On Sunday 21 January 2007 17:30, Olin Lathrop wrote:
> PicDude wrote:
> > Just did, and it only supports 100mA.  My apps generally require about
> > 100-180mA.
>
> That's quite a bit.  Are you trying to program a PIC or run your app too?

The current draw is due to the relatively many LED's on the board, and sensors 
that are directly on the same power rails due to their ratiometric operation.  

I usually let the programmer run the app for a minute or so after 
reprogramming as there is a quick self-test in the code that runs the first 
time, and then displays the firmware version on the LEDs, for verification.

For these apps, I could let the target app use it's own power source, but I'd 
need to remember to unplug the programmer immediately after the programming 
cycle ends.


> The USBProg can theoretically go higher than 100mA with some minor
> modifications.  ...
> ...  but 180mA should be just about possible at
> 5V if R25 is changed to 10ohms and the 8.2V power supply controller
> possibly reprogrammed.

180mA is max calculated power, assuming everthing is on.  I've been testing 
the power consumption over many of these apps (different ones) today and the 
max consumption I've seen so far is 132mA.  And there's nothing I can think 
of with the other apps (that I haven't tested) that would make it consume 
more.  Less actually.


> How many of these do you need?  ...

Two -- one initially to evaluate, then a backup if it becomes part of my 
regular development or production system.

I need to investigate the other handheld one from the Microcontroller Shop 
that Martin pointed me to, as that seems more like what I originally 
envisioned, though the smaller set of supported PICs is less appealing.  I'll 
be back.

Cheers,
-Neil.
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