On 1/1/13 12:16 PM, Poul-Henning Kamp wrote:
--------
In message <[email protected]>, Bob Camp writes:
I'm not bashing the Arm parts, [...] They worry about every uA of
current drain
True story:
Many years ago when the very first ARM silicon arrived and they started
testing it, it was generally execeeding expectations but a little bit
flakey at high clock rates.
After the bubbly had been drunk and hangovers subdued, the serious testing
started and one of the first thing they found was that they had forgotten
to hook up VCC: The chip ran entirely on leaked power from the I/O pins,
most notably the #RESET pin.
When they also connected the VCC pin, it was stable well above spec'ed
speed.
more than one person (including me) has found out that with boards
powered from their I/O interfaces rather than the power supply that they
forgot to turn on.
It's a huge deal in the spacecraft world because of the desire to do
cross strapped redundancy with cold spares. Is the interface truly
"dead faced"? And if you have a pyro actuated cable cutter, what
happens if power from one wire couples into an interface for an
unpowered unit?
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