MCU Interface 1

[torque]

Trying to locate a single IC to interface 8 sense lines detecting +11 to +30 Volts DC appearing on them, to 8 inputs on an MCU operating on 3.3 Volts. Immunity to Electrical noise and ESD would be important. Anyone know of a suitable device?, (or am I being over optimistic).
I have a discrete solution, but the component count is prohibitive.

 

[IRstuff]

They make quad opto-isolators, perhaps there are octals as well?

http://clickit.go2net.com/search?ci...pl&rawto=http://www.amppower.de/pdf/66143.pdf

TTFN

 

[torque]

Thanks IRSTUFF, usefull but I was hoping for a more cost effective solution (CHEAP)
Regards
Torque

 

[nbucska]

are the sense lines analog or digital ? (on/off, levels ? )

<nbucska@pcperipherals.com>

 

[Heydave]

You might look into some RS232 interface devices with series input resistors to limit input current. You could use some form of emitter follower to buffer your inputs from voltage dividers that reduce the voltage to something easier to handle. You can get multiple transistors in IC packages.