EVALUATION KIT AVAILABLE MAX34440 PMBus 6-Channel Power-Supply Manager General Description Features The MAX34440 is a complex system monitor that can S 6 Channels of Power-Supply Management manage up to six power supplies. The power-supply Voltage Measurement/Monitoring manager monitors the power-supply output voltage and Differential 12-Bit 1% Accurate ADC constantly checks for user-programmable overvoltage Min/Max Threshold Excursion Detection and undervoltage thresholds. It can also margin the Supports Current Monitoring with External power-supply output voltage up or down to a user- Current-Sense Amplifier programmable level. The margining is performed in a Automatic Closed-Loop Margining closed-loop arrangement whereby the device automati- Programmable Up and Down Sequencing cally adjusts a pulse-width-modulated (PWM) output and Power-Good Output then measures the resultant output voltage. The power- S Supports Up to Eight Temperature Sensors supply manager can also sequence the supplies in any Two Remote Diode Temperature Sensors order at both power-up and power-down. With the addi- Five Local Temperature Sensors tion of an external current-sense amplifier, the device One Internal Temperature Sensor can also monitor currents. Fault Detection on All Temp Sensors S PMBus-Compliant Command Interface Applications 2 S I C/SMBus-Compatible Serial Bus with Bus Network Switches/Routers Timeout Function Base Stations S On-Board Nonvolatile Fault Logging and Default Servers Configuration Setting Smart Grid Network Systems S No External Clocking Required Industrial Controls S +3.3V Supply Voltage Ordering Information PIN- PART FIRMWARE PACKAGE MAX34440ETL+ 40 TQFN-EP* 31 MAX34440ETL+T 40 TQFN-EP* 31 MAX34440ETLA1+ 40 TQFN-EP* 31 MAX34440ETLA1+T 40 TQFN-EP* 31 Note: All devices operate over the -40C to +85C tempera- ture range. +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. *EP = Exposed pad. PMBus is a trademark of SMIF, Inc. Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, go to: www.maximintegrated.com/errata. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. 19-5527 Rev 4 11/15MAX34440 PMBus 6-Channel Power-Supply Manager TABLE OF CONTENTS General Description .................. 1 Applications .................... 1 Features ................... 1 Ordering Information ................. 1 Absolute Maximum Ratings ................ 6 Recommended Operating Conditions ................ 6 DC Electrical Characteristics ................. 6 2 I C/SMBus Interface Electrical Specifications .............. 8 2 I C/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 2 Maxim Integrated