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PDF QT1106-ISG Data sheet ( Hoja de datos )
| Número de pieza | QT1106-ISG | |
| Descripción | QWHEEL/QSLIDE/QTOUCH IC | |
| Fabricantes | QUANTUM | |
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lQ
QT1106-ISG
QWHEEL™/QSLIDE™/QTOUCH™ IC
" Patented charge-transfer (‘QT’) design
" Wheel or Slider plus seven extra keys
" QMagic™ proximity effect for ‘approach on’ function
" Fast thermal drift tracking
" 2.8V ~ 5.0V single supply operation
" 100% autocal for life - no adjustments required
" SPI five-wire interface
" Fully debounced results
" Patented AKS™ Adjacent Key Suppression
" Spread-spectrum bursts for superior noise rejection
" RoHS compliant 32-QFN package
24 23 22 21 20 19 18 17
MOSI
MISO
SNSA
SNSA
SNSA
SNSA1
SNSA2
SNSA3
25
26
27
28
29
30
31
32
QT1106
32-QFN
16 SNSB2
15 SNSB3
14
13 SNSB
12 SNSB
11 SNSB
10 SNSB
9 SNSB5
1 234 56 78
APPLICATIONS
! MP3 players
! Mobile phones
! PC peripherals
! Appliance controls
! Remote controls
QT1106 charge-transfer (‘QT’) QTouchTM IC is a self-contained, patented charge-transfer capacitive controller capable of
detecting near-proximity or touch on up to seven electrodes and a wheel. It allows electrodes to project sense fields through
any dielectric such as glass or plastic. These electrodes are laid out as a scroller (e.g. a wheel or slider) plus seven
additional independent keys. Each key channel can be tuned for a unique sensitivity level by simply changing a corresponding
external Cs capacitor, whereas the wheel/slider’s sensitivity can be changed dynamically through SPI commands.
The wheel/slider uses a simple, inexpensive sensing element between three connection points. The QT1106 can report a
single rapid touch anywhere along the sense elements, or it can track a finger moving along the wheel/slider’s surface in real
time.
The device is designed specifically for human interfaces, like control panels, appliances, gaming devices, lighting controls,
remote controls, or anywhere a mechanical wheel, slider, or switch may be found.
Patented AKS™ Adjacent Key Suppression suppresses touch from weaker responding keys and only allows a dominant key to
detect; for example, to solve the problem of large fingers on tightly spaced keys or buttons in the middle of a wheel.
By using the charge-transfer principle, this device delivers a level of performance clearly superior to older technologies yet
is highly cost-effective. Spread-spectrum burst technology provides superior noise rejection. The device also has a Sync mode
which enables synchronization with additional similar parts and/or to an external source to suppress interference, and low
power modes which conserve power.
AVAILABLE OPTIONS
TA
-400C to +850C
32-QFN
QT1106-ISG
LQ
CCopyright © 2006 QRG Ltd
QT1106-ISG R8I.05/0906
1 page  
2.6 QMagicTM Proximity Sensor
Key 7 (SNSB7) can be optimized for operation as a hand
proximity sensor via the serial interface (see Section 3.5.2,
Prox = 1). The proximity sensitivity of channel 7 can be
increased by a higher value of Cs. The AKS mode should be
set to mode 101, to ensure that the proximity key does not
lock out other keys or the wheel/slider.
Note that proximity fields are often unstable especially in
products that can move around, such as mobile phones and
MP3 players. In particular, the proximity channel can stick on
after a detection. As soon as possible after proximity
channel 7 becomes active, it should be recalibrated via the
serial interface (see Section 3.5.2, CalK = 1, Cal Key Num
bits = 111) in order to clear the proximity channel .
Design of proximity electrodes requires care, so as to ensure
that the electrode area is maximized whilst ensuring
adequate and easy coupling to a hand as it approaches the
equipment.
2.7 Faulty and Unused Keys
Any sense channel that does not have its sense capacitor
(Cs) fitted is assumed to be either faulty or unused. This
channel takes no further part in operation unless a
host-commanded recalibration operation shows it to have an
in-range burst count again.
