Provider: TI Online Technical Support Community SmartReflex-AVS is a technology that uses adaptive power supply to achieve the goal of reducing active power consumption. DM816x devices have Class 2B implementation of smart reflex and this allows dynamic AVS using software. PMBus specific driver support is required for PMICs such as TP40400 present in DM816x-based devices. PMBus is an open standard protocol that defines a means of communicating with power conversion and other devices. It is a communications protocol based on I2C. Hence, it is just a specification or a wrapper over I2C.