STEVAL-IFS007V1

STEVAL-IFS007V1 Distributed proximity sensor demonstration board based on the TDA0161 Data Brief Features ■ 4 TDA0161 proximity detectors capable of detecting the current losses in the passive coils connected to the board ■ Each sensor supplied by a 24 V industrial type connector Description The STEVAL-IFS007V1 demonstration board is designed for easy connection to 24 V systems, as it is intended for use in factory automation environments. Optionally, the board can be connected to the STEVAL-IFP008V1 board, which hosts a current limited over-voltage protected quad digital termination. STEVAL-IFS007V1 functionality, please refer to the TDA0161 device datasheet. The STEVAL-IFS007V1 can be used as a standalone in systems where no processing or control characteristics are required, or it can be integrated as an end-board in control systems. In the latter case an interface board, such as the above mentioned STEVAL-IFP008V1, is necessary to protect the microcontroller and other application-specific devices from high current and voltages outside of specifications. When the board is used as a standalone, it is possible to connect up to 4 different, independent coils, each of which acts as the passive element to sense an incoming metallic object by sensing variations in high frequency eddy current losses. In terms of output voltage, the variation is between approximately 8.5 V and 11.5 V in 24 V supplied systems, so the output span is approximately 3 V. On-board jumpers can be used to enable/disable channels. LEDs on the board furnish local alerts when an object is close to one coil. The circuit parameters are tuned to detect metallic objects at a distance of up to 4 mm. For further details on parameter tuning and circuit and device July 2008 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 Block diagram STEVAL-IFS007V1 1 Block diagram Figure 1. Proximity sensors PROXY_ 1 D1 R18 R1 15 KΩ R2 12 KΩ J1 1 2 C9 3.3 kΩ U1 1 VCC C* 8 2 Adj DetE 7 3 6 4 DHP Ou t 5 Adj Filt TDA0161 C2 C1 470 pF 1 nF R9 470 pF IN1 PROXY_ 2 D2 CON2 R3 15 KΩ R4 12 KΩ R17 C10 3.3 kΩ U2 1 VCC C* 2 Adj 3 DHP DetE Ou t 4 Filt Adj TDA0161 C3 C4 8 7 6 5 1 nF R12 560 R11 120 Ω IN2 PROXY_ 3 J2 1 2 3 4 5 6 CON6 R19 IN3 C11 R5 15 KΩ R6 12 KΩ U4 1 VCC C* 8 2 Adj DetE 7 3 6 4 DHP Ou t 5 Adj Filt TDA0161 C5 C6 470 pF J4 1 2 3.3 kΩ 1 nF R14 Q3 7 BC337 560 Ω R13 120 Ω 470 pF IN4 J6 1 2 CON2 VCC 24 V SM 6T12A-DT D9 3 PROXY_4 CON2 1 D8 R20 C12 R7 15 KΩ R8 12 KΩ 2/4 VCC 24 V D3 CON2 CON2 Q2 BC337 470 pF 470 pF J3 1 2 J5 1 2 Q1 BC337 560 Ω R10 120 Ω U5 1 VCC C* 2 Adj DetE 3 4 DHP Ou t Adj Filt TDA0161 C8 C7 470 pF 8 7 6 5 470 pF 1 nF 3.3 kΩ R15 560 Q4 BC 337 2 JP1 1 2 2 2 JP2 JP3 JP4 1 1 1 R16 120 Ω PROXY_1 PROXY_3 PROXY_ 2 PROXY_ 4 APM0024 STEVAL-IFS007V1 2 Revision history Revision history Table 1. Document revision history Date Revision 07-Jul-2008 1 Changes Initial release. 3/4 STEVAL-IFS007V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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