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QT100 Datasheet(PDF) 3 Page - Quantum Research Group

Part # QT100
Description  CHARGE-TRANSFER IC
Download  10 Pages
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Manufacturer  QUANTUM [Quantum Research Group]
Direct Link  http://www.qprox.com
Logo QUANTUM - Quantum Research Group

QT100 Datasheet(HTML) 3 Page - Quantum Research Group

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Figure 2.4 SYNC Mode (Short Pulses)
SNSK
QT100
SYNC
>10us
>10us
>10us
2.1.4 SYNC Mode
It is possible to synchronize the device to an external clock
source by placing an appropriate waveform on the SYNC pin.
SYNC mode can synchronize multiple QT100 devices to
each other to prevent cross-interference, or it can be used to
enhance noise immunity from low frequency sources such as
50Hz or 60Hz mains signals.
The SYNC pin is sampled at the end of each burst. If
the device is in Fast mode and the SYNC pin is
sampled high, then the device continues to operate in
Fast mode (Figure 2.2). If SYNC is sampled low, then
the device goes to sleep. From then on, it will operate in
SYNC mode (Figure 2.1). Therefore, to guarantee entry
into SYNC mode the low period of the SYNC signal
should be longer than the b urst length (Figure 2.3).
However, once SYNC mode has been entered, if the
SYNC signal consists of a series of short pulses
(>10µs) then a burst will only occur on the leading edge
of each pulse (Figure 2.4) instead of on each change of
SYNC signal, as normal (Figure 2.3).
In SYNC mode, the device will sleep after each
measurement burst (just as in LP mode) but will be
awakened by a change in the SYNC signal in either
direction, resulting in a new measurement burst. If
SYNC remains unchanged for a period longer than the
LP mode sleep period (about 70ms), the device will
resume operation in either Fast or LP mode depending
on the level of the SYNC pin (Figure 2.3).
There is no DI in SYNC mode (each touch is a
detection) but the Max On-duration will depend on the
time between SYNC pulses; see Sections 2.3 and 2.4.
Recalibration timeout is a fixed number of
measurements so will vary with the SYNC period.
2.2 Threshold
The internal signal threshold level is fixed at 10 counts
of change with respect to the internal reference level,
which in turn adjusts itself slowly in accordance with the
drift compensation mechanism.
The QT100 employs a hysteresis dropout of two counts
of the delta between the reference and threshold levels.
2.3 Max On-duration
If an object or material obstructs the sense pad the
signal may rise enough to create a detection, preventing
further operation. To prevent this, the sensor includes a
timer which monitors detections. If a detection exceeds
the timer setting the sensor perform s a full recalibration.
This is known as the Max On-duration feature and is set to
~60s. This will vary slightly with Cs and if SYNC mode is
used. As the internal timebase for Max On-duration is
determined by the burst rate, the use of SYNC can cause
dramatic changes in this parameter depending on the SYNC
pulse spacing.
2.4 Detect Integrator
It is desirable to suppress detections generated by electrical
noise or from quick brushes with an object. To accomplish
this, the QT100 incorporates a ‘detect integration’ (DI)
counter that increments with each detection until a limit is
reached, after which the output is activated. If no detection is
sensed prior to the final count, the counter is reset
immediately to zero. In the QT100, the required count is four.
In LP mode the device will switch to Fast mode temporarily in
order to resolve the detection more quickly; after a touch is
either confirmed or denied the device will revert back to
normal LP mode operation automatically.
The DI can also be viewed as a 'consensus' filter, that
requires four successive detections to create an output.
lQ
3
QT100-ISG R3.06/0606
Figure 2.3 SYNC Mode (triggered by SYNC edges)
SYNC
SYNC
SNSK
QT100
SNSK
QT100
slow mode sleep period
sleep
sleep
sleep
sleep
sleep
sleep
Revert to Fast Mode
Revert to Slow Mode
slow mode sleep period
Figure 2.2 Fast Mode Bursts (SYNC held high)
SNSK
QT100
SYNC
~1ms
Figure 2.1 Low Power Mode (SYNC held low)
SYNC
SNSK
QT100
sleep
sleep
sleep
fast detect
integrator
OUT
~70ms


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