FUSB307BVMPX datasheet(17/57 Pages) ONSEMI

17 / 57 page

FUSB307B

www.onsemi.com

Discharge during a Connection

The discharge functions can be manually activated via the

PWRCTRL.FORCE_DISCH

The

discharge

pull−down is specified by RFULL_DISCH. The FUSB307B

will automatically disable discharge when VBUS reaches

VBUS_STOP_DISC threshold

Figure 16. Sink Discharge during a Connection

PWRCTRL.FORCE_DISCH

Apply RFORCE

VBUS_STOP_DISC

time

VBUS

tSrcSettle

vSrcNew

Sink Discharge during a Connection

When the device is operating as a sink and it receives a

Hard Reset or a Power Role Swap, the automatic discharge

circuitry and SNK output will be disabled by the host

processor to avoid a disconnect detection.

Watchdog Timer

The watchdog timer functionality is enabled whenever

TCPC_CTRL.EN_WATCHDOG is set to 1b. The watchdog

timer should only be enabled after an attach when the device

Attached.Src,

Attached.Snk

Apply.ROLECONTROL states. The watchdog timer starts

when any of the interrupts that are not masked in the Alert

watchdog timer is cleared on an I2C access by the TCPM

(either read or write). If the INTB pin is still asserted after

this I2C access, the watchdog timer will reinitialize and start

monitoring again until all of the Alerts are cleared or until

the INTB pin is de−asserted.

When the watchdog timer expires, the FUSB307B will

immediately disconnect the CC terminations by setting

ROLE_CONTROL bits

3..0

1111b,

disable

all

SRC/SRC_HV or SNK outputs, discharge VBUS to

vSafe0V, and set FAULT_STATUS.I2CInterfaceError.

FUSB307BVMPX Datasheet(PDF) 17 Page - ON Semiconductor

FUSB307BVMPX Datasheet(HTML) 17 Page - ON Semiconductor

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