STM8S207xx, STM8S208xx
2
Electrical characteristics
10.3.9
I C interface characteristics
2
Table 43. I C characteristics
Standard mode I2C Fast mode I2C(1)
Symbol Parameter
Unit
Min(2)
Max(2)
Min(2) Max(2)
tw(SCLL) SCL clock low time
tw(SCLH) SCL clock high time
tsu(SDA) SDA setup time
4.7
4.0
1.3
0.6
µs
250
0(3)
100
th(SDA)
SDA data hold time
0(4)
900(3)
300
tr(SDA)
tr(SCL)
ns
SDA and SCL rise time
1000
300
tf(SDA)
tf(SCL)
SDA and SCL fall time
300
th(STA)
START condition hold time
4.0
4.7
4.0
0.6
0.6
0.6
µs
tsu(STA) Repeated START condition setup time
tsu(STO) STOP condition setup time
µs
µs
pF
STOP to START condition time
tw(STO:STA)
(bus free)
4.7
1.3
Cb
Capacitive load for each bus line
400
400
1. fMASTER, must be at least 8 MHz to achieve max fast I2C speed (400kHz)
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
time
3.
4.
The device must internally provide a hold time of at least 300 ns for the SDA signal in order to bridge the
undefined region of the falling edge of SCL
Doc ID 14733 Rev 9
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