STUSB1600 datasheet(13/69 Pages) STMICROELECTRONICS

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STUSB1600

Features description

3.1

CC interface

The STUSB1600 controls the connection to the configuration channel (CC) pins, CC1 and

CC2, through two main blocks: the CC line interface block and the CC control logic block.

The CC line interface block is used to:

•

Configure termination mode on the CC pins relative to the power mode supported i.e.

pull-up for source power role and pull-down for sink power role.

•

Monitor the CC pin voltage values relative to the attachment detection thresholds

•

Configure VCONN on the unconnected CC pin when required

•

Protect the CC pins against overvoltage

The CC control logic block is used to:

•

Execute the Type-C FSM relative to the Type-C power mode supported

•

Determine the electrical state for each CC pin relative to the detected thresholds

•

Evaluate the conditions relative to the CC pin states and the VBUS voltage value to

transition from one state to another in the Type-C FSM.

•

Detect and establish a valid source-to-sink connection

•

Determine the attached device mode: source, sink or accessory

•

Determine cable orientation to allow external routing of the USB data

•

Manage VBUS power capability: USB default, Type-C medium or Type-C high current

mode.

•

Handle hardware faults

The CC control logic block implements the Type-C FSMs corresponding to the

following Type-C power modes:

•

Source power role with accessory support

•

Sink power role with accessory support

•

Sink power role without accessory support

•

Dual power role with accessory support

•

Dual power role with accessory and Try.SRC support

•

Dual power role with accessory and Try.SNK support

The default Type-C power mode is selected through NVM programming (see

Section 6: Start-up configuration) and can be changed by software during operation

through the I2C interface (see Section 5.1: Register description).

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