This PMOD interfaces a HD44780-compatible 5V character LCD module via two PMOD connectors. This design connects all 8 data signal lines, and allows to run the LCD in both 4-bit and 8-bit mode. The build-in level converter boosts the 3.3V PMOD power and signal levels to 5V. Its physical size matches LCD modules types such as the Sunlike HUOB-XA-G-G. The additional 7x2 socket can interface with LCD displays using the 7x2 dual-row connector type. The resistor RV1 controls the contrast.
| Version | Gerber | Schema |
|---|---|---|
| 1.0 | 20221207-pmod-charlcd-gerber.zip | 20221207-pmod-charlcd-schema.pdf |
| J21 | Label | Description | PMOD1A | J22 | Label | Description | PMOD1B |
|---|---|---|---|---|---|---|---|
| 1 | d[7] | LCD Data-7 | 4 | 1 | en | LCD EN Signal | 43 |
| 2 | d[5] | LCD Data-5 | 2 | 2 | rs | LCD RS Signal | 38 |
| 3 | d[3] | LCD Data-3 | 47 | 3 | - | Not connected | 34 |
| 4 | d[1] | LCD Data-1 | 45 | 4 | - | Not connected | 31 |
| 7 | d[6] | LCD Data-6 | 3 | 7 | rw | LCD RW Signal | 42 |
| 8 | d[4] | LCD Data-4 | 48 | 8 | - | Not connected | 36 |
| 9 | d[2] | LCD Data-2 | 46 | 9 | - | Not connected | 32 |
| 10 | d[0] | LCD Data-0 | 44 | 10 | - | Not connected | 28 |
| Board | Description |
|---|---|
| iCEBreaker | CharLCD Verilog demo for the iCEBreaker FPGA (Lattice ICE40UP5K) |
| Gatemate E1 | CharLCD Verilog demo for the Gatemate FPGA (Gatemate CCGM1A1) |
CharLCD PMOD, connected to the iCEBreaker board.
