Ok. Here's another random thought.
What if I use, say, a Linear LT1300 Step-up 3.3V DC/DC converter (almost
exactly the same one the palm uses to regulate the 2 AAA cells to make its
3.3 V supply, I think) and connect it to the VCC pin in the hotsync port?
Might this work?
i.e. keeps 3.3 V output for me to use even if I start drawing current from
the pin and input to the regulator sags a bit. The LT1300 produces 3.3 V
output even with as low as 1.8 V input , corresponding to 5 mA drawn from
VCC. Take into account efficiency (80% or so, says the data sheet) and I'd
still be safe.
Only problem I can perhaps envision is the regulator not being speedy
enough to handle an input sag when parts of my circuit jump into activity
at various times. Anyone used an LT1300 or equivalent?
I probably missed something colossally obvious again...
Kris
At 11:15 AM 5/11/00, you wrote:
>Another possibility would be a rechargeable coin cell. I haven't dealt with
>them in quite a while, but from what I recall you could get a 3.3 V Li-ion
>cell about the size of a fat quarter that you could trickle charge. As long
>as you are adding more energy than you are using this scheme will work.
>
>Good luck and let us know what your final solution is.
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