SLVAFG6A December 2022 – November 2023 TPS25762-Q1 , TPS25772-Q1
SPM Engine Parameters | Configuration | Description |
---|---|---|
Total USB VBUS Power (System Max Power) | 105 W(1) | Total system power capacity allocated for Port A and B |
Port A Max Power | 60 W | Maximum Port A Power |
Port B Max Power | 45 W | Maximum Port B Power |
Port A Min Power | 15 W | Minimum Port A power |
Port B Min Power | 15 W | Minimum Port B power |
Assured Mode | Max Init Power | Source initially sends Source Capabilities advertising max power |
Three example scenarios of Assured Capacity Policy are listed in Table 5-2. Note that the power distributed to each port is independent of the other port's status as is expected with the Assured Capacity Policy.
Port A | Port B | |
---|---|---|
Initially Allocated | 60 W | 45 W |
Scenario 1: Port A connects to a Sink that requires 27 W. Port B is unconnected. | ||
Power Required by Sink | 27 W | |
Power Distributed to Sink | 27 W | |
Scenario 2: Port B connects to a Sink that requires 45 W. | ||
Power Required by Sink | 27 W | 45 W |
Power Distributed to Sinks | 27 W | 45 W |
Scenario 3: Port A changes the requirement to 60 W. | ||
Power Required by Sink | 60 W | 45 W |
Power Distributed to Sinks | 60 W | 45 W |
The following diagrams show the flow of the PD negotiation when Assured Capacity Policy is enabled and where one Sink first connects to Port A (Figure 5-1) and a second Sink connects to Port B (Figure 5-2).