STUSB1600 datasheet(14/69 Pages) STMICROELECTRONICS

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Features description

STUSB1600

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DocID028937 Rev 1

3.2

VBUS power path control

3.2.1

VBUS monitoring

The VBUS monitoring block supervises (from the VBUS_SENSE pin) the VBUS voltage on

the USB Type-C receptacle side.

It is used to check that the VBUS is within a valid voltage range:

•

To establish a valid source-to-sink connection according to USB Type-C standard

specifications.

•

To safely enable the VBUS power path through the VBUS_EN_SRC pin or

VBUS_EN_SNK pin depending on the power role.

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

STUSB1600 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 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 the NVM with different shift coefficients

depending on whether the device operates in source power role or in sink power role (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 (see Section 5.1: Register

description).

3.2.2

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 the 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 the 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 (see Section 5.1:

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