Specifications

Wireless CPU

Q24 Series

Interfaces

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WM_PRJ_Q24NG_PTS_001-004

January 16, 2007

3.5 Keyboard Interface

Equivalent circuit

An AT command or Open AT

API allows the input key code to be obtained (see the

AT+CMER command description). This code must then be processed by the

application.

For a total of 25 keys (5 rows x 5 columns), the keyboard interface provides 10

connections:

• 5 rows (ROW0 to ROW4) and

• 5 columns (COL0 to COL4)

The scanning is digital, and the debouncing is performed in the Wireless CPU

. No

discrete components such as R, C (Resistor, Capacitor) are needed.

Key

2V8

GND

2V8

Key Press

Detector

Row0

Col0

D Q

COLUMN 0

COLUMN 4

CLOCK

GND

COLUMN [0]

Key Release

Detector

Q D

ROW 0

ROW 4

ROWCK

ROW [0]

Select