STUSB1602 datasheet(16/55 Pages) STMICROELECTRONICS

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Features description

STUSB1602

16/55

DocID028319 Rev 2

As specified in the USB Type-C standard specification, the attached state “Attached.SRC” is

reached only if the voltage on the VBUS receptacle side is at vSafe0V condition when a

connection is detected.

“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 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.

“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. The

VBUS_EN_SRC pin is maintained asserted as long as the device is attached and a valid

voltage condition on the VBUS is met.

Table 7. 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 if

VBUS _VALID_RANGE

disabled

The signal is

de-asserted

when at

least one

non valid

operation

condition is

met

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