The USB design separates information and energy for safer, sooner, and cleaner connections from factories to hospitals. See extra!
The CN0590 is a galvanic isolation reference design for USB 2.0 high-speed Kind-C connectors from Analog Units (ADI). It gives a totally remoted connection between a USB 2.0 host and a USB 2.0 system, providing sign and energy isolation as much as 2.5 W and supporting information charges as much as 480 Mbps as per the USB 2.0 normal. The design meets 2.5 kV rms isolation voltage per UL 1577, with a creepage and clearance (C&C) distance of three.1 mm, and complies with IEC 61010, IEC 62368, and IEC 60601 necessities for industrial, instrumentation, power, and medical functions.
Information isolation is carried out utilizing the ADuM3166, and energy isolation is achieved by the ADuM3070 driver with an exterior transformer. The ADuM3070 delivers regulated remoted energy of 5 V at as much as 2.5 W with larger stability and effectivity than unregulated converters, working as much as 105°C. The isoPower circuitry generates remoted energy for the secondary facet, whereas the first facet is powered instantly from the USB Kind-C enter cable — requiring no exterior provide. Based on USB 2.0 high-power specs, ports should provide 4.75 V to five.25 V and at the least 500 mA, which the ADuM3070 meets.
An extra USB Kind-C receptacle on the secondary facet of the isolation barrier permits powering exterior masses requiring greater than 2.5 W. Two MAX14606 units handle twin energy sources, prioritizing the exterior provide when accessible and offering reverse polarity, overvoltage, and overcurrent safety.
Galvanic isolation in USB connections is essential for breaking floor loops, enhancing resistance to common-mode transients, and guaranteeing noise immunity, decreasing sign integrity issues. It’s also required for security compliance below requirements like IEC 62368-1 (IT and A/V merchandise), IEC 61010-1 (measurement and management gear), and IEC 60601-1 (medical units). These forestall hearth hazards and shield customers from high-voltage faults. In medical programs, isolation ensures affected person security when connecting non-certified IT gear to patient-connected units reminiscent of imaging or surgical programs, or when utilizing utilized elements like USB 2.0 cameras.
In industrial settings, isolation prevents electromagnetic interference (EMI) from equipment reminiscent of motor drives or welding gear, decreasing the chance of system malfunction and defending operators and gear from high-voltage faults. It may possibly additionally enhance signal-to-noise ratio (SNR) in high-end audio functions.
USB is a regular from the USB Implementers Discussion board and is likely one of the most generally used point-to-point serial interfaces, usually changing RS-232 in industrial debugging and firmware upgrades. It helps easy, hot-swappable connections and energy supply. The USB 2.0 protocol is half-duplex and helps three speeds: 1.5 Mbps (low pace), 12 Mbps (full pace), and 480 Mbps (excessive pace).
ADI has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) format, and extra. The corporate’s web site has extra information concerning the reference design. To learn extra about this reference design, click on right here.
