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QT100 데이터시트 PDF




QUANTUM에서 제조한 전자 부품 QT100은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 QT100 기능
기능 CHARGE-TRANSFER IC
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QT100 데이터시트, 핀배열, 회로
www.DataSheet4U.com
LQ
QT100
CHARGE-TRANSFER QTOUCHIC
! 2V to 5V single supply operation
! 10µA low power mode @ 2V
! Self-calibrating on power-up
! Sensitivity easily adjusted
! Consensus filter for noise immunity
! Autorecalibration timeout
! HeartBeat™ health indicator on output
! Only a few passive external parts required
! RoHS compliant SOT23-6 package
OUT 1
VSS 2
SNSK 3
6 SYNC/MODE
5 VDD
4 SNS
The QT100 charge-transfer (‘QT’) touch sensor is a self-contained digital IC capable of detecting near-proximity or touch. It will
project a touch or proximity field through any dielectric like glass, plastic, stone, ceramic, and even 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, 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.
Power consumption is less than 500µA in most applications when running in Fast response mode. This typically drops to
5-10µA at 2V VDD in Low Power mode, depending on the burst length. In most cases the power supply need only be minimally
regulated; for example, by Zener diodes or an inexpensive three-terminal regulator. The QT100 only requires a common
inexpensive X7R ceramic capacitor in order to function.
The QT100’s Reduced Instruction Set Computer ( RISC) core employs signal processing techniques pioneer ed by Quantum;
these are specifically designed to make the device survive real-world challenges, such as ‘stuck sensor’ conditions and signal
drift.
The Quantum-pioneered HeartBeat™ signal is also included, allowing a microcontroller to monitor the health of the QT100
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.
LQ
AVAILABLE OPTIONS
TA
-40ºC to +85ºC
6-pin SOT23-6
QT100-ISG
CCopyright © 2006 QRG Ltd
QT100-ISG R3.06/0606




QT100 pdf, 반도체, 판매, 대치품
2.5 Forced Sensor Recalibration
The QT100 has no recalibration pin; a forced
recalibration is accomplished when the device is
powered up or after the recalibration timeout .
However, supply drain is low so it is a simple
matter to treat the entire IC as a controllable load;
driving the QT100's VDD pin directly from another
logic gate or a microcontroller port will serve as
both power and 'forced recal'. The source
resistance of most CMOS gates and
microcontrollers are low enough to provide direct
power without problem.
Figure 2.5 Drift Compensation
S ig n a l
H ysteresis
T hr e s h o ld
R eference
2.6 Drift Compensation
Output
Signal drift can occur because of changes in Cx
and Cs over time. It is crucial that drift be
compensated for, otherwise false detections, nondetections,
and sensitivity shifts will follow.
2.7 Response Time
The QT100's response time is highly dependent on run mode
Drift compensation (Figure 2.5) is performed by making the
reference level track the raw signal at a slow rate, but only
while there is no detection in effect. The rate of adjustment
must be performed slowly, otherwise legitimate detections
could be ignored. The QT100 drift compensates using a
and burst length, which in turn is dependent on Cs and Cx.
With increasing Cs, response time slows, while increasing
levels of Cs reduce response time. The response time will
also be a lot slower in LP or SYNC mode due to a longer time
between burst measurements.
slew-rate limited change to the reference level; the threshold
and hysteresis values are slaved to this reference .
2.8 Spread Spectrum
Once an object is sensed, the drift compensation mechanism
ceases since the signal is legitimately high , and therefore
should not cause the reference level to change.
The QT100's drift compensation is 'asymmetric'; the
reference level drift-compensates in one direction faster than
The QT100 modulates its internal oscillator by ±7.5% during
the measurement burst. This spreads the ge nerated noise
over a wider band reducing emission levels. This also
reduces susceptibility since there is no longer a single
fundamental burst frequency.
it does in the other. Specifically, it compensate s faster for
decreasing signals than for increasing signals. Increasing
2.9 Output Features
signals should not be compensated for quickly, since an
approaching finger could be compensated for partially or
entirely before even approaching the sense electrode.
However, an obstruction over the sense pad, for which the
sensor has already made full allowance, could suddenly be
removed leaving the sensor with an artificially elevated
reference level and thus become insensitive to touch. In this
latter case, the sensor will compensate for the object's
2.9.1 Output
The output of the QT100 is active-high upon detection. The
output will remain active-high for the duration of the
detection, or until the Max On-duration expires, whichever
occurs first. If a Max On-duration timeout occurs first, the
sensor performs a full recalibration and the output becomes
inactive (low) until the next detection.
removal very quickly, usually in only a few seconds.
With large values of Cs and small values of Cx, drift
compensation will appear to operate more slowly than with
the converse. Note that the positive and negative drift
compensation rates are different.
Figure 2.6
Getting HeartBeat pulses with a pull-up resistor
HeartBeat™ Pulses
2 ~ 5V
5
Ro
1 VDD 3
OUT
SNSK
4
SNS
6
SYNC/MODE
VSS
2
Figure 2.7
Using a micro to obtain HeartBeat pulses in either output state
P ORT_M.x
Ro
Microcontroller
P ORT_M.y
1
OUT
3
SNSK
4
SNS
6
S Y N C /MOD E
lQ
4 QT100-ISG R3.06/0606

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QT100 전자부품, 판매, 대치품
4.5 DC Specifications
VDD = 3.0V, Cs = 10nF, Cx = 5pF, Ta = recommended range, unless otherwise noted
Parameter
Description
Min Typ Max
VDD
IDD
VDDS
VIL
VHL
VOL
VOH
IIL
CX
AR
Supply voltage
Supply current
Supply turn-on slope
Low input logic level
High input logic level
Low output voltage
High output voltage
Input leakage current
Load capacitance range
Acquisition resolution
2
5
100
2.2
VDD-0.7
0
9
5.25
600
0.8
0.6
±1
100
14
Units
V
µA
V/s
V
V
V
V
µA
pF
bits
Notes
Depending on supply and run mode
Required for proper start-up
OUT, 4mA sink
OUT, 1mA source
lQ
7 QT100-ISG R3.06/0606

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