EM4006F9WT11 데이터 시트보기 (PDF) - EM Microelectronic - MARIN SA

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EM4006F9WT11

13.56 MHz 64 Data bit Read Only Contactless Identification Device

EM Microelectronic - MARIN SA 

General Description

The transponder will be activated when illuminated by a

RF field of sufficient power and at any frequency that is

compatible with its associated antenna and its internal

power supply circuit input characteristics. The chip will

Power-on-Reset itself when powered by this incoming

energy that exceeds its reset threshold. After resetting

itself the chip will start to transmit its memory contents as

a stream of Miller code. The memory contents is

transmitted by modifying the antenna matching

impedance at its internal clock rate, thereby causing

varying amounts of RF energy to be reflected from the

antenna. This impedance variation will be achieved by

connecting a modulating device across the antenna

terminals. When switched on the modulating device will

present a low impedance to the antenna. This will cause a

change in the matching of the antenna and therefore in

the amount of RF energy reflected by the transponder to

the reader. This reflected signal combines with the

transmitted signal in the receiver to yield an amplitude

modulated signal representative of the IC memory

contents. The “ON” impedance of the modulating device

needs to be comparable to about 100 Ohms to affect the

matching of the antenna and therefore its reflectivity.

The RF signal received from the transponder antenna will

serve several purposes :

• power the chip

• provide a global reset to the chip through its POR

(Power-On-Reset) function

• provide a carrier for the data transmission

• provide the input of the internal clock generation circuit

(frequency division)

EM4006

Functional Description

Output Sequence

Transmission from the transponder will be accomplished

through variation of the antenna load impedance by

switching the modulating device ON and OFF.

Output sequence is composed of cycles which are

repeated. Each cycle is composed of 82 bits Standard

Message Structure (STDMS) which is Miller coded and a

pause (LW) during which the modulating device is OFF

(see figure 6 for details of Miller code).

The pause (LW) is 9bits length.

The 82 bit STDMS consists of 1 start bit, 64 data bits, 16

CRC bits and 1 stop bit.

Start bit (1) Data(64) CRC (16) Stop bit (1) LW(9)

Memory organisation

As already mentioned above the 82 bits are stored in

laser programmed ROM (LROM). The 82 bits of this

LROM is partioned as followed (see Memory Map):

Factory reserved

IC name

Customer ID

ID code

CRC-CCITT

Start and stop bits

9 bits

10 bits

13 bits

32 bits

16 bits

2 bits

Memory Map

(First out)

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Start

Factory reserved

MSB

IC Name

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

LSB MSB

Customer ID

LSB

33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

MSB

ID code

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

ID code

LSB

65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81

LSB

CRC - CCITT

MSB Stop

Copyright  2001, EM Microelectronic-Marin SA

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www.emmicroelectronic.com

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