AT42QT1040 Datasheet, PDF (2/18 Pages) ATMEL Corporation – QTouch™ 4-key Sensor IC

1. Pinout and Schematic
1.1 Pinout Configuration
SNS2
SNSK1
SNS1
SNSK0
SNS0
20 19 18 17 16
1
15
2
14
3 QT1040 13
4
12
5
11
6 7 8 9 10
SNSK3
OUT2
OUT3
OUT1
OUT0
Table 1-1. Pin Listing
Pin
Name
Type
Function
Notes
1
SNS2
I/O
Sense pin
To Cs2
2
SNSK1
I/O
Sense pin and
option detect
To Cs1 and option resistor + key
3
SNS1
I/O
Sense pin
To Cs1
4
SNSK0
I/O
Sense pin and
option detect
To Cs0 and option resistor + key
5
SNS0
I/O
Sense pin
To Cs0
6
N/C
–
–
7
N/C
–
–
8
Vss
P
Supply ground
9
Vdd
P
Power
10
N/C
–
–
11
OUT0
OD
Out 0
Alternative function: Debug CLK
12
OUT1
OD
Out 1
Alternative function: Debug DATA
13
OUT3
OD
Out 3
14
OUT2
OD
Out 2
15
SNSK3
I/O
Sense pin
To Cs3 + key
16
SNS3
I/O
Sense pin
To Cs3
17
N/C
–
–
18
N/C
–
–
19
N/C
–
–
20
SNSK2
I/O
Sense pin
To Cs2 + key
* Option resistor should always be fitted even if channel is unused and Cs capacitor is not fixed.
If Unused...
Leave open
Connect to option resistor*
Leave open
Connect to option resistor*
Leave open
–
–
–
–
–
Leave open
Leave open
Leave open
Leave open
Leave open
Leave open
–
–
–
Leave open
I/O CMOS input and output
OD CMOS open drain output
P Ground or power
2 AT42QT1040
9524B–AT42–04/09