AKD4184-A Datasheet, PDF (4/24 Pages) Asahi Kasei Microsystems – Analog I/F IC which includes 4-wire resistive Touch Screen Controller

ASAHI KASEI
[AKD4184-A]
(2) Keypad scan function.
It is possible to evaluate Keypad scan function with pushing SW1~SW30 with AKD4184.
The circuit and the pin configuration for Keypad is shown on Figure 2.
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 2. Keypad circuit and pin assign
Keypad Control Register in AKD4184 should be set to Keypad scan mode.
Per pushing any SWs, the AK4184’s register should be read the Keypad Data Register (KPDATA1, 2) after the
key is pressed.
(3) GPIO control function.
(3-1) GPIO pin as input port
The input level switches by S1 (L/H).
S1
GP0 GP1 GP2 GP3 GP4 GP5 GP6 GP7
12345678 _H
ʕʕʕʕʕʕ OFF ʕʕʕʕʕʕ ^L
Figure 3. S1 input ports state setting
<KM085900>
-4-
2007/04