Temperature effect

AN3150

20/25

DocID17048 Rev 3

4.3.2

Figure 15. Detection distance versus electrode form factor

Figure 15. shows that the detection distance is not influenced by the length-over-width ratio

when the whole electrode is covered with the test object. Obviously the 14.1mm x 14.1mm

rectangle electrode will be easier to cover with a human hand than the 70.7mm x 2.8mm.

For all electrode shapes, the effect of the GND plane is similar.

5

Temperature effect

The temperature is an important parameter of the environment. This parameter has an

impact on the sensor signal. The signal variation induced by the temperature drift is

considered as a slow event and is compensated by the device “Environment Compensation

System”. Please refer to the product specification for more information.

The influence of the temperature is different and specific to each system implementation. It

is mainly related to the mechanical construction of the sensing electrode and the system

gain.

5.0.1

Test description

The system is placed in an environment chambers (ESPEC PL-2K) and tested in the -40° to

+90°C temperature range.