[DSP-10] Pin P3/20 problem

[Duncan Smith]

Is it possible internal pullups were changed between Silicon Rev 2.0 and 
Rev 4.0?

There are no differences in Errata:

http://www.analog.com/technology/dsp/EZAnswers/anomalies/81ANOM.html

I have two ADDS-21XX-EZLITE P/N# 35-000286-01.
I  believe I ordered both direct from AD:

         The first was ordered in November 1999.
         It has no serial number.  It has an 8.5x11 inch EZ-KIT Reference 
Manual.
         The processor is Rev 4.0 with date code 9923.

         The second was ordered in late 2000, or 2001 as I recall.
         It has a serial numbered label over an old non-SN label.
         It has SN: 510314.  It has a smaller, perfect bound Reference Manual.
         The processor is Rev 2.0 with date code 9635.

It appears the later kits are using earlier processors.

Perhaps someone knows the differences between Rev 2.0 and Rev 4.0.

Is your processor 2.0 or 4.0, or perhaps something else?

d

At 02:04 PM 4/2/02 -0500, DC9UPGermany@aol.com wrote:
>Hi Jonathon....
>Thanks for your reply to my question last week...about the  Pin P3/20 problem.
>
>I have been searching again on the diagramm of the EZ-Kit and on the board
>itself.
>Its for shure somekind of electrostatic problem...its not a "pressure", or
>bad solder joint problem. The same thing happend to a second
>EZ Board from Walter...but not as strong as over here.
>
>Firstoff things here are running quite well, since I put this 10 k resistor
>from Pin 20 P3 to GND......
>
>Now I took a close look again...Pin 20 of P3 is directly connected to Pin 125
>at the ADSP 2181, called IAL and its left open..
>No pullup or pulldown resistor is connected to it, so far I can see !!!!
>
>As soon as my fingers get close to the top of the ADSP 2181, Pin 125 is
>cetching some electrostatic charge. No pressure is
>needed to do this. Furtheron I have to mention that the air over here is
>very, very dry which is allways a good source for static electricity.
>Very often I can feel this.!!! hi
>
>In the meantime I checked all the pullup resistors (R5, R21 etc.).....they
>are ok....in order to there Voltage...(5Volts).
>
>So, wy did they (AD) left IAL (Pin 125) open ??? Good question ??
>
>Answers wellcome...
>best 73 de hermann
>
>
>
>
>
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