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STM32F101X4 Datasheet(PDF) 56 Page - STMicroelectronics |
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STM32F101X4 Datasheet(HTML) 56 Page - STMicroelectronics |
56 / 73 page Electrical characteristics STM32F101x4, STM32F101x6 56/74 Doc ID 15058 Rev 3 Figure 23. I2C bus AC waveforms and measurement circuit(1) 1. Measurement points are done at CMOS levels: 0.3VDD and 0.7VDD. Table 39. SCL frequency (fPCLK1= MHz, VDD = 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 k 400 0x801E 300 0x8028 200 0x803C 100 0x00B4 50 0x0168 20 0x0384 ai14133c START SDA 100 Ω 4.7k Ω I²C bus 4.7k Ω 100 Ω VDD VDD STM32F10xxx SDA SCL tf(SDA) tr(SDA) SCL th(STA) tw(SCKH) tw(SCKL) tsu(SDA) tr(SCK) tf(SCK) th(SDA) S TART REPEATED START tsu(STA) tsu(STO) S TOP tsu(STA:STO) |
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