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Vdd Vss on the Prop.chip — Parallax Forums

Vdd Vss on the Prop.chip

OlovAOlovA Posts: 23
edited 2009-02-17 18:43 in Propeller 1
Hi. I'm making a pcb for the prop. Do i have to connect all of the Vdd and Vss to the chip or ?

There is 4xVdd and 4xVss, Internally connected ?

Thank's / Olov

Comments

  • Erik FriesenErik Friesen Posts: 1,071
    edited 2009-02-17 12:34
    Yes, it is necessary. You don't want much current flowing through the chips internal ground connections.
  • CannibalRoboticsCannibalRobotics Posts: 535
    edited 2009-02-17 14:24
    Yes and pay attention to the bypass caps. They need to be as close to the prop as you can get. Where possible they should be "in-between" the connection and the prop pin so the power flows from the source, by the cap then to the pin.
    Good Luck!

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  • OlovAOlovA Posts: 23
    edited 2009-02-17 15:23
    Okay, tnx for the answers. One more question, this board will "take care of" a steppermotor. To minimize rfi, should i use ferrite bead's on all of the connections to and from the stepper electronics or how to do ?
  • LeonLeon Posts: 7,620
    edited 2009-02-17 16:59
    Ferrite beads probably won't help. Pay attention to the supplies and grounding.

    Leon

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  • CannibalRoboticsCannibalRobotics Posts: 535
    edited 2009-02-17 18:43
    What is the nature of the stepper electronics? The biggest issue is co-mingling power supplies between the CPU and motors.

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