Intel Corporation
APPARATUS AND METHOD TO REDUCE STANDBY POWER FOR SYSTEMS IN BATTERY MODE WITH A CONNECTED BUS POWERED DEVICE

Abstract:

A power saving apparatus and method for a host system to proactively decide to save power and increase battery life when bus powered peripheral devices are connected to the System's Type-C ports. The Host (or Host System) decides if a Bus Powered Device (BPD), hub or a peripheral device requires application services, or a device-initiated wake based on wake policies of a respective Universal Serial Bus (USB) 3.2, Thunderbolt 3 (TBT3), USB4, Display Port (DP) Protocol. Thereafter, the Host decides based on S0, Low Power System standby entry--wake time latency requirement along with Type-C IO Protocol policies, to trigger the system power delivery (PD) Controller to remove power to the BPD. To save power, the Host System Wake logic power partition is also powered off.