AK4184 Datasheet, PDF (13/36 Pages) Asahi Kasei Microsystems – TSC with Keypad Scanner and GPIO Expander

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