AK4184A Datasheet, PDF (13/36 Pages) Asahi Kasei Microsystems – TSC with Keypad Scanner and GPIO Expander

[AK4184A]
Scan Output 6
Scan Output 5
Scan Output 4
Scan Output 3
Scan Output 2
Scan Output 1
Drive High or
Hi-Z STATE
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3

3LFZ
3











3LFZ
3






3LFZ
3






3LFZ
3






3LFZ
3LFZ,Њ UZQ
Figure 6. Key Press Detection Circuitry and KEY No.
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 7. Debounce Time Interval
MS0947-J-00
-13-
2008/04