AN3150 Datasheet, PDF (17/25 Pages) Freescale Semiconductor, Inc – Soldering Recommendations for Pressure Sensor Devices

AN3150
Proximity sensing electrode design
4.2.1
test description
The dielectric thickness (T) between the electrode and GND plane varies form 0.2mm to
1.6mm (see Figure 10.).
Figure 10. Dielectric thickness
Sensing area
Epoxy
Electrode
T
T (mm) = 0.2, 0.6, 0.8, 1, 1.2, 1.4, 1.6
GND plane
MS31255V1
For each dielectric thickness, different electrode size from 50mm² to 250mm² have been
tested (see Figure 11.)
50 mm²
Figure 11. Test boards surfaces
100 mm² 150 mm²
200 mm²
250 mm²
MS31256V1
DocID17048 Rev 3
17/25
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