BS801C/02C/04C/06C/08C
Pin Assignment
K
K
K
K
e
e
e
e
y
y
y
y
0
1
2
3
K
K
K
K
S
V
O
L
o
o
o
o
C
D
u
u
u
u
t
t
t
t
0
1
2
3
1
2
3
4
5
6
7
8
1
1
1
1
1
1
1
6
5
4
3
2
1
0
V
F
D
C
D
r
e
f
L
H
5
6
4
K
e
y
0
C
K
V
L
r
e
f
K
K
K
e
e
e
y
y
y
1
2
3
K
S
V
V
e
C
D
S
y
0
C
r
e
f
D
D
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
T
o
p
V
i
e
w
K
K
o
o
u
u
t
t
1
0
e
D
y
1
D
D
V
S
S
D
N
N
C
C
K
W
2
3
1
V
S
S
H
F
C
r
e
f
S
H
F
9
K e
S
y
V
S
t
K
o
u
B
S
8
0
1
C
B
S
8
0
2
C
B
S
8
0
4
C
B
S
8
0
4
C
S
O
T
2
3
-
6
-
A
8
S
O
P
-
A
8
S
O
P
-
A
1
6
N
S
O
P
-
A
K
K
K
K
K
K
K
K
e
e
e
e
e
e
e
e
y
y
y
y
y
y
y
y
0
1
2
3
4
5
6
7
2
1
1
1
1
1
1
1
1
1
0
9
8
7
6
5
4
3
2
1
K
K
K
K
K
K
K
K
V
O
o
o
o
o
o
o
o
o
u
u
u
u
u
u
u
u
t
t
t
t
t
t
t
t
0
1
2
3
4
5
6
7
1
2
3
4
5
6
7
8
9
1
K
K
K
K
K
K
e
e
e
e
e
e
y
y
y
y
y
y
0
1
2
3
4
5
K
K
K
K
K
K
V
O
o
o
o
o
o
o
D
u
u
u
u
u
u
t
t
t
t
t
t
0
1
2
3
4
5
K
K
K
K
K
K
e
e
e
e
e
e
y
y
y
y
y
y
0
1
4
5
6
7
K
K
N
N
N
S
V
V
e
e
y
y
2
3
1
2
3
4
5
6
7
8
1
1
1
1
1
1
1
6
5
4
3
2
1
0
1
2
3
4
5
6
7
8
1
1
1
1
1
1
1
6
5
4
3
2
1
0
C
C
C
C
D
S
D
D
C
r
e
f
D
C
r
e
f
C
r
e
f
D
D
V
S
S
K
W
N
C
S
V
S
S
K
W
9
9
0
B
S
8
0
6
C
B
S
8
0
8
C
B
S
8
0
8
C
1
6
N
S
O
P
-
A
1
6
N
S
O
P
-
A
2
0
S
O
P
-
A
/
S
S
O
P
-
A
Pin Description
The pins in the following table are common to all devices.
Pin Name
I/O
Description
Key0~Keyn
Input Touch key n input. These pins are connected to the external touch key.
Kout0~Koutn Output Touch key n output pin.
Touch key reference capacitor input - value range of 0pF to 10pF - higher capacitance val-
ues result in higher sensitivities.
Cref
Input
VSS
VDD
Negative power supply, ground
Positive power supply
¾
¾
The following table shows device specific pins.
Pin Name
I/O
Device
Description
Selects One-key State or Any-key State.
Pin condition is read during power-up. The logic status of this pin must not be
changed after power-on. After power-on this pin¢s function can be overridden
by a serial command on relevant devices. Pin connected to an internal
pull-high resistor. Internal circuitry ensures that this pull high resistor will not
consume current even if the input is low.
BS804C
BS806C
BS808C
OKW
Input
Open: One-key State using key0 only
Low: Any-Key State
Serial bus pin used to communicate with an external MCU. The external MCU
can read the BS804C or BS808C touch key status and also send commands
to the device via this pin.
Input/
BS804C
BS808C
SCD
LHF
Output
Selects Key Output Type
Pin condition is read during power-up. The logic status of this pin must not be
changed after power-on. After power-on this pin¢s function can be overridden
by a serial command on relevant devices. Pin connected to an internal
pull-high resistor. Internal circuitry ensures that this pull high resistor will not
consume current even if the input is low.
BS801C
BS802C
BS804C
Input
Open: Level-Hold output
Low: Toggle output
Note: It is important that the logic level of the OKW and LHF pins do not change state after power-on.
Rev. 1.00
2
December 2, 2009
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
