SC75823 13-Segment LCD Display

SC75823 is an LCD controller IC that is able to drive up to 156 segments. It is a 5V device that gets display data via serial bus. I found it in an auto CD player's front panel with 8 x 13 segment character LCD. I couldn't find an Arduino compatible library for it so I wrote one.

The controller only supports writing data to it. There is no key input support like other front panel ICs that can control a display and read pressed keys. The panel I'm using had each key connected in series with a different resistor and the main processor read pressed key by analog read value. Since some keys didn't work anymore, I cut the PCB and removed extra parts, keeping only the LCD panel, its backlight and the controller.

The communication protocol is probably Sanyo CCB (computer control bus), somewhat similar to SPI (it uses clock, data and chip enable signals). The controller has a pin INH that when LOW turns off the display. The library supports turning display off via this pin if connected or using software command.

Read more »