H4006 Datasheet, PDF (4/10 Pages) EM Microelectronic - MARIN SA – 13.56MHz 64 Data bit Read Only Contactless Identification Device

EM MICROELECTRONIC-MARIN SA H4006
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)
Table 4
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 table 5):
Wafer Number
Factory reserved
IC name
Customer ID
Extended lot number
IC position
Cyclic redundancy check
Start and stop bits
5 bits
4 bits
10 bits
13 bits
18 bits
14 bits
16 bits
2 bits
First bit sent is bit 0.
4