ak4184a AKM Semiconductor, Inc., ak4184a Datasheet - Page 13

• Manufacturer Part Number: ak4184a
• Description: Tsc With Keypad Scanner And Gpio Expander
• Manufacturer: AKM Semiconductor, Inc.

MS0947-E-00
Signal from
keypad
Scan Output 6
Scan Output 5
Scan Output 4
Scan Output 3
Scan Output 2
Scan Output 1
Rx
Drive High or
Hi-Z STATE
Figure 6. Key Press Detection Circuitry and KEY Number
Rkey=16KΩ(typ.)
Key pressed
R
R
R
R
R
Oscillator
startup
key
R2
key
key
key
key
R1
R3
R4
R5
Figure 7. Debounce Time Interval
C1
1
2
3
4
5
Key debounce time interval
C2
- 13 -
10
6
7
8
9
Debounce Scan
C3
11
12
13
14
15
Store the Key value
in the KPDATA1, the
KPDATA2 Register
C4
16
17
18
19
20
Time
C5
21
22
23
24
25
C6
26
27
28
29
30
[AK4184A]
2008/04