TUSB320LI datasheet(27/38 Pages) TI1

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TUSB320HI, TUSB320LI

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SLLSEP2B – AUGUST 2015 – REVISED SEPTEMBER 2016

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8.2.3.1 Design Requirements

For this design example, use the parameters listed in Table 16:

Table 16. Design Requirements for UFP in I2C Mode

DESIGN PARAMETER

VALUE

VDD (2.75 V to 5 V)

5 V

Mode (I2C or GPIO)

I2C: ADDR pin must be pulled down or pulled up

I2C address (0x67 or 0x47)

0x47: ADDR pin must be pulled low or tied to GND

Type-C port type (UFP, DFP, or DRP)

UFP: PORT pin is pulled down

Shutdown support

8.2.3.2 Detailed Design Procedure

The TUSB320 device supports a VDD in the range of 2.75 V to 5 V. In this particular case, VDD is set to 5 V. A

100-nF capacitor is placed near VDD. If VBUS is guaranteed to be less than 5.5 V, powering the TUSB320 device

through a diode can be implemented.

The TUSB320 device is placed into I2C mode by either pulling the ADDR pin high or low. In this case, the ADDR

pin is tied to GND which results in a I2C address of 0x47. The SDA and SCL must be pulled up to either 1.8 V or

3.3 V. When pulled up to 3.3 V, the VDD supply must be at least 3 V to keep from back-driving the I

2C interface.

The TUSB320L device can enter shutdown mode by pulling the EN_N pin high, which puts the TUSB320L device

into a low power state. In this case, external control of the EN_N pin is not implemented and therefore the EN_N

pin is tied to GND. The TUSB320H device can enter shutdown mode by pulling the EN pin low, which puts the

TUSB320H device into a low power state. In this case, external control of the EN pin is not implemented and

therefore the EN pin is tied to 1.8V or 3.3V.

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.

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 UFP mode, a bulk capacitance between 1 to 10µF is required. In this particular case, a 1-

µF capacitor was chosen.

8.2.3.3 Application Curves

Figure 21. Application Curve for UFP in I2C Mode

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