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MC33690 bảng dữ liệu(PDF) 5 Page - Freescale Semiconductor, Inc |
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MC33690 bảng dữ liệu(HTML) 5 Page - Freescale Semiconductor, Inc |
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5 / 24 page  MOTOROLA SEMICONDUCTORS PRODUCTS 5 revision 4.8, 5 February 2002 © Motorola, Inc., 2002. MC33690 DESCRIPTION TAG READER MODULE The Tag Reader module is dedicated for automotive or industrial applications where information has to be transmitted contactless. The tag reader module is a write/read (challenge/ response) controller for applications which demand high security level. The tag reader module is connected to a serial tuned LC circuit which generates a magnetic field power supplying the tag. The use of a synchronous sample & hold technique allows communication with all avalaible tags using admittance switching producing absorption of the RF field. Load amplitude or phase shift modulation can be detected at high bit rates up to 8kHz. 125kHz is the typical operational carrier frequency of the tag reader module with a 8MHz clock. Figure 2 : Tag Reader block diagram D C Q + - 1/32 counter 1/2 RD CEXT AGND Buffer VDD 500ns S/H Buffer Comparator 100K Ω 8MHz Clock 8MHz Data out Interface 125kHz TD2 11.25° , 22.5° , 33.75° , 45° , 56.25° , 67.5° , 78.75° , 90° AM Data 4MHz 125kHz LVR Shutdown TD1 10nF + 0°, -11.25°, -22.5°, -33.75°, -45°, -56.25°, -67.5°, -78.75° CA LA R1 R2 CEXT RA VDD + - Setup & Preload Self synchronous sample & hold 500 µA Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
Số phần tương tự - MC33690 |
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Mô tả tương tự - MC33690 |
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