On 21.10.17 20:47, Nicklas Karlsson wrote:
> > 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.
If you use a little RS485 Tx/Rx chip at each end, then that'll absorb 7v
of ground offset without further ado. The DS3695A is a bit current
hungry, and is only half duplex. More suitable would be something like:
SN65LBC180P Full duplex 5 mA, 30 nS pulse width, No Enables, 8-pin
(=> good to 10 Mb/s)
Balanced transmission between modules reduces EMI, and increases EMI
tolerance. Termination is 120 ohms - dead simple to use.
Erik
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