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.
