STM32F101XC_11 Datasheet, PDF (88/112 Pages) STMicroelectronics – High-density access line, ARM-based 32-bit MCU with 256 to 512 KB Flash, 9 timers

Electrical characteristics
STM32F101xC, STM32F101xD, STM32F101xE
Figure 45. I²C bus AC waveforms and measurement circuit⁽¹⁾
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1. Measurement points are done at CMOS levels: 0.3V_DD and 0.7V_DD.
Table 52.
SCL frequency (f_PCLK1= 36 MHz, V_DD = 3.3 V)⁽¹⁾⁽²⁾
f_SCL
(kHz)
I2C_CCR value
R_P = 4.7 kΩ
400
0x801E
300
0x8028
200
0x803C
100
0x00B4
50
0x0168
20
0x0384
1. R_P = External pull-up resistance, f_SCL = I²C speed,
2. 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.
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Doc ID 14610 Rev 8