c...@isbd.net wrote: > John Syn <john3...@gmail.com> wrote: > > >"Steady state max. voltage at all I/O pins" > > >"-0.5 volts to IO supply voltage +0.3 volts" > > > > > >So, even with power off, some voltage *is* allowed and in fact it > > >should be fairly easy to keep the voltage within these limits using > > >Schottky diodes for clamping. > > Schottky diodes aren¹t going to clamp the voltage to this range. Simply > > use the 3V3 output from the BBB to enable the supply to your board. > > > ??? > > How would using the 3.3v IO output from the BBB be any different from > clamping the input voltages to the 3.3v IO output from the BBB? It's > the same thing surely? > > One Schottky diode prevents the voltage going below 0.3 volts (it will > conduct such that the voltage doesn't go below 0.2 volts), another can
That should say -0.3 volts of course. > clamp the input to prevent it going above the 1.8 volt ADC supply > voltage. > -- Chris Green · -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