This is important for sense channels that have a n open or
short circuit fault across Cs. Such channels would otherwise
cause very long acquire bursts, and in consequence would
slow the operation of the entire QT1106.
Lq
5 QT1106-ISG R8I.05/0906
5 Page 
W: The state of the wheel/rotor. A ‘1’ means the wheel/slider
is confirmed as being touched.
Position: The position of touch on the wheel/slider. If the
wheel/slider is not being touched, the position will be the
position of the last touch.
4 Operating Modes
4.1 Introduction
Four basic operating modes are possible: Free Run, LP (Low
Power), Sync and Sleep. Sleep is a special case of LP
mode, where the sleep time is infinite. Sync is a special case
of LP mode which acts as a noise filter over successive /SS
pulses rather than temporarily operating as in Free Run
mode.
4.2 Free Run Mode
In this mode the device operates continuously with short
intervals between burst groups; there are three bursts, one
burst for each electrode group. Between burst sets, DRDY
goes high for 450µs to allow SPI communications.
In this mode, the acquisition bursts are unsynchronized,
making this mode unsuitable if synchronization to mains
frequency is needed.
4.3 LP Mode
LP mode is designed to allow low power operation while still
retaining basic operation but at a slower speed. This mode is
useful for devices that must use the touch keys to wake up a
product, yet be in a low power mode.
Several LP timings allow the user to trade power versus
response time: the slower the response time, the lower the
power consumed.
In LP mode, the device spends most of the time sleeping
between bursts; it wakes itself periodically to do a set of
three acquisition bursts, then goes back to sleep. If a touch
is detected, the device operates as in Free Run mode and
attempts to perform the DI (detect integrator noise filter)
function to completion; if the DI filter fails to confirm a
detection the device goes back to sleep and resumes LP
mode. During the DI function the LPS bit will be cleared.
If a key is found to be in detection the CHANGE pin will go
high and the part will remain in Free Run mode. To go back
into LP mode the host has to request LP mode again.
CHANGE Pin in LP Mode: During the sleep portion of LP
mode, CHANGE is held low.
If however a change of key state is confirmed, CHANGE
goes high and the part runs from then on in Free Run mode
until the host reads the key state and puts the device back
into LP mode or some other mode.
MISO in LP Mode: During the sleep portion of LP mode,
MISO floats.
DRDY during LP Mode: DRDY remains high while the
QT1106 is sleeping, to indicate to the host that SPI
communications are possible . In LP mode, the host should
wake the QT1106 using a pulse on /SS before transferring
data over SPI (see below). During an actual acquire burst,
DRDY is held low.
/SS Wake Pulse in LP Mode: In LP mode the host should
wake the device from sleep using a low pulse on /SS. The
pulse should be at least 1 25µs wide.
Within 100µs of the end of the /SS pulse, the QT1106 will
take DRDY low for at least 40µs to indicate that it has
received the /SS wake pulse.
Following the >45µs DRDY low pulse, the host can
communicate normally with the device (see ‘Command
During LP Mode’ on Page 12).
If the LPB bit (page 9) is set, the device will then perform a
set of acquire bursts during which DRDY will be low.
Provided no key is detected as being touched during that
burst, the QT1106 will go back to sleep, leaving DRDY high.
The CHANGE pin can go high if a key state changes during
the burst(s) following the wake pulse.
If a key is confirmed as touched, the device will transition to
Free Run mode automatically.
Figure 4.1 LP Mode SPI Operation with LPB=1
No SPI Communication
Acquire Bursts
>40us
<150us
DRDY from QT
~23ms
>450us
<100us
<240us
<20us
(grace period)
/SS from host
>125us
SPI Communication
~23ms
<240us
<470us
/SS timing as left
SCLK from Host
don't care
Host Data Output
(QT1106 Input - MOSI)
don't care
QT Data Output
(QT1106 Out - MISO)
3-state
Lq
don't care
don't care
11
don't care
command bytes
response bytes
don't care
3-state
QT1106-ISG R8I.05/0906
11 Page | ||
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| PDF Descargar | [ Datasheet QT1106-ISG.PDF ] | |
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