26 Dec
2016
26 Dec
'16
6 p.m.
Hey, I am planning a custom project utilizing the EOMA68 standard and I was wondering about VREFTTL.
What I have read so far (elinux.org) is that VREFTTL refers to the maximum voltage that can be applied to the GPIOs. My questions are though: Is VREFTTL always 3.3V or can it be lower? What should I do, if some ICs require a certain supply voltage and VREFTTL does not meet the requirements? Would it be necessary do level shifting in advance (to be compatible with other voltages)? How much current can I draw out of the computing card?
Thank you, Julius Lehmann