STUSB1602 datasheet(11/39 Pages) STMICROELECTRONICS

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Table 6. Conditions for VBUS power path assertion in sink power role

Electrical

value

Operation conditions

Comment

Type-C attached

state

VDD pin

monitoring

VBUS_SENSE pin

monitoring

VBUS_EN_SNK

Attached.SNK

Debug

Accessory.SNK

Not applicable

VBUS is within valid

voltage range if

VBUS

_VALID_RANGE

enabled

VBUS > UVLO if

VBUS

_VALID_RANGE

disabled

The signal is asserted

only if all the valid

operation conditions

are met

Hiz

Any other state

Not applicable

VBUS is out of valid

voltage range if

VBUS

_VALID_RANGE

enabled

VBUS < UVLO

VBUS

_VALID_RANGE

disabled

The signal is de-

asserted when at

least one non valid

operation condition is

met

“Type-C attached state” refers to the Type-C FSM states as defined in the USB Type-C standard specification and

as described in the I²C register CC_OPERATION_STATUS.

“VDD pin monitoring” is valid only in source power role. Activation of the UVLO and OVLO threshold detections

can be done through NVM programming (see Section 6 Start-up configuration) and also by software through

the I²C interface. When UVLO and/or OVLO threshold detection is activated, 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.

“VBUS_SENSE pin monitoring” relies, by default, on a valid VBUS voltage range. The voltage range condition can

be disabled to consider UVLO threshold detection instead. The monitoring condition of the VBUS voltage can be

changed through NVM programming (see Section 6 Start-up configuration) and also by software through the

I²C interface. VBUS_EN_SRC pin is maintained asserted as long as the device is attached and a valid voltage

condition on the VBUS is met.

3.4

VCONN supply

3.4.1

VCONN input voltage

VCONN is a regulated supply used to power circuits in the plug of USB3.1 full-featured cables and other

accessories. VCONN nominal operating voltage is 5.0 V +/- 5%.

3.4.2

VCONN application conditions

VCONN pin of the STUSB1602 is connected to each CC pin (CC1 and CC2) across independent power switches.

The STUSB1602 applies VCONN only to the CC pin not connected to the CC wire when all below conditions are

met:

STUSB1602

VCONN supply

DS11254 - Rev 5

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