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MAX6653AEE Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX6653AEE Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 24 page Temperature Monitors and PWM Fan Controllers _______________________________________________________________________________________ 7 Figure 1. SMBus Protocols Write Byte Format Read Byte Format Send Byte Format Receive Byte Format Slave Address: equiva- lent to chip-select line of a 3-wire interface Command Byte: selects which register you are writing to Data Byte: data goes into the register set by the co mma nd byte ( to se t thresholds, configuration masks, and sampling rate) Slave Address: equiva- lent to chip-select line Command Byte: selects which register you are reading from Slave Address: repeated due to change in data- flow direction Data Byte: reads from the register set by the command byte Data Byte: writes data to the register commanded by the last read byte or write byte transmission Data Byte: reads data from the register commanded by the last read byte or write byte transmission; also used for SMBus alert response return address S = Start condition P = Stop condition Shaded = Slave transmission / / / = Not acknowledged ACK 7 bits ADDRESS ACK 8 bits DATA ACK P 8 bits S COMMAND WR ACK 7 bits ADDRESS ACK S ACK 8 bits DATA 7 bits ADDRESS RD 8 bits P S COMMAND / / / WR ACK 7 bits ADDRESS 8 bits COMMAND ACK P S WR ACK 7 bits ADDRESS RD 8 bits DATA P S / / / Figure 2. SMBus Write Timing Diagram SMBCLK AB C D E FG H I J K SMBDATA tSU:STA tHD:STA tLOW tHIGH tSU:DAT tHD:DAT tSU:STO tBUF A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO SLAVE D = R/W BIT CLOCKED INTO SLAVE E = SLAVE PULLS SMBDATA LINE LOW L M F = ACKNOWLEDGE BIT CLOCKED INTO MASTER G = MSB OF DATA CLOCKED INTO SLAVE H = LSB OF DATA CLOCKED INTO SLAVE I = MASTER PULLS DATA LINE LOW J = ACKNOWLEDGE CLOCKED INTO SLAVE K = ACKNOWLEDGE CLOCK PULSE L = STOP CONDITION, DATA EXECUTED BY SLAVE M = NEW START CONDITION |
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