TUSB322I

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SLLSEO5 – OCTOBER 2015

7.3.4.1 Audio Accessory

Audio accessory mode is supported through two types of adapters. First, the passive audio adapter can be used

to convert the Type-C connector into an audio port. To effectively detect the passive audio adapter, the

TUSB322I device must detect a resistance that is less than Ra on both of the CC pins.

Secondly, a charge through audio adapter can be used. The primary difference between a passive and charge

through adapter is that the charge through adapter supplies 500 mA of current over VBUS. The charge through

connection.

When the TUSB322I device is configured in GPIO mode, OUT3 pin determines if an audio accessory is

connected. When an audio accessory is detected, the OUT3 pin is pulled low.

7.3.4.2 Debug Accessory

Debug is an additional state supported by USB Type-C. The specification does not define a specific user

scenario for this state, but the end user could use debug accessory mode to enter a test state for production

specific to the application. Charge through debug accessory is not supported by TUSB322I when in DRP or UFP

mode. The TUSB322I when configured as a DFP-only or as a DRP acting as a DFP will detect a debug

accessory which presents Rd on both CC1 and CC2 pins. The TUSB322I will set ACCESSORY_CONNECTED

register to 3'b110 to indicate a UFP debug accessory. The TUSB322I when configured as a UFP-only or as a

DRP acting as a UFP will detect a debug accessory which presents Rp on both CC1 and CC2 pins. The

TUSB322I will set ACCESSORY_CONNECTED register to 3b'111 to indicate a DFP debug accessory.

ADDR pin is a tri-level control pin. When the ADDR pin is left floating (NC), the TUSB322I device is in GPIO

All outputs for the TUSB322I device are open drain configuration.

The OUT1 and OUT2 pins are used to output the Type-C current mode when in GPIO mode. Additionally, the

OUT3 pin is used to communicate the audio accessory mode in GPIO mode. Table 5 lists the output pin settings.

See Table 2 for more information on the pins and their uses.

Table 5. Simplified Operation for OUT1 and OUT2

OUT1

OUT2

DESCRIPTION

H

H

Default current in unattached state

H

L

Default current in attached state

L

H

Medium current (1.5 A) in attached state

L

L

High current (3.0 A) in attached state

when the TUSB322I device updates the registers with new information. The INT_N pin is open drain. The

INTERRUPT_STATUS register will be set when the INT_N pin is pulled low. To clear the INTERRUPT_STATUS

When operating in GPIO mode, the OUT3 pin is used in place of the INT_N pin to determine if an audio

accessory is detected and attached. The OUT3 pin is pulled low when an audio accessory is detected.

NOTE

determine the attachment and detachment of a UFP and to determine the entering and exiting of accessary

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