EVALUATION KIT AVAILABLE MAX34460 PMBus 12-Channel Voltage Monitor and Sequencer General Description Features The MAX34460 is a system monitor that is capable of S 12 Channels of Power-Supply Management managing up to 12 power supplies. The power-supply S Power-Supply Voltage Measurement and manager monitors the power-supply output voltages and Monitoring constantly checks for user-programmable overvoltage S Fast Minimum/Maximum Threshold Excursion and undervoltage thresholds. If a fault is detected, Detection the device automatically shuts down the system in an S Remote Ground Sensing Improves Measurement orderly fashion. The device can sequence the supplies in any order at both power-up and power-down. With Accuracy the addition of external current DACs, the device has S Automatic Closed-Loop Margining the ability to close-loop margin the power-supply output S Programmable Up and Down Time-Based or voltages up or down to a user-programmable level. The Event-Based Sequencing device contains an internal temperature sensor and can S Supports Dual-Sequencing Groups support up to four external remote temperature sensors. Once configured, the device can operate autonomously S Supports Up to Five Temperature Sensors without any host intervention. (One Internal/Four Remote) S Fault Detection on All Temperature Sensors Applications S Programmable Alarm Outputs Network Switches/Routers S Reports Peak and Average Levels for a Number of Base Stations Parameters Servers S Watchdog Timer Function Smart Grid Network Systems S PMBus-Compliant Command Interface 2 S I C/SMBus-Compatible Serial Bus with Bus Timeout Function S On-Board Nonvolatile Black Box Fault Logging Ordering Information and Typical Operating Circuit appear and Default Configuration Setting at end of data sheet. S Expandable Channel Operation with Parallel Devices S Up to 20 GPOs S No External Clocking Required S 3.0V to 3.6V Supply Voltage PMBus is a trademark of SMIF, Inc. For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/MAX34460.related For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. 19-6486 Rev 1 11/13MAX34460 PMBus 12-Channel Voltage Monitor and Sequencer TABLE OF CONTENTS General Description .................. 1 Applications .................... 1 Features ................... 1 Absolute Maximum Ratings ................ 8 Recommended Operating Conditions ................ 8 Electrical Characteristics .................. 8 2 I C/SMBus INTERFACE ELECTRICAL SPECIFICATIONS ........... 10 2 I C/SMBus Timing .................. 10 Typical Operating Characteristics ................ 11 Pin Configuration ................... 13 Pin Description ................... 13 Expanded Pin Description .................................................................... 15 Block Diagram ................... 16 Detailed Description................... 16 Address Select ............................................................................. 19 SMBus/PMBus Operation ..................................................................... 19 SMBus/PMBus Communication Examples .....................................................20 Group Command ........................................................................... 21 Group Command Write Format .............................................................. 21 Addressing ................................................................................ 21 ALERT and Alert Response Address (ARA)....................................................... 21 Alert Response Address (ARA) Byte Format....................................................22 Host Sends or Reads Too Few Bits .............................................................22 Host Sends or Reads Too Few Bytes ............................................................22 Host Sends Too Many Bytes or Bits . 22 Host Reads Too Many Bytes or Bits .............................................................22 Host Sends Improperly Set Read Bit in the Slave Address Byte .......................................22 Unsupported Command Code Received/Host Writes to a Read-Only Command .........................22 Invalid Data Received ........................................................................22 Host Reads from a Write-Only Command ........................................................23 Host Writes to a Read-Only Command...........................................................23 SMBus Timeout.............................................................................23 PMBus Operation ...........................................................................23 PMBus Protocol Support......................................................................23 Data Format................................................................................23 Interpreting Received DIRECT Format Values .....................................................23 Maxim Integrated 2