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STM32F103C8T7 数据表(PDF) 71 Page - STMicroelectronics |
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STM32F103C8T7 数据表(HTML) 71 Page - STMicroelectronics |
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71 / 105 page  STM32F103x8, STM32F103xB Electrical characteristics Doc ID 13587 Rev 15 71/105 Figure 32. I2C bus AC waveforms and measurement circuit 1. Measurement points are done at CMOS levels: 0.3VDD and 0.7VDD. 2. Rs = Series protection resistors, Rp = Pull-up resistors, VDD_I2C = I2C bus supply. Table 41. SCL frequency (fPCLK1= 36 MHz.,VDD_I2C = 3.3 V) (1)(2) 1. RP = External pull-up resistance, fSCL = I 2C 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. fSCL (kHz) I2C_CCR value RP = 4.7 kΩ 400 0x801E 300 0x8028 200 0x803C 100 0x00B4 50 0x0168 20 0x0384 Rp Rp Rs Rs |
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