PDF HT672B Data sheet ( Hoja de datos )

Número de pieza	HT672B
Descripción	13.56MHz RFID Transponder
Fabricantes	Holtek Semiconductor
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No Preview Available ! HT672B 13.56MHz RFID Transponder www.DataSheet4U.com Features · Wide range operating voltage · Batteryless RF transponder · Data transmission in read-only operation · 6-bits sync + 32-bits data + 8-bits CRC · OTP data memory · 13.56MHz carrier frequency · Output data baud rate: 10kbps at VDD=3V · PWM/ASK modulation · Built-in voltage limiter · 8-pin DIP package Applications · Interactive leisure products · Security system · Access control · Anti-counterfeit devices · Material management · Animal management · Personnel working time record · Car park monitoring system General Description The HT672B is a RF transponder IC operating with 13.56MHz RF carrier, which provides a low cost batteryless transponder solution with the addition of merely an external inductor. The inductor and internal capacitor form a LC tank which inducing voltage from the radiated 13.56MHz carrier signal generated from the reader antenna. HT672B 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 serial transmitted out. The response data is transmitted 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 40 bits. One Time Programmable memory (OTP) (up to 32 bits re- served for customer) in the chip, with a 8-bits checksum code. The effective detection range for a small sized an- tenna is 2cm~10cm which is dependent on antenna for- mat & reader design. The larger the antenna loop used the longer the detection range. It is advisable to use larger antenna to attain a 15cm detection range. Imple- menting Holtek¢s advanced OTP and low power tech- nology, HT672B offers a very cost effective solution for RF contactless detection system. A code area of 32-bits(max.) wide is provided so customers can pro- gram the device using the specified programmer sup- plied by Holtek. The pre-programmed Ics are also available upon customer¢s request. Block Diagram HF H F1 S y s te m C lo c k G e n e ra to r V C C L im ite r and R F L im ite r F re q u e n c y D r iv e r f/4 D a ta P r o c e s s in g P W M /A S K M o d u la to r S h ift R e g is te r D a ta T e s t B lo c k V P P C LK VDD VSS Rev. 1.10 1 November 23, 2004 1 page 1-chip Solution (I) H o lte k T r a n s p o n d e r S o lu tio n www.DataSheet4U.com E n e rg y H T672B ANT D a ta HT672B H o lte k R e a d e r S o lu tio n R F osc ANT & R e c e iv e r D a ta D ecode & S y s te m C o n tro l F u n c tio n C o n tro l 1-chip Solution (II) H o lte k T r a n s p o n d e r S o lu tio n E n e rg y H T672B ANT D a ta H o lte k S ta n d a r d M C U : H T 4 8 X X X /H T 4 9 X X X H o lte k R e a d e r S o lu tio n ANT R F osc & R e c e iv e r D a ta D ecode & S y s te m C o n tro l F u n c tio n C o n tro l D a ta , V o ic e orLC D D is p la y P r o c e s s in g H o lte k E m b e d d e d M C U : H T G 2 1 X X /H T 8 6 X X X Rev. 1.10 5 November 23, 2004 5 Page

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