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| 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 2 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 4 5 6 7 Operating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Package Mechanical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2/12 TDA0161 1 Connections 1 Figure 1. Connections Pin Connections (top view) 3/12 2 Electrical ratings TDA0161 2 Electrical ratings Table 1. Symbol VCC TJ TSTG Supply Voltage Operating Temperature Range Storage Temperature Range Absolute maximum ratings Parameter Value 35 +150 -55 to 150 Unit V C C 2.1 Electrical characteristics -40 < TA < +100C, PTOT < 150mW, unless otherwise specified. Table 2. Symbol VCC Electrical Characteristcs Parameter Supply Voltage Reverse Voltage Limitation ICC = -100mA Test conditions Min. 4 -1 8 10 12 Typ. Max. 35 Unit V V mA ICC ICC Supply Current close target TA = +25C +4V < V CC < +35V Supply Current remote target Supply Current transition time +4V < V CC < +35V C3 = 0 C3 0 1 1 100 x C3 (nF) 10 mA s s MHz kHz A fOSC fO ICC Rn HYST Oscillator Tuning Frequency Output Frequency Output Current Ripple C3 = 0 C3 = 0, C2 (pF) > 150/fOSC(MHz) 4k < R1 < 50k, fOSC < 3MHz C2 (pF) > 150/fOSC(MHz) 0 10 20 Negative Resistance on Terminals A and E Hysteresis at Detection Point 0.9 R1 0.5 R1 1.1 R1 5 % 4/12 TDA0161 3 Operating Mode 3 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 4 Typical Applications TDA0161 4 Figure 3. Typical Applications Application Interface Connection Diagram Table 3. Detection Range L1 (H) 30 (1) 300 (2) 2160 (3) C1 (pF) 120 470 4700 fOSC (kHz) 2650 425 50 R1 (k) 6.8 27 27 C2 (pF) 47 470 3300 Detection Range (#) 2mm 5mm 10mm Table 4. Coil Characteristics Core Coil Former 1/2 Car 091 - 2 1/2 Car 142 - 2 1/2 Car 262 - 2 Wire (##) THOMSON Fils et Cables Thomrex 14 (14 / 100mm) Number of Turns 40 100 200 1 2 3 Cofelec 432 FP 9 x 5 SE Cofelec 432 FP 14 x 8 SE Cofelec 432 FP 26x 16 SE #) _.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 5 Package Mechanical Data TDA0161 5 Package Mechanical Data Plastic DIP-8 MECHANICAL DATA DIM. MIN. A a1 B B1 b b1 D E e e3 e4 F I L Z 0.44 3.3 1.6 0.017 8.8 2.54 7.62 7.62 7.1 4.8 0.130 0.063 0.38 0.7 1.39 0.91 0.5 0.5 9.8 0.346 0.100 0.300 0.300 0.280 0.189 0.015 1.65 1.04 mm TYP. 3.3 0.028 0.055 0.036 0.020 0.020 0.386 0.065 0.041 MAX. MIN. inch TYP. 0.130 MAX. P001F 8/12 TDA0161 5 Package Mechanical Data SO-8 MECHANICAL DATA DIM. A a1 a2 a3 b b1 C c1 D E e e3 F L M S 3.8 0.4 4.8 5.8 1.27 3.81 4.0 1.27 0.6 8 (max.) 0.14 0.015 5.0 6.2 0.65 0.35 0.19 0.25 0.1 mm. MIN. TYP MAX. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 45 (typ.) 0.188 0.228 0.050 0.150 0.157 0.050 0.023 0.196 0.244 0.025 0.013 0.007 0.010 0.003 MIN. inch TYP. MAX. 0.068 0.009 0.064 0.033 0.018 0.010 0.019 9/12 TDA0161 6 Order codes Part number TDA0161DP TDA0161FP TDA0161FPT Temp range 150C 150C 150C Package DIP-8 SO8 SO8 Packing Tube Tube Tape and Reel 10/12 TDA0161 7 Revision history 7 Revision history Date 06-Jan-2003 12-Oct-2005 Revision 1 2 Initial release. Final release. Changes 11/12 7 Revision history TDA0161 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 (c) 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 |
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