H4006 Datasheet, PDF (9/10 Pages) EM Microelectronic - MARIN SA – 13.56MHz 64 Data bit Read Only Contactless Identification Device

EM MICROELECTRONIC-MARIN SA H4006
Miller Encoder
The input to Miller encoder is NRZ data coming
from LROM. The output is coded according to
Miller format and is driving the modulator Switch.
See figure 6 for example of Miller code.
Clock Generation
The clock of the logic is extracted from the RF
signal. The clock extracted from RF signal is
driving the divider chain consisting of toggle flip-
flops. The output of this divider chain is data
clock with which the data from Laser ROM
(LROM) is addressed, encoded and sent to
Modulator Switch.
The layout of divider chain is designed in a way
that different data rates can be chosen with metal
mask (options).
The following division factors are possible on
request:
128, 256, 1024, 2048, 4094 and 8192.
The standard is 512.
Others
As mentioned in Output Sequence, during the
pause (LW) the Modulator Switch is OFF. When
observing the pause duration one has to
remember that the time with Modulator Switch
OFF effectively observed can vary due to
different terminations of STDMS. The stop bit at
0 can be represented either by Modulator Switch
ON or OFF depending on the data. The start bit
at 1 adds 1/2 of data period OFF (transition in the
middle of bit period).
Figure below show the four possible terminations
of STDMS and its influence on entire period
passed by Modulator Switch OFF. Level LOW
represents Modulator Switch OFF. LDB stands for
last data bit.
LDB
1
1
0
0
Last data
bit
Stop bit
Pause 8 +1 bit periods
at 0
This transition is not due to Miller encoding.
Pad Description
Name
C2
C1
VDD
Tout
TESTn
VSS
Description
connection to antenna
connection to antenna
positive supply
test output
test input with pull up
negative supply
Table 6
Start bit
at 1
Figure 8
9