FUSB308B datasheet(13/53 Pages) ONSEMI

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FUSB308B

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Figure 11. Transition to vSafe5V from SRC_HV Controlled Path (FUSB308B)

Accepted Default Voltage

Policy Engine requests for VBUS transition

to default vSafe5V

Read

ALERT

ALERT.I_PORT_PWR=1b?

Enable vSafe5V Voltage Path

SRC = High

SRC_HV = Low

Apply Rforce_disch to VBUS

Service other

ALERTS

FUSB308B

TCPM

Read ALERT

Read PWRSTAT

Sourcing High Voltage on VBUS

PWRSTAT.SOURCE_VBUS=0b

PWRSTAT.SOURCE_HV=1b

SRC = Low

SRC_HV = High

Yes

Prepare FUSB307/8 for HV Transition

Write:

PWRCTRL.DIS_VALARM=1b

PWRCTRL.AUTO_DISCH=0b

VBUS_STOP_DISCH = vSafe5V (max)

Voltage Transition Complete

Set PWRSTAT.SOURCE_HV =0b

Set PWRSAT.SOURCE_VBUS=1b

Set ALERT.I_PORT_PWR = 1b

Initiate Transition

Write:

COMMAND.SourceVbusDefaultVoltage

PWRCTRL.FORCE_DISCH=1b

VBUS_STOP_DISCH Done

Sourcing vSafe5V

Notify Policy Engine that voltage

transition is complete

Transition to vSafe5V using SRC_HV Path

The TCPM Shall Not disable

FORCE_DISCH during transition

Configure Device for vSafe5v

PWRCTRL.AUTO_DISCH=1b

Write VALARMCFG

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