STUSB4710AQ1TR datasheet(12/34 Pages) STMICROELECTRONICS

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Block descriptions

STUSB4710

12/34

DocID030499 Rev 4

3.6.3

VBUS power path assertion

The STUSB4710 can control the assertion of the VBUS power path on USB Type-C port,

directly or indirectly, through VBUS_EN_SRC pin.

The following table summarizes the configurations and the conditions that determine the

logic value of VBUS_EN_SRC pin during system operation.

Table 5: Conditions for VBUS power path assertion

Electrical

value

Operation conditions

Comment

Attached state

VDD monitoring

VBUS monitoring

VBUS_EN_SRC

Attached.SRC

VDD > UVLO if

VDD_UVLO

enabled

and/or VDD <

OVLO if

VDD_OVLO

enabled

VBUS within valid

voltage range

if VBUS

_VALID_RANGE

enabled

or VBUS > UVLO if

VBUS

_VALID_RANGE

disabled

The signal is

asserted only if all

the valid operation

conditions are

met.

UnorientedDebug

Accessory.SRC

OrientedDebug

Accessory.SRC

HiZ

Any other state

VDD < UVLO if

VDD_UVLO

enabled

and/or VDD >

OVLO if

VDD_OVLO

enabled

VBUS is out of valid

voltage range

if VBUS

_VALID_RANGE

enabled

or VBUS < UVLO if

VBUS

_VALID_RANGE

disabled

The signal is de-

asserted when at

least one non-

valid operation

condition is met.

Activation of the UVLO and OVLO threshold detections can be done through NVM

programming (see Section 4: "User-defined startup configuration") and also by

software through the I2C interface (see Section 6: "I²C register map"). When the

UVLO and/or OVLO threshold detection is activated, the VBUS_EN_SRC pin is

asserted only if the device is attached and the valid threshold conditions on VDD

are met. Once the VBUS_EN_SRC pin is asserted, the VBUS monitoring is done

on VBUS_SENSE pin instead of the VDD pin.

3.7

High voltage protection

The STUSB4710 can be safely used in systems or connected to systems that handle high

voltage on the VBUS power path. The device integrates an internal circuitry on the CC pins

that tolerates high voltage and ensures a protection up to 22 V in case of unexpected short

circuit with VBUS or in case of connection to a device supplying high voltage on VBUS.

3.8

Hardware fault management

The STUSB4710 handles hardware fault conditions related to the device itself and the VBUS

power path during system operation.

When such conditions occur, the circuit goes into a transient error recovery state named

ErrorRecovery in the Type-C FSM. When entering in this state, the device de-asserts the

VBUS power path by disabling the VBUS_EN_SRC pin, and it removes the terminations

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