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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72344 датащи(PDF) 174 Page - STMicroelectronics |
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ST72344 датащи(HTML) 174 Page - STMicroelectronics |
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174 / 191 page  ST72340, ST72344, ST72345 174/191 13.12 COMMUNICATION INTERFACE CHARACTERISTICS 13.12.1 I2C and I²C3SNS Interfaces Subject to general operating conditions for VDD, fOSC, and TA unless otherwise specified. Refer to I/O port characteristics for more details on the input/output alternate function characteristics (SDAI and SCLI). The ST7 I2C and I2C3SNS inter- faces meet the electrical and timing requirements of the Standard I2C communication protocol. TA = -40°C to 85°C, unless otherwise specified Note: 1. The I2C and I2C3SNS interfaces will not function below the minimum clock speed of 4 MHz. The following table gives the values to be written in the I2CCCR register to obtain the required I2C SCL line frequency. Table 29. SCL Frequency Table (Multimaster I2C Interface) 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. Symbol Parameter Conditions Min Max Unit fSCL I²C SCL frequency fCPU=4 MHz to 8 MHz 1), VDD= 2.7V to 5.5V 400 kHz fSCL3SNS I²C3SNS SCL frequency 400 kHz fSCL I2CCCR Value fCPU=4 MHz. fCPU=8 MHz. VDD = 3.3 V VDD = 5 V VDD = 3.3 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 84h 84h 84h 84h 300 NA NA NA NA 86h 86h 85h 87h 200 84h 84h 84h 84h 8Ah 8Ah 8Bh 8Ch 100 11h 10h 11h 11h 25h 24h 28h 28h 50 25h 24h 25h 26h 4Bh 4Ch 53h 54h 20 60h 5Fh 60h 62h FFh FFh FFh FFh |
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