Searching \ for 'Leaching PIC power from RS-232' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page:
Search entire site for: 'Leaching PIC power from RS-232'.

Truncated match.
PICList Thread
'Leaching PIC power from RS-232'
2000\03\31@230651 by John A. Craft

<x-flowed>I've seen it done with pre-packaged products, but how can I leach enough
power from RS-232 to power a F876?

Thanks in advance

John Craft

John A. Craft                                   (228)689-8100 Voice
Lead Analyst                                    (228)689-8130 Fax
Diamond Data Systems of MS, Inc.      
MSAAP Bldg 9110                       
Stennis Space Center, MS  39529


2000\03\31@231732 by David VanHorn

Hash: SHA1

At 10:02 PM 3/31/00 -0600, John A. Craft wrote:
>I've seen it done with pre-packaged products, but how can I leach enough
>power from RS-232 to power a F876?

In a production design?

Look up the 232 spec, and find the minimum load spec. This will tell you
how much current each connected driver must be able to source. Also, note
that the drivers only have to develop 3V into this load.

Use the highest impedance for your receivers you can, and pocket the
change. :)
In real life, they will do better than spec, but that's all the energy you
can count on.
It's a lot like phone line powered devices, you can only count on 20mA, and
no particular voltage at all.

This is a good excersize for those who skimp on their 232 interfaces to run
through, as it helps illustrate that the "other guy" may need some of that
margin too :)
Version: PGPfreeware 6.5.2 for non-commercial use <>


'Leaching PIC power from RS-232'
2000\04\04@152507 by jamesnewton
face picon face

James Newton 1-619-652-0593 NEW! FINALLY A REAL NAME!
Members can add private/public comments/pages ($0 TANSTAAFL web hosting)

{Original Message removed}

More... (looser matching)
- Last day of these posts
- In 2000 , 2001 only
- Today
- New search...