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Prop Current. — Parallax Forums

Prop Current.

mctriviamctrivia Posts: 3,772
edited 2009-03-11 20:57 in Propeller 1
The data sheet says:

500uA/MIP does this mean if running on low frequency internal osilator(20kHz) that the draw is only 2.5uA?

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Need to make your prop design easier or secure? Get a PropMod has crystal, eeprom, and programing header in a 40 pin dip 0.7" pitch module with uSD reader, and RTC options.

Comments

  • Cluso99Cluso99 Posts: 18,069
    edited 2009-03-08 08:19
    Not sure how much it will draw at 20KHz, but certainly it will be much much lower. Also it uses power to supply power to the output pins.

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  • virtuPICvirtuPIC Posts: 193
    edited 2009-03-08 08:32
    In the very low frequency range the relation usually is no more linear. There will be some constant overlay. I have seen graphics of current consumption in some data sheet showing this for the prop.

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  • dMajodMajo Posts: 855
    edited 2009-03-09 20:27
    mctrivia said...
    The data sheet says:

    500uA/MIP does this mean if running on low frequency internal osilator(20kHz) that the draw is only 2.5uA?

    Where you have seen this information?

    Lastime when I was answering Hippy on your secure module tread I look pretty all electrical caracteristics and graphs but I do not remember this
  • mctriviamctrivia Posts: 3,772
    edited 2009-03-09 20:33
    it is near the beginning of the data sheet I can get the page number when I get home.

    strange thing is it lists it at 70f si unit is c and have not seen a data sheet use f

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    Need to make your prop design easier or secure? Get a PropMod has crystal, eeprom, and programing header in a 40 pin dip 0.7" pitch module with uSD reader, and RTC options.
  • dMajodMajo Posts: 855
    edited 2009-03-09 20:48
    Please (I have also not seen any temp info in °F: all are in °C)

    I am referring to datasheet V1.1
  • mctriviamctrivia Posts: 3,772
    edited 2009-03-09 20:51
    not sure what version number I have at home. should be able to check in about 3 to 4 hours when I get home

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    Need to make your prop design easier or secure? Get a PropMod has crystal, eeprom, and programing header in a 40 pin dip 0.7" pitch module with uSD reader, and RTC options.
  • mctriviamctrivia Posts: 3,772
    edited 2009-03-09 23:58
    page 16 of version 1.01

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    Need to make your prop design easier or secure? Get a PropMod has crystal, eeprom, and programing header in a 40 pin dip 0.7" pitch module with uSD reader, and RTC options.
  • dMajodMajo Posts: 855
    edited 2009-03-10 08:33
    I have no access to 1.01 datasheet (Parallax doesn't have it on download page).

    I had given a look also on page 17 because in 1.1 there is a chapter more (4.8) that takes a page. After that I make a search for the number "500" and only 3 cases exists in the datasheet: two of them are related to crystal and PLL (ohm and kHz) and the last one is related to uA but this is the max forward current through internal protection diodes (here I am explaining to DavidM how to take care on this)

    Anyway I think you should refer to chapters 8 (electrical characteristics) and 9 (current consumption characteristics): maybe·it (your data) was an errata if Parallax·has removed from newer datasheet.
  • Michael O'BrienMichael O'Brien Posts: 55
    edited 2009-03-10 12:28
    Guys,
    ·· To help you out, here are older 1.0 and 0.2 versions of the Propeller datasheet I have come across at the Parallax site.

    Parallax Propeller Multi-core Controller Data Sheet - Rev 1.1 9/12/2008
    http://www.parallax.com/Portals/0/Downloads/docs/prod/prop/PropellerDatasheet-v1.1.pdf

    Parallax Propeller Multi-core Controller Data Sheet - Rev 1.0 11/14/2007.
    http://www.parallax.com/Portals/0/Downloads/docs/prod/prop/PropellerDatasheet-v1.0.pdf

    Parallax Propeller Multi-core Controller Data Sheet - Rev 0.2 4/2/2007 - for historical reference.
    http://forums.parallax.com/attachment.php?attachmentid=46365

    ··· thank you
    ··· /michael
  • mctriviamctrivia Posts: 3,772
    edited 2009-03-10 13:08
    1.1 there is under 40 pages. the 1.01 have has over 400 pages fle name WebPM-v1.01.pdf

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    Need to make your prop design easier or secure? Get a PropMod has crystal, eeprom, and programing header in a 40 pin dip 0.7" pitch module with uSD reader, and RTC options.
  • dMajodMajo Posts: 855
    edited 2009-03-10 20:25
    Yea, this is the Propeller manual (a bit old: they still refer to PropTool V1.0) not the datasheet

    Datasheet states for 160mips (8cogs@80MHz) a current draw between 3mA and 80/85mA depending on which kind of code is executed (basically how often times the hub is accessed). The manual is good to learn programming. Take the datasheet, it have many more technical informations
  • Paul BakerPaul Baker Posts: 6,351
    edited 2009-03-11 20:57
    The number you quote only applies to higher ranges of operation where the power consumption is linear. The average leakage of the Propeller is 3-4 uA, and the operation of the internal RC circuit consumes current, so while the power consumption will be low, it will be higher than what is estimated by that formula. Take a look at the Figure in 9.1 of the datasheet to see where the linear and non-linear current consumption regions are with respect to operating frequency and type of operation.

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    Paul Baker
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