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key ring? — Parallax Forums

key ring?

Lithium_fun!Lithium_fun! Posts: 18
edited 2007-09-11 01:40 in General Discussion
I ordered the SX kit pro and I also got something called a keyring. What is this and what is it for? (I couldn't find a product page or anything...)

Comments

  • BenoitBenoit Posts: 47
    edited 2007-09-10 23:44
    The keyring is used to program the SX when your project does not run at 5 volts, I believe

    http://www.parallax.com/detail.asp?product_id=45211

    From the store page:
    The SX KeyRing is a small board (which resembles the SX-Key® programming tool in size and shape) that connects between the SX-Key or SX-Blitz and the SX chip to allow low-voltage programming and debugging.

    -Benoit
  • Lithium_fun!Lithium_fun! Posts: 18
    edited 2007-09-11 00:02
    Thanks!
    ·
  • RobotWorkshopRobotWorkshop Posts: 2,307
    edited 2007-09-11 01:40
    The SX-Key needs to run at 5V. If your target SX processor is running at 3.3v then you need to put the Key-Ring inline with the SX-Key. The ground and OSC lines pass through. The Power to the SX-Key then comes from the Key-Ring instead of the target processor like it normally does....

    Robert
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