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EM4006F9WW7 Datasheet(PDF) 5 Page - EM Microelectronic - MARIN SA |
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EM4006F9WW7 Datasheet(HTML) 5 Page - EM Microelectronic - MARIN SA |
5 / 10 page EM4006 Copyright 2001, EM Microelectronic-Marin SA 5 www.emmicroelectronic.com Factory reserved bits These 9 bits are reserved. Default value is 00Bhex. IC name bits They contains the 3 last characters device name. For this device, the value is 006hex. Customer ID bits This field contains a code which is defined by EM Microelectronic-Marin S.A. For standard version, the code is 0001hex. ID code bits This field is programmed from a counter in that way that each device is unique. Cyclic redundancy check The shift register is reset to all zero with each Stop Bit. CRC code is calculated on 64 data bits. The CRC code is calculated according to CCITT / ISO 3309 - 1984 standards. See figure 5 for principle block schematic and generating polynomial of the CRC code. Start and stop bits Start bit is set to logic 1 and stop bit is set to logic 0. CRC Block Diagram 15 14 11 12 13 4 5 6 7 8 9 10 0 1 2 3 data input BCC REGISTER SERIALQUOTIENT X16 X12 X5 FEEDBACK BEFORE SHIFT CRC-CCITT GENERATING POLYNOMIAL= X16 + X12 + X5+ X0 = BCC(Block Check Characters) REGISTER STAGE = EXCLUSIVE - OR x LSB MSB Fig. 5 RF Interface Resonant capacitor, Rectifier, Limiter and Modulator Switch form the unit which is interfacing to the incoming RF signal. These blocks are interdependent so they are developed as unit. They interface to the antenna which typical characteristics are: LS ≈ 1400 nH RS ≈ 3 Ohms 30 < Q < 40 at 13.56 MHz. Resonant Capacitor The capacitor value is adjusted by laser fusing. It can be trimmed by 1pF steps to achieve the absolute value of 94.5pF typically. This option, which is available on request, allows a smaller capacitor tolerance over the whole production. Rectifier and Limiter A full wave rectifier (Graetz Bridge) is used to provide supply voltage to the IC. The reverse breakdown of the diodes is also used to protect the IC from overvoltages. |
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