This is a read-only archive of an earlier blog posting. Reasons for the
change are at http://blog.sensicomm.com.
The permanent version of this post - with comments (if any) - is at
HDMI breakout PCB
This is probably only useful to a small
handful of people, but if you're and engineer developing HDMI
products that might include you.
For some work
developing HDMI-compatible FPGA code, I needed to observe the
control signals with a scope. So I built up this little breakout
PCB. The high-speed video TMDS signals are routed directly through
from one connector to the other. I tried to keep them equal length
and as short as possible. Don't have any way to verify impedance
and reflections, but it works ok on one TV with short HDMI
The low speed (CEC, SCL, etc) signals are
brought out to the header in the back in the photo. Jumpers allow
the signals to pass through, or they can be disconnected to test
and modify them.
The PCB is shared on OshPark. See http://oshpark.com/profiles/sensicomm
if you want to use this design. It uses standard HDMI female
connectors, available from DigiKey and many other vendors.
Soldering the fine-pitch surface mount pins on the connectors is a
bit of a challenge. I tried soldering individual pins, but ended up
using the flood it with solder and mop up the excess with
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