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QST108 Datasheet(PDF) 15 Page - STMicroelectronics

Part # QST108
Description  Capacitive touch sensor device 8 keys with individual key state outputs or I2C interface
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

QST108 Datasheet(HTML) 15 Page - STMicroelectronics

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QST108
Device operating modes
15/38
Output mode option
The QST108 offers several outputs mode to fit any existing application.
4.5
I2C mode
The I2C mode offers the largest configurability and functionality of the QST108.
4.5.1
Main features
●
Five general-purpose outputs
●
Configuration of up to 8 AKS groups
●
Additional low power modes
●
Accessible internal capacitive sensing parameters
●
Continuous range of Max On-Duration
Table 7.
Output mode (OM) truth table
OPT6/OM
Description
VSS
Individual key state output mode: One output per sensing channel
VDD
BCD output mode: Binary-coded touched key number (see Table 8)(1)
1.
In BCD mode, the AKS function is always active.
Table 8.
Binary code truth table
KOUT4 KOUT3 KOUT2 KOUT1
Description
0
0
0
0
All released
0
0
0
1
Key 1 pressed
0
0
1
0
Key 2 pressed
0
0
1
1
Key 3 pressed
0
1
0
0
Key 4 pressed
0
1
0
1
Key 5 pressed
0
1
1
0
Key 6 pressed
0
1
1
1
Key 7 pressed
1
0
0
0
Key 8 pressed
Other
Not used



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