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QST104 Datasheet(PDF) 17 Page - STMicroelectronics

Part # QST104
Description  Capacitive touch sensor device 4 keys with individual key state outputs or I2C interface
PDF  45 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

QST104 Datasheet(HTML) 17 Page - STMicroelectronics

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QST104
Device operating modes
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4.6.2
General-purpose outputs
I2C mode allows to drive up to 13 general-purpose outputs. These output pins are
configured in output push pull mode 0 by default. Their state can be changed using the
SET_GPIO_STATE I2C command.
Figure 4.
I2C mode typical schematic
Ai12573
I2C_SCL
I2C_SDA
ADD2/GPO4
ADD1/GPO3
ADD0/GPO2
MODE/GPO1
VSS_1
VSS_2
VSS_3
VSS_4
SNS_SCK1
SNSK_SCK1
VDD_1
VDD_2
RESET
IRQ
Key1
VDD
To
Host
MCU
RS1
10k
Ω C
S1
SNS_SCK2
SNSK_SCK2
Key2
RS2
10k
Ω C
S2
SNS_SCK3
SNSK_SCK3
Key3
RS3
10k
Ω C
S3
SNS_SCK4
SNSK_SCK4
Key4
RS4
10k
Ω C
S4
VUNREG
4.7µF
4.7µF
2.4~5.5V
Volt. Reg.
100nF
100nF
To Host
10nF
Keep these parts close to IC
3
4
5
6
8
910
11
12
13
14
15
16
17
18
19
20
21
1
30
31
32
GPO9
25
GPO9
1M
Ω
VDD
VSS
GPO4
1M
Ω
VDD
VSS
GPO3
1M
Ω
VDD
VSS
GPO2
1M
Ω
VSS
GPO1
VDD
GPO10
26
GPO10
GPO11
27
GPO11
GPO12
28
GPO12
GPO5
2
GPO5
GPO6
22
GPO6
GPO7
23
GPO7
GPO8
24
GPO8
GPO13
29
GPO13



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