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QT1106-ISG Schematic ( PDF Datasheet ) - QUANTUM

Teilenummer QT1106-ISG
Beschreibung QWHEEL/QSLIDE/QTOUCH IC
Hersteller QUANTUM
Logo QUANTUM Logo 




Gesamt 20 Seiten
QT1106-ISG Datasheet, Funktion
www.DataSheet4U.com
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






QT1106-ISG Datasheet, Funktion
Table 2.2 Pinlist
32-QFN
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Name
SPREAD
/RST
Vdd
OSC
n/c
CHANGE
SNSB7
SNSB6
SNSB5
SNSB
SNSB
SNSB
SNSB
SNSB4
SNSB3
SNSB2
SNSB1
SNSB
SNSB
SNSB
DRDY
Vss
SCLK
/SS
MOSI
MISO
SNSA
SNSA
SNSA
SNSA1
SNSA2
SNSA3
Type
OD
I
Pwr
I
-
OF
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
OF
Pwr
I
I
I
OF
I/O
I/O
I/O
I/O
I/O
I/O
Function
Spread-spectrum drive
Reset input
Power
Oscillator current drive
-
State change notification
To CSB7
To CSB6
To CSB5
To any CSB + Key
To any CSB + Key
To any CSB + Key
To any CSB + Key
To CSB4
To CSB3
To CSB2
To CSB1
To any CSB + Key
To any CSB + Key
To any CSB + Key
SPI Data Ready
Ground
SPI Clock
SPI Slave Select in
SPI Master Out /Slave In
SPI Master In / Serial Out
To any CSA + wheel/slider
To any CSA + wheel/slider
To any CSA + wheel/slider
To CSA1
To CSA2
To CSA3
Notes
-
Active low reset
+2.8 to +5.0V
Resistor to Vdd and optional
spread-spectrum RC network
Leave open
To host
Sense pin
Sense pin
Sense pin
Sense pin
Sense pin
Sense pin
Sense pin
Sense pin
Sense pin
Sense pin
Sense pin
Sense pin
Sense pin
Sense pin
SPI handshake line
-
SPI serial bit clock
-
Data from host to QT1106
Data from QT1106 to host
Sense pin
Sense pin
Sense pin
Sense pin position 43
Sense pin position 85
Sense pin position 0
Pin Type
I/O
I
OD
OF
Pwr
CMOS input/output
CMOS input only
CMOS open drain output (pull up to Vdd)
CMOS output that can float during Reset, Sleep or LP modes
Power / ground
If Unused
Open
Vdd
-
-
-
-
Open
Open
Open
Open
Open
Open
Open
Open
Open
Open
Open
Open
Open
Open
-
-
-
Open
-
-
Open
Open
Open
Open
Open
Open
Note: Sense terminals can be twinned with any sense drive terminals of the same group, e.g. SNSA1 can be paired with any
SNSA terminal.
Lq
6 QT1106-ISG R8I.05/0906

6 Page









QT1106-ISG pdf, datenblatt
Command During LP Mode: First read ‘/SS Wake Pulse in
LP Mode’, on Page 11. Following DRDY rising at the end of
the 45µs low pulse, the host may perform a normal SPI
transfer as shown in Figure 3.1. The SPI transfer may start
while DRDY is high (450µs), and for a 20µs grace period
thereafter.
After the SPI transfer is completed, the QT1106 will generate
a set of three acquire bursts if LPB=1, during which DRDY
will be low.
The mode and options settings sent from the host to the
QT1106 during the SPI transfer take effect after the set of
acquire bursts.
# If Free Run mode is selected, the QT110 6 will take
DRDY high to indicate the possibility of an SPI transfer.
# If either LP mode or Sleep mode is selected, the
QT1106 will go back to sleep with DRDY high provided
no key is detected as possibly touched.
# If Sync mode is selected, the QT1106 will go back to
sleep with DRDY high provided no key is detected as
possibly touched.
The CHANGE pin will go high at this time if a key is
confirmed as touched.
4.4 Sleep Mode
Sleep mode offers the lowest possible current drain, in the
low microamp region.
Sleep mode is a special case of LP mode, where the sleep
duration between bursts is infinite. All comments concerning
LP mode, including about SPI communications , apply
equally to Sleep mode, except that the LPB bit is ignored
and bursts are always generated after an SPI transfer or
/SS wake pulse as if LPB=1.
Note that in Sleep mode the QT1106 only performs
acquisition bursts following being woken by /SS. This has
two effects.
# Touch detection only occurs following /SS-wake pulses,
and hence CHANGE can only go high at that time.
# The QT1106 cannot drift its internal references unless
the host sends periodic /SS wake pulses. If the host
does not do this, then it should command the QT110 6 to
recalibrate when it sets the QT1106 into a different
operating mode.
This mode can be used by the host to create its own ‘LP
Mode’ timings via the /SS wakeup pulse method.
4.5 Sync Mode
This mode is useful for low frequency noise suppression, for
example from mains frequencies in line-operated appliances.
Acquisition bursts are synchronized to the /SS-wake pulses
from the host.
Sync mode is very similar to ‘LP 760ms response time’
mode, with two differences:
# It does not operate as in Free Run mode when a touch
is first detected
# The LPB bit is ignored and a burst is always generated
after each /SS wakeup or SPI transfer as if LPB=1
Not operating as in Free Run mode when a touch is first
detected (before DI confirmation has taken place) means
that acquisition bursts are restricted to the immediate time
after a sync signal (/SS), heightening the effect of low
frequency noise suppression.
In many applications of Sync mode the DI filter will need to
be set to two counts, to avoid the QT1106 response time
being unacceptably lengthened as a consequence of this.
Figure 4.2 LP Mode SPI Operation with LPB=0
Acquire Bursts
No SPI Communication
>40us
<150us
DRDY from QT
<100us
/SS from host
>125us
SPI Communication
>70us
<200us
<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
don't care
don't care
don't care
command bytes
response bytes
don't care
3-state
Lq
12 QT1106-ISG R8I.05/0906

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