USB Interface ICs

TUSB2E22

TUSB2E22 - eUSB2 to USB 2.0 Dual Repeater | Texas Instruments

The Texas Instruments TUSB2E22 is a USB-compliant eUSB2-to-USB 2.0 dual repeater that enables implementation of USB 2.0 compliance ports on newer processors using lower voltage processes. It supports both device and host modes (DRD) and handles low-speed (LS), full-speed (FS), and high-speed (HS) signals. The device is available in two package options: a 25-pin DSBGA (2x2 mm) and a 20-pin VQFN-FCRLF (3.5x3.5 mm). An eUSB2 repeater is a signal conditioning IC that bridges the gap between low-voltage eUSB2 interfaces (1.2V signaling) on advanced SoCs and standard USB 2.0 ports (3.3V signaling). It regenerates and reshapes the USB signals to ensure compliance with USB 2.0 specifications, allowing modern processors with reduced I/O voltages to connect to legacy USB peripherals. This repeater sits in the signal chain between the SoC's eUSB2 port and the USB connector, providing level shifting and signal integrity enhancement. Key features include compliance with USB 2.0 and eUSB2 (rev 1.1), support for LS/FS/HS signaling, a dual repeater with 2:2 crossbar mux, host and device mode (DRD) support, and four eUSB2 compensation settings through EQ0 and EQ1 pins. The device also features eUSB2 LS/FS signaling at 1.2V, making it compatible with low-voltage processors. The TUSB2E22 is designed to interface with eUSB2 eDSPr or eUSPr operating at 1.2V single-ended signaling. Technically, the TUSB2E22 uses a repeater architecture that retimes and drives the USB signals, improving signal integrity over longer traces and through connectors. The 2:2 crossbar mux allows flexible routing of the two eUSB2 ports to two USB ports, enabling applications such as USB Type-C receptacle flipping. The four compensation settings allow designers to tune the output drive strength to match different PCB trace lengths and connector losses. Typical applications include USB Type-C ports on laptops and desktops, docking stations, USB hubs, and embedded systems where the SoC uses eUSB2. The device is particularly useful in designs where the processor's I/O voltage is too low for direct USB 2.0 signaling, such as in advanced mobile and computing platforms. When designing with the TUSB2E22, ensure proper power supply decoupling and follow the layout guidelines in the datasheet to minimize signal integrity issues. The EQ0 and EQ1 pins should be configured according to the system's trace length and connector characteristics to optimize signal quality.