FUSB307BVMPX datasheet(19/57 Pages) ONSEMI

19 / 57 page

FUSB307B

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Fast Role Swap Cable Disconnect

(Informational Only)

The Initial Sink device waiting for FRSwap will not

disconnect on VBUS since PWRCTRL.AUTO_DISCH

will be set to zero by the TCPM. If the Type−C cable

detaches while the Initial Sink is ready for a FRSwap, it will

look like the Initial Source has initiated a FRSwap; The CC

lines will be driven to GND by Rd.

The initial Sink will perform the FRSwap and the TCPM

will initiate the FR_Swap message. Since there is no device

attached, there will be no GoodCRC response which will

transition to Type−C Error Recovery.

Figure 17. Fast Role Swap Flow Diagram

Sourcing VBUS

Swap request Detected

Issue a PD_RESET

SNK = Low (FUSB305/6)

SRC = High

Interrupt ALERT_VD.SWAP_RX

HUB FUSB305/6/7 Initially

Acting as Source

Sinking VBUS

System Loses Power source

Initiate Fast Swap Signal

Hub TCPM Writes: SRC_FRSWAP.FRSWAP = 1b

FUSB30x will:

Drive SRC = 0b

Issue a PD_RESET

Drive CC to GND with rFRSwapTx

CC < vFRSwapCableTx

debounced for tFRSwapRx?

Host FUSB305/6/7

Initially Acting as Sink

Prepare System for FRSwap

Host TCPM Writes:

SNK_FRSWAP.EN_SWAP_DTCT

PWRCTRL.AUTO_DISCH=0b

Source Parameters

rFRSwapTx −> 5 Ohm (max)

Sink Parameters

tFRSwapRx -> 30us (min) to 50 μs(max)

vFRSwapCableTx −> 490mV (min), 520mV (typ), 550mV (max)

FRSWAP drives CC Line

that is transmitting BMC

low with rFRSwapTx for

tFRSwapTx

Sinking VBUS

Discard any pending PD

Messages

tFRSwapTx done?

If (!SRC_FRSWAP.MANUAL_SNK_EN)

Wait FRSWAP_SNK_DELAY[1:0]

Start Sinking

If(SRC_FRSWAP.MANUAL_SNK_EN)

Hub TCPM Writes: COMMAND.SinkVbus

Else

{Drive SNK=1b

Set PWRSTAT.SNKVBUS=1}

Set Rp to SinkTxOk

Hub TCPM Writes:

ROLECTRL.RP_VAL = 10b

Drive SNK = 1b

Set PWRSTAT.SNKVBUS = 1

(!SRC_FRSWAP.MANUAL_SNK_EN &&

FRWAP_SNK_DELAY == 00b)?

tFRSwapTx −> 60

μs (min) to 120 μs (max)

tSrcFRSwap −> 150

μs (max)

•

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