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PDF AT42QT2100 Data sheet ( Hoja de datos )
| Número de pieza | AT42QT2100 | |
| Descripción | QTouch Touch Sensor IC | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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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
1 page  
1.3 Schematic
Figure 1-1. Connection Diagram (32-MLF Package)
VDD
R1 R2 R3
29 RESET
22 SPREAD
SS
MOSI
MISO
SCK
DRDY
CHANGE
R4 R5
14 SS
15 MOSI
16 MISO
17 SCK
19 DRDY
20 CHANGE
GND
SNSB1
SNSKB1
SNSB2
SNSKB2
SNSB3
SNSKB3
SNSB4
SNSKB4
SNSB5
SNSKB5
SNSB6
SNSKB6
SNSB7
SNSKB7
30
31
32
1
2
3
7
6
8
9
12
10
13
11
CsB1
CsB2
CsB3
CsB4
CsB5
CsB6
CsB7
SNSA1
SNSKA1
SNSA2
SNSKA2
SNSA3
SNSKA3
23
24
25
26
27
28
CsA1
CsA2
CsA3
RsB1
RsB2
RsB3
RsB4
RsB5
RsB6
RsB7
RsA1
RsA2
RsA3
Key B1
QT Key
Key B3
QT Key
Key B5
QT Key
Key B7
QT Key
Key B2
QT Key
Key B4
QT Key
Key B6
QT Key
Wheel/Slider
Ch1
Ch2
Ch3
VCC
C1
Voltage Regulator
Vin Vout
C2
VDD
C3 C4
GND
GND
Important Design Guidelines:
The sensitivities of the various sense channels are determined by the values of the 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.
Signals DRDY and CHANGE may need pull-down resistors.
Re Figure 1-1, check the following sections for the variable component values:
Section 3.1 on page 9: Cs capacitors (CsB)
Section 3.2 on page 9: Sample resistors (RSNS)
Section 3.3 on page 9: Voltage levels
AT42QT2100 [DATASHEET]
9554E–AT42–01/13
5
5 Page 
3.8 PCB Cleanliness
Modern no-clean-flux is generally compatible with capacitive sensing circuits.
CAUTION: If a PCB is reworked to correct soldering faults relating to the QT2100, or to
any associated traces or components, be sure that you fully understand the nature of the
flux used during the rework process. Leakage currents from hygroscopic ionic residues
can stop capacitive sensors from functioning. If you have any doubts, a thorough
cleaning after rework may be the only safe option.
3.9 Spread-spectrum Circuit
The QT2100 offers the ability to spectrally spread its frequency of operation to heavily reduce susceptibility to
external noise sources and to limit RF emissions.
With this option enabled, bursts operate over a spread of frequencies, so that external fields will have minimal effect
on key operation and emissions are very weak. Spread-spectrum operation works together with the Detect Integrator
(DI) mechanism to dramatically reduce the probability of false detection due to noise.
Spread spectrum may be enabled by connecting the SPREAD pin to Vdd via a pull-up resistor, or disabled by
connecting to Vss via a pull-down resistor.
AT42QT2100 [DATASHEET]
9554E–AT42–01/13
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AT42QT2100.PDF ] | |
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