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STM32F107VC 数据表(PDF) 65 Page - STMicroelectronics |
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STM32F107VC 数据表(HTML) 65 Page - STMicroelectronics |
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65 / 108 page  DocID15274 Rev 10 65/108 STM32F105xx, STM32F107xx Electrical characteristics 107 Figure 24. I2C bus AC waveforms and measurement circuit 1. Measurement points are done at CMOS levels: 0.3VDD and 0.7VDD. Table 42. SCL frequency (fPCLK1= 36 MHz.,VDD = 3.3 V)(1)(2) 1. RP = External pull-up resistance, fSCL = 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. fSCL (kHz) I2C_CCR value RP = 4.7 kΩ 400 0x801E 300 0x8028 200 0x803C 100 0x00B4 50 0x0168 20 0x0384 ai14133d Start SDA 100 Ω 4.7k Ω I²C bus 4.7k Ω 100 Ω VDD VDD STM32F10x SDA SCL tf(SDA) tr(SDA) SCL th(STA) tw(SCLH) tw(SCLL) tsu(SDA) tr(SCL) tf(SCL) th(SDA) Start repeated Start tsu(STA) tsu(STO) Stop tsu(STO:STA) |
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