EM4006F9WT7E Ver la hoja de datos (PDF) - EM Microelectronic - MARIN SA

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EM4006F9WT7E

13.56 MHz 64 Data bit Read Only Contactless Identification Device

EM Microelectronic - MARIN SA 

supply voltage

VDD

chip operating voltage range: from Vmin to Vmax

Vmax (voltage clipping)

EM4006

chip supply voltage

Vr (Read wake up)

Vmin

modulator

ON/OFF

ON

OFF

64 bits

period

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.

time

READ

time

Fig. 7

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.

Copyright  2001, EM Microelectronic-Marin SA

7

www.emmicroelectronic.com

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