By sampling the current on each of the four outputs every millisecond and accumulating those readings the accuracy of the power monitoring is greatly improved over what can be accomplished through a limited I 2C interface. Able to accumulate up to 512 data points, the ME (Management Engine) need only pole the XRP7725 for data ever 0.5 seconds without losing information about the average power flow in the system. This feature can also be used by any non-server applications requiring accurate dynamic power monitoring at all levels.
This programmable power system offers full control via a SMBus compliant I 2C interface allowing for advanced local- and remote-reconfiguration, full performance monitoring and reporting, as well as fault handling. The output voltages can be programmed from 0.6V up to 5.5V without requiring any external components. The XRP7725 comes with the PowerArchitect 5.1 design and configuration software which provides tools to optimise the current monitoring.
With hierarchical power-data gathering, Exar says that, “Data centre managers can now have deeper insight into power usage in the system by expanding the power system monitoring to the system rails as opposed to just the processor and memory without injecting prohibitive cost into their system. The days of data centres just monitoring power at the PDU or rack level will shortly be over.”
XRP7725 comes in a 7 x 7mm TQFN package for $8.29 (1000).