Extension connector EXT5 is a special connector for segment LCD displays. SAM L22 Xplained Pro implements one segment LCD extension connector for Xplained Pro extensions and supports up to eight COM, twenty seven SEG and six touch signals. The connector has a standardized pin-out as shown in the table below.
| EXT5 pin | SAM L22 pin | Function | Shared functionality |
|---|---|---|---|
| 1 [COM3] | PC06 | SLCD/ LP[9] | Shield |
| 2 [COM2] | PC05 | SLCD/ LP[8] | Shield |
| 3 [COM1] | PA07 | SLCD/ LP[7] | Shield and EXT3 |
| 4 [COM0] | PA06 | SLCD/ LP[6] | Shield and EXT3 |
| 5 [SEG0] | PA11 | SLCD/ LP[14] | EXT3 |
| 6 [SEG1] | PC08 | SLCD/ LP[15] | |
| 7 [SEG2] | PC09 | SLCD/ LP[16] | |
| 8 [SEG3] | PC10 | SLCD/ LP[17] | |
| 9 [SEG4] | PC11 | SLCD/ LP[18] | Shield and Shield (2) |
| 10 [SEG5] | PC12 | SLCD/ LP[19] | Shield and Shield (2) |
| 11 [SEG6] | PC13 | SLCD/ LP[20] | Shield and Shield (2) |
| 12 [SEG7] | PB11 | SLCD/ LP[21] | Shield |
| 13 [SEG8] | PB12 | SLCD/ LP[22] | Shield |
| 14 [SEG9] | PB13 | SLCD/ LP[23] | Shield |
| 15 [SEG10] | PB14 | SLCD/ LP[24] | Shield |
| 16 [SEG11] | PB15 | SLCD/ LP[25] | Shield |
| 17 [SEG12] | PC14 | SLCD/ LP[26] | Shield |
| 18 [SEG13] | PC15 | SLCD/ LP[27] | Shield |
| 19 [SEG14] | PA14 | SLCD/ LP[30] | EXT3 |
| 20 [SEG15] | PA15 | SLCD/ LP[31] | EXT3 |
| 21 [SEG16] | PC16 | SLCD/ LP[36] | EXT3 |
| 22 [SEG17] | PC17 | SLCD/ LP[37] | EXT3 |
| 23 [SEG18] | PC18 | SLCD/ LP[38] | |
| 24 [SEG19] | PC19 | SLCD/ LP[39] | |
| 25 [SEG20] | PC20 | SLCD/ LP[40] | |
| 26 [SEG21] | PC21 | SLCD/ LP[41] | |
| 27 [SEG22] | PB16 | SLCD/ LP[42] | EXT3 |
| 28 [SEG23] | PB17 | SLCD/ LP[43] | EXT3 |
| 29 [SEG24] | PB18 | SLCD/ LP[44] | EXT3 |
| 30 [SEG25] | PB19 | SLCD/ LP[45] | EXT3 |
| 31 [SEG26] | PB20 | SLCD/ LP[46] | Shield |
| 32 [SEG27] | - | ||
| 33 [SEG28] | - | ||
| 34 [SEG29] | - | ||
| 35 [SEG30] | - | ||
| 36 [SEG31] | - | ||
| 37 [SEG32/QT_X2 ] | PB07 | PTC/XY[13] | |
| 38 [SEG33/QT_Y2] | PB04 | PTC/XY[10] | EDBG GPIO0, EXT2, and XAM |
| 39 [SEG34/QT_X1] | PB06 | PTC/XY[12] | QTBTN1 |
| 40 [SEG35/QT_Y1] | PB05 | PTC/XY[11] | EDBG GPIO1, EXT2, and XAM |
| 41 [SEG36/QT_X0] | PC28 | PTC/XY[20] | EXT2 |
| 42 [SEG37/QT_Y0] | PA27 | PTC/XY[21] | EXT2 |
| 43 [COM4] | PC07 | SLCD/ LP[10] | Shield |
| 44 [COM5] | PA08 | SLCD/ LP[11] | EXT3 |
| 45 [COM6] | PA09 | SLCD/ LP[12] | EXT3 |
| 46 [COM7] | PA10 | SLCD/ LP[13] | EXT3 |
| 47 [Backlight V+] | - | VCC_P3V3 | |
| 48 [Backlight V-] | - | GND | |
| 49 [Backlight CTRL] | PC27 | TC3/WO[1] | User LED0 |
| 50 [ID] | - | Xplained Pro ID | Communication line to ID chip on extension board |
| 51 [GND] | - | GND |