STUSB1602 datasheet(17/55 Pages) STMICROELECTRONICS

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STUSB1602

Features description

3.4

VCONN supply

3.4.1

VCONN input voltage

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

cables and other accessories. The VCONN nominal operating voltage is 5.0 V ±5 %.

3.4.2

VCONN application conditions

The 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:

•

The device is configured in source power role or dual power role

•

VCONN power switches are enabled

•

A valid connection to a sink is achieved

•

Ra presence is detected on the unwired CC pin

•

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

threshold.

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

3.4.3

VCONN monitoring

The VCONN monitoring block detects whether the VCONN power supply is available on the

VCONN pin. It is used to check that the VCONN voltage is above a predefined undervoltage

lockout (UVLO) threshold to allow 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 with 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.

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