AM313 AME | Alldatasheet

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IC FOR PROXIMITY DETECTOR AM 313 analog microelectronics April 2005 Analog Microelectronics GmbH P hone: +49 (0)6131/91 073 – 0 1/4 An der Fahrt 13, D – 55124 Mainz Fax: +49 (0)6131/91 073 – 30 Internet: www.analogmicro.de E–Mail: info@analogmicro .de GENERAL DESCRIPTION The AM 313 is a bipolar monolithic Integrated Circuit designed for proximity detection appli- cations. The function is based on the damping of an LC oscillator which switches a transistor and LED output.

FEATURES

  • Wide Supply Voltage Range from 4.75 to 35V
  • Supply Current Without Oscillator typical 1mA
  • Complementary Outputs with Short–Circuit Protection
  • P–Type Drivers for PNP Bipolar and PMOS Transistors
  • Adjustable Output Current From 100µA to 12mA
  • Adjustable Detection Distance and Hysteresis
  • Adjustable Temperature Compensation for Detection Distance
  • Protection against False Polarity
  • Power–On–Delay
  • LED Output 4mA typical BLOCK DIAGRAM 14 5 4 3 6 Oscillator Rectifier Hysteresis Power-On Level Vol ta ge Reference Schmitt Trigger Power-On Delay Amplifier Short-Circuit Detection Output Stages Drive Current LED VREF RK LC RD RH CGL LED GND RS Q RM CABTVCC Q Figure 1

IC FOR PROXIMITY DETECTOR AM 313 analog microelectronics April 2005 ELECTRICAL SPECIFICATIONS Tamb = 25°C, VCC = 4.75 to 35 V Parameter Symbol Conditions Min. Typ. Max. Unit Supply Current ICC V CC = 4.75V, IRd = 0µA 0.6 0.9 1.2 mA VCC = 4.75V, IRd = 220µA 1.2 1.5 1.8 mA VCC = 35V, IRd = 0µA 0.8 1.1 1.5 mA Output Source Current IQL (res. IQ) VCabt = 2V, VCC = 35V 100 150 200 µA Output Sink Current IQL without external RS 100 150 200 µA Max. Current IQL = f (RS) RS = 5Ω 12 18 mA Low Output Voltage UQL Iext = 100 µA 0.6 0.9 1.2 V High Output Voltage UQ (res. UQ) VCgl = 2V, VCC = 4.75V 4.45 4.75 V LED Output Current ILED 2.8 4 mA Short Circuit Detection Threshold Um 250 300 350 mV Current Short Circuits ION V Cabt = 2V, VRm = 1V 50 80 150 µA IOFF V Cabt = 1V, VRm = 1V –1.7 –1.2 –0.7 µA TYPICAL PERFORMANCE CHARACTERISTICS VCC = 5V Parameter Symbol Conditions Min. Typ. Max. Unit Scanning Duty Cycle TON C abt = 0nF, Um = 1V 4 µs (in Short Circuit Mode) C abt = 1nF, Um = 1V 21 µs TOFF C abt = 0nF, Um = 1V 350 µs C abt = 1nF, Um = 1V 2.0 ms TOFF /TON C abt = 0nF 90 C abt = 1nF 100 Power–On–Delay Tabt C abt = 0nF 380 µs C abt = 1nF 2.3 ms Oscillator Frequency fOsc depends on LC res. 0.05 2.6 MHz Oscillator Amplitude V Osc 1.2 2 Vpp Detection Frequency fdet (fOsc = 770kHz, Q = 16) 5 kHz Detection Distance Res. Rd 3 kΩ Hysteresis Resistor Rh R h >> Rd 30 kΩ Rectifier Filter Capacitor Cglext depends on fOsc (Cglint = 150pF) 0 150 pF

IC FOR PROXIMITY DETECTOR AM 313 analog microelectronics April 2005 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 th e detection. The LED is blanked in the case of short circuit. To protect the circuit from ove rload, 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 oscillato r 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 AM3131 456 VREF VCC LED Rm Q Q T C R VCC Output Ground RS RD RH RK COSC L Figure 2

IC FOR PROXIMITY DETECTOR AM 313 analog microelectronics April 2005 PINOUT PIN NAME DESIGNATION

1 LC Resonator Input

2 RK Detection Distance Temp. Comp.

3 LED LED Driver

4 CGL Rectifier Filter Capacitor

5 CABT Power–On–Delay Adjust Cap.

6 GND Ground

7 VREF Reference Voltage Output

8 RS Output Transistor Current Adjust

9 Q Output Q (open switch)

10 Q Output Q (closed switch)

11 RM Short Circuit Detection Input

12 NC Not Connected

13 NC Not Connected

14 VCC Positive Supply Voltage

15 RH Hysteresis Adjust

16 RD Detection Distance Adjust

The AM 313 is available in version:

  • 16–pin–DIL packages (samples)
  • SO 16 (n)–packages
  • dice on 5“ blue foil 8 9 LC RK LED CGL CABT GND VREF RS RD RH VCC NC NC RM Q Q Figure 1