Power up sequence

[Konstantin]

Hello all.
I have these SD200 modules I wan tot employ in a router.
Thing is, the modules have this specific power up / power down sequence that must be used.

To power up I must
1. apply 5V logic voltage with the ENABLE pin low
2. apply motor PSU
3. bring ENABLE up


To power down:
1. bring ENABLE low
2. disconnect motor PSU
3. disconnect logic PSU

I have done it manualy while testing and I hope to work an automated way to do so. Maybe with relays. Frankly I am not sure how. Anybody can help out?



Konstantin.

[MrBean]

You could try using a time delay switch. Either build one, I've seen schematics on the web. Or, use one from an industrial control system. I've seen loads on ebay. They can be had in many different time ranges and are adjustable. They usually come to fit din rails.

http://cgi.ebay.co.uk/ws/eBayISAPI.d...sPageName=WDVW
http://cgi.ebay.co.uk/ws/eBayISAPI.d...sPageName=WDVW

Obviously you'll wan't only a short delay.