Hi!
(Noob question below )
I have an older BBB rev.0 board, currently powered by the USB FTDI cable. At the FTDI cable pins, I read 5V. On the other side of the board, however, at the +5V/GND pins, I read ~3.57V. Is this drop expected?
(I should note also that I opted for a 7805a voltage regulator when constructing this board, years ago.)
The real issue that leads me to this question is that I'm trying to drive a chip that requires 4.75 to 11V supply voltage. So it seems that the voltage drop across the BBB results in a V that is outside of that range.
Thanks!
BBB (rev.0) Voltage drop
Re: BBB (rev.0) Voltage drop
LimesPone,
The problem is the 7805, that voltage drop is about right for that device. Grab a more modern LDO such as a LM2940 or LM9931 (5v model) and put it in and you'll be fine. However you need to carefully check the inputs and outputs with a meter and compare to the pinout of the device you are putting in, to get it installed correctly.
Hope that helps,
Paul
The problem is the 7805, that voltage drop is about right for that device. Grab a more modern LDO such as a LM2940 or LM9931 (5v model) and put it in and you'll be fine. However you need to carefully check the inputs and outputs with a meter and compare to the pinout of the device you are putting in, to get it installed correctly.
Hope that helps,
Paul
BBB rev 0 Voltage drop
I see what youre saying... but now that poses another question... Those are incoming power, so what voltage are you feeding it?
Re: BBB (rev.0) Voltage drop
I need a few more details to understand the question.
Paul
Paul