N58 Hardware User Guide
Chapter 5 Application Interfaces
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5.6.8 Keypad
N58 supports matrix keyboard (4x3: 4 rows and 3 columns). The following table provides the
description of keypad pins.
Pin Name
Pin No.
I/O
Function
Remarks
KEYOUT3
130
DO
Key output
Leave this pin floating if it is not used.
KEYOUT2
131
DO
Key output
Leave this pin floating if it is not used.
KEYOUT1
132
DO
Key output
Leave this pin floating if it is not used.
KEYOUT0
133
DO
Key output
Leave this pin floating if it is not used.
KEYIN1
134
DI
Key input
Leave this pin floating if it is not used.
KEYIN2
135
DI
Key input
Leave this pin floating if it is not used.
KEYIN3
136
DI
Key input
Leave this pin floating if it is not used.
Figure 5-36 Keypad reference design
1k
Ω
1k
Ω
1k
Ω
1k
Ω
1k
Ω
1k
Ω
1k
Ω
KEYOUT0
KEYOUT1
KEYOUT2
KEYOUT3
K
E
Y
IN
1
K
E
Y
IN
2
K
E
Y
IN
3
Schematic design guidelines:
To improve the ESD performance of the keypad interface, an ESD protection component must be
added to the keypad interface, and a 1 kΩ resistor must be connected in series with the signal cable.
