QST108 STMicroelectronics, QST108 Datasheet - Page 15

• Manufacturer Part Number: QST108
• Description: Capacitive Touch Sensor Device 8 Keys With Individual Key State Outputs Or I2c Interface
• Manufacturer: STMicroelectronics

QST108
4.5.2
Figure 3.
KOUT outputs
KOUTn outputs directly reflect the state of keys. These pins are push-pull outputs except for
pins KOUT7 and KOUT8 which are true open-drain outputs. Under RESET, these pins are
floating and their state depends on the option resistors. Pins KOUTn are active high
meaning that when a key is “touched”, the corresponding KOUT pin outputs a ‘1’.
V
Key8
Key7
Key6
Key5
Key4
Key3
Key2
Key1
UNREG
Keep these parts close to IC
4.7µF
R
R
R
R
R
R
R
R
Stand-alone mode typical schematic
S8
S7
S6
S5
S4
S3
S2
S1
10kΩ
10kΩ
Volt. Reg.
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
2.4~5.5V
10kΩ
C
C
C
C
C
C
C
C
S8
S7
S6
S5
S4
S3
S2
S1
17
4.7µF
29
28
27
26
25
24
23
22
21
20
19
18
16
15
14
SNSK_SCK8
SNS_SCK8
SNSK_SCK7
SNS_SCK7
SNSK_SCK6
SNS_SCK6
SNSK_SCK5
SNS_SCK5
SNSK_SCK4
SNS_SCK4
SNSK_SCK3
SNS_SCK3
SNSK_SCK2
SNS_SCK2
SNSK_SCK1
SNS_SCK1
V
SS_1
100nF
9
V
V
DD_1
SS_2
8
10
V
V
DD_2
SS_3
MOD_1/KOUT5
MOD_0/KOUT4
MODE/KOUT1
13
11
AKS/KOUT2
OM/KOUT6
LP/KOUT3
V
100nF
DD
RESET
KOUT8
KOUT7
V
SS_4
12
6
5
4
3
2
1
32
31
30
10kΩ
V
DD
1MΩ
1MΩ
1MΩ
1MΩ
1MΩ
1MΩ
10nF
Device operating modes
V
DD
10kΩ
KOUT8
KOUT7
KOUT6
V
V
KOUT5
V
V
KOUT4
V
V
KOUT3
V
V
KOUT2
V
V
KOUT1
V
DD
SS
DD
SS
DD
SS
DD
SS
DD
SS
DD
To Host
Ai12560
Binary-
coded
Output
Mode
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