qt240 Quantum Research Group, qt240 Datasheet - Page 10

• Manufacturer Part Number: qt240
• Description: 4 Key Qtouch? Sensor Ic
• Manufacturer: Quantum Research Group

4.5 Signal Processing
Vdd = 4.0V, Cx = 10pF, Cs = 10nF, Fosc = 100kHz, Ta = recommended range, unless otherwise noted
4.6 Mechanical Dimensions
lQ
Description
Threshold differential (positive)
Hysteresis
Fast negative threshold differential
Consensus filter length (Detection integrator)
Positive drift compensation rate
Negative drift compensation rate
Fast negative recalibration timer duration
Post-detection recalibration timer duration
SYMBOL
C’
G
A
B
C
D
E
H
F
!
Seating level
291.0
196.0
271.0
65.0
26.0
Min
9.0
4.0
4.0
0º
-
F
C
D
Inches (mils)
209 mil 20-pin SSOP Dimensions
10, 60, infinite
E
25.59
Typ
Value
1,000
C'
250
12
2
5
6
2
10
323.0
220.0
295.0
Max
15.0
73.0
10.0
34.0
8.0
samples
8º
ms/level
ms/level
-
counts
counts
counts
Units
secs
secs
B
A
Base level
From signal reference
From threshold
Nominal timing dependent on Fosc, Sync
Nominal timing dependent on Fosc, Sync
Nominal timing dependent on Fosc, Sync
Option pin selected;
Nominal timings; dependent on Fosc, Sync
7.39
4.98
0.23
6.88
1.65
0.10
0.66
0.10
Min
0º
-
ø
Metric (mm)
G
0.650
Notes
Typ
QT240R R1.11/1006
H
Max
8.20
5.59
0.38
7.49
1.85
0.25
0.86
0.20
8º
-