Sink/source question

Archiver

It is my understanding that the stamp--BS2 will sink a tot. of 50ma(?) . if
I have pins totally sinking more than 50 ma; ex. 70ma but all are not in
use all the time......say only sinking 45ma from the pins in use(active)
will this be ok?
Same question for sourcing(don't know the total source capability of BS2?)

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Archiver

According to the documentation it says:

Each [noparse][[/noparse]i/o pin] can sink 25 mA and source 20mA. However, the total of
all pins should not exceed 50mA (sink) and 40mA (source) if using the
internal 5-volt regulator. The total per 8-pin gourp (P0 - P7 or P8 -
P15) should not exceed 50 mA (sink) and 40 mA (source)if using an
external 5-volt regulator.

--- In basicstamps@y..., "JOHN BELL" <johnabell8@h...> wrote:
>
> It is my understanding that the stamp--BS2 will sink a tot. of 50ma
(?) . if
> I have pins totally sinking more than 50 ma; ex. 70ma but all are
not in
> use all the time......say only sinking 45ma from the pins in use
(active)
> will this be ok?
> Same question for sourcing(don't know the total source capability
of BS2?)
>
> _________________________________________________________________
> Choose an Internet access plan right for you -- try MSN!
> http://resourcecenter.msn.com/access/plans/default.asp

Archiver

The maximum current any one pin can sink is 25 ma, and the maximum is a total
of 50 ma.

Therefore you cannont sink 45 mA from one pin.

At any one time you sink a total of 50ma and the maximum from any one pin is
25.

So you can do pin1 10, p2 10, p3, 30

makes sense?


[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

SMARTDIM,

Thanks for your assistance!

My question pertains more to total usage activation. ex.

If all pins were active and the total source were greater than 40 ma then
this would NOT work. However if at a certain period of time certain pins
were not actively sourcing and the tot. ma was less than 40 ma then I would
assume this WOULD work(the pins not active at that particular time are kept
low; if they were high this would bring tot. ma > 40).

Is this reasonable?



>From: smartdim@a...
>Reply-To: basicstamps@yahoogroups.com
>To: basicstamps@yahoogroups.com
>Subject: Re: [noparse][[/noparse]basicstamps] Re: SINK/SOURCE QUESTION
>Date: Fri, 18 Oct 2002 00:28:00 EDT
>
>The maximum current any one pin can sink is 25 ma, and the maximum is a
>total
>of 50 ma.
>
>Therefore you cannont sink 45 mA from one pin.
>
>At any one time you sink a total of 50ma and the maximum from any one pin
>is
>25.
>
>So you can do pin1 10, p2 10, p3, 30
>
>makes sense?
>
>
>[noparse][[/noparse]Non-text portions of this message have been removed]
>
>
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Archiver

Yes, what you wrote will work. I looked t my original response and found an
error however.

Pin 3 cannot sink 30 ma, 25 max

To reiterate......The max source/sink current for any one pin is 20/25 ma.
This is regardless of what you are doing with the rest of the pins. You
cannot have one pin do 40 ma and the rest do 0 ma. The 40 ma on the one pin
will damage that channel.

With a minimum of external compnents you can drive 50 100, 300, 500 ma easily
using the stamps output lines. Perhaps if you give more detail on what you
want to sourse or sink I can make an easy to follow recommendation.

For example for he item you want to sink or source, what is the device and
what voltage does it operate on?


[noparse][[/noparse]Non-text portions of this message have been removed]