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Maximum parameters drawing from the board directly and placement of Vm pin — Parallax Forums

Maximum parameters drawing from the board directly and placement of Vm pin

WaldoDTDWaldoDTD Posts: 142
edited 2009-03-15 15:45 in General Discussion
Hello,
Need to know what is the maximum amp load/voltage load the Javelin can maintain. I have accidentally blown out a stamp in the past and do not wish to do so again. Also where is the Vm pin location (i am not using the javelin demo board but a BOE as a development board).

Comments

  • WaldoDTDWaldoDTD Posts: 142
    edited 2009-03-14 23:04
    Also if I tied the ground lead of a battery pack to the ground on the board would this do anything to the board? Would it create a common ground?
  • Peter VerkaikPeter Verkaik Posts: 3,956
    edited 2009-03-15 15:45
    The javelin can take 6-24VDC at its VIN pin.
    The javelin has an onboard regulator that can supply 150mA/5V.
    The module uses 60mA for its internal circuitry.
    That leaves 90mA for circuitry connected to the javelin VDD pin
    and·current sourced by the the·Javelin I/O pins.

    Here is the BOE schematic:
    http://www.parallax.com/Portals/0/Downloads/docs/prod/boards/BOE_USB_D_Schematic.pdf
    The Vm appears·to be called VSV0.

    Here is the manual:
    http://www.parallax.com/Portals/0/Downloads/docs/prod/boards/28850-BOE-USB-v1.4.pdf
    You set the voltage to the servo connecters via the jumper located between the
    servo connectors.

    All grounds should be connected. Just make sure that if you input a voltage > 5V to
    a Javelin I/O pin, that you have a series resistor >= 1k that will limit any current
    through the I/O pins protection diodes.

    regards peter
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