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Holtek offers low cost battery-less transponder solution

Posted: 26 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:holtek semiconductor? ht6740? rf transponder ic? rf?

The HT6740 from Holtek Semiconductor is an RF transponder IC with 13.56MHz RF carrier, which provides a low cost battery-less transponder solution when combined with an external inductor.

According to the company, the inductor and internal capacitor form an LC tank which induces voltage from the radiated 13.56MHz carrier signal generated from the reader antenna. In addition, the HT6740 has a built-in low power RC oscillator which is activated if the induced carrier field strength is high enough to supply the operating current and the response signal (pre-programmed in the OTP memory) is serially transmitted out. The response data is transmitted using PWM/ASK modulation, and the modulation of 13.56MHz is accomplished by damping the LC tank with a fixed baud rate.

The transmission information is stored in a 17bit one time programmable memory (OTP), with a 6bit CRC code (up to 11bits reserved for customer). The effective detection range for a small sized antenna is between 2cm and 10cm, which is dependent on antenna format and reader design, Holtek explained. The larger the antenna loop used, the longer the detection range will be. It is advisable to use larger antenna to attain a 15cm detection range, the company added.

Implementing its advanced OTP and low power technology, the HT6740 offers a cost effective solution for RF contactless detection system, and has a built-in anti-collision function. Customers can choose with anti-collision or with non anti-collision function in the program software tool supplied by Holtek.

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