Zero Ohm resistor on 3.3V output

doggiedoc

I am working on a new Propeller board schematic and learning along the way. I am using examples from the Quickstart Board for the voltage regulator part of the circuit.

I am trying to understand it as a go. I am not sure what the purpose of the resistor R16 in this clipping from the QuickStart schematic.

Can someone educate me?
Thanks!
Paul

Tubular

Those same pads likely had a 0.1 ohm resistor at some stage to measure current. Once all the design is complete, and you don't need to measure any more, just fill it with 0 ohm resistors for production.

BTW I once had a 0 ohm resistor... that was actually open circuit. It made my day. I kept it somewhere...

Mike Green

It's not really acting as a resistor. I believe the "LP" stands for "low power" and 3.3V_LP provides power for those portions of the Quickstart board that need to function in a low power mode, perhaps running off a "back-up" battery. In that case, you'd remove the R16 jumper and perhaps substitute a Shottky diode so you could remove power to the USB interface, Vin, and 3.3V areas leaving just the Propeller chip and EEPROM with power.

doggiedoc

Thanks! No need for it then. I'll just leave it out.