M10 Hardware Design
M10_HD_V3.0 - 56 -
3.11. Keypad interface
The keypad interface consists of 5 keypad column inputs and 5 keypad row outputs. The basic
configuration is 5 keypad columns and 5 keypad rows, giving 25 keys.
Table 17: Pin definition of the keypad interface
The keypad interface allows a direct external matrix connection. A typical recommended circuit
about the keypad is shown in the following figure.
VPP C6 Not Connect
SIM_DATA C7 SIM Card Data I/O
SIM_DETECT C8 Pulled down GND with external circuit. When the tray is
present, C4 is connected to C8.
Name Pin Function
KBC0 33
Keypad matrix column
KBC1 34
KBC2 35
KBC3 36
KBC4 37
KBR0 28
Keypad matrix row
KBR1 29
KBR2 30
KBR3 31
KBR4 32
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