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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32L151VBT6DTR датащи(PDF) 85 Page - STMicroelectronics |
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STM32L151VBT6DTR датащи(HTML) 85 Page - STMicroelectronics |
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85 / 121 page  STM32L151x6/8/B, STM32L152x6/8/B Electrical characteristics Doc ID 17659 Rev 8 85/121 Figure 20. I2C bus AC waveforms and measurement circuit 1. Measurement points are done at CMOS levels: 0.3VDD and 0.7VDD. Table 48. 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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