IC FOR PROXIMITY DETECTOR AM 313 GENERAL DESCRIPTION The AM 313 is a bipolar monolithic Integrated Circuit designed for proximity detection applications. 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 VCC CABT 14 5 Power-On Level VREF RK LC RD RH 7 Voltage Reference Power-On Delay Short-Circuit Detection 2 1 Oscillator Schmitt Trigger Rectifier 10 Output Stages Amplifier 9 16 15 Drive Current Hysteresis 11 8 RM Q Q RS LED 4 CGL 3 LED 6 GND Figure 1 analog microelectronics Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Internet: www.analogmicro.de Phone: +49 (0)6131/91 073 – 0 Fax: +49 (0)6131/91 073 – 30 E–Mail: [email protected] April 2005 1/4 IC FOR PROXIMITY DETECTOR AM 313 ELECTRICAL SPECIFICATIONS Tamb = 25°C, VCC = 4.75 to 35 V Parameter Supply Current Symbol ICC Conditions Min. Typ. Max. Unit VCC = 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 Low Output Voltage UQL Iext = 100 µA 0.6 0.9 High Output Voltage UQ (res. UQ) VCgl = 2V, VCC = 4.75V 4.45 LED Output Current ILED Short Circuit Detection Threshold Um Current Short Circuits mA 1.2 V 4.75 V 2.8 4 mA 250 300 350 mV ION VCabt = 2V, VRm = 1V 50 80 150 µA IOFF VCabt = 1V, VRm = 1V –1.7 –1.2 –0.7 µA Typ. Max. Unit TYPICAL PERFORMANCE CHARACTERISTICS VCC = 5V Parameter Scanning Duty Cycle Symbol TON (in Short Circuit Mode) TOFF TOFF /TON Power–On–Delay Tabt Conditions Min. Cabt = 0nF, Um = 1V 4 µs Cabt = 1nF, Um = 1V 21 µs Cabt = 0nF, Um = 1V 350 µs Cabt = 1nF, Um = 1V 2.0 ms Cabt = 0nF 90 Cabt = 1nF 100 Cabt = 0nF 380 µs Cabt = 1nF 2.3 ms Oscillator Frequency fOsc depends on LC res. 0.05 Oscillator Amplitude VOsc Detection Frequency fdet Detection Distance Res. Rd Hysteresis Resistor Rh Rh >> Rd Det. Distance Temp. Comp. Res. Rk external 0 Rectifier Filter Capacitor Cglext depends on fOsc (Cglint = 150pF) 0 1.2 (fOsc = 770kHz, Q = 16) 2.6 MHz 2 Vpp 5 kHz 3 analog microelectronics kΩ 30 kΩ 1.4 150 kΩ pF April 2005 2/4 IC FOR PROXIMITY DETECTOR AM 313 ABSOLUTE MAXIMUM RATINGS Supply Voltage VCC Output Voltage UQ Output Current IQL Junction Temperature TJ Power Dissipation at Tamb = 25°C Derate for Tamb > 25°C Storage Temperature Range Tst Operating Temperature Range Tamb Tamb 35V 32V 20mA 150°C PD = 600mW 1/RΘ = 5mW/°C – 55...125°C – 25...85°C (VCC = 15V to 35V) – 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 VCC VREF 14 7 VCC 3 Rm LED Z2 11 RK 2 AM313 1 10 RH 9 15 L 16 COSC 6 5 4 8 RD Q T D1 Output Q Z1 RS D2 C R Ground Figure 2 analog microelectronics April 2005 3/4 IC FOR PROXIMITY DETECTOR AM 313 PINOUT PIN NAME DESIGNATION 1 LC Resonator Input 2 RK Detection Distance Temp. Comp. LC 1 16 RD 3 LED LED Driver RK 2 15 RH 4 CGL Rectifier Filter Capacitor LED 3 14 VCC 5 CABT Power–On–Delay Adjust Cap. CGL 4 13 NC 6 GND Ground CABT 5 12 NC 7 VREF Reference Voltage Output GND 6 RS Output Transistor Current Adjust 11 RM 8 VREF 7 10 Q 9 Q Output Q (open switch) RS 8 9 Q 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 Figure 1 DELIVERY The AM 313 is available in version: • 16–pin–DIL packages (samples) • SO 16 (n)–packages • dice on 5“ blue foil analog microelectronics April 2005 4/4