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HT672A Datasheet(PDF) 1 Page - Holtek Semiconductor Inc |
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HT672A Datasheet(HTML) 1 Page - Holtek Semiconductor Inc |
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1 / 8 page  HT672A 13.56MHz RFID Transponder Block Diagram Rev. 1.10 1 May 17, 2007 Features · Low low operating current (15mA@VDD=2V) · Wide range operating voltage · Battery less RF transponder · Data transmission in read-only operation · Max. of 64-bits customer programmable data · 16-bits CRC error detection code · OTP data memory · 13.56MHz carrier frequency · Output data baud rate: 5kbps (Typ.) · PWM/ASK modulation · Built-in voltage limiter · 8-pin DIP package available for engineering evaluation - not for volume production Applications · Interactive toys · Security system · Access control · Anti-counterfeit for commercial product General Description The HT672A is an RF transponder IC with 13.56MHz RF carrier, which provides a low cost battery less tran- sponder solution when combined with an external in- ductor. The inductor and internal capacitor form an LC tank which induce voltage from the radiated 13.56MHz carrier signal generated from the reader antenna. HT672A 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 re- sponse signal (pre-programmed in the OTP memory) is serially transmitted out. The response data is transmit- ted using PWM/ASK modulation. Modulation of 13.56MHz is accomplished by damping the LC tank with a fixed baud rate. The transmission information is stored in a 96 bits one time programmable memory OTP, with a 16-bit CRC code (up to 64 bits reserved for customer). The effective detection range for a small sized antenna is 2cm~10cm which is dependent on antenna format & reader design. The larger the antenna loop used the longer the detec- tion range. It is advisable to use larger antenna to attain a 15 cm detection range. Implementing Holtek ¢s advanced OTP and low power technology, HT672A offers a very cost effective solution for RF contact less detection system. A code area of 64-bits (max.) wide is provided so cus- tomers can program the device using the specified pro- grammer supplied by Holtek. The pre-programmed ICs are also available upon customer ¢s request. V P A C L K H F 2 H F 1 V D D V S S P W M / A S K M o d u l a t o r S h i f t R e g i s t e r D a t a E P R O M S y s t e m C l o c k G e n e r a t o r V C C L i m i t e r a n d R F L i m i t e r D a t a P r o c e s s i n g P o w e r O N R e s e t T e s t a n d E P R O M P r o g r a m m i n g C o n t r o l F r e q u e n c y D r i v e r f S Y S / 4 |
Similar Part No. - HT672A_07 |
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Similar Description - HT672A_07 |
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