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MAX16068 Datasheet(PDF) 29 Page - Maxim Integrated Products |
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MAX16068 Datasheet(HTML) 29 Page - Maxim Integrated Products |
29 / 40 page ![]() ______________________________________________________________________________________ 29 6-Channel, Flash-Configurable System Manager with Nonvolatile Fault Registers Figure 9. SMBus Protocols SEND BYTE FORMAT S ADDRESS SLAVE ADDRESS: Address of the slave on the serial interface bus. DATA BYTE: Presets the internal address pointer or represents a command. R/W ACK COMMAND ACK P 7 BITS 0 0 0 8 BITS RECEIVE BYTE FORMAT S ADDRESS SLAVE ADDRESS: Address of the slave on the serial interface bus. DATA BYTE: Data is read from the location pointed to by the internal address pointer. R/W ACK DATA NACK P 7 BITS 1 0 0 1 1 8 BITS WRITE BYTE FORMAT S ADDRESS SLAVE ADDRESS: Address of the slave on the serial interface bus. COMMAND BYTE: Sets the internal address pointer. R/W ACK COMMAND ACK 7 BITS 0 0 0 0 8 BITS DATA BYTE: Data is written to the locations set by the internal address pointer. DATA ACK P 8 BITS READ BYTE FORMAT S SLAVE ADDRESS SLAVE ADDRESS: Address of the slave on the serial interface bus. COMMAND BYTE: Sets the internal address pointer. R/W R/W ACK COMMAND ACK 7 BITS 0 0 0 0 1 8 BITS DATA BYTE: Data is written to the locations set by the internal address pointer. SR R/W R/W SLAVE ADDRESS R/W 7 BITS 1 BLOCK WRITE FORMAT S ADDRESS SLAVE ADDRESS: Address of the slave on the serial interface bus. COMMAND BYTE: FAh DATA BYTE: Data is written to the locations set by the internal address pointer. ACK COMMAND ACK 7 BITS 0 0 0 0 0 0 0 8 BITS BYTE COUNT = N ACK P 8 BITS DATA BYTE 1 ACK 8 BITS DATA BYTE N ACK 8 BITS DATA BYTE … ACK ACK DATA BYTE 8 BITS 8 BITS SMBALERT# ALERT RESPONSE ADDRESS: Only the device that interrupted the master responds to this address. SLAVE ADDRESS: Slave places its own address on the serial bus. S ADDRESS R/W ACK DATA NACK P 0001100 D.C. 8 BITS NACK P SLAVE TO MASTER MASTER TO SLAVE BLOCK READ FORMAT S ADDRESS SLAVE ADDRESS: Address of the slave on the serial interface bus. S = START CONDITION P = STOP CONDITION Sr = REPEATED START CONDITION D.C. = DON’T CARE ACK = ACKNOWLEDGE, SDA PULLED LOW DURING RISING EDGE OF SCL. NACK = NOT ACKNOWLEDGE, SDA LEFT HIGH DURING RISING EDGE OF SCL. ALL DATA IS CLOCKED IN/OUT OF THE DEVICE ON RISING EDGES OF SCL. = SDA TRANSITIONS FROM HIGH TO LOW DURING PERIOD OF SCL. = SDA TRANSITIONS FROM LOW TO HIGH DURING PERIOD OF SCL. COMMAND BYTE: FBh DATA BYTE: Data is read from the locations set by the internal address pointer. ACK COMMAND ACK 7 BITS ADDRESS SLAVE ADDRESS: Address of the slave on the serial interface bus. 7 BITS 0 0 0 0 0 0 0 1 8 BITS ACK P 8 BITS DATA BYTE N ACK 8 BITS ACK DATA BYTE N 8 BITS DATA BYTE … NACK 8 BITS SR ACK 1 BYTE COUNT = N S ADDRESS COMMAND PEC P 7 BITS 0 0 8 BITS 0 WRITE BYTE FORMAT WITH PEC READ BYTE FORMAT WITH PEC BLOCK WRITE WITH PEC BLOCK READ WITH PEC DATA 0 8 BITS 0 8 BITS S S S ADDRESS COMMAND DATA PEC P P SR SR ADDRESS 0 0 0 1 0 0 0 0 0 0 0 0 NACK 1 P 0 0 0 8 BITS 0 0 0 8 BITS COMMAND 8 BITS COMMAND 8 BITS 0 0 0 8 BITS DATA N 8 BITS DATA N 8 BITS PEC 8 BITS PEC 8 BITS 0 7 BITS ADDRESS 7 BITS ADDRESS 7 BITS 1 1 7 BITS BYTE COUNT N 8 BITS BYTE COUNT N 8 BITS ADDRESS 7 BITS DATA BYTE 1 8 BITS DATA BYTE 1 8 BITS DATA BYTE 8 BITS DATA BYTE 8 BITS R/W R/W R/W R/W R/W R/W ACK ACK ACK ACK ACK ACK ACK ACK NACK ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK |
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