The LCD connector provides the ability to connect to display extensions that have a parallel interface. The connector implements signals for a MCU parallel bus interface and a LCD controller interface as well as signals for a touch controller. The connector pin-out definition is shown in Table 1. Note that usually only one display interface is implemented, either the LCD controller or the MCU bus interface.
A FPC/FFC connector with 50 pins and 0.5mm pitch is used for the LCD connector. The connector XF2M-5015-1A from Omron is used on several Xplained Pro designs and can be used as a reference.
| Pin number | Name | RGB interface description | MCU interface description |
|---|---|---|---|
| 1 | ID | Communication line to the ID chip on an extension board | |
| 2 | GND | Ground | |
| 3 | D0 | Data line | |
| 4 | D1 | Data line | |
| 5 | D2 | Data line | |
| 6 | D3 | Data line | |
| 7 | GND | Ground | |
| 8 | D4 | Data line | |
| 9 | D5 | Data line | |
| 10 | D6 | Data line | |
| 11 | D7 | Data line | |
| 12 | GND | Ground | |
| 13 | D8 | Data line | |
| 14 | D9 | Data line | |
| 15 | D10 | Data line | |
| 16 | D11 | Data line | |
| 17 | GND | Ground | |
| 18 | D12 | Data line | |
| 19 | D13 | Data line | |
| 20 | D14 | Data line | |
| 21 | D15 | Data line | |
| 22 | GND | Ground | |
| 23 | D16 | Data line | |
| 24 | D17 | Data line | |
| 25 | D18 | Data line | |
| 26 | D19 | Data line | |
| 27 | GND | Ground | |
| 28 | D20 | Data line | |
| 29 | D21 | Data line | |
| 30 | D22 | Data line | |
| 31 | D23 | Data line | |
| 32 | GND | Ground | |
| 33 | PCLK / CMD DATA SEL | Pixel clock | Display RAM select. One address line of the MCU for displays where it is possible to select either register or data interface. |
| 34 | VSYNC / CS | Vertical Synchronization | Chip select |
| 35 | HSYNC / WE | Horizontal Synchronization | Write enable signal |
| 36 | DATA ENABLE / RE | Data enable signal | Read enable signal |
| 37 | SPI SCK | Clock for serial peripheral interface | |
| 38 | SPI MOSI | Master out slave in of serial peripheral interface | |
| 39 | SPI MISO | Master in slave out of serial peripheral interface | |
| 40 | SPI SS | Slave select for serial peripheral interface. Preferably a dedicated pin. | |
| 41 | ENABLE | Display enable | |
| 42 | I2C SDA | I2C data | |
| 43 | I2C SCL | I2C clock | |
| 44 | IRQ1 | Interrupt 1 | |
| 45 | IRQ2 | Interrupt 2 | |
| 46 | PWM | Backlight control | |
| 47 | RESET | Extension reset | |
| 48 | VCC | 3.3V power supply for extension board | |
| 49 | VCC | 3.3V power supply for extension board | |
| 50 | GND | Ground | |