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QST104 Datasheet(PDF) 38 Page - STMicroelectronics

Part # QST104
Description  Capacitive touch sensor device 4 keys with individual key state outputs or I2C interface
PDF  45 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

QST104 Datasheet(HTML) 38 Page - STMicroelectronics

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Electrical characteristics
QST104
38/45
6.8
I2C control interface
Subject to general operating conditions for VDD, and TA unless otherwise specified.
The QST104 I2C interface meets the requirements of the Standard I2C communication
protocol described in the following table with the restriction mentioned below:
Refer to I/O port characteristics for more details on the input/output alternate function
characteristics (SDA and SCL).
Table 30.
I²C characteristics
Symbol
Parameter
100 kHz speed
Unit
Min. (1)
1.
Data based on standard I2C protocol requirement, not tested in production.
Max. (1)
tw(SCLL)
SCL clock low time
4.7
µs
tw(SCLH)
SCL clock high time
4.0
tsu(SDA)
SDA setup time
250
ns
th(SDA)
SDA data hold time
0 (2)
2.
The maximum hold time of the START condition has only to be met if the interface does not stretch the low
period of the SCL signal.
tr(SDA)
tr(SCL)
SDA and SCL rise time
1000
ns
tf(SDA)
tf(SCL)
SDA and SCL fall time
300
th(STA)
START condition hold time
4.0
µs
tsu(STA)
Repeated START condition setup time
4.7
tsu(STO)
STOP condition setup time
4.0
μs
tw(STO:STA) STOP to START condition time (bus free)
4.7
µs
Cb
Capacitive load for each bus line
400
pF
Table 31.
IRQ specific pin characteristics (1)
1.
For additional pin parameters, please use the pin description in Section 6.6: KOUTn/OPTn/GPOn pin
characteristics on page 34.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
tW(IRQ) IRQ pulse width
10
15
µs
RIRQ
IRQ internal pull-up (2)
2.
The IRQ pull-up equivalent resistor is based on a resistive transistor.
VDD = 5V
100
120
140
k
Ω
VDD = 3V
300



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