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STM32F103CBT7XXX Datasheet(PDF) 69 Page - STMicroelectronics |
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STM32F103CBT7XXX Datasheet(HTML) 69 Page - STMicroelectronics |
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69 / 116 page  DS5319 Rev 18 69/116 STM32F103x8, STM32F103xB Electrical characteristics 115 Figure 32. I2C bus AC waveforms and measurement circuit 1. Measurement points are done at CMOS levels: 0.3 VDD and 0.7 VDD. 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 = I2C speed, 2. For speeds around 200 kHz, the tolerance on the achieved speed is 5%. For other speed ranges, the tolerance on the achieved speed is 2%. These variations depend upon 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 ai14133g Start SDA I²C bus VDD_I2C VDD_I2C STM32F10x SDA SCL tf(SDA) tr(SDA) SCL th(STA) tw(SCLL) tw(SCLH) tsu(SDA) tr(SCL) tf(SCL) th(SDA) Start repeated Start tsu(STA) tsu(STO) Stop tsu(STO:STA) Rp Rp Rs Rs |
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