| Pin | Name | Direction | Color | Description |
| 1 | ROW0 | | | ROW0 - Keyboard matrix row 0 |
| 2 | ROW1 | | | ROW1 - Keyboard matrix row 1 |
| 3 | ROW2 | | | ROW2 - Keyboard matrix row 2 |
| 4 | ROW3 | | | ROW3 - Keyboard matrix row 3 |
| 5 | ROW4 | | | ROW4 - Keyboard matrix row 4 |
| 6 | COL0 | | | COL0 - keyboard matrix column 0 (flip identification) |
| 7 | COL1 | | | COL1 - keyboard matrix column 1 |
| 8 | COL2 | | | COL1 - keyboard matrix column 2 |
| 9 | COL3 | | | COL1 - keyboard matrix column 3 |
| 10 | COL4 | | | COL1 - keyboard matrix column 4 |
| 11 | Signal1 | | | Signal1 - flip interrupt (not used) |
| 12 | VF_IN | | | VF_IN - Flash In |
| 13 | VF_OUT | | | VF_OUT - Flash Out |
| 14 | VBATT | | | VBATT - Battery Voltage |
| 15 | UAGND | | | UAGND - Analog Gnd |
| 16 | PWRON | | | PWRON - Power On key |
| 17 | LCDCDX | | | LCDCDX - LCD driver code/data selection |
| 18 | SCLK | | | SCLK - LCD driver serial clock |
| 19 | SDA | | | SDA - LCD driver serial data |
| 20 | LCDCSX | | | LCDCSX - LCD driver chip select |
| 21 | LCDRSTX | | | LCDRSTX - LCD driver reset |
| 22 | UDGND | | | UDGND - Digital Gnd |
| 23 | BUZZER | | | BUZZER - Buzzer PWM control |
| 24 | VL | | | VL - Supply voltage |
| 25 | SPARE | | | SPARE - Call indicator LED |
| 26 | LIGHT | | | LIGHT - Illumination control |
| 27 | EARN | | | EARN - Speaker neutral |
| 28 | EARP | | | EARP - Speaker positive |
