26-12-2020, 05:21 PM
(This post was last modified: 26-12-2020, 05:22 PM by ppppenguin.)
I've juggled digital designs with different permutations of 5V and 3.3V devices on various occasions. I've also had to deal with the annoying SAA1043 which needed 5.7V minimum to meet spec. Also interfacing 4000 series CMOS at assorted voltages to TTL. There are always solutions, the art is finding something simple and workable.
For your design I was looking at ideas for running only the display at 5V while keeping everything else at 3.3V. Hence my ideas above. I don't think it can work with the display running between +3.3V and -1.7V as logic LO would be nowhere near adequate.
There is lots of stuff online about 5V<>3V3 interface problems and solutions. Just google "interfacing 5v to 3.3v logic".
There are LCD displays that will run on 3V3 such as : https://www.sparkfun.com/products/9052 I'm not very familiar with different types of displays so have no idea about how they are driven etc. Also OLED displays: https://uk.farnell.com/c/optoelectronics...ltage=3.3v
For your design I was looking at ideas for running only the display at 5V while keeping everything else at 3.3V. Hence my ideas above. I don't think it can work with the display running between +3.3V and -1.7V as logic LO would be nowhere near adequate.
There is lots of stuff online about 5V<>3V3 interface problems and solutions. Just google "interfacing 5v to 3.3v logic".
There are LCD displays that will run on 3V3 such as : https://www.sparkfun.com/products/9052 I'm not very familiar with different types of displays so have no idea about how they are driven etc. Also OLED displays: https://uk.farnell.com/c/optoelectronics...ltage=3.3v
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv