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IR36021 датащи(PDF) 35 Page - International Rectifier |
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IR36021 датащи(HTML) 35 Page - International Rectifier |
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35 / 41 page ![]() IR36021 DIGITAL POL BUCK CONTROLLER with I2C AND PMBus Interface February 27, 2013 | Rev 3.5 35 I2C PROTOCOLS All registers may be accessed using either I2C or PMBus protocols. I2C allows the use of a simple format whereas PMBus provides error checking capability. Figure 41 shows the I2C format employed by the IR36021. Figure 41: I2C Format SMBUS/PMBUS PROTOCOLS To access IR’s configuration and monitoring registers, 4 different protocols are required: the SMBus Read/Write Byte/Word protocol with/without PEC (for status and monitoring) the SMBus Send Byte protocol with/without PEC (for CLEAR_FAULTS only) the SMBus Block Read protocol for accessing Model and Revision information the SMBus Process call (for accessing Configuration Registers) An explanation of which command codes and protocols are required to access them is given in Table 34. In addition, the IR36021 supports: Alert Response Address (ARA) Bus timeout (10ms) Group Command for writing to many VRs within one command Figure 42: SMBus Write Byte/Word |
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