[AK4184]
Scan Output 6
Scan Output 5
Scan Output 4
Scan Output 3
Scan Output 2
Scan Output 1
Drive High or
Hi-Z STATE
C1
C2
C3
C4
C5
C6
R1
1
2
3
4
5
6
7
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
R
key
R2
R
key
R3
8
R
key
R4
9
R
key
R5
10
Rkey
Rkey=16KΩ(typ.)
Figure 5. Key Press Detection Circuitry and KEY Number
Debounce Scan
Key pressed
Store the Key value
in the KPDATA1, the
KPDATA2 Register
Rx
Signal from
keypad
Key debounce time interval
Time
Oscillator
startup
Figure 6. Debounce Time Interval
MS0603-E-00
2007/04
13