Joey Gold Posted July 27, 2017 Share Posted July 27, 2017 Hi , Does the DD support 5V logic ? , the datasheet details are a little unclear to me. Regs Joe Link to comment Share on other sites More sharing options...
Bianca Posted July 27, 2017 Share Posted July 27, 2017 Hi @Joey Gold, It is 5V compatible, which means that you can see 5V signals. You won't be able to output from the Discovery 5V signal because the source is not capable of any of that. Best regards, Bianca Link to comment Share on other sites More sharing options...
Joey Gold Posted July 29, 2017 Author Share Posted July 29, 2017 Can you share in the documentation it says the inputs are 5V I/O tolerant ? Link to comment Share on other sites More sharing options...
attila Posted August 2, 2017 Share Posted August 2, 2017 Hi @Joey Gold You can find the DD reference manual on the following page:https://reference.digilentinc.com/reference/instrumentation/digital-discovery/reference-manual Link to comment Share on other sites More sharing options...
kastein Posted April 3, 2018 Share Posted April 3, 2018 Hi, I found this thread while looking into using my Digital Discovery w/ 5V logic... (surprise!) To answer the question in a little more detail and ask another question. The DIN_USR_0...23 inputs are definitely 5V tolerant by virtue of having a 51k input series resistor (in parallel with a compensation capacitor) followed by a Schottky ESD/overvoltage diode to 3.3V. That's only 33uA current (approx) through the resistor+diode @ 5V input. The diodes are rated at 30mA, so (ignoring any diode forward voltage drop...) you could jam an awful lot of voltage into those inputs without causing damage. The DIO_USR_24...31 I/O channels, however, I'm not so sure. The SN74CBT3384C 10ch FET bus switch is 5V tolerant, but between the input protection PTC, FET Ron, and 10 ohm resistor I only see 46 ohms, and then it appears the DIO_FPGA_24 signal is fed directly into the FPGA I/O pins. Any idea on whether these 16 I/O will tolerate 5V? I haven't explored the software well enough yet to know if they can actually be used as inputs, TBH, but the name says DIO, so I'm assuming it's possible. Link to comment Share on other sites More sharing options...
attila Posted April 4, 2018 Share Posted April 4, 2018 Hi @kastein The Digital Discovery DIO lines are also 5V tolerant. The translators limit the current sink above 3.3V and the PTC/diodes are for protection above 5V, recommended maximum.https://reference.digilentinc.com/reference/instrumentation/digital-discovery/reference-manual#io_level_translators Link to comment Share on other sites More sharing options...
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Joey Gold
Hi ,
Does the DD support 5V logic ? , the datasheet details are a little unclear to me.
Regs
Joe
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