FUSB307BVMPX datasheet(14/57 Pages) ONSEMI

14 / 57 page

FUSB307B

www.onsemi.com

Figure 13. Transition to vSafe5V on Power Up

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

FUSB307B

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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