current capacity of bs2p40
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For the bs2p40, the manual states that "the total per 8-pin group (P0-
P7, P8-P15, X0-X7, OR X8-X15) should not exceed 100ma (source or
sink) if using an external 5-volt regulator."
Does that mean that each of the 4 8-pin groups can handle 100ma EACH,
meaning the stamp can handle a total of 400ma on all 32 pins?
P7, P8-P15, X0-X7, OR X8-X15) should not exceed 100ma (source or
sink) if using an external 5-volt regulator."
Does that mean that each of the 4 8-pin groups can handle 100ma EACH,
meaning the stamp can handle a total of 400ma on all 32 pins?
Comments
>For the bs2p40, the manual states that "the total per 8-pin group (P0-
>P7, P8-P15, X0-X7, OR X8-X15) should not exceed 100ma (source or
>sink) if using an external 5-volt regulator."
>
>Does that mean that each of the 4 8-pin groups can handle 100ma EACH,
>meaning the stamp can handle a total of 400ma on all 32 pins?
>
>No, as stated "per 8 pin group". There is a per pin limit (one pin only) and a
group limit as well. Both limits MUST be observed. This is true of all Stamps.
The limits vary from Stamp type to Stamp type.
Regards,
Bruce Bates
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>
>
>
about the total overall capacity of all the pins. I have 24 LEDs
that I need to light up, each LED sucks 10ma. The way I interpret
the statement in the manual is that I cannot have more than a 100ma
draw for each of the 4 groups of 8 pins. So I'd have 80ma draw on P0-
P7, another 80ma draw on P8-P15, and another 80ma draw on X0-X7.
I just don't know if I'm interpreting the manual correctly.
--- In basicstamps@yahoogroups.com, Bruce Bates <bvbates@u...> wrote:
> At 03:15 PM 2/25/04 +0000, andy_watson5 wrote:
> >For the bs2p40, the manual states that "the total per 8-pin group
(P0-
> >P7, P8-P15, X0-X7, OR X8-X15) should not exceed 100ma (source or
> >sink) if using an external 5-volt regulator."
> >
> >Does that mean that each of the 4 8-pin groups can handle 100ma
EACH,
> >meaning the stamp can handle a total of 400ma on all 32 pins?
> >
> >No, as stated "per 8 pin group". There is a per pin limit (one pin
only) and a group limit as well. Both limits MUST be observed. This
is true of all Stamps.
> The limits vary from Stamp type to Stamp type.
>
> Regards,
>
> Bruce Bates
>
>
>
> >To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> >from the same email address that you subscribed. Text in the
Subject and Body of the message will be ignored.
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
mA but the chip gets very very hot. And, not an the Stamps best day is
it ever going to sink or source 240 mA. You can either change to
low-current (2 mA) LEDS or use buffers to handle the your current
requirements.
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: andy_watson5 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=_J47KCzH8kalPDn34EfaZ9L73vUDm48tL721vnjWXheBWBpEKhD5ZhiXtpbAl93Mxh4VCcGSVC3CeBTB]andywatson@m...[/url
Sent: Wednesday, February 25, 2004 10:06 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: current capacity of bs2p40
Yes, I know that each pin can source of sink 30ma. My question is
about the total overall capacity of all the pins. I have 24 LEDs
that I need to light up, each LED sucks 10ma. The way I interpret
the statement in the manual is that I cannot have more than a 100ma
draw for each of the 4 groups of 8 pins. So I'd have 80ma draw on P0-
P7, another 80ma draw on P8-P15, and another 80ma draw on X0-X7.
I just don't know if I'm interpreting the manual correctly.
--- In basicstamps@yahoogroups.com, Bruce Bates <bvbates@u...> wrote:
> At 03:15 PM 2/25/04 +0000, andy_watson5 wrote:
> >For the bs2p40, the manual states that "the total per 8-pin group
(P0-
> >P7, P8-P15, X0-X7, OR X8-X15) should not exceed 100ma (source or
> >sink) if using an external 5-volt regulator."
> >
> >Does that mean that each of the 4 8-pin groups can handle 100ma
EACH,
> >meaning the stamp can handle a total of 400ma on all 32 pins?
> >
> >No, as stated "per 8 pin group". There is a per pin limit (one pin
only) and a group limit as well. Both limits MUST be observed. This
is true of all Stamps.
