> > Unfortunately the isolation barrier circuit have an enable propagation > > delay of 8.5µs maximum either to low or high while a 11 byte packet take > > 17.6µs so this delay will use about a third of the bandwidth at 10Mbit/s > > and it will become worse if packets are smaller or speed increased. > > > > > Do you really need isolation across an SPI link? Why not just use a > common ground.
Well as is now but I could change to a driver which actually is cheaper and then I do not have to pay money for isolation. An added bonus is isolation barrier latency will dissappear. I forgot about this, it's really great you remind me !! > You do want isolation between the high voltage motor and the digital > controller. But if you already have this you don't need another layer. Yes, I forgot for some reason I got depressed and didn't thinkg about adding this isolation barrier. > Ethernet is galvanically isolated and runs at 1GHz. Proof that you could > isolate your 10MHz SPI link but do you need to? Sometimes but mostly not. Regards Nicklas Karlsson ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
