STUSB1602 datasheet(12/39 Pages) STMICROELECTRONICS

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The device is configured in source power role

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VCONN power switches are enabled

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A valid connection to a sink is achieved

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Ra presence is detected on the unwired CC pin

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A valid power source is applied to the VCONN pin with respect to a predefined UVLO threshold

The STUSB1602 does not provide VCONN when it is in sink power role.

3.4.3

VCONN monitoring

The VCONN monitoring block detects if VCONN power supply is available on the VCONN pin. It is used to check that

VCONN voltage is above a pre-defined undervoltage lockout (UVLO) threshold to allow the enabling of the VCONN

power switches.

The default value of the UVLO threshold is 4.65 V typical for powered cables operating at 5 V. This value can be

changed by software to 2.65 V typical to support VCONN-powered accessories that operate down to 2.7 V.

3.4.4

VCONN discharge

The behavior of Type-C FSMs is extended to an internal VCONN discharge path capability on the CC pins

in source power mode only. The discharge path is activated during 250 ms from sink detachment detection.

This feature is disabled by default. It can be activated through NVM programming (see Section 6 Start-up

configuration) and also by software through the I²C interface.

3.4.5

VCONN control and status

The supplying conditions of VCONN across the STUSB1602 are managed through the I²C interface. Different I²C

registers and bits are used specifically for this purpose.

3.4.6

VCONN power switches

Features

The STUSB1602 integrates two current limited high-side power switches with protection that tolerates high

voltage up to 22 V on the CC pins.

Each VCONN power switch presents the following features:

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Soft-start to limit inrush current

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Constant current mode overcurrent protection

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Adjustable current limit

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Thermal protection

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Undervoltage and overvoltage protections

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Reverse current and reverse voltage protections

STUSB1602

VCONN supply

DS11254 - Rev 5

page 12/39

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