So we got the nice, expensive, (now retired) OS4000.
I was wondering if you guys had any tips or tricks to improve on the schematic I've come up with for protection:
if the image doesn't show up in its entirety:
http://search.digikey.com/us/en/product ... -ND/965702
http://parts.digikey.com/1/parts/186750 ... w36-c.html
-F1: a 250mA PTC
-D1: 3.6V Zener Diode, 1W
The RJ45 connector is connected to a 5V TTL level UART off of an ARM board. +5Vin is supplied by the ARM board, but really can't supply much current.
So, does anyone feel like tearing this thing to pieces?
What I'm designing against is the possibility of 24V being applied to any of the pins on the RJ45 connector, in addition to ESD at any of the connectors...