TUSB1104 datasheet(42/55 Pages) TI

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10 Design Requirements

For this design example, use the parameters shown in Table 10-1.

Table 10-1. Design Parameters

PARAMETER

VALUE

10Gbps USB 3.2 pre-channel A to B PCB trace length, XAB.

Refer to Figure 9-1.

2 inches <= XAB <= 12 inches - XCD

10Gbps USB post-channel C to D PCB trace length, XCD. Refer

to Figure 9-1.

up to 4 inches

Minimum distance of the AC capacitors from TUSB1104, LAC-

CAP

0.4 inches

Maximum distance of ESD component from the USB

receptacle, LESD

1.0 inches

Maximum distance of series resistor (RESD) from ESD

component, LR_ESD.

0.25 inches

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

220 nF

CAC-USB2 AC-coupling capacitor (297 nF to 363 nF)

Options:

•

RX1 and RX2 are DC-coupled to

USB receptacle

•

330 nF AC-couple with RRX resistor

Optional RRX resistor (220-kΩ ± 5%)

No used

RESD (0-Ω to 2.2-Ω)

1-Ω

VCC supply (3-V to 3.6-V)

3.3-V

I2C Mode or Pin-strap Mode

I2C Mode. (MODE = "F")

1.8-V or 3.3-V I2C Interface

3.3-V I2C. VIO_SEL pin to Float "F".

11 Detailed Design Procedure

A typical usage of the TUSB1104 device is shown in Figure 11-1. The device can be configure either through

its GPIO pins or through its I2C interface. In the following example, a Type-C PD controller or microcontroller is

used to configure the device through the I2C interface. In I2C mode, the equalization settings for each receiver

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

and CEQ[1:0]) can be left unconnected. If these pins are left unconnected, the TUSB1104 7-bit I2C target

address will be 0x12 because both SSEQ1/A1 and SSEQ0/A0 will be at pin level F. If a different I2C target

address is desired, SSEQ1/A1 and SSEQ0/A0 pins should be set to a level which produces the desired I2C

target address.

TUSB1104

SLLSFL1 – APRIL 2022

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