Tips on a protection pcb for the OS4000 compass module

Community PCB Design
1

So we got the nice, expensive, (now retired) OS4000.

http://www.sparkfun.com/products/8960

I was wondering if you guys had any tips or tricks to improve on the schematic I’ve come up with for protection:

Schematic.png1022×455 45.5 KB
http://i480.photobucket.com/albums/rr17 … ematic.png

if the image doesn’t show up in its entirety:

http://i480.photobucket.com/albums/rr17 … ematic.png

Misc parts:

-Open-drain buffer:

http://search.digikey.com/us/en/product … -ND/965702

-OKI-78SR

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? :doh:

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…