QT140-DG Atmel, QT140-DG Datasheet - Page 11
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QT140-DG
Manufacturer Part Number
QT140-DG
Description
IC SENSOR 4KEY 5V 5MA SGL 28DIP
Manufacturer
Atmel
Series
QProx™, QTouch™r
Type
Capacitiver
Datasheet
1.QT140-D.pdf
(14 pages)
Specifications of QT140-DG
Touch Panel Interface
10, 2-Wire
Number Of Inputs/keys
4 Key
Resolution (bits)
10, 14 b
Voltage Reference
Internal
Voltage - Supply
3 V ~ 5.5 V
Current - Supply
2.5mA
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Output Type
*
Interface
*
Input Type
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
4.5 SIGNAL PROCESSING
lQ
Description
Threshold differential
Hysteresis
Consensus filter length (Detection integrator)
Positive drift compensation rate
Negative drift compensation rate
Post-detection recalibration timer duration
18000
16000
14000
12000
10000
8000
6000
4000
2000
0
0
10
Burst Duration v s. Cs, Cx
Figure 4-1
20
Cx
18000
16000
14000
12000
10000
8000
6000
4000
2000
30
0
0
40
50
50
All curves at Vdd = 5.0V
10, 60, infinite
Cs = 220nF
Cs = 100nF
Cs = 47nF
Cs = 39nF
Cs = 22nF
Cs = 10nF
Burst Duration cs. Cs, Cx
Value
100
990
231
6
2
3
Figure 4-3
Cs, nF
11
150
samples
ms/level
ms/level
counts
counts
Units
secs
4000
3500
3000
2500
2000
1500
1000
500
0
0
200
From signal reference
From threshold
Option pin selected
10
Burst Duration v s. Cs, Cx
Figure 4-2
250
20
Cx
Cx = 5pF
Cx = 10pF
Cx = 15pF
Cx = 22pF
Cx = 33pF
Cx = 47pF
30
Notes
QT140/150 1.01/1102
40
50
Cs = 47nF
Cs = 39nF
Cs = 22nF
Cs = 10nF