KevinGreenBMX

Member Since: February 25, 2017

Country: United States

  • Am I correct in assuming that since the guide has the GPIO’s and PWR_EN directly hooked up to switches and buttons to 3.3v/Ground that the RN-52 has internal pull-ups/pull-downs? Edit I realized my question was poorly framed, I know the datasheet says that it has programmable pull-ups and pull-downs, my question is meant to confirm that they are active by default as used in the hookup guide.

  • Am I correct in assuming that since the guide has the GPIO’s and PWR_EN directly hooked up to switches and buttons that the RN-52 has internal pull-ups/pull-downs?

  • good point, Thanks

  • Copied from product page comments:

    M-Short (SparkFun) said: “You should only have one power supply on the VCC/3.3V line at any given time. I would see about cutting the trace on the back of the FTDI. There is a solder jumper that that lets you select 3.3V or 5V. It is basically 3 pads with VCC in the center and 3.3V on one side and 5V on the other. Usually you connect one of the sides to the center. If you just isolate the center though you should end up with no power on VCC. Note: I haven’t checked the schematic to double check this will work so proceed with some caution. If you still have questions feel free to email techsupport@sparkfun.com”

    KevinGreenBMX said: “Thank you for confirming what I suspected! I looked at the schematic for the FTDI, and it looks like clipping that trace would leave the FTDI’s VCCIO pin floating, which I imagine would cause some problems. I think what I will need to do instead is just desolder/clip the power pin of the header (JP1, Pin 3). This will leave the FTDI unable to power other projects, but that is ok. Thanks for your help!

  • Thank you for confirming what I suspected!

    I looked at the schematic for the FTDI, and it looks like clipping that trace would leave the FTDI’s VCCIO pin floating, which I imagine would cause some problems.

    I think what I will need to do instead is just desolder/clip the power pin of the header (JP1, Pin 3). This will leave the FTDI unable to power other projects, but that is ok.

    Thanks for your help!

  • I am using one of these in a project to control one of the RN-52 Bluetooth audio modules (sparkfun breakout). The project has it’s own 3.3v power supply for the Arduino and the RN-52, which leads me to my question:

    Is it safe for me to allow the project power supply 3.3v regulator to provide 3.3v to VCC with a 3.3v SparkFun FTDI Basic Breakout hooked up to the programming header? I noticed the first time I hooked up the FTDI with the power supply off that it fed 3.3v through and lit up the “on” LED on the project power supply.

    I considered placing a diode on the VCC connection that feeds the Arduino when on project power, but at 3.3v I really don’t want the forward voltage drop, and I have worries about overpowering something like a 1N6263 schottky diode.

  • I am using one of these in a project to control one of the RN-52 Bluetooth audio modules (w/ sparkfun breakout). The project has it’s own 3.3v power supply for the Arduino and the RN-52, which leads me to my question:

    Is it safe for me to allow the project power supply 3.3v regulator to provide 3.3v to VCC with a 3.3v SparkFun FTDI Basic Breakout hooked up to the programming header? I noticed the first time I hooked up the FTDI with the power supply off that it fed 3.3v through and lit up the “on” LED on the project power supply.

    I considered placing a diode on the VCC connection that feeds the Arduino when on project power, but at 3.3v I really don’t want the foward voltage drop, and I have worries about overpowering something like a 1N6263 schottky diode.

No public wish lists :(