TUSB320 datasheet(21/35 Pages) TI1

21 / 35 page

TUSB320, TUSB320I

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SLLSEN9C – MAY 2015 – REVISED SEPTEMBER 2016

Product Folder Links: TUSB320 TUSB320I

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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 ID pin is used to indicate when a connection has occurred if the TUSB320 device is a DFP while configured

for DRP. An OTG USB controller can use this pin to determine when to operate as a USB Host or USB Device.

When this pin is driven low, the OTG USB controller functions as a host and then enables VBUS. The Type-C

standard requires that a DFP not enable VBUS until it is in the Attached.SRC state. If the ID pin is not low but

VBUS is detected, then OTG USB controller functions as a device. The ID pin is open drain output and requires

an external pullup resistor. It 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 not connected, the

TUSB320 device is in DRP 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 DRP mode, it alternates between UFP and DFP. If the TUSB320 device connects as a

UFP, the large bulk capacitance must be removed. The FET in Figure 10 performs this task.

Table 9. USB2 Bulk Capacitance Requirements

PORT CONFIGURATION

MIN

MAX

UNIT

Downstream facing port (DFP)

120

µF

Upstream facing port (UFP)

µF

8.2.1.3 Application Curves

Figure 11. Application Curve for DRP in I2C Mode

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