STUSB1602 datasheet(10/39 Pages) STMICROELECTRONICS

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It allows detection of unexpected VBUS voltage conditions such as undervoltage or overvoltage relative to the valid

VBUS voltage range. When such conditions occur, the STUSB1602 reacts as follows:

•

At attachment, it prevents the source-to-sink connection and the VBUS power path assertion

•

After attachment, it deactivates the source-to-sink connection and disables the VBUS power path. In source

power role, the device goes into error recovery state. In sink power role, the device goes into unattached

state.

The VBUS voltage value is adjusted automatically at attachment (vSafe5V) and via MCU at each PDO transition.

Monitoring is then disabled during T_PDO_transition (i.e. the default value of 300 ms is changed through NVM

programming). Additionally, if a transition occurs to a lower voltage, the discharge path is activated during this

time.

The valid VBUS voltage range is defined from the VBUS nominal voltage by a high threshold voltage and a low

threshold voltage whose nominal values are respectively VBUS +5% and VBUS -5%. The nominal threshold limits

can be shifted by a fraction of VBUS from +1% to +15% for the high threshold voltage and from -1% to -15% for

the low threshold voltage. This means the threshold limits can vary from VBUS +5% to VBUS +20% for the high

limit and from VBUS-5% to VBUS -20% for the low limit.

The threshold limits are preset by default in NVM (see Section 8.3 Electrical and timing characteristics). The

threshold limits can be changed independently through NVM programming (see Section 6 Start-up configuration)

and also by software during attachment through the I²C interface.

3.3.2

VBUS discharge

The monitoring block also handles the internal VBUS discharge path connected to the VBUS_SENSE pin. The

discharge path is activated at detachment, or when the device goes into the error recovery state whatever the

power role (see Section 3.7 Hardware fault management).

The VBUS discharge path is enabled by default in NVM and can be disabled through NVM programming only

(see Section 6 Start-up configuration). The discharge time duration is also preset by default in NVM (see

Section 8.3 Electrical and timing characteristics). The discharge time duration can be changed through NVM

programming (see Section 6 Start-up configuration) and also by software through the I²C interface.

3.3.3

VBUS power path assertion

The STUSB1602 can control the assertion of the VBUS power path on the USB Type-C port, directly or indirectly,

through the VBUS_EN_SRC pin and VBUS_EN_SNK pins according to the system power role.

The tables below summarize the configurations and the operation conditions that determine the electrical value of

the VBUS_EN_SRC and VBUS_EN_SNK pins during system operations.

Table 5. Conditions for VBUS power path assertion in source power role

Electrical

value

Operation conditions

Comment

Type-C attached state

VDD pin monitoring

VBUS_SENSE pin monitoring

VBUS_EN_SRC

Attached.SRC or

UnorientedDebug

Accessory.SRC

or OrientedDebug

Accessory.SRC

VDD > UVLO if

VDD_UVLO enabled

and/or

VDD < OVLO if

VDD_OVLO enabled

VBUS is 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

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

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.

STUSB1602

VBUS power path control

DS11254 - Rev 5

page 10/39

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