CY8C20110_12 CYPRESS [Cypress Semiconductor], CY8C20110_12 Datasheet - Page 19

• Manufacturer Part Number: CY8C20110_12
• Manufacturer: CYPRESS [Cypress Semiconductor]

Table 2. Recommended Layout Guidelines and Best Practices (continued)
The recommended maximum overlay thickness is 5 mm (with external CSInt)/ 2 mm (without external CSInt). For more details refer
to the section “The Integrating Capacitor (Cint)” in AN53490.
Note Some device packages does not have CSInt pin and external capacitor cannot be connected.
Document Number: 001-54606 Rev. *G
9
10
11
12
13
14
15
16
17
18
19
20
21
S. No.
Trace routing
Via position for the sensors
Via hole size for sensor traces
Number of vias on sensor trace
CapSense series resistor
placement
Distance between any CapSense
trace to ground flood
Device placement
Placement of components in
2-layer PCB
Placement of components in
4-layer PCB
Overlay material
Overlay adhesives
LED back lighting
Board thickness
Category
10-mil
Min
–
–
–
1
–
–
–
–
–
–
–
–
10 mm
20-mil
Max
–
–
–
2
–
–
–
–
–
–
–
Via should be placed near the edge of the button/slider to
Standard board thickness for CapSense FR4 based designs is
Traces should be routed on the non sensor side. If any non
CapSense trace crosses CapSense trace, ensure that
intersection is orthogonal.
reduce trace length thereby increasing sensitivity.
10-mil
1
Place CapSense series resistors close to PSoC for noise
suppression. CapSense resistors have highest priority place
them first.
20-mil
Mount the device on the layer opposite to sensor. The
CapSense trace length between the device and sensors should
be minimum
Top layer – sensor pads and
bottom layer – PSoC, other components, and traces.
Top layer – sensor pads,
second layer – CapSense traces,
third layer – hatched ground,
bottom layer – PSoC, other components, and non CapSense
traces
Should to be non conductive material. Glass, ABS plastic,
Formica
Adhesive should be non conductive and dielectrically
homogenous. 467MP and 468MP adhesives made by 3M are
recommended.
Cut a hole in the sensor pad and use rear mountable LEDs.
Refer the PCB layout below.
1.6 mm.
Recommendations/Remarks
CY8C20160, CY8C20140
CY8C20110, CY8C20180
CY8C20142
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