STM32F103C4H6ATR STMICROELECTRONICS [STMicroelectronics], STM32F103C4H6ATR Datasheet - Page 58

• Manufacturer Part Number: STM32F103C4H6ATR
• Description: Low-density performance line, ARM-based 32-bit MCU with 16 or 32 KB Flash, USB, CAN, 6 timers, 2 ADCs, 6 communication interfaces
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

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Figure 24. I
1. Measurement points are done at CMOS levels: 0.3V
Table 40.
1. R
2. For speeds around 200 kHz, the tolerance on the achieved speed is of  5%. For other speed ranges, the
t f(SDA)
tolerance on the achieved speed  2%. These variations depend on the accuracy of the external
components used to design the application.
SDA
SCL
P
= External pull-up resistance, f
t w(SCKH)
S TART
SCL frequency (f
I
2
2
C bus AC waveforms and measurement circuit
C bus
t h(STA)
f
SCL
400
300
200
100
50
20
(kHz)
t r(SDA)
4 .7 kΩ
t r(SCK)
V DD
t w(SCKL)
SCL
Doc ID 15060 Rev 3
PCLK1
4 .7 kΩ
= I
2
C speed,
t su(SDA)
= 36 MHz.,V
V DD
100Ω
100Ω
t f(SCK)
DD
t h(SDA)
and 0.7V
DD
= 3.3 V)
STM32F103xx
SDA
SCL
DD
t su(STA)
.
(1)(2)
I2C_CCR value
R
S TOP
S TART REPEATED
P
0x801E
0x803C
0x00B4
0x8028
0x0168
0x0384
= 4.7 k
t su(STO)
t su(STA:STO)
S TART
ai14149b