![]() ![]() I encourage you to try this simple upgrade, as you won’t be disappointed. Combining high speed CMOS and monolithic air core transformer technology, this isolation component provides outstanding performance characteristics and is easily integrated with low and full. The PCB can be easily made using a laser printer and an iron. USB peripheral isolation Isolated USB hub GENERAL DESCRIPTION The ADuM31601 is a USB port isolator based on Analog Devices, Inc., iCoupler technology. The PCB artwork in 1:1 scale pdf file and component placement is available for download HERE. I recommend using the build in regulator. JP3 allows you to switch between the power supplies of the second half of the isolator. It is the designer’s choice how to use this functionality. In other applications, it can be connected to a GPIO pin of a controller, a fixed delay circuit can be applied, or it can be connected as shown in this circuit. In this application, the PIN input is jumpered high so that the upstream pull-up is applied as soon as peripheral power is applied. This function is controlled by the PIN input. The ADuM4160 has an option to delay application of the upstream pull-up under control of the peripheral. JP1 switches the speed – open=low speed(1.5Mbps), close=full speed(12Mbps). Full stop.The circuit is pretty straightforward but here is some explanation. I tell my colleagues that I will stand by the fire extinguisher while they probe the device under test, but I don't do mouth-to-mouth. Stuff happens, no matter how careful you try to be. The +5V (VDD Host), ground (Host Gnd), and the two signal lines are routed to the USB Isolation IC (U1) and to the isolated DC-to-DC converter (U2). The PC side USB connector is a Type B (P1). If the isolator is built into a peripheral device, it can receive power directly from the power supply of the peripheral. Power to run Side 2 of the ADuM4165/AD-uM4166 cannot come from the downstream USB cable as it did on Side 1 from the upstream USB cable. We never start testing without a supply of extra fuses on hand. Refer to schematic in Section Appendix A, Circuit Schematic. the USB Type A connector on the EVAL-ADuM4165EBZ and the EVAL-ADuM4166EBZ. It still requires care, and this kind of development is not recommended for the inexperienced and/or faint-hearted designer. I also use an isolation transformer for such a module while it is under development so that I can connect a (non-isolated, safety-grounded) 'scope in such a way as to minimize endangerment of life and limb (and of the 'scope). SiliconLabs isolation products create a CMOS barrier to protect components while still allowingfor communication and power transfer. ![]() (These modules are not Arduino-based but that doesn't affect the isolation considerations with which we are concerned.) The Isolated USB EXP is intended to help demonstrateand evaluate applications for Silicon Labs isolation, interface, and MCU products. After development, the (wireless) modules are self-contained with no external connections other than UL-approved plugs to the mains and to the monitored appliance. The primary challenges in developing a USB isolator are properly determining the direction of data transmission and when to disable drivers to allow an idle bus state. I have used them for development of power metering modules that get power directly from the AC mains and are connected in-line between the mains and a load, and, therefore, simply must be isolated from PC grounds (for functional reasons as well as for human and device safety). GC-202 can completely isolate the electrical and ground circuit of USB devices at both ends, avoid the damage of the ground circuit voltage, surge, induced. If you are dealing with serial port data rates (115,200 kb/s or so), it's easy and reliable and inexpensive to convert RS-232-to-TTL levels (and back) with to separate the grounds? Low-tech opto-isolators on plain serial lines ![]()
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