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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ST72F321AR 데이터시트(PDF) 166 Page - STMicroelectronics |
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ST72F321AR 데이터시트(HTML) 166 Page - STMicroelectronics |
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166 / 189 page  ST72321 166/189 COMMUNICATION INTERFACE CHARACTERISTICS (Cont’d) The following table gives the values to be written in the I2CCCR register to obtain the required I2C SCL line frequency. Table 27. SCL Frequency Table 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. fSCL (kHz) I2CCCR Value fCPU=4 MHz. fCPU=8 MHz. VDD = 4.1 V VDD = 5 V VDD = 4.1 V VDD = 5 V RP=3.3kΩ RP=4.7kΩ RP=3.3kΩ RP=4.7kΩ RP=3.3kΩ RP=4.7kΩ RP=3.3kΩ RP=4.7kΩ 400 NA NA NA NA 83h 83 83h 83h 300 NA NA NA NA 85h 85h 85h 85h 200 83h 83h 83h 83h 8Ah 89h 8Ah 8Ah 100 10h 10h 10h 10h 24h 23h 24h 23h 50 24h 24h 24h 24h 4Ch 4Ch 4Ch 4Ch 20 5Fh 5Fh 5Fh 5Fh FFh FFh FFh FFh |
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