Revision 1.3 of the PMBus specification introduced the enhanced version of PMBus with AVS. PMBus 1.3 includes:
- Higher speed communication to reduce latencies
- A dedicated Adaptive Voltage Scaling (AVS) bus to statically and dynamically control processor voltages
- General enhancements and improvements from 1.2
Revision 1.3.1 of the PMBus specification includes clarifications to streamline implementation.
PMBus adopters in good standing can download the latest released PMBus 1.3.1 specification by logging in and going to the home page. All others can get the specification by emailing GetPMBusSpec@SMIForum.org. Be sure to include your request, your full name, and your company name in text in English in the body of your email. (Note: We may use the email address you supply to contact you regarding PMBus.) Normally, the specification will be delivered to you by email before the end of the next business day.
Older PMBus specifications are publicly available for download on the Older Specifications page.
See below for additional information on PMBus 1.3:
SMBus 3.0 Specification
Older versions of the SMBus specification can be found on the
SMBus Specifications page on the SMBus web site.
Technical questions about specifications should be sent to