Microchip Technology DM160218 Data Sheet
MGC3130
DS40001667C-page 12
Advance Information
2012-2013 Microchip Technology Inc.
3.3.2
STANDARD ELECTRODE DESIGN
The MGC3130 electrode system is typically a double-
layer design with a Tx transmit electrode at the bottom
layer to shield against device ground and thus, ensure
high receive sensitivity. Up to five comparably smaller
Rx electrodes are placed above the Tx layer providing
the spatial resolution of the GestIC system. Tx and Rx
layer design with a Tx transmit electrode at the bottom
layer to shield against device ground and thus, ensure
high receive sensitivity. Up to five comparably smaller
Rx electrodes are placed above the Tx layer providing
the spatial resolution of the GestIC system. Tx and Rx
are separated by a thin isolating layer. The Rx
electrodes are typically arranged in a frame
configuration as shown in
electrodes are typically arranged in a frame
configuration as shown in
. The frame
defines the inside sensing area with maximum
dimensions of 14x14 centimeters. An optional fifth
electrode in the center of the frame may be used to
improve the distance measurement and add simple
touch functionality.
The electrodes’ shapes can be designed solid or
structured. In addition to the distance and the material
between the Rx and Tx electrodes, the shape structure
density also controls the capacitance C
dimensions of 14x14 centimeters. An optional fifth
electrode in the center of the frame may be used to
improve the distance measurement and add simple
touch functionality.
The electrodes’ shapes can be designed solid or
structured. In addition to the distance and the material
between the Rx and Tx electrodes, the shape structure
density also controls the capacitance C
R
X
T
X
and thus,
the sensitivity of the system.
FIGURE 3-3:
FRAME SHAPE ELECTRODES
Note:
Ideal designs have low C
RxTx
and C
RxG
to
ensure higher sensitivity of the electrode
system. Optimal results are achieved with
C
system. Optimal results are achieved with
C
RxTx
and C
RxG
values being in the same
range.
South
West
East
Center
North
Top Layer (Lateral Rx)
Top Layer (Center Rx)
Tx Layer