IS31IO7326 Debounced 8x8 Key-Scan Controller Evaluation Board Guide
Integrated Silicon Solution, Inc. – www.issi.com
2
R1.0, 08/23/2012
Evaluation Board Operation
K0 to K63 are push buttons on the demo
board. When each of the button is pressed
briefly, a number corresponding to the key will
be displayed. When the button is pressed
and held for a few seconds, the period dot will
also be displayed. If two buttons are
pressed at the same time, the corresponding
key numbers will be displayed.
Note:
IS31IO7326 solely controls the Key-Scan function on the
evaluation board.
Software support
Note:
JP1 is set to close circuit by default. If it is set to open, the
on-board MCU will stop working. The pins driving the I2C pin
from MCU will be set to High Impedance. External control
signals can be connected to TP3 port to control the IS31IO7326.
Refer to the datasheet to get more information about
IS31IO7326.
f
10
g
5
e
1
d
2
H
4
6
c
4
DP
3
b
7
a
11
DIG1
K0
K8
K16
K24
K32
K40
K48
K56
K1
K9
K17
K25
K33
K41
K49
K57
K2
K10
K18
K26
K34
K42
K50
K58
K3
K11
K19
K27
K35
K43
K51
K59
K4
K12
K20
K28
K36
K44
K52
K60
K5
K13
K21
K29
K37
K45
K53
K61
K6
K14
K22
K30
K38
K46
K54
K62
K7
K15
K23
K31
K39
K47
K55
K63
100K
R5
100K
R6
100K
R7
100K
R8
100K
R9
100K
R10
100K
R11
100K
R12
VCC
1uF
C2
SDA
SCL
VCC
4.7K
R1
4.7K
R2
H
3
8
H
2
9
H
1
1
2
10nF
C5
VDD
1
GND
2
SD
3
BP
4
VOUT
5
U2
PAM3101
1uF
C6
3V
VCC
CON1
DC IN
10uF
C1
1uF
C4
TP1
TP2
PP0
1
PP1
2
PP2
3
PP3
4
OD0
5
OD1
6
OD2
7
OD3
8
GND
9
OD4
10
OD5
11
OD6
12
OD7
13
PP4
14
PP5
15
PP6
16
PP7
17
AD0
18
SCL
19
SDA
20
VCC
21
INT
22
RST
23
AD1
24
U1
IS31IO7326
100K
R3
4.7K
R4
3V
INT
RST
DP
g
f
e
d
c
b
a
C1
C2
C3
C4
PP0
PP1
PP2
PP3
PP4
PP5
PP6
PP7
OD0
OD1
OD2
OD3
OD4
OD5
OD6
OD7
PP0
PP1
PP2
PP3
PP4
PP5
PP6
PP7
OD0
OD1
OD2
OD3
OD4
OD5
OD6
OD7
P0.0/CMP2/KBI0
1
P1.7
2
P1.6
3
P1.5/RST
4
VSS
5
P3.1/XTAL1
6
P3.0XTAL2/CLKOUT
7
P1.4/INT1
8
P1.3/INT0/SDA
9
P1.2/T0/SCL
10
P1.1/RXD
11
P1.0/TXD
12
P0.7/T1/KBI7
13
P0.6/CMP1/KBI6
14
VDD
15
P0.5/CMPREF/KBI5
16
P0.4/CIN1A/KBI4
17
P0.3/CIN1B/KBI3
18
P0.2/CIN2A/KBI2
19
P0.1/CIN2B/KBI1
20
U3
LPC922
3V
JP1
OPEN=EXT CTRL
RST
SDA
SCL
1
2
3
4
5
TP4
3V
P0.5
P0.4
RESET
GND
P0.5
P0.4
RESET
INT
1
2
3
4
5
TP3
INT
RST
SDA
SCL
GND
1uF
C3
VCC
SDA
SCL
SDA
1
SCL
2
SDB
3
IN
4
C_FILT
5
AD
6
C6
18
C5
19
C4
21
C3
22
VDD
11
C2
23
C1
24
R1
7
R2
8
R3
9
R4
10
R5
12
R6/C11
13
GND
20
R7/C10
14
R8/C9
15
C7
17
C8
16
U4
IS31FL3728
C1
C2
C3
C4
a
b
c
d
e
f
g
DP
Figure 2:IS31IO7326 Application Schematic
