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QST104 bảng dữ liệu(PDF) 33 Page - STMicroelectronics

tên linh kiện QST104
Giải thích chi tiết về linh kiện  Capacitive touch sensor device 4 keys with individual key state outputs or I2C interface
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QST104 bảng dữ liệu(HTML) 33 Page - STMicroelectronics

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QST104
Electrical characteristics
33/45
6.5
Capacitive sensing characteristics
Table 25.
External sensing components
Symbol
Parameter
Min.
Typ.
Max.
Unit
CS
Sense capacitor
100
nF
CX
Equivalent electrode capacitor
100
pF
CT
Equivalent touch capacitor
5
pF
RS
Serial resistance
10
22
kOhm
Table 26.
Capacitive sensing parameters
Symbol
Parameter
Min.
Default
Max.
Unit
tCAL
Calibration duration
TBD
ms
tSetup
Setup duration
100
ms
DI
Detection integrator
02
255
Counts
DeTh
Detection threshold
-128
-10
-1
Counts
EDI
End of detection integrator
02
255
Counts
EofDeTh
End of detection threshold
-128
-8
-1
Counts
PosRecalI
Positive recalibration integrator
02
255
Counts
PosRecalTh
Positive recalibration threshold
16
128
Counts
MaxOnDuration Max on-duration delay
1
Infinite
255
s
PosDiffDrift
Positive differential drift compensation rate
0.1
1
25.5
s/level
NegDiffDrift
Negative differential drift compensation rate
0.1
1
25.5
s/level
PosComDrift
Positive common drift compensation rate
0.1
0.2
25.5
s/level
NegComDrift
Negative common drift compensation rate
0.1
0.2
25.5
s/level
PosDriftI
Positive drift integrator
0
10
255
NegDriftI
Negative drift integrator
0
10
255
ComFact
Common time step factor
0
10
255
DiffFact
Differential time step factor
0
2
255
BurstCount
Burst length
20
2000
Counts



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