7.2.1 DRP in I2C Mode

Figure 7-1 shows the TUSB322I device configured as a DRP in I2C mode.

VBUS

DP

DM

CC1

CC2

TUSB322

CC2

CC1

VBUS_DET

900K

USB VBUS Switch

(optional BC 1.2 support for legacy)

DM_IN

DP_IN

VOUT

DM_OUT

DP_OUT

VIN

150uF

System VBUS

100nF

VDD_5V

USB3

and

PMIC

4.7K

4.7K

SDA/OUT1

SCL/OUT2

INT_N/OUT3

ID

200K

200K

I2C I/O

1.8V or 3.3V

EN

SCL

SDA

FAULT#

DM

DP

PS_EN

PS_FAULT#

VBUS

ID

INT#

SCL

SDA

1uF

OEN

A0P

A0N

A1P

A1N

B0P

B0N

B1P

B1N

C0P

C0N

C1P

C1N

SEL

TXN1

TXP1

RXN1

RXP1

TXP2

TXN2

RXP2

RXN2

TXN1

TXP1

RXN1

RXP1

TXP2

TXN2

RXP2

RXN2

SSTXP

SSTXN

SSRXP

SSRXN

VCC_3.3V

10K

VCC_3.3V

100nF

100nF

100nF

100nF

100uF

VCONN bulk

cap

Copyright © 2016, Texas Instruments Incorporated

B1

A1

A12

B12

A2

A3

A4

A5

A11

A6

A7

A8

A9

A10

B2

B3

B4

B5

B6

B7

B8

B9

B10

B11

B2

Figure 7-1. DRP in I2C Mode Schematic

7.2.1.1 Design Requirements

For the design example, use the parameters listed in Table 7-1.

Table 7-1. Design Requirements for DRP in I2C Mode

DESIGN PARAMETER

VALUE

VDD (4.5 to 5.5 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)

DRP

MODE_SELECT register = 2'b00.

VCONN Support

Yes

7.2.1.2 Detailed Design Procedure

The TUSB322I device supports a VDD in the range of 4.5 V to 5.5 V. In this particular use case, 5 V is connected

to the VDD pin. Because VCONN support is required for a DRP, the 5 V on VDD meets the USB Type-C VCONN

TUSB322I

SLLSEO5D – OCTOBER 2015 – REVISED MARCH 2021

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