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STM32L151VD 数据表(PDF) 103 Page - STMicroelectronics |
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STM32L151VD 数据表(HTML) 103 Page - STMicroelectronics |
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103 / 140 page  STM32L151xD STM32L152xD Electrical characteristics Doc ID 022027 Rev 6 103/140 Figure 27. I2C bus AC waveforms and measurement circuit 1. Measurement points are done at CMOS levels: 0.3VDD and 0.7VDD. Table 56. SCL frequency (fPCLK1= 32 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 is ±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 0x801B 300 0x8024 200 0x8035 100 0x00A0 50 0x0140 20 0x0320 ai17855 START SDA 100 4.7k I2C bus 4.7k 100 VDD VDD STM32L15xxx 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) STOP tsu(STA:STO) |
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