at42qt2100 ATMEL Corporation, at42qt2100 Datasheet - Page 4

• Manufacturer Part Number: at42qt2100
• Description: Qtouch Touch Sensor Ic
• Manufacturer: ATMEL Corporation

1.3
4
Schematic
AT42QT2100
Figure 1-1.
Important Design Guidelines:
Re
• The sensitivities of the various sense channels are determined by the values of the
• Signals DRDY and CHANGE may need pull-down resistors.
•
•
•
SS
MOSI
MISO
SCK
DRDY
CHANGE
respective Cs capacitors (that is, CsB1, CsB7, and so on); these values will require
adjustment based on building a prototype product and testing the sensitivity experimentally.
Section 3.1 on page
Section 3.2 on page
Section 3.3 on page
Figure
VDD
1-1, check the following sections for the variable component values:
GND
R1
R4
Connection Diagram (32-MLF Package)
R2
R5
R3
29
22
14
15
16
17
19
20
RESET
SPREAD
SS
MOSI
MISO
SCK
DRDY
CHANGE
8: Cs capacitors (CsB)
8: Sample resistors (R
8: Voltage levels
GND
SNSKB7
SNSKB1
SNSKB2
SNSKB3
SNSKB4
SNSKB5
SNSKB6
SNSKA1
SNSKA2
SNSKA3
SNSB4
SNSA1
SNSA2
SNSA3
SNSB1
SNSB2
SNSB3
SNSB5
SNSB6
SNSB7
7
11
30
31
32
1
2
3
6
8
9
12
10
13
23
24
25
26
27
28
SNS
VCC
CsB1
CsB2
CsB3
CsB4
CsB5
CsB6
CsB7
CsA1
CsA2
CsA3
)
C1
RsB1
RsB2
RsB3
RsB4
RsB5
RsB6
RsB7
RsA1
RsA2
RsA3
C2
Voltage Regulator
Vin
GND
Vout
Key B1
Key B3
Key B5
Key B7
QT Key
QT Key
QT Key
QT Key
9554CX–AT42–11/11
C3
Wheel/Slider
Ch1
Ch2
Ch3
Key B2
Key B4
Key B6
QT Key
QT Key
QT Key
VDD
C4