This doesn't answers my question. So to describe it more clear: - board/CPU is powered and running - SYS_RESETn is HIGH - GPIO is configured as input ...so all preconditions mentioned in BBB manual are met.
Now when I want to set a HIGH signal to that GPI, can I connect it with BBBs 3.3V directly or is a resistor needed in order to keep this 8 mA sink limit? Am Mittwoch, 30. Juli 2014 12:52:08 UTC+2 schrieb PLyttle: > > BeagleBone Black System Reference Manual Rev C page 113| (in bright red > font): > > "There are several precautions that need to me taken when working with the > expansion > headers to prevent damage to the board. > 1) Do not apply any voltages to any I/O pins when the board is not powered > on. > 2) Do not drive any external signals into the I/O pins until after the > VDD_3V3B rail is up. > 3) Do not apply any voltages that are generated from external sources. > 4) If voltages are generated from the VDD_5V signal, those supplies must > not become > active until after the VDD_3V3B rail is up. > 5) If you are applying signals from other boards into the expansion > headers, make sure > you power the board up after you power up the BeagleBone Black or make the > connections after power is applied on both boards. > Powering the processor via its I/O pins can cause damage to the processor." > > Those kind of assumptions might kill your board. > > LP > > On Wednesday, July 30, 2014 12:38:31 PM UTC+2, [email protected] wrote: >> >> >> Am Dienstag, 29. Juli 2014 20:52:22 UTC+2 schrieb Brandon I: >>> >>> sink 8mA >>> >>>> >>>> >> So setting a GPI to HIGH just by connecting it to 3.3V directly would be >> a problem? I assumed GPIO-inputs are always high-resistance!? >> >> -- 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
