QST608 ST Microelectronics, QST608 Datasheet - Page 37

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

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QST608
6.8
I
Subject to general operating conditions for V
The QST608 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 24.
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 25.
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
t
W(IRQ)
C control interface
t
t
R
t
w(SCLH)
w(SCLL)
t
su(SDA)
t
t
t
t
su(STO)
t
su(STA)
period of the SCL signal.
page
h(SDA)
r(SDA)
h(STA)
r(SCL)
f(SDA)
f(SCL)
IRQ
C
b
33.
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
(2)
Parameter
DD
Conditions
V
V
, and T
(1)
DD
DD
= 5V
= 3V
A
Section 6.6: GPOn pin characteristics on
unless otherwise specified.
Min.
100
10
Electrical characteristics
Min.
100 kHz speed
0
250
4.7
4.0
4.0
4.7
4.0
4.7
2
(2)
C communication
Typ.
120
300
(1)
Max.
1000
300
400
Max.
140
15
(1)
Unit
Unit
μs
µs
pF
37/44
µs
ns
ns
µs
kΩ
µs