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Reading from a LTC1288 ADC — Parallax Forums

Reading from a LTC1288 ADC

sunblocksunblock Posts: 55
edited 2012-10-26 00:19 in Propeller 1
I hesistate to ask, but has anyone tried to read voltages from a LTC1288 (3v version of 1298) using the propeller? I see there are plenty of references about Basic STAMP an the 1298, but can't find much if any on the 1288 and propeller. Am I missing something? I am trying to see if there are any known gotchas or anything I should look out for.

Comments

  • Beau SchwabeBeau Schwabe Posts: 6,566
    edited 2012-10-25 11:42
    Looking at both of the data sheets, the same code that works for the MCP3202 should also work for the LTC1288. If not let me know.

    BTW) Welcome to the Parallax forum !!!
  • Beau SchwabeBeau Schwabe Posts: 6,566
    edited 2012-10-25 12:16
    I found some old code I had for the MCP3202 and I just happened to have an LTC1288 in front of me.

    My assumption was right in that the same code works for both the LTC1288 and the MCP3202. Attached is some DEMO code. Enjoy!!
    zip
    zip
    MCP3202.zip
    342K
  • sunblocksunblock Posts: 55
    edited 2012-10-25 13:39
    That is awesome, I've never had anyone write/supply code to me, it's always been the other way around! Thanks so much!
  • sunblocksunblock Posts: 55
    edited 2012-10-25 15:35
    I was able to locate an article in nuts and volts about the ltc1298, including a wiring diagram. Albeit for basic stamp. My concern is less of a concern, a question, is that I dont see a bypass/decoupler in the schematic there. And all ive read lately is how important that is. is the cap providing that function in the wiring diagram? And if so, why wouldnt it connect the vcc and ground pins directly, pin-to-pin essentially, as ive been reading? Hope that made sense and that the answer is much less lengthy.
  • frank freedmanfrank freedman Posts: 1,983
    edited 2012-10-25 21:41
    Use bulk cap say 33ufd tantalum on busses supplying power to the analog part of your design with a .1u ceramic or such (I have oodles of .1u in a two pin dip footprint I scrounged somewhere years ago) on each chip from source to ground. Further good design reading can be had from chip makers. Also check out EEtimes and EDN bloggers for some great stuff.
  • sunblocksunblock Posts: 55
    edited 2012-10-26 00:19
    This stuff is AWESOME! If I never have to write another device driver or operating system chunk-o-code I'll be in heaven. Starting to feel like a mad scientist. Thanks for the help!!!!!
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