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Problems with a 24xx128 chip — Parallax Forums

Problems with a 24xx128 chip

ArayaSysArayaSys Posts: 3
edited 2005-06-28 15:09 in BASIC Stamp
We are having problems with the Stamp2SX chip. We have used a 24lc128 I/P from MicroChip which is recommended on parallax's site. We are getting an "EEProm Verify Failure" when downloading to the Stamp, and it only runs for about 10 seconds. By removing pins 2,3,4 and 7 on the EEprom results in a proper download of a 95% full program and 10 - 20 min runtime. Looking on Parallax's site, the parts list for the SX OEM kit lists a 24wc128 P from Catalyst. It is the same for the most part, but pins A0-A3 are listed as NC. Anyone with similar troubles or ideas on this matter your help would be greatly appreciated. idea.gif

Comments

  • ForrestForrest Posts: 1,341
    edited 2005-06-24 03:18
    Are you using a BS2SX OEM board, or some other board? Are you using the 24LC128 to store PBasic programs or as additional storage?
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-06-24 03:38
    Hello,

    ·· On the BS2sx OEM Module, pins 1 through 4 on the EEPROM are connected to ground, as is pin 7.· Pin 8 is connected to Vdd and pins 5 and 6 are the data and clock lines, respectively.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • ArayaSysArayaSys Posts: 3
    edited 2005-06-28 05:04
    Hello again Chris, We have tried the power from a BoE to no avail. We can measure a good clean 5V output and We can also ID the Sx chip from the Editor software. We are wondering if having the circuit built on a BreadBoard would make a diffrence. We have shortened all of the leads to minimize the interference and have kept the surronding EM fields low (no monitors ,stereos etc.). What exactly does the "EEprom Verify Failure" mean and how is it generated by the Sx chip. We always get this error when downloading but are unsure of how the Sx chip decideds to generate this error. If we remove the EEprom chip we recive a "No stamps found" message and when we remove the communitation lines we recive "Hardware Communication Error". We can send you a picture of our circuit if you think it would help.
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-06-28 15:09
    Hello,

    ·· Please send the picture to the e-mail address listed below and I will see if anything stands out.· But as per our phone conversation much of what is happening defies logic.· By letting the GND and Address lines of the EEPROM float, the device shouldn't work at all.· But you seem to be able to make the circuit work by doing that.· That is very strange indeed.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
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