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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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ST25DV64KC Scheda tecnica(PDF) 148 Page - STMicroelectronics |
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ST25DV64KC Scheda tecnica(HTML) 148 Page - STMicroelectronics |
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148 / 203 page  Figure 81. 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 Stop condition Data valid tCLQV tCLQX tCHDH Stop condition tCHDX Start condition Write cycle tW Start condition tCHCL tXH1XH2 tXH1XH2 tXL1XL2 tXL1XL2 Data valid tDL1DL2 Figure 82 indicates how the value of the pull-up resistor can be calculated. In most applications, though, this method of synchronization is not employed, and so the pull-up resistor is not necessary, provided that the bus master has a push-pull (rather than open drain) output. Figure 82. 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 ST25DV04KC ST25DV16KC ST25DV64KC I2C DC and AC parameters DS13519 - Rev 3 page 148/203 |
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