at42qt2100 ATMEL Corporation, at42qt2100 Datasheet - Page 9

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

3.4
3.5
Figure 3-2.
9554CX–AT42–11/11
MLF Package Restrictions
Slider and Wheel Construction
SNSA 3
All-Metal Slider and Wheel Construction
(Downloadable CAD files can be found on the Atmel website)
0
SNSA1
Position (at 7 bits - 0 to 127)
The central pad on the underside of the MLF chip should be connected to ground. Do not run
any tracks underneath the body of the chip, only ground.
good/bad tracking.
Figure 3-1.
The QT2100 can be connected to a linear slider element or a wheel (see
Selection of linear slider operation or a wheel is set through an SPI command.
As with touch button electrodes, sliders and wheels can be constructed as etched areas on a
PCB or flex circuit, or from clear conductors such as Indium Tin Oxide (ITO) or screenprinted
PEDOT to allow backlighting effects, or for use over an LCD display.
1 to 126
Examples of Good and Bad Tracking
Example of GOOD Tracking
SNSA 2
SNSA 3
127
Tips of triangles should be
spaced <=4mm apart.
Position 85
SNSA 2
Example of BAD Tracking
<=4mm
Figure 3-1
Position 0
SNSA 3
AT42QT2100
shows an example of
<=4mm
Figure
Position 43
SNSA 1
3-2).
9