The PMBus Working Group has announced a revision to the PMBus open-standard digital power management protocol. A key feature of the new PMBus+ V1.3 spec will be the inclusion of a dedicated Adaptive Voltage Scaling (AVS) bus to control processor voltages statically and dynamically.
Adaptive-voltage scaling is a closed-loop real-time feedback voltage control system that can handle process and temperature variation between devices to continuously update the voltage requested from the power supply, thus offering significant potential power consumption savings. This feature is expected to have broad implications for manufacturers of FPGAs, ASICs, SoCs, and processors in the networking, communications, and computing markets.
The new PMBus+ V1.3 specification will include a dedicated Adaptive Voltage Scaling (AVS) bus to control processor voltages statically and dynamically.
PMBus+ V1.3 will also include higher speed communication to reduce latencies, as well as other enhancements over V1.2. The initial revised PMBus+ V1.3 specification will be presented at the Darnell Power Forum on September 12.
A variant of the System Management Bus, PMBus features a fully defined command language and transport and physical interface, and is designed to facilitate communication with power converters and other devices in a power system. The current PMBus specification has been adopted by over forty IC and power supply manufacturers.