How to drive manually HT1621B LCD driver IC?

_q12x_ · 2024-12-20T07:41:14+00:00

Im trying to figure out how to drive (manually-bitbang) a HT1621B LCD driver IC. It is capable of driving multiplexed LCDs. They are very cheap, but only in smd form, which is a bit of a challenge to solder all its tiny 48 pins. See youtu.be/xwRXpbxjLcw - you can skip through the movie since it's a long one. I actually managed to drive them using a special library in arduino, and they work beautifully but...I want manual drive. Why? because I can use only logic ICs like nand gates,multiplexers, FF's, etc 40 and 74 series, and also my favorite very easy to drive 12F508 PIC, and why not even an EEPROM. And I can also add custom characters or shapes or symbols. I read their datasheet a couple of times and STILL, I can not decipher the real way of driving them. I also find 2 AN's (AppNotes) AN2343-Cypress and AN0468e HT162x Application Guidelines -HOLTEK. They helped a little but not completely. Here is a list with all my LCD movies I made so far: Q12 LCD - https://www.youtube.com/playlist?list=PL6NJF1kQFOAI0-AstwH5YHuOHenjLtkbS, including this HT1621B IC. Again, skip through their content since Im showing you what I tried and how high I could reach. Thank you very much.

_q12x_

DIY

Today at 7:41 AM

Im trying to figure out how to drive (manually-bitbang) a HT1621B LCD driver IC. It is capable of driving multiplexed LCDs. They are very cheap, but only in smd form, which is a bit of a challenge to solder all its tiny 48 pins. See youtu.be/xwRXpbxjLcw - you can skip through the movie since it's a long one. I actually managed to drive them using a special library in arduino, and they work beautifully but...I want manual drive. Why? because I can use only logic ICs like nand gates,multiplexers, FF's, etc 40 and 74 series, and also my favorite very easy to drive 12F508 PIC, and why not even an EEPROM. And I can also add custom characters or shapes or symbols.
I read their datasheet a couple of times and STILL, I can not decipher the real way of driving them. I also find 2 AN's (AppNotes) AN2343-Cypress and AN0468e HT162x Application Guidelines -HOLTEK. They helped a little but not completely.
Here is a list with all my LCD movies I made so far: Q12 LCD - https://www.youtube.com/playlist?list=PL6NJF1kQFOAI0-AstwH5YHuOHenjLtkbS, including this HT1621B IC. Again, skip through their content since Im showing you what I tried and how high I could reach.

Thank you very much.