Jean Tourrilhes said:
> Ultra is much more power efficient. In fact, if we could do
> Ultra at 115 kb/s, we could save even more power...
Ultra uses a single data rate so that you do not need
to go through the lengthy negotiation to agree upon
what data rate to use. It chooses 9.6 Kbps as this
single data rate so that the majority of micro-
controllers can handle it. I think introducing a
115.2 Kbps Ultra is counterproductive.
Actually, 115.2 Kbps needs more power than 9.6 Kbps.
In both speeds, you only need to turn on the IR for
1.6 usec to transmit a bit of 0. Thus the energy per
bit is the same. Higher data rate needs to dispense
the same amount of energy at a higher rate, and thus
needs higher power.
Lichen Wang
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