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EM4006F9WS7E Datasheet(PDF) 4 Page - EM Microelectronic - MARIN SA

Part # EM4006F9WS7E
Description  13.56 MHz 64 Data bit Read Only Contactless Identification Device
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Manufacturer  EMMICRO [EM Microelectronic - MARIN SA]
Direct Link  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM4006F9WS7E Datasheet(HTML) 4 Page - EM Microelectronic - MARIN SA

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EM4006
Copyright
 2001, EM Microelectronic-Marin SA
4
www.emmicroelectronic.com
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)
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
9 bits
IC name
10 bits
Customer ID
13 bits
ID code
32 bits
CRC-CCITT
16 bits
Start and stop bits
2 bits
Memory Map
(First out)
01
234567
89
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


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