QST608 ST Microelectronics, QST608 Datasheet - Page 32

• Manufacturer Part Number: QST608
• Description: Capacitive touch sensor device
• Manufacturer: ST Microelectronics

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Electrical characteristics
6.5
32/44
Capacitive sensing characteristics
Table 19.
Table 20.
PosRecalTh
PosRecalTh
MaxOnDuration
EofDeTh
EofDeTh
NegComDrift
PosComDrift
NegDiffDrift
DeTh
PosDiffDrift
DeTh
Burst
Burst
PosRecalI
Res
NegDriftI
ComFact
DirChTh
PosDriftI
Symbol
Symbol
DiffFact
DirChI
t
t
Setup
EDI
C
C
R
CAL
C
DI
MCKey
MCKey
MCKey
SCKey
SCKey
S
X
T
S
MCKey
SCKey
MCKey
SCKey
External sensing components
Capacitive sensing parameters
Sense capacitor
Equivalent electrode capacitor
Equivalent touch capacitor
Serial resistance
Calibration duration
Setup duration
Resolution (MCKey)
Detection integrator
Default detection threshold (SCKey)
Detection threshold (MCKey)
End of detection integrator
End of detection threshold (SCKey)
End of detection threshold (MCKey)
Positive recalibration integrator
Positive recalibration threshold (SCKey)
Positive recalibration threshold (MCKey)
Wheel/Slider Direction Change Integrator
Wheel/Slider Direction Change Threshold
Max on-duration delay
Positive differential drift compensation rate
Negative differential drift compensation rate
Positive common drift compensation rate
Negative common drift compensation rate
Positive drift integrator
Negative drift integrator
Common time step factor
Differential time step factor
Burst length (SCKey)
Burst length (MCKey)
Parameter
Parameter
–128
–128
–128
–128
Min.
Min.
0.1
0.1
0.1
0.1
1
0
0
0
1
1
0
0
1
0
0
0
0
20
50
Default Max.
Infinite
Typ.
100
–10
–30
–20
0.2
0.2
–8
30
10
10
10
10
7
2
2
5
6
3
4
1
1
2
5
Max.
TBD
25.5
25.5
25.5
25.5
2000
5000
255
255
255
128
128
255
255
255
255
255
255
255
100
100
–1
–1
–1
–1
8
22
positions
positions
QST608
Counts
Counts
Counts
Counts
Counts
Counts
Counts
Counts
Counts
Counts
Counts
s/level
s/level
s/level
s/level
kOhm
Unit
Unit
bits
ms
ms
nF
pF
pF
s