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AD9520-2/PCBZ 数据表(PDF) 53 Page - Analog Devices |
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AD9520-2/PCBZ 数据表(HTML) 53 Page - Analog Devices |
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53 / 84 page ![]() AD9520-2 Rev. 0 | Page 53 of 84 Data Transfer Format Send byte format—the send byte protocol is used to set up the register address for subsequent commands. S Slave Address W A RAM Address High Byte A RAM Address Low Byte A P Write byte format—the write byte protocol is used to write a register address to the RAM starting from the specified RAM address. S Slave Address W A RAM Address High Byte A RAM Address Low Byte A RAM Data 0 A RAM Data 1 A RAM Data 2 A P Receive byte format—the receive byte protocol is used to read the data byte(s) from RAM starting from the current address. S Slave Address R A RAM Data 0 A RAM Data 1 A RAM Data 2 A P Read byte format—the combined format of the send byte and the receive byte. S Slave Address W A RAM Address High Byte A RAM Address Low Byte A Sr Slave Address R A RAM Data 0 A RAM Data 1 A RAM Data 2 A P I²C Serial Port Timing SDA SCL S Sr P S tFALL tSET; DAT tLOW tRISE tHLD; STR tHLD; DAT tHIGH tFALL tSET; STR tHLD; STR tSPIKE tSET; STP tRISE tIDLE Figure 60. I²C Serial Port Timing Table 42. I2C Timing Definitions Parameter Description fI2C I²C clock frequency tIDLE Bus idle time between stop and start conditions tHLD; STR Hold time for repeated start condition tSET; STR Setup time for repeated start condition tSET; STP Setup time for stop condition tHLD; DAT Hold time for data tSET; DAT Setup time for data tLOW Duration of SCL clock low tHIGH Duration of SCL clock high tRISE SCL/SDA rise time tFALL SCL/SDA fall time tSPIKE Voltage spike pulse width that must be suppressed by the input filter |
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