AT42QT2100 Datasheet PDF - ATMEL

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AT42QT2100
ATMEL

Part Number AT42QT2100
Description QTouch Touch Sensor IC
Page 30 Pages


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Atmel AT42QT2100
QTouch Touch Sensor IC
DATASHEET
Features
Number of QTouch® Keys:
– 0 to 7, one slider or one wheel
Technology:
– Patented spread-spectrum charge-transfer
Key Outline Sizes:
– 5 mm x 5 mm or larger (panel thickness dependent); widely different sizes
and shapes possible
Key Spacing:
– 6 mm or wider, center to center (panel thickness, human factors
dependent)
Key Design:
– Single solid or ring shaped electrodes; wide variety of possible layouts
Wheel Size:
– Typically 30 – 50 mm diameter, resistively interpolated wheel up to 80 mm
diameter, typical width 12 mm
Slider Size:
– Typically 50 – 100 mm length, typical width 12 mm
Slider/Wheel Electrode Design:
– Choice of spatially interpolated (resistorless) or resistively interpolated
design
– Slider can be an arc or other irregular shape
Layers Required:
– One layer substrate; electrodes and components can be on same side
Substrates:
– FR-4, low cost CEM-1 or FR-2 PCB materials; polyamide FPCB; PET films,
glass
Electrode Materials:
– Copper, silver, carbon, ITO, virtually anything electrically conductive
Panel materials:
– Plastic, glass, composites, painted surfaces (nonconductive paints)
Adjacent Metal:
– Compatible with grounded metal immediately next to keys
Panel Thickness:
– For keys, up to 15 mm glass, 10 mm plastic (key size dependent)
– For slider/wheel, up to 4 mm glass, 3 mm plastic
Key Sensitivity:
– Adjustable via change in sampling capacitor (Cs) value
9554E–AT42–01/13



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Interface:
– SPI @ 750 kHz, CHANGE and DRDY status indicator pins
Moisture Tolerance:
– Increased moisture tolerance based on hardware design and firmware tuning
Power:
– 2.0 V to 5.5 V
Signal Processing:
– Self-calibration, autodrift compensation, noise filtering, patented Adjacent Key Suppression® (AKS®)
Package:
– 32-pin 5 x 5 mm MLF RoHS compliant
– 32-pin 7 x 7 mm TQFP RoHS compliant
Applications:
– Portable devices, domestic appliances and A/V equipment, PC peripherals, office equipment
AT42QT2100 [DATASHEET]
9554E–AT42–01/13
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1. Pinout and Schematic
1.1 Pinout Configuration
SNSKB2
SNSB3
SNSKB3
VDD
VSS
SNSKB4
SNSB4
SNSB5
32 31 30 29 28 27 26 25
1 24
2 23
3 22
4
QT2100
21
5 20
6 19
7 18
8 17
9 10 11 12 13 14 15 16
SNSKA1
SNSA1
SPREAD
VSS
CHANGE
DRDY
VDD
SCK
1.2 Pin Descriptions
Table 1-1. Pin Listing
Pin Name
1 SNSKB2
2 SNSB3 (1)
3 SNSKB3
4 VDD
5 VSS
6 SNSKB4
7 SNSB4 (1)
8 SNSB5 (1)
9 SNSKB5
10 SNSKB6
11 SNSKB7
12 SNSB6 (1)
Type
I/O
I/O
I/O
P
P
I/O
I/O
I/O
I/O
I/O
I/O
I/O
Function
Sense pin. Connect to any CsB + Key
Sense pin. Connect to CsB3
Sense pin. Connect to any CsB + Key
Power
Ground
Sense pin. Connect to any CsB + Key
Sense pin. Connect to CsB4
Sense pin. Connect to CsB5
Sense pin. Connect to any CsB + Key
Sense pin. Connect to any CsB + Key
Sense pin. Connect to any CsB + Key
Sense pin. Connect to CsB6
If Unused, Connect To...
Open
Open
Open
-
-
Open
Open
Open
Open
Open
Open
Open
AT42QT2100 [DATASHEET]
9554E–AT42–01/13
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Table 1-1. Pin Listing (Continued)
Pin
Name
Type
13 SNSB7 (1) I/O
14 SS
I
15 MOSI
I
16 MISO OF
17 SCK
I
18 VDD
P
19 DRDY OF
20 CHANGE OF
21 VSS
P
22 SPREAD OD
23 SNSA1 (1) I/O
24 SNSKA1 I/O
25 SNSA2 (1) I/O
26 SNSKA2 I/O
27 SNSA3 (1) I/O
28 SNSKA3 I/O
29 RESET
I
30 SNSB1 (1) I/O
31 SNSKB1 I/O
32 SNSB2 (1) I/O
Function
Sense pin. Connect to CsB7
SPI Slave Select (active low)
SPI Master Out /Slave In
SPI Master In/Serial Out
SPI Clock
Power
SPI Data Ready handshake line
State change notification
Ground
Spread-spectrum drive
Connect to Vdd (high) to enable
Connect to Vss (low) to disable
Sense pin. Connect to CsA1
Sense pin. Connect to any CsA + slider/wheel
Sense pin. Connect to CsA2
Sense pin. Connect to any CsA + slider/wheel
Sense pin. Connect to CsA3
Sense pin. Connect to any CsA + slider/wheel
Reset (active low)
Sense pin. Connect to CsB1
Sense pin. Connect to any CsB + Key
Sense pin. Connect to CsB2
If Unused, Connect To...
Open
-
-
-
-
-
Open
Open
-
-
Open
Open
Open
Open
Open
Open
Vdd via resistor
Open
Open
Open
1. SNS terminals can be paired with any SNSK terminals of the same group. For example, SNSA1 can be paired with
any SNSKA terminal.
I/O CMOS input/output
I CMOS input only
OD CMOS open drain output (pull-up to Vdd)
OF CMOS output that can float during Reset, Sleep or LP modes
P Ground or power
AT42QT2100 [DATASHEET]
9554E–AT42–01/13
4



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