| pin | name | direction | description | color |
| 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 | |
