A typical usage of the TUSB1044 device is shown in Figure 7-2. The device can be controlled either through its GPIO pins or through its I²C interface. In Figure 7-2, 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 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 7-2 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.

Figure 7-2 Typical Application Circuit