8.2 Typical Application

8.2.1 DRP in I2C Mode

Figure 8-7 shows the TUSB320 device configured as a DRP in I2C mode.

A1

A12

B12

B1

A2

A3

A4

A5

A11

A6

A7

A8

A9

A10

B2

B3

B4

B5

B6

B7

B8

B9

B10

B11

VBUS

DP

DM

CC1

CC2

TUSB320

CC1

CC2

VBUS_DET

900 K

USB VBUS Switch

(optional BC 1.2 support for legacy)

DM_IN

DP_IN

VOUT

DM_OUT

DP_OUT

VIN

150 uF

System VBUS

PORT

100 nF

VBAT

USB2

OTG &

PMIC

4.7 K

4.7 K

SDA/OUT1

SCL/OUT2

INT_N/OUT3

ID

200 K

200 K

I2C I/O

1.8 V or 3.3 V

EN

SCL

SDA

FAULT#

DM

DP

PS_EN

PS_FAULT#

VBUS

ID

INT#

SCL

SDA

Disconnect

bulk cap

when UFP

1 uF

Copyright © 2016, Texas Instruments Incorporated

Figure 8-7. DRP in I2C Mode Schematic

8.2.1.1 Design Requirements

For this design example, use the parameters listed in Table 8-1:

Table 8-1. Design Requirements for DRP in I2C Mode

DESIGN PARAMETER

VALUE

VDD (2.75 V to 5 V)

VBAT (less than 5 V)

Mode (I2C or GPIO)

I2C

ADDR pin must be pulled down or pulled up

I2C address (0x61 or 0x60)

0x60

ADDR pin must be pulled low or tied to GND

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

DRP

PORT pin is NC

Shutdown support (EN_N control)

No

8.2.1.2 Detailed Design Procedure

The TUSB320 device supports a VDD in the range of 2.75 V to 5 V. In this particular use case, VBAT which must

be in the required VDD range is connected to the VDD pin. A 100-nF capacitor is placed near VDD.

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 0x60. 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 I2C interface.

The TUSB320 device can enter shutdown mode by pulling the EN_N pin high, which puts the TUSB320 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.

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TUSB320, TUSB320I

SLLSEN9F – MAY 2015 – REVISED MARCH 2022

Copyright © 2022 Texas Instruments Incorporated

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