TUSB320LI datasheet(12/38 Pages) TI1

12 / 38 page

TUSB320HI, TUSB320LI

SLLSEP2B – AUGUST 2015 – REVISED SEPTEMBER 2016

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Product Folder Links: TUSB320HI TUSB320LI

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7.2.3.2 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 it is important because 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 TUSB320

when in DRP or UFP mode.

7.2.4 I2C and GPIO Control

The TUSB320 device can be configured for I2C communication or GPIO outputs using the ADDR pin. The ADDR

pin is a tri-level control pin. When the ADDR pin is left floating (NC), the TUSB320 device is in GPIO output

mode. When the ADDR pin is pulled high or pulled low, the TUSB320 device is in I2C mode.

All outputs for the TUSB320 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 3 lists the output pin settings.

See for more information.

Table 3. Simplified Operation for OUT1 and OUT2

OUT1

OUT2

Default Current in Unattached State

Default Current in Attached State

Medium Current (1.5 A) in Attached State

High Current (3.0 A) in Attached State

When operating in I2C mode, the TUSB320 device uses the SCL and SDA lines for clock and data and the

INT_N pin to communicate a change in I2C registers, or an interrupt, to the system. The INT_N pin is pulled low

when the TUSB320 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

When using the 3.3 V supply for I2C, the end user must ensure that the VDD is 3 V and

above. Otherwise the I2C may back power the device.

7.2.5 VBUS Detection

The TUSB320 device supports VBUS detection according to the Type-C Specification. VBUS detection is used to

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

modes. VBUS detection is also used to successfully resolve the role in DRP mode.

The system VBUS voltage must be routed through a 900-kΩ resistor to the VBUS_DET pin on the TUSB320

device if the PORT pin is configured as a DRP or a UFP. If the TUSB320 device is configured as a DFP and only

ever used in DFP mode, the VBUS_DET pin can be left unconnected.

TUSB320LI Datasheet(PDF) 12 Page - Texas Instruments