P4069 EM Microelectronic, P4069 Datasheet - Page 4

• Manufacturer Part Number: P4069
• Description: 128 Bit Read/write Contactless Identification Device With Otp Function
• Manufacturer: EM Microelectronic

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 (~V
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 P4069 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.
Functional Description
EM MICROELECTRONIC-MARIN SA
POR
– 250mV).
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 P4069. 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 P4069 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.
VPOR
Reset
VDD
P4069/P4169
P4069 Active
Hysteresis
Figure 4
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