DEMO MANUAL DC2198A 16-Channel Power Supply System Featuring the LTC2980 Power System Manager DESCRIPTION The DC2198A is a demonstration system for the LTC 2980 DC2198A boards, thereby controlling up to 64 sepa- 2 16-channel I C/SMBus/PMBus power system manager rate power supply rails. Larger arrays of LTC2980s are 2 with EEPROM. The LTC2980 monitors and controls supported through programmable I C base address or 16power supply rails. The DC2198A demonstrates the bus segmentation. ability of the LTC2980 to sequence, trim, margin, super- The DC2198A demo board can be powered by an external vise, monitor, and log faults for sixteen power supply power supply, such as a +12VDC supply. Communication rails. Each power supply channels output voltage is with the software is provided through the DC1613 USB-to- monitored and the LTC2980 monitors its own internal 2 I C/SMBus/PMBus Controller. The following is a checklist die temperature. of items which can be obtained from the Analog Devices The DC2198A is a single circuit board that contains six- website or Analog Devices Field Sales. teen independent power supply rails. The board employs 2 USB-to-I C/SMBus/PMBus Controller (DC1613A) sixteen LTC3405A 300mA switch-mode regulators, which LTpowerPlay Software are configured to be controlled by the LTC2980. The LTC2980 is available in a BGA package and contains two LTC2977 devices. This board provides a sophisticated DC2198A FEATURES 16-channel digitally programmable power supply system. Sequence, Trim, Margin, and Supervise Sixteen The rail voltages are programmable within the trim range Power Supplies shown in the Performance Summary. Manage Faults, Monitor Telemetry, and Create Fault Logs This demonstration system is supported by the LTpowerPlay PMBus Compliant Command Set graphical user interface (GUI) that enables complete control Supported by LTpowerPlay GUI of all the features of the LTC2980. Together, the LTpowerPlay software and DC2198A hardware system create a powerful Margin or Trim Supplies to 0.25% Accuracy development environment for designing and testing LTC2980 Fast OV/UV Supervisors Per Channel configuration settings. These settings can be stored in the Supports Multichannel Fault Management devices internal EEPROM or in a file. This file can later be used to order pre-programmed devices or to program devices Automatic Fault Logging to Internal EEPROM in a production environment. The software displays all of the Operates Autonomously without Additional Software configuration settings and real-time measurements from the Sixteen OV/UV V and Two V Supervisors OUT IN LTC2980. Telemetry allows easy access and decoding of Telemetry Reads Back V , V , and Temperature the fault log created by the LTC2980. The board comes pre- IN OUT programmed with the EEPROM values appropriate for the 16 16-Channel Time-Based Output Sequencer power supplies used on the DC2198A. Just plug and play 2 I C/SMBus Serial Interface Multiple DC2198A boards can be cascaded together to Powered from 6V to 14VDC form a high channel count power supply (see Setup Available in 144-Pin 12mm 12mm BGA Procedure for Multi-Board Arrays). This cascaded Design files for this circuit board are available. configuration demonstrates features of the LTC2980 which enable timing and fault information to be shared All registered trademarks and trademarks are the property of their respective owners. across multiple ICs. The user can configure up to four Rev. A 1DEMO MANUAL DC2198A PERFORMANCE SUMMARY Specifications are at T = 25C A POWER SUPPLY CHANNEL CH(0:7) CH(8:15) Manager LTC2980 LTC2980 Nominal Untrimmed Output Voltages 1.0V, 1.1V, 1.2V, 1.3V, 1.4V, 1.5V, 1.7V, 1.8V 2.0V, 2.2V, 2.5V, 2.7V, 3.0V, 3.1V, 3.2V, 3.3V Rated Output Current 0.3A 0.3A Default Margin Range 5% 5% Output Trim Range (V = 1.38V) +13/19% +11/15% FS VDAC Temperature 1 Internal 11 Internal Common Characteristics Specifications Valid Over Full Operating Temperature Range VALUE PARAMETER CONDITIONS MIN TYP MAX UNITS Supply Input Voltage Range 6 14 V ADC Total Unadjusted Error V 1V 0.25 % IN ADC ADC Voltage Sensing Input Range Differential Voltage: V = (V V ) 0 6 V IN ADC SENSEP n SENSEM n GLOSSARY OF TERMS The following list contains terms used throughout the PMBus An industry standard power-management proto- document. col with a fully defined command language that facilitates communication with power converters and other devices Channel The collection of functions that monitor, super- in a power system. vise, and trim a given power supply rail. Rail The final output voltage that the power supply con- EEPROM Nonvolatile memory (NVM) storage used to troller manages. retain data after power is removed. Supervise The act of quickly responding to a voltage, Margin Term used typically in board level testing that current, temperature condition that is compared to pre- increases/decreases the output voltage to look for sensi- programmed values (fault settings). tivity/marginality problems Trim The act of adjusting the final output voltage. A Monitor The act of measuring voltage, current, and tem- servo loop is typically used to trim the voltage. perature readings. NVM Nonvolatile memory, see EEPROM. Rev. A 2