Data & power isolation for critical USB environments

Used with a host controller, a single module counts as two USB hubs for cascaded applications with the level of safety isolation additionally providing effective breaking of ground loops and immunity to EMI in harsh environments. It is also suitable for use in medical environments with the increasing use of USB for low cost sensing and communication where isolation is necessary for safety and noise immunity.

12Mb/s USB speed operation is supported, limited by the data isolation chipset. The module is also able to switch automatically between low (1.5Mb/s) and full (12Mb/s) speed operation, depending upon the application requirements. Full power, 5V/0.5A, meeting the USB bus standard is available from each downstream port and users may power any USB compatible device from the NMUSB module. The ports are short circuit and overload protected. The source power of 5V can be provided by an external adapter or system voltage rail.

The module’s full compliance with the USB 2.0 specification enables hassle free, plug & play operation and its surface mount package for placement on the host motherboard enables the USB isolation function with a single SMT component.

The NMUSB202MC’s reinforced safety isolation barrier meets the requirements of 250VAC systems in IT and medical environments for operator protection, so users may confidently use the product to provide safety isolation in USB connections in critical applications. Safety agency recognition is pending. The device operates over the industrial temperature range from -40 to +85°C.

Manufactured in Murata’s factory using the company’s own techniques and processes, the module is extremely competitively priced, in some instances being significantly less expensive than competitors’ products. USB communication is extremely low cost with many compatible products available. To take advantage of this in harsh environments, users can utilise the function of isolation achieved with Murata’s NMUSB202MC DC/DC module.