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QST108 데이터시트(PDF) 35 Page - STMicroelectronics

부품명 QST108
상세설명  Capacitive touch sensor device 8 keys with individual key state outputs or I2C interface
PDF  51 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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QST108 데이터시트(HTML) 35 Page - STMicroelectronics

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QST108
Electrical characteristics
35/51
6.6
Capacitive sensing characteristics
Table 29.
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 resistor
10
22
kOhm
Table 30.
Capacitive sensing parameters
Symbol
Parameter
Min.
Default
Max.
Unit
tCAL
Calibration duration
2
s
tSetup
Setup duration
100
ms
DI
Detection integrator
12
255
Samples
DeTh
Detection threshold
-128
-10
-1
Counts
EDI
End of detection integrator
12
255
Samples
EofDeTh
End of detection threshold
-128
-6
-1
Counts
PosRecalI
Positive recalibration integrator
12
255
Samples
PosRecalTh
Positive recalibration threshold
115
127
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
2
255
DiffFact
Differential time step factor
0
10
255
BurstCount
Burst length
20
2000
Counts



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