AN2863 Datasheet, PDF (1/13 Pages) STMicroelectronics – Smart inductive proximity switch with SPT01-335DEE

AN2863
Application note
Smart inductive proximity switch with SPT01-335DEE
1
Introduction
The STEVAL-IFS006V2 demonstration board shows an inductive proximity switch 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, a ST7LITEUS5 microcontroller, an
intelligent TDE1708DFT power switch, and an SPT01-335DEE triple Transil™ array. The
board demonstrates a very simple compact and cost-effective solution of an inductive
proximity switch with regard to a wide temperature range, supply voltage variation, and
noise immunity in industrial environments.
Features
■ Metal body detection using the eddy current effect on the HF losses of a coil
■ Good flexibility: MCU firmware can be modified depending on the application
requirements - sensitivity and hysteresis adjustment
■ In-circuit programming and in-circuit debugging capabilities
■ Analog and digital temperature compensation
■ PNP (high-side) sensor functionality configuration
■ Complete Transil protection of the output and power supply lines
■ Overload and short-circuit protection
■ GND and Vs open wire protection
■ Indicator status LED
■ Compact design
■ Supply voltage: 7 V to 32 V DC
■ Temperature range: –25 °C to +85 °C.
Figure 1. Smart inductive proximity switch board
February 2011
Doc ID 15277 Rev 1
1/13
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