ak4184a AKM Semiconductor, Inc., ak4184a Datasheet - Page 25

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

Addr
■ Keypad Data Register (PAGE 0)
The keypad data register format is shown below. KD1, KD2, KD3, KS1, KS2 and KS3 represent the number of keys
pressed.
as zero represents no key pressed. The AK4184A keypad scanner can be read out up to three keys simultaneously.
The AK4184A key pad scanner writes the number of keys pressed in the keypad data register. For example: When
two keys are pressed at the same time, the contents of the keypad register are filled with KD1, KD2, KS1, and KS2.
KD3 and KS3 are the zero data. When more than four keys are pressed at the same time, error bits (DERR bit and
SERR bit) are set to “1” and KD1, KD2, KD3, KS1, KS2, and KS3 data are set to 31.
The keypad data can be read out either from the KPDATA1 register or the KPDATA2 register. The KPDATA1
register represents the keypad data masked by the keypad column mask register. KPDATA2 register represents the
keypad data masked by both the keypad column mask register and the keypad mask register. KPDATA1 and
KPDATA2 register are cleared after these resisters are read.
The corresponding number and its keypad layout are shown on
MS0947-E-00
00H
01H
KPDATA1
KPDATA2
Table 24
NAME
14:10
14:10
Bits
Bits
9:5
4:0
9:5
4:0
15
15
shows a configuration of a 30-key keypad. Data of KD1, KD2, KD3, KS1, KS2 and KS3 returned
DERR
DERR
Name
Name
SERR
SERR
KD3
KD2
KD1
KS3
KS2
KS1
D15
D14
Keypad scan data error
Keypad scan result 3. can be masked by column mask
Keypad scan result 2. can be masked by column mask
Keypad scan result 1. can be masked by column mask
Keypad status data error
Keypad status result 3. can be masked by both keymask and column mask
Keypad status result 2. can be masked by both keymask and column mask
Keypad status result 1. can be masked by both keymask and column mask
Table 22. Keypad Data 1 Register (addr: 00H)
Table 23. Keypad Data 2 Register (addr: 01H)
D13
Table 24. Keypad to Key number Mapping
R1
R2
R3
R4
R5
Table 21. Keypad Data Register Format
KD3[4:0]
KS3[4:0]
D12
C1
#1
#2
#3
#4
#5
D11
C2
#6
#7
#8
#9
#10
- 25 -
D10
C3
#11
#12
#13
#14
#15
Description
Description
C4
#16
#17
#18
#19
#20
D9
Table
D8
C5
#21
#22
#23
#24
#25
24.
KD2[4:0]
KS2[4:0]
D7
C6
#26
#27
#28
#29
#30
D6
D5
D4
D3
KD1[4:0]
KS1[4:0]
D2
[AK4184A]
2008/04
D1
D0