TDA0161 Proximity Detectors Features ■ 10mA Output Current ■ Oscillator Frequency 10MHz ■ Supply Voltage +4 to +35V Description These monolithic integrated circuits are designed for metallic body detection by sensing variations in high frequency Eddy current losses. Using an externally-tuned circuit, they act as oscillators. The output signal level is altered by an approaching metallic object. The output signal is determined by supply current changes. Independent of supply voltage, this current is high or low, according to the presence or absence of a closely located metallic object. DIP-8 SO8 Block Diagram October 2005 Rev 2 1/12 www.st.com 12 TDA0161 Contents 1 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Operating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Typical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Package Mechanical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2/12 TDA0161 1 Figure 1. 1 Connections Connections Pin Connections (top view) 3/12 TDA0161 2 Electrical ratings 2 Electrical ratings Table 1. Absolute maximum ratings Symbol VCC Supply Voltage TJ Operating Temperature Range TSTG 2.1 Parameter Storage Temperature Range Value Unit 35 V +150 °C –55 to 150 °C Electrical characteristics –40 < TA < +100°C, PTOT < 150mW, unless otherwise specified. Table 2. Symbol VCC Electrical Characteristcs Parameter Test conditions Supply Voltage Min. 4 Reverse Voltage Limitation ICC = –100mA Max. Unit 35 V -1 8 10 V 12 mA 1 mA ICC Supply Current close target TA = +25°C +4V < V CC < +35V ICC Supply Current remote target +4V < V CC < +35V Supply Current transition time C3 = 0 1 µs C3 ≠ 0 100 x C3 (nF) µs fOSC Oscillator Tuning Frequency fO Output Frequency C3 = 0 Output Current Ripple C3 = 0, C2 (pF) > 150/fOSC(MHz) Negative Resistance on Terminals A and E 4kΩ < R1 < 50kΩ, fOSC < 3MHz Hysteresis at Detection Point C2 (pF) > 150/fOSC(MHz) ∆ICC Rn HYST 4/12 Typ. 0 0.9 R1 0.5 R1 10 MHz 10 kHz 20 µA 1.1 R1 5 % TDA0161 3 3 Operating Mode Operating Mode Between pins 3 and 7, the integrated circuit acts like a negative resistor with a value equal to that of the external resistor R1 (connected between pins 2 and 4). The oscillation stops when the tuned circuit loss resistance (Rp) becomes smaller than R1. As a result, ICC(close) = 10mA (pins 1 and 6). The oscillation is sustained when Rp is higher than R1, and ICC(remote) = 1mA (pins 1 and 6). Eddy currents induced by coil L1 in a metallic body determine the value of Rp. Figure 2. Electrical Scheme Icc(close) Icc(remote) If the circuit is used at frequency higher than 3MHz, it is recommended to connect a capacitor of 100pF between pins 7 and 6 5/12 TDA0161 4 Typical Applications 4 Typical Applications Figure 3. Application Interface Connection Diagram Table 3. Detection Range Detection Range (#) L1 (µH) C1 (pF) fOSC (kHz) R1 (kΩ) C2 (pF) 2mm 30 (1) 120 2650 6.8 47 5mm 300 (2) 470 425 27 470 10mm 2160 (3) 4700 50 27 3300 Table 4. Coil Characteristics Core Coil Former 1 Cofelec 432 FP 9 x 5 SE 1/2 Car 091 - 2 2 Cofelec 432 FP 14 x 8 SE 1/2 Car 142 - 2 3 Cofelec 432 FP 26x 16 SE 1/2 Car 262 - 2 Wire (##) THOMSON Fils et Câbles Thomrex 14 (14 / 100mm) Number of Turns 40 100 200 #) _.Ingot steel target ##).The above results are obtained with single wire coil. When using Litz wire instead of single wire, the parallel resistance of the coil becomes higher and value of R1 may be increased, resulting in better sensitivity 6/12 TDA0161 4 Typical Applications 4.1 ___Typical Application Example Figure 4. __Detection distance 7/12 TDA0161 5 Package Mechanical Data 5 Package Mechanical Data Plastic DIP-8 MECHANICAL DATA mm DIM. MIN. A TYP. inch MAX. MIN. 3.3 TYP. MAX. 0.130 a1 0.7 B 1.39 1.65 0.055 0.065 B1 0.91 1.04 0.036 0.041 b b1 0.028 0.5 0.38 0.020 0.5 D 0.015 0.020 9.8 0.386 E 8.8 0.346 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 7.1 0.280 I 4.8 0.189 L Z 3.3 0.44 0.130 1.6 0.017 0.063 P001F 8/12 TDA0161 5 Package Mechanical Data SO-8 MECHANICAL DATA DIM. mm. MIN. TYP A a1 MIN. TYP. 1.75 0.1 MAX. 0.068 0.25 a2 a3 inch MAX. 0.003 0.009 1.65 0.064 0.65 0.85 0.025 0.033 0.018 b 0.35 0.48 0.013 b1 0.19 0.25 0.007 0.010 C 0.25 0.5 0.010 0.019 0.196 c1 45 (typ.) D 4.8 5.0 0.188 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 3.81 0.150 F 3.8 4.0 0.14 L 0.4 1.27 0.015 M S 0.6 0.157 0.050 0.023 8 (max.) 9/12 TDA0161 6 Order codes Part number Temp range Package Packing TDA0161DP 150°C DIP-8 Tube TDA0161FP 150°C SO8 Tube TDA0161FPT 150°C SO8 Tape and Reel 10/12 TDA0161 7 7 Revision history Revision history Date Revision Changes 06-Jan-2003 1 Initial release. 12-Oct-2005 2 Final release. 11/12 TDA0161 7 Revision history Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners © 2005 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 12/12