The INT_N/OUT3 pin is used to notify the PMIC when a change in the TUSB320 I2C registers occurs. This pin is

an open drain output and requires an external pullup resistor. The pin should be pulled up to VDD using a 200-kΩ

resistor.

The Type-C port mode is determined by the state of the PORT pin. When the PORT pin is pulled low, the

TUSB320 device is in UFP mode. The Type-C port mode can also be controlled by the MODE_SELECT register

through the I2C interface when the TUSB320 device is in the unattached state.

The VBUS_DET pin must be connected through a 900-kΩ resistor to VBUS on the Type-C that is connected. This

large resistor is required to protect the TUSB320 device from large VBUS voltage that is possible in present day

systems. This resistor along with internal pulldown keeps the voltage observed by the TUSB320 device in the

recommended range.

The USB2 specification requires the bulk capacitance on VBUS based on UFP or DFP. When operating the

TUSB320 device in an UFP mode, a bulk capacitance between 1 to 10 µF is required. In this particular case, a

1-µF capacitor was chosen.

8.2.3.3 Application Curves

Figure 8-12. Application Curve for UFP in I2C Mode

TUSB320, TUSB320I

SLLSEN9F – MAY 2015 – REVISED MARCH 2022

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