This new Texas Instruments component consists of an inductive proximity detector that can be used in a multitude of applications. See this article what he does.
The basic idea of this new component of Texas Instruments is detect conductive objects when they approach. The circuit as shown in Figure 1 has two coils which allow detection by modifying the object cause in the signal coupled.
The circuit triggers when a conductive object approaches the sensor coil. A hysteresis is added to obtain a threshold trigger which prevents erratic triggering of the circuit which may be caused by mechanical vibration.
One advantage of the system's immunity to dirt, oil, dust and other elements in a tougher environment.
An advantage of this sensor is that it does not require the use of magnets and is not affected by constant magnetic fields.
The device operates with voltages from 1.8 V to 3.3 V and requires a current less than 20 µA with a shutdown of 140 nA.
The activation threshold is programmed via a resistor and the reading rate is ksps.
Among the suggested applications include:
- Security building
- Printers
- Event Count
- Encoders
- Flowmeters
- Keyboards
- Industrial proximity switch
The full datasheet of this component can be downloaded at:
http://www.ti.com/lit/ds/symlink/ldc0851.pdf
