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STR71XF 数据表(PDF) 62 Page - STMicroelectronics |
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STR71XF 数据表(HTML) 62 Page - STMicroelectronics |
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62 / 78 page  Electrical parameters STR71xF 62/78 Figure 33. Typical application with I2C bus and timing diagram 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 37. 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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