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STM32F217VG Datasheet(PDF) 103 Page - STMicroelectronics |
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STM32F217VG Datasheet(HTML) 103 Page - STMicroelectronics |
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103 / 173 page  STM32F21xxx Electrical characteristics Doc ID 17050 Rev 8 103/173 Figure 37. I2C bus AC waveforms and measurement circuit 1. Measurement points are done at CMOS levels: 0.3VDD and 0.7VDD. Table 50. SCL frequency (fPCLK1= 30 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 kΩ 400 0x8019 300 0x8021 200 0x8032 100 0x0096 50 0x012C 20 0x02EE ai14979b START SDA 100 Ω 4.7k Ω I²C bus 4.7k Ω 100 Ω VDD VDD STM32Fxx SDA SCL tf(SDA) tr(SDA) SCL th(STA) tw(SCLH) tw(SCLL) tsu(SDA) tr(SCL) tf(SCL) th(SDA) S TART REPEATED START tsu(STA) tsu(STO) STOP tw(STO:STA) |
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