QST102 STMicroelectronics, QST102 Datasheet - Page 10

• Manufacturer Part Number: QST102
• Description: Capacitive Touch Sensor Device 2 Keys With Individual Key State Outputs
• Manufacturer: STMicroelectronics

Device operating mode
4
4.1
4.2
4.3
10/29
Device operating mode
Main features
●
●
●
●
Figure 5.
Power-up
At power-up the device configures itself. During this phase, it reads the AKS option through
the option resistor on pin KOUT1.
KOUT output
KOUTn output pins directly reflect the state of the corresponding key. These pins are push-
pull outputs.
During QST device reset phase:
●
●
KOUTn output pins are active high, meaning when the key is “touched”, the pin outputs a ‘1’.
Key 1
Key 2
Pins KOUT1 and KOUT2 directly reflect the state of keys
Selectable locking adjacent key suppression (AKS™)
Max On-Duration feature
Serial validation interface (SVI)
pin KOUT1 is floating and its state depends on the option resistor
pin KOUT2 is output push pull high
Keep these parts close to IC
10kΩ
10kΩ
QST102 schematic diagram
V
UNREG
10kΩ
R
4.7µF
SVI
C
C
S
S
7
6
2
3
Volt. Reg.
2.4~5.5V
SNSK_SCK1/SVI1
SNS_SCK1/SVI0
SNSK_SCK2
SNS_SCK2
4.7µF
SVI_DATA/AKS/KOUT1
V
100nF
SS
8
SVI_CLK/KOUT2
V
DD
1
5 (HS)
4
V
DD
1MΩ
1nF
V
V
KOUT2
KOUT1
DD
SS
QST102
Ai12586