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TUSB320HI, TUSB320LI

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SLLSEP2B – AUGUST 2015 – REVISED SEPTEMBER 2016

Product Folder Links: TUSB320HI TUSB320LI

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Copyright © 2015–2016, Texas Instruments Incorporated

(1)

Required; not in sequential order.

7.3 Device Functional Modes

The TUSB320 device has four functional modes. Table 4 lists these modes:

Table 4. USB Type-C States According to TUSB320 Functional Modes

MODES

GENERAL BEHAVIOR

PORT PIN

Unattached

USB port unattached. ID, PORT

configure according to PORT pin.

UFP

Unattached.SNK

AttachWait.SNK

DRP

Toggle Unattached.SNK

→ Unattached.SRC

AttachedWait.SRC or AttachedWait.SNK

DFP

Unattached.SRC

AttachWait.SRC

Active

USB port attached. All GPIOs

UFP

Attached.SNK

Audio accessory

Debug accessory

DRP

Attached.SNK

Attached.SRC

Audio accessory

Debug accessory

DFP

Attached.SRC

Audio accessory

Debug accessory

Dead battery

No operation.

UFP/DRP/DFP

Default device state to UFP/SNK with Rd.

Shutdown

TUSB320L's EN_N pin high.

TUSB320H's EN pin low.

UFP/DRP/DFP

Default device state to UFP/SNK with Rd.

7.3.1 Unattached Mode

Unattached mode is the primary mode of operation for the TUSB320 device, because a USB port can be

operational. After the TUSB320 device is powered up, the part enters unattached mode until a successful attach

has been determined. Initially, right after power up, the TUSB320 device comes up as an Unattached.SNK. The

TUSB320 device checks the PORT pin and operates according to the mode configuration. The TUSB320 device

the mode configuration or port role if the board configuration of the PORT pin is not the desired mode. Writing to

at reset (TUSB320L's EN_N high to low transition or TUSB320H's EN low to high transition), after