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40-pin controller IC identity?

Discussion in 'Electronic Components' started by SparkyGuy, Mar 17, 2007.

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  1. SparkyGuy

    SparkyGuy Guest

    Haven't been able to identify this controller. Don't need replacement; it's
    got custom code, I'm sure. Would be nice to have pin IDs.


    It's from an old Clifford Intelliguard 200 car security system, vintage early

    Anybody happen to have external wiring diagram or schematic for the PCB?

  2. It's a wild guess, but that's an old National Semi logo. I'd check the
    COP8 family, because it's low cost, e.g. COP888CG (comes in a 40 DIP).

  3. Meat Plow

    Meat Plow Guest

    National MM9224.
  4. Lionel

    Lionel Guest

    Looks like a custom mask-programmed micro. It's a Nat-Semi of some
    variety, but I'm not familiar enough with their range of
    microcontrollers to make an intelligent suggestion as to which one. If
    you can find the right 'family' on their website, you should at least
    then be able to identify clocks, power & I/O pins, if that's any help
    to you. You might also try contacting a support person there & see if
    they have any ideas:
  5. Lionel

    Lionel Guest

    Nice work, Meat. Made obsolete in '97, apparently:

    Obsolete Part Alternate Part or Supplier Source Last Time Buy
    Date Distributor
    1. MM9224-VUL
  6. Guest

    Almost certainly not. 9224 is the date code.
  7. I'd guess it to be a COP8 8-bit CMOS microcontroller (mask
    programmed). Clock should be on pins 6 and 7, which it looks to be
    (axial-lead ceramic caps, 1/8W bias resistor and 2-pin resonator in
    the photo). You should see a clock on pin 6.

    /Reset should be on pin 34 (but it looks to be tied to another pin).

    Vcc should be on 8 and GND should be on 33.

    Eg. COP688CL/COP988CL

    Best regards,
    Spehro Pefhany
  8. Ryan Weihl

    Ryan Weihl Guest

    or could this be a SC\MP version of NatSemi. discontinued
    see heavier traces on 20 and 40

  9. krw

    krw Guest

    I thought about SC/MP, but '92 sounded a bit late. The SC/MP was out
    in the late '70s. I wouldn't have thought it survived that long.
  10. Franc Zabkar

    Franc Zabkar Guest

    AFAICT, the date code of Q15 is 9920 and for the relays it is 9807.
    Would it make sense for a manufacturer to use old mask ROMmed stock in
    a new design?

    - Franc Zabkar
  11. Franc Zabkar

    Franc Zabkar Guest

    Identify the other ICs and work backwards.
    AFAICT, the date codes for Q15 and for the relays suggest that it was
    built as late as 9920. Is this confirmed by the date codes on the
    other chips?
    - Franc Zabkar
  12. Franc Zabkar

    Franc Zabkar Guest

    A search of Google Groups suggests that the 16-pin chip may be a
    ULN2003 which would confirm that the uP has 8-bit IO ports. Tracing
    the ULN2003's inputs back to the uP would identify the uP's IO pins.

    - Franc Zabkar
  13. Meat Plow

    Meat Plow Guest

  14. Meat Plow

    Meat Plow Guest

    Be quiet, you've ruined my moment of stardom!.
  15. Something that's mask programmed, you don't want to buy in small quantities.
    Hence so long as the design is still viable, you don't want to change
    things until you absolutely have to (such as running out of that mask
    programmed device, or something else is just no longer available).

  16. Guest

    Yes. Where I work, we have "masked" [actually they are OTP, but they
    are factory-programmed and sold as "masked"] COP micros dating back at
    least five years. We'll still be making those products five or six
    years from now, and those chips were last time buy two years ago. Less
    expense and trouble to do a last time buy for the product's expected
    lifespan than to port everything to a new micro.
  17. Lionel

    Lionel Guest

    Were they still making the SC/MP in '92? The last time I saw an SC/MP
    was in 1980!
  18. CJT

    CJT Guest

    You'll have to wait until 2008 when the picture becomes available.
  19. SparkyGuy

    SparkyGuy Guest

    Identify the other ICs and work backwards.

    The 8-pin says "3-544" and is probably a 73-544 clock gen. The resonator is
    right there between it and the 40 pin'r.
    I've owned since about mid '98. The relays were replaced maybe ~'99. Don't
    think the transistor was replaced, but might be.
  20. Franc Zabkar

    Franc Zabkar Guest

    Could it be a house-numbered serial EEPROM, eg 93Cxx ???

    According to the datasheet for the COP8 ...

    port pin# function
    G4 3 SO (MICROWIRE Serial Data Output)
    G5 4 SK (MICROWIRE Serial Clock)
    G6 5 SI (MICROWIRE Serial Data Input)

    I think the DIP-14 and DIP-16 IO chips should give you a clue as to
    the uC's port layout. I'm betting that one chip drives various
    external relays while the other accepts inputs from sensors.

    - Franc Zabkar
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