TUSB320 datasheet(23/35 Pages) TI1

23 / 35 page

TUSB320, TUSB320I

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SLLSEN9C – MAY 2015 – REVISED SEPTEMBER 2016

Product Folder Links: TUSB320 TUSB320I

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

TUSB320 device is in DFP 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 a DFP mode, a bulk capacitance of at least 120µF is required. In this particular case, a 150-

µF capacitor was chosen.

8.2.2.3 Application Curves

Figure 13. Application Curve for DFP in I2C Mode

TUSB320 Datasheet(PDF) 23 Page - Texas Instruments