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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ST25DV64K 데이터시트(PDF) 142 Page - STMicroelectronics |
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ST25DV64K 데이터시트(HTML) 142 Page - STMicroelectronics |
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142 / 197 page  Figure 75. I2C AC waveforms SCL SDA in SCL SDA out SCL SDA in tCHCL tDLCL tCHDX Start condition tCLCH tDXCX tCLDX SDA input SDA change tCHDH tDHDL Data valid tCLQV tCLQX tCHDH Stop condition tCHDX Start condition Write cycle tW Stop condition tCHCL tXH1XH2 tXH1XH2 tXL1XL2 tXL1XL2 Data valid tDL1DL2 Start condition Figure 76 shows how to calculate the value of the pull-up resistor. In applications where this method of synchronization is not employed, the pull-up resistor is not necessary, provided that the bus master has a push-pull (rather than open drain) output. Figure 76. I2C Fast mode (fC = 1 MHz): maximum Rbus value versus bus parasitic capacitance (Cbus) 1 10 10 100 Bus line capacitor (pF) I²C bus master ST25DV Rbus VCC Cbus SCL SDA Here, R bu s × Cbu s= 120 ns R bu s × C bu s = 150 ns 4 30 The Rbus x Cbus time constant must be below 150 ns. The time constant line is represented on the left. 100 ST25DV04K ST25DV16K ST25DV64K I2C parameters DS10925 - Rev 11 page 142/197 |
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