QST104 STMicroelectronics, QST104 Datasheet - Page 38

• Manufacturer Part Number: QST104
• Description: Capacitive touch sensor device 4 keys
• Manufacturer: STMicroelectronics

Electrical characteristics
6.8
38/45
I
Subject to general operating conditions for V
The QST104 I
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.
1. Data based on standard I2C protocol requirement, not tested in production.
2. The maximum hold time of the START condition has only to be met if the interface does not stretch the low
Table 31.
1. For additional pin parameters, please use the pin description in
2. The IRQ pull-up equivalent resistor is based on a resistive transistor.
2
t
Symbol
w(STO:STA)
t
Symbol
t
W(IRQ)
C control interface
t
t
t
R
t
w(SCLH)
w(SCLL)
t
su(SDA)
t
t
su(STO)
t
t
t
su(STA)
h(SDA)
period of the SCL signal.
characteristics on page
h(STA)
r(SDA)
r(SCL)
f(SDA)
f(SCL)
IRQ
C
b
IRQ pulse width
IRQ internal pull-up
SCL clock low time
SCL clock high time
SDA setup time
SDA data hold time
SDA and SCL rise time
SDA and SCL fall time
START condition hold time
Repeated START condition setup time
STOP condition setup time
STOP to START condition time (bus free)
Capacitive load for each bus line
I²C characteristics
IRQ specific pin characteristics
2
C interface meets the requirements of the Standard I
Parameter
34.
(2)
Parameter
DD
Conditions
V
V
, and T
(1)
DD
DD
= 5V
= 3V
A
Section 6.6: KOUTn/OPTn/GPOn pin
unless otherwise specified.
Min.
100
10
Min.
100 kHz speed
0
250
4.7
4.7
4.7
4.0
4.0
4.0
2
(2)
C communication
Typ.
120
300
(1)
www.DataSheet4U.com
Max.
1000
300
400
Max.
140
15
(1)
QST104
Unit
Unit
pF
µs
ns
ns
µs
μs
µs
kΩ
µs