TUSB1044 datasheet(46/67 Pages) TI1

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TUSB1044

SLLSF47B – FEBRUARY 2018 – REVISED APRIL 2018

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Typical Application (continued)

8.2.1 Design Requirements

For this design example, use the parameters shown in Table 24.

Table 24. Design Parameters

PARAMETER

VALUE

A to B PCB trace length, XAB

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

C to D PCB trace length, XCD

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

E to F PCB trace length, XEF

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

G to H PCB trace length, XGH

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

PCB trace width

4 mils

AC-coupling capacitor (75 nF to 265 nF)

220 nF

VCC supply (3 V to 3.6 V)

3.3 V

I2C Mode or GPIO Mode

I2C Mode.

1.8V or 3.3V I2C Interface

3.3V I2C. Pull-up the I2C_EN pin to 3.3V with a 1K

ohm resistor.

8.2.2 Detailed Design Procedure

A typical usage of the TUSB1044 device is shown in Figure 36. The device can be controlled either through its

GPIO pins or through its I2C interface. In Figure 36, 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 TUSB1044 7-bit I2C slave address is 12h because both

UEQ1/A1 and UEQ0/A0 are at pin level "F". If a different I2C slave address is desired, UEQ1/A1 and UEQ0/A0

pins should be set to a level which produces the desired I2C slave address.

Recent ECN (Engineering Change Notice) to the USB3.1 specification allows for AC-coupling capacitors

between USB receptacle and the USB3.1 receiver pins of a device/host/hub. The TUSB1044 does support the

additional AC-capacitor as depicted in Figure 36 on pins DRX2P/N and DRX1P/N. This AC-coupling capacitor

should be no smaller than 297 nF. A value of 330 nF is recommended.

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