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<sensille>
i'm rapidly running out of ideas what i'm doing wrong with my ecp5 slave spi :( even with diamond i get no reaction. according to boundary scan all pins are connected as expected
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<whitequark>
azonenberg: hey, what do you know about indicator LED failure moes?
<whitequark>
I see something pretty bizarre here, a LED that lights up only if I cool it down to like -20°C
<whitequark>
as it warms up it seems to gradually go dimmer with higher Vf until it can no longer light up from 3.3V; this is a red LED
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<azonenberg>
whitequark: innnteresting
<azonenberg>
i have to ask how did you discover it worked when frozen?
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<whitequark>
azonenberg: intuition
<whitequark>
the LED is on a completely unremarkable $10 devboard
<whitequark>
and i noticed it got kinda... dimmer, maybe? over 20 minutes i worked with it
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<whitequark>
and in general had strange variability in output
<whitequark>
actually, my guess was not about a LED
<whitequark>
this devboard has an nRF24LU1+ chip, it's one of those things you find in wireless keyboard dongles. highly integrated
<whitequark>
i probed the devboard a few times with a multimeter and got really surprising voltages on some nodes, so i was thinking that maybe it has a faulty LDO or something
<whitequark>
so i inverted a can of butane and blasted it
<whitequark>
suddenly, the LED shines bright. i probe it with a scope and it turns out the LDO in the RFIC is fine, it's the LED, somehow
<whitequark>
this was actually pretty obnoxious lol because i thought i had a bug in my code
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<pie_[bnc]>
well...googling "led doesnt work when hot" and variants only yields useless stuff, and I don't know enough about semiconductor tech, now I am also curious.
<whitequark>
it doesn't seem to be obviously mechanical
<whitequark>
poking it doesn't change anything
<whitequark>
could be inside the epoxy
<pie_[bnc]>
why would you get gradual dimming then though
<whitequark>
yeah i dunno either
<pie_[bnc]>
unless it was somehow arcing across a bad connection or the surface area of the connection was varying?
<whitequark>
if your leds are arcing you have bigger problems
<pie_[bnc]>
idk how much voltage you need to arc at miniscule distances
<pie_[bnc]>
theres less stuff in the way but also less charge carriers (disclaimer: no idea what im talking about)