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M34E02-F 数据表(PDF) 10 Page - STMicroelectronics |
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M34E02-F 数据表(HTML) 10 Page - STMicroelectronics |
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10 / 36 page  Signal description M34E02-F 10/36 DocID10367 Rev 14 2.5.4 Power-down conditions During power-down (continuous decrease in VCC), the device must be in Standby Power mode (mode reached after decoding a Stop condition, assuming that there is no internal write cycle in progress). Figure 4. Maximum RP value versus bus parasitic capacitance (C) for an I2C bus Figure 5. I2C bus protocol 1 10 100 10 100 1000 Bus line capacitor (pF) When tLOW = 1.3 μs (min value for fC = 400 kHz), the Rbus × Cbus time constant must be below the 400 ns time constant line represented on the left. I²C bus master M34xxx Rbus VCC Cbus SCL SDA R bu s × C bu s = 400 ns Here Rbus × Cbus = 120 ns 4 k 30 pF MS31686V1 SCL SDA SCL SDA SDA Start condition SDA Input SDA Change AI00792c Stop condition 1 23 7 89 MSB ACK Start condition SCL 1 23 7 89 MSB ACK Stop condition |
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