increased in value up to a limit.
Increasing electrode surface area will not substantially
increase sensitivity if its area is already larger than the object
to be detected. The panel or other intervening material can be
made thinner, but again there are diminishing rewards for
1.3.4 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 can be on the same or
opposite side from the electrode. The ring will kill 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-by’ and 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 a
small air gap between the grounded shield and the electrode
will keep the value of Cx lower and is encouraged. In the case
Figure 1-6 Burst Detail
LQ
4 QT310/R1.03 21.09.03

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QT310 전자부품, 판매, 대치품
2.2.1 NEGATIVE DRIFT COMPENSATION (NDC)
Range: 0..255; Default: 2; 255 disables
Compensation for drift with decreasing Cx
NDC corrects the reference when the internal signal is drifting
up, i.e. Cx is decreasing (see Section 2.8.1). Every interval of
time the device checks for the need to move its reference
level in the positive internal direction (negative Cx direction) in
accordance with signal drift. The resulting timing interval for
this adjustment is Tndc.
This should normally be faster than positive drift
compensation in order to compensate quickly for the removal
of a touch or obstruction from the electrode after a MOD
recalibration (Section 1.5.3).
Use NDC+1 to compute actual drift timings.
2.2.2 POSITIVE DRIFT COMPENSATION (PDC)
Range: 0...255 Default: 100; 255 disables
Compensation for drift with increasing Cx
This corrects the reference when the signal drifting down, i.e.
Cx is increasing (see Section 2.8.1). Every interval of time the
device checks for the need to move its reference level in the
negative internal direction (positive Cx direction) in
accordance with signal drift. The resulting timing interval for
this adjustment is Tpdc.
This value should not be set too fast, since an approaching
finger could be compensated for partially or entirely before
even touching the sense electrode.
Use PDC+1 to compute actual drift timings.
2.3 THRESHOLD (THR)
Range: 1..255; Default: 6
Affects sensitivity; not used in OBJ mode.
The detection threshold is measured in terms of counts of
signal deviation with respect to the reference level. Higher
threshold counts equate to less sensitivity since the signal
must travel further in order to cross the detection point.
If the signal equals or exceeds the threshold value, a
detection can occur. The detection will end only when the
signal become less than the hysteresis
level.
THR is not used in OBJ mode (Section
2.8.5). In OBJ mode the threshold is set by
example during calibration.
Hysteresis should be set to between 10% and 40% of the
threshold value for best results.
If HYS is set to 0, there will be no hysteresis (0%).
If THR = 10 and HYS = 2, the hysteresis zone will represent
20% of the threshold level. In this example the ‘hysteresis
zone’ is the region from 8 to 10 counts of signal level. Only
when the signal falls back to 7 will the OUT pin become
inactive.
2.5 DETECT INTEGRATORS (DIA, DIB, DIS)
DIAT
Range: 1..256 Default: 10
DIBT
Range: 1..256 Default: 10
DIS Range: 0, 1 Default: 1
Affects response time Tdet.
See Figure 2-2 for operation.
It is usually desirable to suppress detections generated by
sporadic electrical noise or from quick contact with an object.
To accomplish this, the QT310 incorporates a pair of
detection integrator (‘DI’) counters that serve to filter out
sporadic noise. These counters can also have the effect of
slowing down response time if desired.
DI counters act as a powerful noise filter.
These DI counters work with spread-spectrum modulation to
drastically suppress the effects of external RFI. See page 13
for details.
DIA / DIAT: The first counter, DIA, increments after each
burst if the signal threshold has been exceeded, until DIA
reaches its terminal count DIAT, after which the OUT pin is
activated. If the signal falls below the threshold level prior to
reaching DIAT, DIA is immediately reset to zero.
DIA can also be viewed as a 'consensus' filter that requires
signal threshold crossings over ‘T’ successive bursts to create
an output, where ‘T’ is the terminal count (DIAT).
DIB / DIBT: If OUT has been active and the signal falls below
the hysteresis level, a second detection integrator, DIB,
counts up.
When DIBT is reached, OUT is deactivated.
2.4 HYSTERESIS (HYS)
Range: 0...255; Default: 2; 0 disables
Affects detection stability.
Hysteresis is measured in terms of counts
of signal deviation relative to the threshold
level. Higher values equate to more
hysteresis. The device will become inactive
after a detection when the Cx level moves
below THR-HYS in normal mode or above
THR+HYS in absence mode (Section2.8.2)
Hysteresis helps prevents chattering of the
OUT pin.
If HYS is set to a value equal or greater than
THR, the device may malfunction.
Figure 2-2 Detect Integrators Operation (Section 2.5)
LQ
7 QT310/R1.03 21.09.03

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