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QT1101 Schematic ( PDF Datasheet ) - QUANTUM

Teilenummer QT1101
Beschreibung 10 KEY QTOUCH SENSOR IC
Hersteller QUANTUM
Logo QUANTUM Logo 




Gesamt 16 Seiten
QT1101 Datasheet, Funktion
www.DataSheet4U.com
lQ
QT1101
10 KEY QTOUCH™ SENSOR IC
" Patented charge-transfer (‘QT’) design
" Ten independent QT sensing fields (keys)
" 2.8V ~ 5.5V single supply operation
" 40µA current typ @ 3V in 360ms LP mode
" 100% autocal for life - no adjustments required
" Serial one or two wire interface with auto baud rate
" Fully debounced results
" Patented AKS™ Adjacent Key Suppression
" Spread spectrum bursts for superior noise rejection
" Sync pin for excellent LF noise rejection
" ‘Fast mode’ for use in slider type applications
" RoHS compliant 32-QFN, 48-SSOP packages
24 23 22 21 20 19 18 17
SNS8
SNS8K
SNS9
SNS9K
N.C.
/CHANGE
1W
RX
25
26
27
28
29
30
31
32
QT1101
32-QFN
16 SNS5
15 SNS4K
14 SNS4
13 SNS3K
12 SNS3
11 SNS2K
10 SNS2
9 SNS1K
1 234 56 78
APPLICATIONS
! MP3 players
! Mobile phones
! PC peripherals
! Television controls
! Pointing devices
! Remote controls
QT1101 charge-transfer (‘QT’) QTouchTM IC is a self-contained, patented digital controller capable of detecting near-proximity or touch
on up to ten electrodes. It allows electrodes to project independent sense fields through any dielectric such as glass or plastic. This
capability coupled with its continuous self-calibration feature can lead to entirely new product concepts, adding high value to product
designs. The devices are designed specifically for human interfaces, like control panels, appliances, gaming devices, lighting controls,
or anywhere a mechanical switch or button may be found; they may also be used for some material sensing and control applications.
Each of the channels operates independently of the others, and each can be tuned for a unique sensitivity level by simply changing a
corresponding external Cs capacitor.
Patented AKS™ Adjacent Key Suppression suppresses touch from weaker responding keys and allows only a dominant key to detect,
for example to solve the problem of large fingers on tightly spaced keys.
Spread spectrum burst technology provides superior noise rejection. These devices also have a SYNC/LP pin which allows for
synchronization with additional similar parts and/or to an external source to suppress interference, or, an LP (low power) mode which
conserves power.
By using the charge transfer principle, this device delivers a level of performance clearly superior to older technologies yet is highly
cost-effective.
TA
-400C to +850C
LQ
AVAILABLE OPTIONS
32-QFN
QT1101-ISG
48-SSOP
QT1101-IS48G
CCopyright © 2005-2006 QRG Ltd
QT1101 R4.06/0806






