TUSB1146 datasheet(48/68 Pages) TI2

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TUSB1146

SLLSFB2 – APRIL 2020

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Typical Application (continued)

9.2.1 Design Requirements

For this design example, use the parameters shown in Table 28.

Table 28. Design Parameters

PARAMETER

VALUE

10Gbps USB3.1 pre-channel A to B PCB trace length, XAB.

Refer to Figure 33.

2 inches <= XAB <= 12 inches - [MAX

(XEF or XGH)]

10Gbps DP pre-channel C to D PCB trace length, XCD. Refer to

Figure 33.

4 inches <= XCD <= 14 inches - [MAX

(XEF or XGH)]

10Gbps USB and DP post channel E to F PCB trace length,

XEF. Refer to Figure 33.

up to 4 inches

10Gbps USB and DP post channel G to H PCB trace length,

XGH. Refer to Figure 33.

up to 4 inches

Minimum distance of the AC capacitors from TUSB1146, LAC-

CAP

0.4 inches

Maximum distance of ESD component from the USB-C

receptacle, LESD

0.5 inches

Maximum distance of series resistor (RESD) from ESD

component, LR_ESD.

0.25 inches

DCI Support (Y/N)

Yes

CAC-USB1 AC-coupling capacitor (75 nF to 265 nF)

220 nF

CAC-USB2 AC-coupling

capacitor (297 nF to 363 nF)

DCI Supported

No AC capacitor. RX1 and RX2 must

be DC coupled to USB-C receptacle.

DCI Not Supported

Options:

•

RX1 and RX2 are DC coupled to

USB-C receptacle

•

330nF AC couple with RRX resistor

•

330nF

couple

without

RRX

resistor

Optional RRX resistor (220kΩ +/- 5%)

No used

CAC-DP AC-coupling capacitor (75 nF to 265 nF)

220 nF

RESD (0 ohms to 2.2 ohms)

1 ohm

VCC supply (3 V to 3.6 V)

3.3 V

I2C Mode or GPIO Mode

I2C Mode. (I2C_EN pin != "0")

1.8V or 3.3V I2C Interface

3.3V I2C. Pull-up the I2C_EN pin to

3.3V with a 1K ohm resistor.

9.2.2 Detailed Design Procedure

A typical usage of the TUSB1146 device is shown in Figure 34. The device can be controlled either through its

GPIO pins or through its I2C interface. In the example shown below, a Type-C PD controller is used to configure

the device through the I2C interface. When configured for I2C mode and system does not support DCI, pins 29

and 32 can be left unconnected. If DCI is supported in the system, then connect through a 22-ohm resistor

DCI_CLK and DCI_DAT to appropriate PCH GPIO pins. In I2C mode, the equalization settings for each receiver

can be independently controlled through I2C registers. For this reason, all of the equalization pins (EQ[1:0],

SSEQ[1:0], and DPEQ[1:0]) can be left unconnected. If these pins are left unconnected, the TUSB1146 7-bit I2C

slave address will be 0x12 because both DPEQ0/A1 and SSEQ0/A0 will be at pin level "F". If a different I2C

slave address is desired, DPEQ0/A1 and SSEQ0/A0 pins should be set to a level which produces the desired

I2C slave address.

TUSB1146 Datasheet(PDF) 48 Page - Texas Instruments

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