PMBus 6-Channel Power-Supply Manager

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TABLE OF CONTENTS

Absolute Maximum Ratings . .. ... ... .. .. ... ... .. ... ... .. ... ... .. ... .. ... ... .. ... ... .. ... .. ... ... . 6

Recommended Operating Conditions .. .. ... ... ... .. ... .. ... .. ... ... .. ... ... .. ... ... .. ... .. ... ... .. 6

DC Electrical Characteristics . ... .. ... .. ... .. ... ... .. ... .. ... ... .. ... ... .. ... ... .. ... .. ... ... .. ... 6

I2C/SMBus Interface Electrical Specifications.. .. ... ... .. ... ... .. ... .. ... .. ... ... .. ... ... .. ... .. ... .. 8

I2C/SMBus Timing .. .. ... ... .. ... ... .. ... .. ... .. ... ... .. ... ... .. ... .. ... ... ... .. ... .. ... ... .. .. 8

Typical Operating Characteristics . ... .. ... ... .. .. ... ... .. ... ... .. ... .. ... ... ... .. ... .. ... ... .. ... . 9

Pin Configuration .. ... ... .. ... .. ... .. ... ... .. ... ... .. ... ... .. ... .. ... ... .. ... ... .. ... ... .. ... . 10

Pin Description .. .. ... ... .. ... ... .. ... .. ... .. ... ... .. ... ... .. ... .. ... ... ... .. ... .. ... ... .. ... . 10

Block Diagram .. ... ... .. ... .. ... .. ... ... .. ... ... ... .. .. ... ... .. ... ... .. ... ... .. ... .. ... ... .. . 12

Multiple Device Connection Diagram.. .. ... ... .. ... ... .. ... .. ... .. ... ... .. ... ... .. ... .. ... ... ... .. 13

Detailed Description.. .. ... ... .. ... ... .. ... .. ... .. ... ... .. ... ... .. ... .. ... ... ... .. ... .. ... ... .. 14

Address Select ............................................................................. 16

SMBus/PMBus Operation ..................................................................... 16

SMBus/PMBus Communication Examples ..................................................... 16

Group Command ........................................................................... 17

Group Command Write Format .............................................................. 17

Addressing ................................................................................ 17

ALERT and Alert Response Address (ARA) ....................................................... 17

Alert Response Address (ARA) Byte Format.................................................... 18

Host Sends or Reads Too Few Bits ............................................................. 18

Host Sends or Reads Too Few Bytes ............................................................ 18

Host Sends Too Many Bytes or Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Host Reads Too Many Bytes or Bits ............................................................. 18

Host Sends Improperly Set Read Bit in the Slave Address Byte ....................................... 18

Unsupported Command Code Received ......................................................... 18

Invalid Data Received ........................................................................ 18

Host Reads from a Write-Only Command ........................................................ 19

Host Writes to a Read-Only Command........................................................... 19

SMBus Timeout ............................................................................. 19

PMBus Operation ........................................................................... 19

PMBus Protocol Support...................................................................... 19

Data Format................................................................................ 19

Interpreting Received DIRECT Format Values ..................................................... 19

Sending a DIRECT Format Value ............................................................... 20

Fault Management and Reporting .............................................................. 21

System Watchdog Timer ...................................................................... 21

Temperature Sensor Operation ................................................................. 22