PickNick Posted June 28, 2014 Report Share Posted June 28, 2014 Hi all! i bought a nice Raystar LCD modul for my minimalSID synth. http://www.tme.eu/en/Document/8edbea480ac602455d604e39dfe07a51/RC2002A-BIG-ESV.pdf ///Interface Pin Function at page 6 can i use this with a PIC based core if the LCD Vdd is 3.3V and the pin 16 is NC/not connected? Quote Link to comment Share on other sites More sharing options...
Shuriken Posted June 29, 2014 Report Share Posted June 29, 2014 Not by default no as the PIC Core operates on 5V. You will need to build a level conversion circuit with for example a 74HCT541. Quote Link to comment Share on other sites More sharing options...
Hawkeye Posted June 29, 2014 Report Share Posted June 29, 2014 (edited) Yes! If you don´t want to use an IC, and have a few resistors lying around, that might work, too: As the data lines on the LCD end are only receiving data, you don´t need bi-directional level shifting and also as no high currents flow, it is possible to also build that with voltage dividers (two resistors per data line). You can get 3.3V supply voltage for the display by using a LDO voltage regulator (fed by 5V, outputting 3.3V). Many greets! Peter PS: Great avatar, PickNick! Good old times! :-) Edited June 29, 2014 by Hawkeye Quote Link to comment Share on other sites More sharing options...
PickNick Posted June 29, 2014 Author Report Share Posted June 29, 2014 thanks! i have a few 3.3V regulator...of course:) ...but i still don't know what about the pin16 on the LCD which is NC on the datasheet... cheers! Peter Quote Link to comment Share on other sites More sharing options...
Hawkeye Posted June 29, 2014 Report Share Posted June 29, 2014 (edited) Looking at the datasheet, i´d say no need to connect pins 15 and 16. These are normally the supply pins for the display backlight. I think this special model has an inverter or something like that onboard, especially as pin 15 is described as "negative voltage output". The worst thing that can happen when you don´t connect the pins, is that you have no backlight (but should see characters). The worst thing that can happen, if you connect them (especially as pin 15 is described as negative voltage output) is the release of some awesome amount of magic smoke! ;-) Many greets, Peter Edited June 29, 2014 by Hawkeye Quote Link to comment Share on other sites More sharing options...
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