EM4169A5CB2RC 데이터 시트보기 (PDF) - EM Microelectronic - MARIN SA

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EM4169A5CB2RC

128 bit Read/Write Contactless Identification Device with OTP function

EM Microelectronic - MARIN SA 

Functional Description

The IC builds its power supply through an integrated

rectifier. When it is placed in a magnetic field the DC

internal voltage starts to increase.

As long the power supply is lower than the power on reset

(POR) threshold, the circuit is in reset mode to prevent

unreliable operation. In this mode the modulator switch is

off.

After the supply voltage cross the POR threshold, the

circuit goes in read mode and transmits periodically the

128 data bits from EEPROM.

The power on reset is designed with a typically 250mV

hysteresis. The specified value in the DC electrical

characteristic table indicates the high level-switching

threshold. Ones the supply voltage had reached this level,

the device work in read mode and reenter in reset mode if

the supply voltage decrease under the lower threshold

(~VPOR – 250mV).

In read mode the IC transmits periodically either the 128

data bits from EEPROM or 64 data bits from ROM if

command 2 has been sent. The bits are Manchester or BI-

phase coded and issued by switching the modulator load in

parallel to the coil ON and OFF. The read out process is

repeated continuously without any pause as long as power

level is greater than the POR threshold low.

While the IC is operating in read mode it checks the coil

signal once every bit period. If it detects a certain reader

induced amplitude modulation of magnetic field it stops

modulating and waits for a command word. In the case the

EEPROM write command is detected the contents of

selected EEPROM word is modified. Read ROM command

will change the output sequence to the data provided by

the laser ROM continuously.

The Reset command returns to the initial mode as after a

Power on Reset.

Block description

Power On Reset (POR)

When the EM4069 with its attached coil enters an

electromagnetic field, the built in AC/DC converter will

supply the chip. The DC voltage is monitored and a Reset

signal is generated to initialise the logic. The Power On

Reset is also provided in order to make sure that the chip

will start issuing correct data.

Hysteresis is provided to avoid improper operation at the

limit level.

EM4069

EM4169

VDD

VPOR

Hysteresis

t

Reset

EMP44006699AcAtivcetive

t

Fig. 4

Clock Extractor

The Clock extractor will generate a system clock with a

frequency corresponding to the frequency of the RF field.

The system clock is used by a sequencer to generate all

internal timings.

Data Extractor

The transceiver generated field will be amplitude

modulated to transmit data to the EM4069. The Data

extractor demodulates the incoming signal to generate

logic levels, and decodes the incoming data.

Modulator

The Data Modulator is driven by the serial data output from

the transceiver. The modulator will draw a large current

from both coil terminals, thus amplitude modulating the RF

field according to the selected memory data.

AC/DC Converter and Voltage Limiter

The AC/DC converter is fully integrated on chip and will

extract the power from the incident RF field. The internal

DC voltage will be clamped to avoid high voltage in strong

RF fields.

Lock All / Lock Memory Area

The EM4069 can be converted to a Read Only chip or be

configured to Read/Write and Read Only Areas by

programming the protection word. This configuration can

be locked by write inhibiting the Write Protection Word.

Great care should be taken in doing this operation as there

is no further possibility to change the Write Protection

Word. The Control Word can also be protected in the

same way thus freezing the writing operation.

Copyright  2003, EM Microelectronic-Marin SA

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