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Support #3523

assemble + test SFP experimentation board with LVDS transceivers onboard

Added by laforge 3 months ago. Updated 3 months ago.

Status:
Resolved
Priority:
Normal
Assignee:
Target version:
-
Start date:
06/05/2018
Due date:
06/05/2018
% Done:

70%


Description

Following the design of #3314, let's assemble and test the first board to verify the design.

P4511119.JPG View P4511119.JPG 189 KB mschramm, 09/11/2018 02:52 PM
P4511125.JPG View P4511125.JPG 41.8 KB mschramm, 09/11/2018 04:36 PM
P4511127.JPG View P4511127.JPG 80.9 KB mschramm, 09/11/2018 04:36 PM
3334
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Related issues

Follows Misc Hardware Projects - Feature #3314: design simple SFP experimentation board with LVDS transceiverResolved2018-06-042018-06-04

History

#1 Updated by laforge 3 months ago

  • Due date set to 06/05/2018
  • Start date changed from 09/05/2018 to 06/05/2018
  • Follows Feature #3314: design simple SFP experimentation board with LVDS transceiver added

#2 Updated by roh 3 months ago

  • Status changed from New to In Progress

it seems i missed that we do not have the lvds transmitters yet yesterday.
so IC1 is still missing, the rest is placed.

#3 Updated by laforge 3 months ago

On Wed, Sep 05, 2018 at 04:02:45PM +0000, roh [REDMINE] wrote:

it seems i missed that we do not have the lvds transmitters yet yesterday.

So you're trying to tell me that I forgot to order them?

#4 Updated by mschramm 3 months ago

The SN65LVDS1DBVR are missing for whatever reason.

#5 Updated by tnt 3 months ago

SN65LVDS1DBVR is out of stock at farnell until october. But the SN65LVDS1DBVT is available.

#6 Updated by laforge 3 months ago

On Fri, Sep 07, 2018 at 06:03:46PM +0000, mschramm [REDMINE] wrote:

The SN65LVDS1DBVR are missing for whatever reason.

will order them from digikey.

#7 Updated by mschramm 3 months ago

SN65LVDS1DBVR have arrived.

#8 Updated by mschramm 3 months ago

3334

all parts placed, tests have started...

#9 Updated by roh 3 months ago

  • Status changed from In Progress to Resolved
  • Assignee changed from roh to mschramm
  • % Done changed from 0 to 70

ic placed.

board tested.

2 important details:

there was a need to place a bias resistor from RD_N to ground (pin4 on ic2) or the whole board would not work. ic2 has internal 100ohm prom pin3 to pin4 and pullups of ~300k to vcc. 100k pulldown on one leg pushes it into the proper operating range. due to the 100ohm its not neccessary to have more than one pulldown.

the other one is adding arrows on the silkscreen like on the sfp breakout (pointing IN next to IC1, and OUT next to ic2)

#10 Updated by mschramm 3 months ago

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(more pictures, explaining roh's and tnt's addition)

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