Organize and Share your Electronics the way you want. Sign-Up for a free account now. It takes only 30 seconds!

App note: Isolating USB with SPI

App note: Isolating USB with SPI

Old but still good technical note from Analog Devices on USB isolation. Link here (PDF)

Currently, iCoupler® digital isolation technology is capable of transferring data at rates ranging from DC to about 150Mbps, which is adequate for transferring serial data to support low (1.5Mbps) and full (12Mbps) speed modes of USB. There are three places where isolation could be introduced, in the differential transmission lines D+/D–, between the controller and the transceiver, and between the controller and the system controller.  Unfortunately, the trend toward higher levels of integration incorporates the transceiver and controller interfaces into the system controller, leaving only D+/D– data lines available outside of the controller for isolation.
This is an extremely challenging place to try isolation because there is no flow of control signals, and data is a combination of single ended and digital signaling.  With current isolation technology, the most practical place to isolate is between the system controller and a stand-alone USB controller/transceiver where signals can be unidirectional and logic level.  In many cases this means bypassing inboard controllers and adding a discrete USB controller.

Read more Here

 

More Articles to Read

A 3D-printed e-drum pad
A 3D-printed e-drum pad
Interactive geodesic LED dome = extreme geometric fun!
Interactive geodesic LED dome = extreme geometric fun!
Guide to build your 3.3v power supply
Guide to build your 3.3v power supply
SDR radio breathes life into a 75 year old Marconi CR100
SDR radio breathes life into a 75 year old Marconi CR100
A Time for Ranting!
A Time for Ranting!
Emulate a Commodore 64 keyboard with a modern PC and an Arduino
Emulate a Commodore 64 keyboard with a modern PC and an Arduino
USB2005 and USB97C202 Sharing ATA/ATAPI Drive w/ Another Controller
USB2005 and USB97C202 Sharing ATA/ATAPI Drive w/ Another Controller
Robotic Cat Laser
Robotic Cat Laser
LED traffic light
LED traffic light
Estimating Power for ADSP-BF561 Blackfin® Processors
Estimating Power for ADSP-BF561 Blackfin® Processors

Top




Shares