17:16 <nemanjan00[m]> Glasgow can not be used for IO above 5V, even with external voltage ref?

17:16 <nemanjan00[m]> I need UART that works above 6V

17:27 <whitequark[cis]> it cannot

17:27 <whitequark[cis]> the absolute maximum is 5.5V

17:28 <whitequark[cis]> this is a fundamental engineering restriction, it was either making it fast and versatile at lower IO voltages, or having the capacity for higher IO voltages

17:28 <whitequark[cis]> the former seemed a lot more valuable in general, so that's what we did

17:28 <whitequark[cis]> electronic_eel was working on a high voltage enablement addon board, but I'm not sure what the status of that is

17:33 <electronic_eel> i did some testing and prototyping for the high voltage board, but it is still very much more an idea than a finished design

17:33 <electronic_eel> but it would only limit the inputs to safe voltages, it wouldn't be able to push out more than 5v

17:34 <electronic_eel> and a "uart above 6v" sounds like it should also be able to send with more than 5v

17:34 <electronic_eel> the idea behind my board was mostly to use glasgow as designed with 5v, but protect it against accidental voltages up to about 30v

17:40 <whitequark[cis]> ah right

17:41 <electronic_eel> nemanjan00[m]: so depending on the actual voltages you are planning to use, i would suggest using something like a small prototype board using for example CD4504B voltage level translators. they are rated for up to 20v

17:41 <nemanjan00[m]> Huge thanks to both of you

17:42 <electronic_eel> downside with this is of course that you must commit to input and output pins, you can't change that on the fly like with the native pins of the glasgow

17:46 <jn> the uart above 6V, does it happen to follow standard RS232 signalling?

17:51 <nemanjan00[m]> I have no idea, I am attempting to figure that out. I am attempting to talk to a device that I do not have a cable for and accourding to what I found online, it requires 7.5V+

17:51 <nemanjan00[m]> And it has RX and TX pins combined in one

17:52 <nemanjan00[m]> Bottom left one

17:53 <nemanjan00[m]> Vin is used for level shifting

17:53 <nemanjan00[m]> Source: http://www.cqham.ru/uniprog2_eng.html

17:54 <whitequark[cis]> use a cheap usb rs232 adapter?

17:54 <whitequark[cis]> most of those don't have a full voltage multiplier and go to only like 10v

17:55 <whitequark[cis]> wait... is that a radio?

17:55 <whitequark[cis]> or an antique mobile phone? I know somebody who is an enthusiast

17:55 <nemanjan00[m]> I did try to use it, but signal seems to be inverted, I did not measure voltage

17:55 <nemanjan00[m]> Motorola Radio (CM140)

17:56 <electronic_eel> the schematics mentions "+6 .. +15V" - this doesn't look like rs232 to me as that would be "+-6V ... +- 15v"

17:56 <nemanjan00[m]> (I am guessing param can probably be set for it not to be inverted, but I am using closed source application inside of wine to talk to it and it barely works)

17:57 <electronic_eel> but it could of course be that the schematics is wrong and they are using rs232

17:57 <nemanjan00[m]> From what I understand, E+ is derived from VIN and it is used for logic shifting for RX and TX

17:58 <nemanjan00[m]> Maybe I am wrong (I am beginner at electronics)

18:42 <gruetzkopf> the motorola radios work with extremely primitive level shifters