AN4038 datasheet(30/39 Pages) STMICROELECTRONICS

поискавой системы для электроныых деталей

AN4038 датащи(PDF) 30 Page - STMicroelectronics

номер детали	AN4038

подробное описание детали	Guidelines to optimize proximity detection with STM8TL5xxx capacitive sensors

PDF	39 Pages

Scroll/Zoom	100%

производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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30 / 39 page

Front Panel

AN4038

30/39

Doc ID 022686 Rev 1

Front Panel

The front panel material and thickness influence the projected capacitance field. Each

material type is defined with a dielectric constant, known as epsilon (

εr). The higher εr is,

the easier the field can pass through material.

For example (see Figure 29), if the proximity distance without any panel is tair0, it becomes

tair1 when a panel is inserted between the sensor and the hand. tair1 is the distance between

the hand and the front panel, and Ttotal is the total distance between the hand and the

sensor. tair1 is lower than tair0 but the Ttotal is higher than tair0.

Figure 29.

Influence of panel on detection distance

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