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EM4169A6WP7 Datasheet(PDF) 4 Page - EM Microelectronic - MARIN SA |
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EM4169A6WP7 Datasheet(HTML) 4 Page - EM Microelectronic - MARIN SA |
4 / 15 page EM4069 EM4169 Copyright 2003, EM Microelectronic-Marin SA 4 www.emmicroelectronic.com Functional Description The IC builds its power supply through an integrated rectifier. When it is placed in a magnetic field the DC internal voltage starts to increase. As long the power supply is lower than the power on reset (POR) threshold, the circuit is in reset mode to prevent unreliable operation. In this mode the modulator switch is off. After the supply voltage cross the POR threshold, the circuit goes in read mode and transmits periodically the 128 data bits from EEPROM. The power on reset is designed with a typically 250mV hysteresis. The specified value in the DC electrical characteristic table indicates the high level-switching threshold. Ones the supply voltage had reached this level, the device work in read mode and reenter in reset mode if the supply voltage decrease under the lower threshold (~VPOR – 250mV). In read mode the IC transmits periodically either the 128 data bits from EEPROM or 64 data bits from ROM if command 2 has been sent. The bits are Manchester or BI- phase coded and issued by switching the modulator load in parallel to the coil ON and OFF. The read out process is repeated continuously without any pause as long as power level is greater than the POR threshold low. While the IC is operating in read mode it checks the coil signal once every bit period. If it detects a certain reader induced amplitude modulation of magnetic field it stops modulating and waits for a command word. In the case the EEPROM write command is detected the contents of selected EEPROM word is modified. Read ROM command will change the output sequence to the data provided by the laser ROM continuously. The Reset command returns to the initial mode as after a Power on Reset. Block description Power On Reset (POR) When the EM4069 with its attached coil enters an electromagnetic field, the built in AC/DC converter will supply the chip. The DC voltage is monitored and a Reset signal is generated to initialise the logic. The Power On Reset is also provided in order to make sure that the chip will start issuing correct data. Hysteresis is provided to avoid improper operation at the limit level. VPOR t Reset VDD t Hysteresis P4069 Active Fig. 4 Clock Extractor The Clock extractor will generate a system clock with a frequency corresponding to the frequency of the RF field. The system clock is used by a sequencer to generate all internal timings. Data Extractor The transceiver generated field will be amplitude modulated to transmit data to the EM4069. The Data extractor demodulates the incoming signal to generate logic levels, and decodes the incoming data. Modulator The Data Modulator is driven by the serial data output from the transceiver. The modulator will draw a large current from both coil terminals, thus amplitude modulating the RF field according to the selected memory data. AC/DC Converter and Voltage Limiter The AC/DC converter is fully integrated on chip and will extract the power from the incident RF field. The internal DC voltage will be clamped to avoid high voltage in strong RF fields. Lock All / Lock Memory Area The EM4069 can be converted to a Read Only chip or be configured to Read/Write and Read Only Areas by programming the protection word. This configuration can be locked by write inhibiting the Write Protection Word. Great care should be taken in doing this operation as there is no further possibility to change the Write Protection Word. The Control Word can also be protected in the same way thus freezing the writing operation. EM4069 Active |
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