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STM32F217VG 数据表(PDF) 110 Page - STMicroelectronics |
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STM32F217VG 数据表(HTML) 110 Page - STMicroelectronics |
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110 / 175 page  Electrical characteristics STM32F21xxx 110/175 DocID17050 Rev 9 Figure 38. I2C bus AC waveforms and measurement circuit 1. RS= series protection resistor. 2. RP = external pull-up resistor. 3. VDD_I2C is the I2C bus power supply. Table 52. SCL frequency (fPCLK1= 30 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 0x8019 300 0x8021 200 0x8032 100 0x0096 50 0x012C 20 0x02EE ai14979c STAR T SD A RP I²C bus VDD_I2C STM32Fxx SDA SCL tf(SDA) tr(SDA) SCL th(STA) tw(SCLH) tw(SCLL) tsu(SDA) tr(SCL) tf(SCL) th(SDA) S TAR T REPEATED STAR T tsu(STA) tsu(STO) STOP tw(STO:STA) VDD_I2C RP RS RS |
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