TUSB542 is an active re-driver for USB 3.1 Gen1 applications; it supports Type-C applications, as well as switching between two Hosts and one device (or vice versa). The device is a dual channel USB 3.1 Gen1 (5Gbps) re-driver supporting systems with USB Type-C connectors. The TUSB542 can be controlled through the SEL, and is best controlled using an external Configuration Channel Logic or Power Delivery Controller to properly mux the signals in Type-C applications.

When 5Gbps Super Speed USB signals travel across a PCB or cable, signal integrity degrades due to loss and inter-symbol interference. The TUSB542 recovers incoming data by applying equalization that compensates for channel loss, and drives out signals with a high differential voltage. This extends the possible channel length, and enables systems to pass USB 3.1 compliance.

The TUSB542 advanced state machine makes it transparent to hosts and devices. After power up, the TUSB542 periodically performs receiver detection on the TX pair. If it detects a SS USB receiver, the RX termination is enabled, and the TUSB542 is ready to re-drive.

The TUSB542 operates over the industrial temperature range of –40°C to 85°C in the 2 mm x 2.4 mm X2QFN package. The device ultra-low power architecture operates at a 1.8V power supply. The automatic LFPS DeEmphasis control further enables the system to be USB 3.0 compliant. An advanced state machine inside the device monitors the USB SS traffic to perform enhanced power management to operate in no-connect, U2, U3 and active modes.

The USB Type-C connector is designed to allow insertion either upside-up or downside-up. The TUSB542 supports this feature by routing the AP signals to one of two output channels. The SEL input control defines the way that the AP side signals is routed on the re-driver device side. Table 6-1 lists the active MUX configurations based on the SEL input.

The TUSB542 has flexible configurations to optimize the device using GPIO control pins. Figure 6-1 shows a typical signal chain for mobile applications. Channel 1 is between Application Processor (AP) and TUSB542, Channel 2 is between the TUSB542 redriver and the downstream device. The CNFG_A1 and CNFG_B1 pins provide signal integrity configuration settings for channel 1, while CNFG_A2 and CNFG_B2 pins control the operation of Channel 2 as listed in Table 6-2.

Figure 6-1 Typical Channels

The receiver (RX) of the device provides the flexibility of 0, 3, 6 and 9dB of equalization, while the transmitter (TX) provides the options of 0, 3.5 or 6dB de-emphasis. The transmitter also supports output swing settings of 900 mV and 1.1V.