SBOU260 September   2021 ISOUSB111

 

  1.   Trademarks
  2. 1Introduction
  3. 2Overview
  4. 3Pin Configuration of the ISOUSB111 Full/Low Speed Isolated USB Repeater
  5. 4EVM Setup and Operation
  6. 5EVM Schematics
  7. 6PCB Layout and 3D Diagram
  8. 7Bill of Materials

2 Overview

The ISOUSB111 device is a galvanically-isolated USB 2.0 compliant repeater supporting Low Speed (1.5 Mbps) and Full Speed (12 Mbps) signaling rates. The device supports automatic speed and connection detection, reflection of pull-ups/pull-downs, and link power management allowing drop-in USB hub, host, peripheral and cable isolation. The device also supports automatic role reversal – if after disconnect, if a new connect is detected on the Upstream facing port, then the Upstream and Downstream port definitions are reversed. This device uses a silicon dioxide (SiO2) insulation barrier with a withstand voltage of 5700 VRMS and a working voltage of 1060 VRMS. Used in conjunction with isolated power supplies, the device protects against high voltage, and prevents noise currents from the bus from entering the local ground. The ISOUSB111 device is available for both basic and reinforced isolation (see reinforced and basic isolation options). The ISOUSB111 device supports a wide ambient temperature range of –40°C to +125°C. The device is available in the standard wide body SOIC-16 (DW) package and a smaller SOIC-16 (DWV) package.

The EVM enables a user to evaluate ISOUSB111 device thoroughly before incorporating the device into their design. To facilitate the EVM to be powered from various power sources including regulated power supplies, standard USB 2.0 connector, standard DC adapter, EVM includes a transformer driver (SN6501), a transformer (CMP-0030614-1), and three adjustable output LDOs (TPS76701 and TPS73701). This EVM can be configured to use the provided LDOs to power the 3.3-V power supplies, or bypass these external LDOs and use the internal LDOs to power the 3.3-V power supplies. The EVM can be configured to operate with and without external LDOs and test configurations details of which are provided in the following sections.

The EVM can be used to verify many of ISOUSB111 data sheet parameters like data-rate, current consumption and others. Some of the data sheet specifications require a different test setup configuration than the ISOUSB111DWEVM and hence, they cannot be verified from the EVM as is. The example parameters include maximum data rate, propagation delay, and other timing specifications.