Congrats to Varun, Pierre, and Tak: the FC carrier board works!

- I can talk serial to the TQM5200 and watch it boot.
- I can see that it correctly identifies the 4 GB flash drive.

.. and so far, that's it. Still to test: USB and CAN. There were issues,

- I screwed up soldering the LTM4629 micromodules. Should have baked the
solder in the vias-in-pads first. But Screaming Circuits fixed the
micromodules LGA for free (thanks guys!), and now they work.

- The MAX5902 in the front end was overcurrent triggering for no real
reason; turns out their spec for DRAIN in was terribly off. So I removed
a resistor from the drain path to the MOSFET, and now it works.

- The octal buffer for the LEDs had an active low input, but was tied high.

So, now on to making an official breakout board so we can test USB.


Andrew Greenberg

Portland State Aerospace Society (  P: 503.788.1343  C: 503.708.7711

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