> The limits vary from Stamp type to Stamp type.
>
> Regards,
>
> Bruce Bates
or relays to power the LED's, but I'm working on a quick prototype
for testing, so I was hoping I could just run the LED's from the
stamp, but it looks like I'll have to try something else. Thanks.
--- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
wrote:
> Our recommendation is 60 mA MAX for all pins; we've pushed it up to
80
> mA but the chip gets very very hot. And, not an the Stamps best
day is
> it ever going to sink or source 240 mA. You can either change to
> low-current (2 mA) LEDS or use buffers to handle the your current
> requirements.
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Dallas Office
>
>
>
Original Message
> From: andy_watson5 [noparse][[/noparse]mailto:andywatson@m...]
> Sent: Wednesday, February 25, 2004 10:06 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Re: current capacity of bs2p40
>
>
> Yes, I know that each pin can source of sink 30ma. My question is
> about the total overall capacity of all the pins. I have 24 LEDs
> that I need to light up, each LED sucks 10ma. The way I interpret
> the statement in the manual is that I cannot have more than a 100ma
> draw for each of the 4 groups of 8 pins. So I'd have 80ma draw on
P0-
> P7, another 80ma draw on P8-P15, and another 80ma draw on X0-X7.
>
> I just don't know if I'm interpreting the manual correctly.
>
>
> --- In basicstamps@yahoogroups.com, Bruce Bates <bvbates@u...>
wrote:
> > At 03:15 PM 2/25/04 +0000, andy_watson5 wrote:
> > >For the bs2p40, the manual states that "the total per 8-pin group
> (P0-
> > >P7, P8-P15, X0-X7, OR X8-X15) should not exceed 100ma (source or
> > >sink) if using an external 5-volt regulator."
> > >
> > >Does that mean that each of the 4 8-pin groups can handle 100ma
> EACH,
> > >meaning the stamp can handle a total of 400ma on all 32 pins?
> > >
> > >No, as stated "per 8 pin group". There is a per pin limit (one
pin
> only) and a group limit as well. Both limits MUST be observed. This
> is true of all Stamps.
> > The limits vary from Stamp type to Stamp type.
> >
> > Regards,
> >
> > Bruce Bates
you could 'flash' clumps of LED's then 'flash'
the next clump. Making sure that each clump
did not exceed the 60 mA rating.
--- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
wrote:
> Our recommendation is 60 mA MAX for all pins; we've pushed it up to
80
> mA but the chip gets very very hot. And, not an the Stamps best
day is
> it ever going to sink or source 240 mA. You can either change to
> low-current (2 mA) LEDS or use buffers to handle the your current
> requirements.
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Dallas Office
>
>
>
Original Message
> From: andy_watson5 [noparse][[/noparse]mailto:andywatson@m...]
> Sent: Wednesday, February 25, 2004 10:06 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Re: current capacity of bs2p40
>
>
> Yes, I know that each pin can source of sink 30ma. My question is
> about the total overall capacity of all the pins. I have 24 LEDs
> that I need to light up, each LED sucks 10ma. The way I interpret
> the statement in the manual is that I cannot have more than a 100ma
> draw for each of the 4 groups of 8 pins. So I'd have 80ma draw on
P0-
> P7, another 80ma draw on P8-P15, and another 80ma draw on X0-X7.
>
> I just don't know if I'm interpreting the manual correctly.
>
>
> --- In basicstamps@yahoogroups.com, Bruce Bates <bvbates@u...>
wrote:
> > At 03:15 PM 2/25/04 +0000, andy_watson5 wrote:
> > >For the bs2p40, the manual states that "the total per 8-pin group
> (P0-
> > >P7, P8-P15, X0-X7, OR X8-X15) should not exceed 100ma (source or
> > >sink) if using an external 5-volt regulator."
> > >
> > >Does that mean that each of the 4 8-pin groups can handle 100ma
> EACH,
> > >meaning the stamp can handle a total of 400ma on all 32 pins?
> > >
> > >No, as stated "per 8 pin group". There is a per pin limit (one
pin
> only) and a group limit as well. Both limits MUST be observed. This
> is true of all Stamps.
> > The limits vary from Stamp type to Stamp type.
> >
> > Regards,
> >
> > Bruce Bates