QT1101 Datasheet, Funktion
2 Device Operation
2.1 Startup Time
After a reset or power-up event, the device requires 450ms
to initialize, calibrate, and start operating normally. Keys will
work properly once all keys have been calibrated after reset.
2.2 Option Resistors
The option resistors are read on power-up only. There are
two primary option mode configurations: f ull, and simplified.
In full options mode, seven 1Moption resistors are
required as shown in Figure 1.1. All seven resistors are
mandatory.
To obtain simplified mode, a 1Mresistor should be
connected from SNS6K to SNS7. In simplified mode, only
one additional 1Moption resistor is required for the AKS
feature (Figure 1.2).
Note that the presence and connection of option resistors
will influence the required values of Cs; this effect will be
especially noticeable if the Cs values are under 22nF. Cs
values should be adjusted for optimal sensitivity after the
option resistors are connected.
2.3 DETECT Pin
DETECT represents the functional logical-OR of all ten keys.
DETECT can be used to wake up a battery-operated product
upon human touch.
The output polarity and drive of DETECT are governed
according to Table 1.4, page 4.
2.4 /CHANGE Pin
The /CHANGE pin can be used to tell the host that a change
in touch state has been detected (i.e. a key has been
touched or released), and that the host should read the new
key states over the serial interface . /CHANGE is pulled low
when a key state change has occurred.
/CHANGE is very useful to prevent transmissions with
duplicate data. If /CHANGE is not used, the host would need
to keep polling the QT1101 constantly, even if there are no
changes in touch. Upon detection of a key, /CHANGE will
pull low and stay low until the serial interface has been
polled by the host. /CHANGE will then be released and
return high until the next change of key state, either on or off ,
on any key (Figures 2.1, 2.4).
The /CHANGE pin is open-drain, and requires a ~100K
pullup resistor to Vdd in order to function properly.
2.5 SYNC/LP Pin
The SYNC / LP pin function is configured according to the
SL_0 and SL_1 resistor connections to either Vdd or Vss ,
according to the Table 1.5.
Sync mode: Sync mode allows the designer to synchronize
acquire bursts to an external signal source, such as mains
frequency (50/60Hz), to suppress interference. It can also be
used to synchronize two QT parts which operate near each
other, so that they will not cross-interfere if two or more of
the keys (or associated wiring) of the two parts are near
each other.
The SYNC input is positive pulse triggered. If the SYNC input
does not change, the device will free-run at its own rate after
~150ms.
A trigger pulse on SYNC will cause the device to fire three
acquire bursts in A-B-C sequence:
Burst A: Keys 0, 1, 4, 5
Burst B: Keys 2, 3, 6, 7
Burst C: Keys 8, 9
Low Power (LP) Mode: This allows the device to enter a
slow mode with very low power consumption, in one of three
response time settings - 120ms, 200ms, and 360ms
nominal.
LP mode is entered by a positive pulse on the SYNC/LP pin.
Once the LP pulse is detected , the device will enter and
remain in this microamp mode until it senses and confirms a
touch, upon which it will switch back to normal (full speed)
mode on its own, with a response time of < 40ms typical
(burst length dependent). The device will go back to LP
mode again if SYNC/LP is held high or after another LP
pulse is received.
The response time setting is determined by option resistors
SL_1 and SL_0 (see Table 1.5). Slower response times
result in lower power drain.
The SYNC/LP pulse should be >150µs in duration.
If the SYNC/LP pin is held high permanently, the device will
go into normal mode during a key touch, and return to
low-current mode after the detection has ceased and the key
state has been read by the host.
If the SYNC/LP pin is held low constantly, the device will
remain in normal full speed mode continuously.
2.6 AKS™ Function Pins
The QT1101 features an adjacent key suppression ( AKS™)
function with two modes. Option resistors act to set this
feature according to Tables 1.2 and 1.6. AKS can be
disabled, allowing any combination of keys to become active
at the same time. When operating, the modes are:
Global: The AKS function operates across all ten keys. This
means that only one key can be active at any one time.
Groups: The AKS function operates among t hree groups of
keys: 0-1-4-5, 2-3-6-7, and 8-9. This means that up to
three keys can be active at any one time.
In Group mode, keys in one group have no AKS interaction
with keys in any other group.
Note that in Fast Detect mode, AKS can only be off.
2.7 MOD_0, MOD_1 Inputs
In full option mode, the MOD_0 and MOD_1 resistors are
used to set the 'Max On-Duration' recalibration timeouts. If a
key becomes stuck on for a lengthy duration of time, this
feature will cause an automatic recalibration event of that
specific key only once the specified on-time has been
exceeded. Settings of 10s, 60s, and infinite are available.
The Max On-Duration feature operates on a key -by-key
basis; when one key is stuck on, its recalibration has no
effect on other keys.
The logic combination on the MOD option pins sets the
timeout delay; see Table 1.3.
Simplified mode MOD timing: In simplified mode, the max
on-duration is fixed at 60 seconds.
Lq
6
QT1101 R4.06/0806

6 Page









QT1101 pdf, datenblatt
4.6 Idd Curves
Cx = 5pF, Cs = 4.7nF, Ta = 20oC, Spread spectrum circuit (see Fig. 1.1).
QT1101 Idd (norm al m ode) m A
5.0
4.0
3.0 Rb1=12K
Rb2=22K
2.0
Rb1=15K
Rb2=27K
1.0 Rb1=12K
Rb2=27K
0.0
2.5 3 3.5 4 4.5 5 5.5
Vdd(V)
QT1101 Idd (120m s response) µA
700
600
500
400 Rb1=12K
300 Rb2=22K
Rb1=15K
Rb2=27K
200
100 Rb1=12K
Rb2=27K
0
2.5 3 3.5 4 4.5 5 5.5
Vdd(V)
QT1101 Idd (200m s response) µA
400
300
Rb1=12K
200 Rb2=22K
Rb1=15K
Rb2=27K
100 Rb1=12K
Rb2=27K
0
2.5 3 3.5 4 4.5 5 5.5
Vdd(V)
QT1101 Idd (360m s response) µA
300
250
200 Rb1=12K
150 Rb2=22K
Rb1=15K
Rb2=27K
100
Rb1=12K
50 Rb2=27K
0
2.5 3 3.5 4 4.5 5 5.5
Vdd(V)
Cx = 5pF, Cs = 4.7nF, Ta = 20oC, No spread spectrum circuit (see Fig. 1.1).
QT1101 Idd (norm al m ode) m A
5.0
4.0
3.0 Rb1=20K
2.0
Rb1=18K
1.0 Rb1=15K
0.0
2.5 3 3.5 4 4.5 5
Vdd(V)
5.5
QT1101 Idd (120m s response) µA
600
500
400
300 Rb1=20K
200
100 Rb1=18K
Rb1=15K
0
2.5 3 3.5 4 4.5
Vdd(V)
5
5.5
QT1101 Idd (200m s response) µA
300
250
200
150 Rb1=20K
100
Rb1=18K
50
Rb1=15K
0
2.5 3 3.5 4 4.5 5 5.5
Vdd(V)
QT1101 Idd (360m s response) µA
150
125
100
75 Rb1=20K
50
Rb1=18K
25
Rb1=15K
0
2.5 3 3.5 4 4.5 5 5.5
Vdd(V)
lQ 12 QT1101 R4.06/0806

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