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QT1080 Schematic ( PDF Datasheet ) - QUANTUM

Teilenummer QT1080
Beschreibung 8 KEY QTOUCH SENSOR IC
Hersteller QUANTUM
Logo QUANTUM Logo 




Gesamt 16 Seiten
QT1080 Datasheet, Funktion
www.DataSheet4U.com
lQ
QT1080
8 KEY QTOUCH™ SENSOR IC
" Eight completely independent QT touch sensing fields
" Designed for low-power portable applications
" 100% autocal for life - no adjustments required
" Direct outputs - either encoded or ‘per key’
" Fully debounced results
" 2.8V to 5.0V single supply operation
" 45µA current typ @ 3V in 360ms LP mode
" AKS™ Adjacent Key Suppression
" Spread spectrum bursts for superior noise rejection
" Sync pin for excellent LF noise rejection
" 10ms ‘Fast mode’ for use in slider applications
" RoHS compliant packages: 32-QFN and 48-SSOP
24 23 22 21 20 19 18 17
OUT_0
OUT_1
OUT_2
OUT_3
OUT_4
OUT_5
OUT_6
OUT_7
25
26
27
28
29
30
31
32
QT1080
32-QFN
16 SNS5
15 SNS4K
14 SNS4
13 SNS3K
12 SNS3
11 SNS2K
10 SNS2
9 SN1K
1 234 56 78
APPLICATIONS
! MP3 players
! Mobile phones
! PC peripherals
! Television controls
! Pointing devices
! Remote controls
QT1080 charge-transfer (’QT’) QTouch IC is a self-contained digital controller capable of detecting near-proximity or touch on
up to eight 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.
AKS™ Adjacent Key Suppression (patent pending) 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.
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, a Low Power (LP) 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.
This part is available in both 32-QFN and 48-SSOP RoHS compliant packages.
TA
-40ºC to +85ºC
LQ
AVAILABLE OPTIONS
32-QFN
QT1080-ISG
48-SSOP
QT1080-IS48G
Copyright © 2004-2006 QRG Ltd
QT1080 R11.06/0806






QT1080 Datasheet, Funktion
Figure 1.2 Connection Diagram - Simplified Mode; Shown for 32-QFN
SMR resistor installed between SNS6K and SNS7.
Vunreg
*4.7uF
+2.8 ~ +5V
Voltage Reg
*4.7uF
VDD
*100nF
KEY 3
KEY 4
KEY 5
KEY 6
KEY 7
RSNS3 4.7nF
10K
RSNS4 4.7nF
10K
RSNS5 4.7nF
10K
RSNS6 4.7nF
10K
RSNS7 4.7nF
10K
RS3
CS3 2.2K
RS4
CS4 2.2K
RS5
CS5 2.2K
RS6
CS6 2.2K
RS7
SMR
CS7 2.2K
32
VDD
12 SNS3
13 SNS3K
SNS4
15 SNS4K
16 SNS5
17 SNS5K
18 SNS6
19 SNS6K
/RST
SNS2K 11
SNS2 10
SNS1K 9
SNS1 8
SNS0K 7
SNS0 6
1M
VDD
AKS_0
Vdd / Vss
RS2
2.2K
RS1
2.2K
RS0
2.2K
4.7nF
RSNS2
CS2
4.7nF
10K
RSNS1
CS1
4.7nF
10K
RSNS0
10K
CS0
Recommended Rb1, Rb2 Values
KEY 2
KEY 1
KEY 0
1M 20 SNS7
21 SNS7K
Rb1
OSC 4
Vdd Range
2.8 ~ 3.59V
3.6 ~ 5V
Rb1
12K
15K
Rb2
22K
27K
QT1080
32-QFN
Rb2 The required value of spread-spectrum capacitor CSS
will vary according to the lengths of the acquire bursts,
see Section 3.2. A typical value of CSS is 100nF.
LP IN
DETECT OUT
22
VSS
23
SYNC/LP
24 DETECT
SS 1
OUT_7 32
OUT_6 31
OUT_5 30
OUT_4 29
OUT_3 28
OUT_2 27
OUT_1 26
OUT_0 25
CSS
OUT_7
OUT_6
OUT_5
OUT_4
OUT_3
OUT_2
OUT_1
OUT_0
Table 1.6
AKS Resistor Options
AKS_0
Vss
Vdd
AKS MODE
Off
On, global
FAST-DETECT
Enabled
Off
Table 1.7
Functions in Simplified Mode
Output Drive, Polarity
SYNC/LP pin
Max on-duration delay
Detect Pin
Direct outputs, push-pull, active high
200ms nom LP function; sync not available
60 seconds (nom)
Active high on any detect
lQ
6
QT1080 R11.06/0806

6 Page









QT1080 pdf, datenblatt
4.7 LP Mode Typical Response Times
Response Time vs Vdd - 110ms Setting
130
125
120
115
110
105
100
95
90
2.5 3 3.5 4 4.5 5
Vdd
5.5
Response Time vs Vdd - 200ms Setting
240
230
220
210
200
190
180
170
160
2.5 3 3.5 4 4.5 5
Vdd
Response Time vs Vdd - 360ms Setting
430
410
390
370
350
330
310
290
2.5 3 3.5 4 4.5 5
Vdd
5.5
5.5
lQ
12
QT1080 R11.06/0806

12 Page





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