EM4069A6WS11E 데이터 시트보기 (PDF) - EM Microelectronic - MARIN SA

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EM4069A6WS11E

128 bit Read/Write Contactless Identification Device with OTP function

EM Microelectronic - MARIN SA 

EM4069 Modes of operation

IDLE

RF-field detected

INIT

Reset

Command

EEPROM Read Mode

Sync-Pattern

Command finished

Command State

Fig. 5

Read Mode

The EM4069 holds 128 bits of user EEPROM. These 128

bits are cyclically read out by default. Using the write

command, the EEPROM words can be modified. The

EEPROM contains an additional configuration word used

to protect writing in the EEPROM

EM4069

EM4169

The EM4069 additionally holds a unique 64 bit read only

identification code, which can be accessed by using the

Read ROM command.

Manchester encoding

One bit period lasts 64 (or 32) field frequency periods

(512 (or 256) µs at 125 kHz). The Manchester coding

shows a transition from ON to OFF or from OFF to ON in

the middle of bit period. At the transition from logic bit “1”

to logic bit “0” or logic bit “0” to logic bit “1” the phase

change. Value "high" of data stream presented below

represents modulator switch OFF, "low" represents

switch ON (see figure 6a).

Bi-phase encoding

One bit period lasts 64 (or 32) field frequency periods

(512 (or 256) µs at 125 kHz). The BI-phase coding shows

a transition from ON to OFF or from OFF to ON in the

middle of a bit period when the data bit is a logical “0”. A

logical bit set to “1” will keep its ON or OFF state for the

whole bit period. There is always a transition from ON to

OFF or from OFF to ON at the beginning of a bit period.

The picture below shows part of a data stream. Value

“high” of data stream represents modulator load OFF,

“low” represents modulator load ON (see figure 6b).

Manchester encoding

Binary data

Memory output

X1 1 1 1 1 1 1 1 1 0 1 0 1 0 0 0 1 1 0

Modulator control

Bi-phase encoding

Modulation control “low” means high current

Fig. 6a

Binary data

0

Memory output

1

1

0

1

0

0

1

Modulator control

Modulation control “low” means high current

Fig. 6b

Copyright  2003, EM Microelectronic-Marin SA

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www.emmicroelectronic.com

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