On Fri, 27 Nov 2009, Eric H. Johnson wrote: > Date: Fri, 27 Nov 2009 11:23:41 -0500 > From: Eric H. Johnson <ejohn...@camalytics.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "'Enhanced Machine Controller (EMC)'" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Hostmot2 disabling download of FPGA configuration > > Sebastian, > > I will have to check for sure on Monday, but I am pretty sure it is 5V 10mA > for the first relay. I do not know off hand the specific turn on and turn > off current or the rising and falling threshold voltages, except that it is > TTL compatible. > > Regards, > Eric >
I'm not Sebastian but I do have an idea. If the relay is driven from a 5I20 FPGA pin, and the relay is referenced to +5V (+ input to +5V, - input to 5I20 output) it may be that its never completely turned off since the 5I20 outputs only swing to 3.3V in the high state when in the default push-pull mode, leaving 1.7 V of drive when its supposed to be off. If this is the case, the solution is to set the 5I20 pin that drives the relay (and in fact any outputs that drive 5V referred loads) to OPEN-DRAIN mode, which will allow the output to swing all the way to 5V, fully turning off the load. > > The relay that's connected to the gpio output, what voltage & current > does it need to turn on? What does it need to turn off? > > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day > trial. Simplify your report design, integration and deployment - and focus on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
