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EM4069A5WW11E Datasheet(PDF) 5 Page - EM Microelectronic - MARIN SA |
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EM4069A5WW11E Datasheet(HTML) 5 Page - EM Microelectronic - MARIN SA |
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5 / 15 page  EM4069 EM4169 Copyright 2003, EM Microelectronic-Marin SA 5 www.emmicroelectronic.com EM4069 Modes of operation Sync-Pattern INIT EEPROM Read Mode Command State RF-field detected IDLE Reset Command Command finished Fig. 5 Read Mode The EM4069 holds 128 bits of user EEPROM. These 128 bits are cyclically read out by default. Using the write command, the EEPROM words can be modified. The EEPROM contains an additional configuration word used to protect writing in the EEPROM The EM4069 additionally holds a unique 64 bit read only identification code, which can be accessed by using the Read ROM command. Manchester encoding One bit period lasts 64 (or 32) field frequency periods (512 (or 256) µs at 125 kHz). The Manchester coding shows a transition from ON to OFF or from OFF to ON in the middle of bit period. At the transition from logic bit “1” to logic bit “0” or logic bit “0” to logic bit “1” the phase change. Value "high" of data stream presented below represents modulator switch OFF, "low" represents switch ON (see figure 6a). Bi-phase encoding One bit period lasts 64 (or 32) field frequency periods (512 (or 256) µs at 125 kHz). The BI-phase coding shows a transition from ON to OFF or from OFF to ON in the middle of a bit period when the data bit is a logical “0”. A logical bit set to “1” will keep its ON or OFF state for the whole bit period. There is always a transition from ON to OFF or from OFF to ON at the beginning of a bit period. The picture below shows part of a data stream. Value “high” of data stream represents modulator load OFF, “low” represents modulator load ON (see figure 6b). Manchester encoding X 1 1 1 1 1 1 1 1 1 0 1 0 1 0 0 0 1 1 0 Binary data Memory output Modulator control Modulation control “low” means high current Fig. 6a Bi-phase encoding 0 1 10 10 0 1 Modulation control “low” means high current Binary data Memory output Modulator control Fig. 6b |
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