FUSB308BVMPX datasheet(14/53 Pages) ONSEMI

14 / 53 page

FUSB308B

www.onsemi.com

Figure 12. Transition to High Voltage using SRC Controlled Path VBUS

Accepted High Voltage

Policy Engine requests for VBUS transition

to high voltage

Read

ALERT

ALERT.I_VALARM_HI=1b?

Enable Monitoring of VBUS

SRC = High

Monitor VALARMHCFG

Service other

ALERTS

FUSB30x

TCPM

Read ALERT

Sourcing vSafe5V

PWRSTAT.SOURCE_VBUS=1b

PWRSTAT.SOURCE_HV=0b (if 307/8)

SRC = High

Yes

Enable Monitoring of VBUS

Write:

PWRCTRL.AUTO_DISCH=0b

PWRCTRL.DIS_VALARM=0b

VALARMHCFG = vNewSrc (Min)

Set ALERTL.I_VBUS_ALARM_HI

Transition HV Source

Enable external source path or transition existing

Source to HV

VALARMH Trip?

Notify Policy Engine that voltage

transition is complete

Setup FUSB305 for HV Sourcing

Write:

VALARML/HCFG

PWRCTRL.AUTO_DISCH=1b

Sourcing HV via SRC

Transition to HV using SRC enabled Path

NOTE: Transitioning from HV on SRC to vSafe5v also on SRC can be done

by using Voltage Alarm Low.

Power supply is responsible for transitioning voltages to meet USB PD

spec− no discharge necessary.

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