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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STR71XF датащи(PDF) 62 Page - STMicroelectronics |
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STR71XF датащи(HTML) 62 Page - STMicroelectronics |
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62 / 77 page  Electrical parameters STR71xF 62/77 period of SCL signal. 4. Measurement points are done at CMOS levels: 0.3xVDD and 0.7xVDD. 5. fPCLK1, must be at least 8MHz to achieve max fast I 2C speed (400kHz). 6. The following table gives the values to be written in the I2CCCR register to obtain the required I2C SCL line frequency. Figure 33. Typical Application with I2C Bus and Timing Diagram 4) Legend: RP = External pull-up resistance fSCL = I 2C speed NA = Not achievable Note: For speeds around 200 kHz, achieved speed can have ±5% tolerance For other speed ranges, achieved speed can have ±2% tolerance The above variations depend on the accuracy of the external components used. Table 35. SCL Frequency Table (fPCLK1=8 MHz.,V33 = 3.3 V) fSCL (kHz) I2CCCR Value RP=4.7kΩ 400 83 300 85h 200 8Ah 100 24h 50 4Ch 20 C4h REPEATED START START STOP START tf(SDA) tr(SDA) tsu(SDA) th(SDA) tf(SCK) tr(SCK) tw(SCKL) tw(SCKH) th(STA) tsu(STO) tsu(STA) tw(STO:STA) SDA SCL 4.7k Ω SDA STR7 SCL VDD 100 Ω 100 Ω VDD 4.7k Ω I2CBUS |
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