AN2679 Datasheet, PDF (1/16 Pages) STMicroelectronics – Smart inductive proximity switch

AN2679
Application note
Smart inductive proximity switch
Introduction
The STEVAL-IFS006V1 inductive proximity switch demonstration board is designed based
on the principle of metal body detection using the eddy current effect on the HF losses of a
coil. It consists of a single transistor HF oscillator, an ST7LITEUS5 microcontroller and the
TDE1708DFT intelligent power switch. The board is a compact and cost-effective solution
for an inductive proximity sensor designed for simplicity and for a wide temperature range
and supply voltage variations. Other board features include:
■ Great flexibility: the MCU firmware can be modified depending on application
requirements
■ Sensitivity and hysteresis adjustment
■ In-circuit programming and debugging capabilities
■ Analog and digital temperature compensation
■ PNP and NPN sensor functionality configurations
■ Indicator status LED
■ Overload and short-circuit protection
■ GND and Vs open wire protection
■ Compact design
■ Supply voltage: 6 V to 48 VDC
■ Temperature range: -25 °C to +85 °C
Figure 1. Smart inductive proximity switch demonstration board
July 2008
Rev 1
1/16
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