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ST7LITE49M 数据表(PDF) 153 Page - STMicroelectronics |
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ST7LITE49M 数据表(HTML) 153 Page - STMicroelectronics |
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153 / 188 page  ST7LITE49M Electrical characteristics 153/188 13.5 Communication interface characteristics 13.5.1 I2C interface 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 interface meets the electrical and timing requirements of the Standard I2C communication protocol. TA = -40°C to 125 °C, unless otherwise specified. Table 77 gives the values to be written in the I2CCCR register to obtain the required I2C SCL line frequency. Table 76. I2C interface characteristics Symbol Parameter Conditions Min Max Unit fSCL (1) 1. The I2C interface will not function below the minimum clock speed of 4 MHz (see Table 77). I²C SCL frequency fCPU=4 MHz to 8 MHz, VDD= 2.4 to 5.5 V 400 kHz Table 77. SCL frequency (multimaster I2C interface)(1)(2)(3) 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 83h 84h 84h 300 NA NA NA NA 86h 86h 86h 86h 200 84h 84h 84h 84h 8Ah 8Ah 8Ah 8Ah 100 11h 11h 11h 11h 25h 24h 25h 24h 50 25h 25h 25h 25h 4Ch 4Ch 4Dh 4Ch 20 61h 61h 61h 62h FFh FFh FFh FFh 1. RP = External pull-up resistance, fSCL = I 2C speed, NA = Not achievable, TBD = To be determined. 2. For fast mode speeds, achieved speed can have ±5% tolerance. For other speed ranges, achieved speed can have ±2% tolerance. 3. The above variations depend on the accuracy of the external components used. |
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