Re: Re: R6k and Ethernet current
Steve Trigero <seecwriter-/[email protected]>
| Newsgroups | gmane.comp.hardware.rabbit-semiconductor |
|---|---|
| Message-ID | <[email protected]> |
We pretty much copied the Ethernet connections that are on the RCM6xxx Interface Board that comes with the RCM6700 Dev Kit. There is no pull-down on the Link line in their design. Unless I'm missing something, all the Link signal does is drive the green LED, so I'm not sure how a pull-down will help my situation. What value pull-down did you use? Steve >________________________________ > From: mario_wtbbh <mario_wtbbh-/[email protected]> >To: [email protected] >Sent: Wednesday, October 3, 2012 7:45 PM >Subject: [rabbit-semi] Re: R6k and Ethernet current > > > >I'll grab an ethernet variant later today and will check. (Ours is permanently connected to a camera via an Ethernet x-over cable, so always has a connection). > >Long shot: Did you include the pulldown on Pin-7 (Lnk) "Needs ext pulldown on RCM5700/5750/6700/6750"? > >Regards, >Mario > >--- In [email protected], "seecwriter" <seecwriter@...> wrote: >> >> For the RCM67XX module, we've noticed an anomaly with current draw >> when using Ethernet. >> >> When the Ethernet port is connected to a LAN, the total current draw >> for the computer section (motherboard + RCM67XX) is a steady 350ma. >> However, if the Ethernet port is not connected, the current fluctuates >> between 350ma and 500ma. We've traced the increase in current to the >> call of pd_havelink() that occurs at about a 500ms rate. That 150ma of >> extra current seems like a huge increase just to check for a LAN >> connection. This pulsing current is affecting our ADC and DAC readings >> and settings. >> >> This occurs on all of our modules. Anyone else notice this and/or have >> any ideas on what to do about it? Adding extra bypass caps hasn't >> helped. >> >> Steve >> > > > > >