3.11. Keypad Interface¶
| Pin | Signal | Description | type | I/O |
|---|---|---|---|---|
| 72 | KP_COL[0] | Keypad Column selection signals. | VDDIO | |
| 73 | KP_COL[1] | VDDIO | ||
| 74 | KP_COL[2] | VDDIO | ||
| 75 | KP_COL[3] | VDDIO | ||
| 76 | KP_COL[4] | VDDIO | ||
| 77 | KP_ROW[0] | Keypad Row selection signals. | VDDIO | |
| 78 | KP_ROW[1] | VDDIO | ||
| 79 | KP_ROW[2] | VDDIO | ||
| 80 | KP_ROW[3] | VDDIO | ||
| 81 | KP_ROW[4] | VDDIO | ||
| Module | Remark | |||
| TX28 | A PCA9554 8-bit I2C-bus I/O port is used for KP_COL[0-3] and KP_ROW[0-3]. KP_COL[4], KP_ROW[4] is not part of the keypad interface, used for CAN instead. | |||
| TX25, TX48, TX53, TX6 | KP_COL[4], KP_ROW[4] can also be used for the 1st CAN interface. | |||
The Keypad Port (KPP) is designed to interface with the keypad matrix with 2-point contact or 3-point contact keys. The KPP is designed to simplify the software task of scanning a keypad matrix. With appropriate software support, the KPP is capable of detecting, debouncing, and decoding one or multiple keys pressed simultaneously on the keypad.
