Table 35 - ST STM32F103x6 Manual

Electrical characteristics
Figure 18. I
SDA
t f(SDA)
SCL
t w(SCKH)
1. Measurement points are done at CMOS levels: 0.3V

Table 35.

1. TBD = to be determined.
2. R = External pull-up resistance, f
P
3. For speeds around 200 kHz, the tolerance on the achieved speed is of ±5%. For other speed ranges, the
tolerance on the achieved speed ±2%. These variations depend on the accuracy of the external
components used to design the application.
50/67
2
C bus AC waveforms and measurement circuit
V DD
4 .7 kΩ
2
I C bus
S TART
t r(SDA)
t h(STA) t w(SCKL)
t r(SCK)
SCL frequency (f
PCLK1
f (kHz)
SCL
400
300
200
100
50
20
SCL
V DD
STM32F103xx
4 .7 kΩ
100Ω
SDA
100Ω
SCL
t su(SDA)
t h(SDA)
t f(SCK)
and 0.7V
DD
= 36 MHz.,V = 3.3 V)
DD
2
= I C speed,
S TART REPEATED
t su(STA)
S TOP
t su(STO)
.
DD
(1)(2)(3)
I2C_CCR value
R = 4.7 kΩ
P
TBD
TBD
TBD
TBD
TBD
TBD
STM32F103xx
S TART
t su(STA:STO)
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