TUSB1044AI datasheet(46/66 Pages) TI1

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9.2.1 Design Requirements

For this design example, use the parameters shown in Table 9-1.

Table 9-1. Design Parameters

PARAMETER

VALUE

A-to-B PCB trace length, XAB

8 inches (assuming 1dB / inch at 5GHz)

C-to-D PCB trace length, XCD

8 inches (assuming 1dB / inch at 5GHz)

E-to-F PCB trace length, XEF

1.5 inches (assuming 1dB / inch at 5GHz)

G-to-H PCB trace length, XGH

1.5 inches (assuming 1dB / inch at 5GHz)

PCB trace width

4 mils

AC-coupling capacitor (75nF to 265nF)

220nF

VCC supply (3V to 3.6V)

3.3V

I2C Mode or GPIO Mode

I2C Mode

1.8V or 3.3V I2C Interface

3.3VI2C. Pull up the I2C_EN pin to 3.3V with a 1KΩ

resistor

9.2.2 Detailed Design Procedure

A typical usage of the TUSB1044A device is shown in Figure 9-2. The device can be controlled either through

GPIO pins or through the I2C interface. In Figure 9-2, a Type-C PD controller 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 (UEQ[1:0] and DEQ[1:0]) can be

left unconnected. If these pins are left unconnected, the TUSB1044A 7-bit I2C target address is 12h because

both UEQ1/A1 and UEQ0/A0 are at pin level F. If a different I2C target address is desired, set the UEQ1/A1 and

UEQ0/A0 pins to a level which produces the desired I2C target address.

Recent ECN (Engineering Change Notice) to the USB3.2 specification allows for AC-coupling capacitors

between USB receptacle and the USB3.2 receiver pins of a device, host, or hub. The TUSB1044A does

support the additional AC capacitor as depicted in Figure 9-2 on pins DRX2P/N and DRX1P/N. Make sure the

AC-coupling capacitor is no smaller than 297nF. A value of 330nF is recommended.

TUSB1044A

SLLSG07 – MARCH 2025

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