AM313 datasheet(3/4 Pages) AME

3 / 4 page

IC FOR PROXIMITY DETECTOR

AM 313

analog microelectronics

April 2005

3/4

ABSOLUTE MAXIMUM RATINGS

Supply Voltage VCC

35V

Output Voltage UQ

32V

Output Current IQL

20mA

Junction Temperature TJ

150°C

Power Dissipation at Tamb = 25°C

PD = 600mW

Derate for Tamb > 25°C

1/RΘ = 5mW/°C

Storage Temperature Range Tst

– 55...125°C

Operating Temperature Range Tamb

– 25...85°C (VCC = 15V to 35V)

Tamb

– 20...85°C (VCC = 4.75V to 35V)

FUNCTIONAL DESCRIPTION

The proximity detection is based on the amplitude attenuation of an LC–oscillator which depends

on the distance to a metal object.

The signal from the oscillator is rectified and filtered, then detected by a Schmitt–Trigger which

switches the outputs Q (for close switch operation) and Q (for open switch operation).

An additional LED output shows the on-state of the detection. The LED is blanked in the case of

short circuit. To protect the circuit from overload, the outputs are disconnected and retested

periodically. The limitation of the output current is set by the resistor Rm.

The temperature compensation to adapt the oscillator voltage to different types of external LC

resonators is performed by connecting a resistor between pins 7 (VREF) and 2 (RK).

The circuit has a power–on–delay which is adjusted with CABT. Within this delay, the outputs Q

and Q are set to high level.

FUNCTIONAL DIAGRAMS

AM313

VREF

VCC

LED

Output

Ground

OSC

Figure 2

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