Question regarding USB power to the FLiP module ...

Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 21,403
edited December 1 in Propeller 1 Vote Up0Vote Down
From the FLiP document:

"When connected via a USB port, the Propeller FLiP module will request 500 mA of 5-volt power from a computer or hub or 1,500 mA from a USB charger. If the request is granted, the module will use the power from the USB port, to power both the 3.3 V supply and the USB 5V▷ output.
If the request is denied, the Propeller FLiP module will light the yellow Fault LED, to indicate that it is unable to draw power from the USB port. The module will still be able to communicate and accept a program over a computer or hub’s USB port, but it will require external power at the ▷5-9V input to operate."

What happens if the request to a USB charger is just ignored, i.e. when the charger is a simple 5V supply, and/or the cable contains only the two power conductors?

Thanks,
-Phil
“Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away. -Antoine de Saint-Exupery

Comments

  • 3 Comments sorted by Date Added Votes
  • If there are only two wires, you get the yellow fault. However, if the two data wires in the USB cable are shorted together, FLIP believes it is a charger and you are good to go.
  • Thanks, Tracy!

    -Phil
    “Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away. -Antoine de Saint-Exupery
  • This is my test rig. The bananas plug into the lab supply, and feed the choice of mini or micro USB. The data wires are normally shorted but can be undone for a test like this.
    288 x 240 - 23K
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