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2 P 40 Heat — Parallax Forums

2 P 40 Heat

ArchiverArchiver Posts: 46,084
edited 2003-05-29 06:38 in General Discussion
Hello Stampers,

I am using the 2 P 40 in my latest project. What I want to know is, if it
may get a little warm while working. I am using 20 input pins, each pulled
down via 10K and connected via 22K to a 12V-signal. That makes about 3.5V at
each input.

Is that OK and is it normal that the 2 P 40 gets a little warm?

Thanks for help,

Uli


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

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2003-05-28 15:09
    In a message dated 5/28/2003 12:56:57 AM Pacific Daylight Time,
    ulibasic@r... writes:

    > Is that OK and is it normal that the 2 P 40 gets a little warm?
    >
    > Thanks for help,
    >
    > Uli

    have not used the 2 P 40 before but.....if you can keep your finger on it for
    and extended period of time, you are likely ok....if it burns your finger,
    likely something is amuck.


    [noparse][[/noparse]Non-text portions of this message have been removed]
  • ArchiverArchiver Posts: 46,084
    edited 2003-05-28 16:25
    I don't know if it's normal or not but the BS2P40 that I have heats up some
    while in operation, so I suppose a certain degree of heat is normal.
    Original Message
    From: "ulibasic" <ulibasic@r...>
    To: <basicstamps@yahoogroups.com>
    Sent: Wednesday, May 28, 2003 3:49 PM
    Subject: [noparse][[/noparse]basicstamps] 2 P 40 Heat


    > Hello Stampers,
    >
    > I am using the 2 P 40 in my latest project. What I want to know is, if it
    > may get a little warm while working. I am using 20 input pins, each pulled
    > down via 10K and connected via 22K to a 12V-signal. That makes about 3.5V
    at
    > each input.
    >
    > Is that OK and is it normal that the 2 P 40 gets a little warm?
    >
    > Thanks for help,
    >
    > Uli
    >
    >
    > [noparse][[/noparse]Non-text portions of this message have been removed]
    >
    >
    > 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.
    >
    >
    > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2003-05-28 18:12
    I assume your input signal is +12 or 0.
    I assume you are doing input only, as you
    certainly can't DRIVE a 12-volt signal.

    Is your 12-volt signal referenced to the same
    ground as your stamp?

    For input only, the stamp shouldn't be pulling
    any kind of current from its input pins, which
    would be the source of heat -- on input, the
    pins look like a high-impedance.

    What are your other pins driving? That could
    be the source of heat.

    The big possiblity is that your Stamp ground
    and your signal ground are not connected, and
    you may have more than the 3.5 volts at each
    input pin than you think. If it's over 5V,
    this would not be good.

    --- In basicstamps@yahoogroups.com, "ulibasic" <ulibasic@r...> wrote:
    > Hello Stampers,
    >
    > I am using the 2 P 40 in my latest project. What I want to know is,
    if it
    > may get a little warm while working. I am using 20 input pins, each
    pulled
    > down via 10K and connected via 22K to a 12V-signal. That makes
    about 3.5V at
    > each input.
    >
    > Is that OK and is it normal that the 2 P 40 gets a little warm?
    >
    > Thanks for help,
    >
    > Uli
    >
    >
    > [noparse][[/noparse]Non-text portions of this message have been removed]
  • ArchiverArchiver Posts: 46,084
    edited 2003-05-29 06:38
    Hello,

    I have a BS2p24 and my program had a loop where I was waiting for input. I
    replaced a pause 100 with nap 3 in the loop and it cooled down the stamp by
    about 5 degrees celsius! Using nap my stamp is usually only 2 degrees C
    above ambient. But I am not sourcing or sinking a lot of current either.

    If your application and devices can tolerate the wake up I/O interruption
    from nap it might cool your stamp down a bit.

    Chuck Chargin Jr.

    At 09:49 AM 5/28/2003 +0200, you wrote:
    >Hello Stampers,
    >
    >I am using the 2 P 40 in my latest project. What I want to know is, if it
    >may get a little warm while working. I am using 20 input pins, each pulled
    >down via 10K and connected via 22K to a 12V-signal. That makes about 3.5V at
    >each input.
    >
    >Is that OK and is it normal that the 2 P 40 gets a little warm?
    >
    >Thanks for help,
    >
    >Uli
    >
    >
    >[noparse][[/noparse]Non-text portions of this message have been removed]
    >
    >
    >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.
    >
    >
    >Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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