QST104 STMicroelectronics, QST104 Datasheet - Page 13

• Manufacturer Part Number: QST104
• Description: Capacitive touch sensor device 4 keys
• Manufacturer: STMicroelectronics

QST104
4.5.2
Figure 3.
KOUT outputs
KOUTn outputs directly reflect the state of keys. These pins are push-pull 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
Key4
Key3
Key2
Key1
UNREG
Keep these parts close to IC
4.7µF
R
R
R
R
S4
S3
S2
S1
Stand-alone mode typical schematic
10kΩ
Volt. Reg.
10kΩ
10kΩ
2.4~5.5V
10kΩ
C
C
C
C
S4
S3
S2
S1
21
20
19
18
17
16
15
14
4.7µF
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_0/KOUT4
MODE/KOUT1
13
11
AKS/KOUT2
LP/KOUT3
V
100nF
DD
MOD_1
RESET
V
SS_4
OM
12
6
3
2
1
32
31
30
1MΩ
1MΩ
1MΩ
1MΩ
1MΩ
1MΩ
10nF
Device operating modes
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V
V
V
V
V
V
V
V
V
V
V
KOUT4
KOUT3
KOUT2
KOUT1
DD
SS
DD
SS
DD
SS
DD
SS
DD
SS
DD
To Host
Ai12572
Binary-
coded
Output
Mode
13/45