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EM4100C4WS7E Datasheet(PDF) 4 Page - EM Microelectronic - MARIN SA |
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EM4100C4WS7E Datasheet(HTML) 4 Page - EM Microelectronic - MARIN SA |
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4 / 9 page  R EM4100 Block Diagram CLOCK EXTRACTOR FULL WAVE RECTIFIER DATA MODULATOR SEQUENCER DATA ENCODER MEMORY ARRAY Logic Clock Serial Data Out Modulation Control Cres COIL1 COIL2 AC1 AC2 + - Csup VDD VSS a a: open only for PSK version Fig. 5 Functional Description General The EM4100 is supplied by means of an electromagnetic field induced on the attached coil. The AC voltage is rectified in order to provide a DC internal supply voltage. When the last bit is sent, the chip will continue with the first bit until the power goes off. Full Wave Rectifier The AC input induced in the external coil by an incident magnetic field is rectified by a Graetz bridge. The bridge will limit the internal DC voltage to avoid malfunction in strong fields. Clock Extractor One of the coil terminals (COIL1) is used to generate the master clock for the logic function. The output of the clock extractor drives a sequencer. Sequencer The sequencer provides all necessary signals to address the memory array and to encode the serial data out. Three mask programmed encoding versions of logic are available. These three encoding types are Manchester, biphase and PSK. The bit rate for the first and the second type can be 64 or 32 periods of the field frequency. For the PSK version, the bit rate is 16. The sequencer receives its clock from the COIL1 clock extractor and generates every internal signal controlling the memory and the data encoder logic. Data Modulator The data modulator is controlled by the signal Modulation Control in order to induce a high current in the coil. In the PSK version, only COIL2 transistor drives this high current. In the other versions, both coil1 and coil2 transistors drive it to Vdd. This will affect the magnetic field according to the data stored in the memory array. Resonance Capacitor This capacitor can be trimmed in factory by 0.5pf steps to achieve the absolute value of 74pf typically. This option, which is on request, allows a smaller capacitor tolerance on the whole of the production. Copyright © 2004, EM Microelectronic-Marin SA 4 www.emmicroelectronic.com |
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