I will use 3.3V from P8/P9. So it is safe to use this circuit then. Also i will not use HDMI pins.
Thanks for help :) 2019 m. sausis 9 d., trečiadienis 19:21:05 UTC+2, Charles Steinkuehler rašė: > > On 1/9/2019 11:13 AM, Gediminas Dirma wrote: > > Hello > > > > I am trying to design input scheme for beaglebone that i will use with > > machinekit. I add picture of scheme that i intend to use. But i am a bit > > scared that during booting input from 3.3V rail could damage board. I > think > > i read somewhere that you can only input voltage to pin than beagle has > > booted. So can i use this scheme or should i change it? > > Assuming the pull-up resistor uses the 3.3V supply available on the > P8/P9 headers you should be fine. It is unsafe to apply voltage to > the I/O pins while the BeagleBone is not powered, but there is no > requirement that the BeagleBone has to have "booted". > > The only potential issue you might have is if you use any of the HDMI > I/O pins. These pins cannot be driven while the BeagleBone is in > reset, as they are sampled at the rising edge of the reset signal and > used to determine the boot mode (ie: if you change the pin state > before the BeagleBone comes out of reset you may select an unsupported > boot mode by accident). > > This is discussed in the Technical Reference Manual for the various > BeagleBones: > > https://beagleboard.org/Support/Hardware+Support > > -- > Charles Steinkuehler > [email protected] <javascript:> > -- website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit --- You received this message because you are subscribed to the Google Groups "Machinekit" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. Visit this group at https://groups.google.com/group/machinekit. For more options, visit https://groups.google.com/d/optout.
