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PDF EM4069 Data sheet ( Hoja de datos )
| Número de pieza | EM4069 | |
| Descripción | (EM4069 / EM4169) 128 bit Read/Write Contactless Identification Device | |
| Fabricantes | EM Microelectronic | |
| Logotipo |  |
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EM MICROELECTRONIC - MARIN SA
EM4069
EM4169
128 bit Read/Write Contactless Identification Device
with OTP function
Description
EM4069 (previously named P4069) is a CMOS integrated
circuit intended for use in electronic Read/Write RF
transponders, with an optional lock function to disable
EEPROM write operations.
The IC is powered by picking the energy from a
continuous 125 kHz magnetic field via an external coil,
which together with the integrated capacitor form a
resonant circuit. The IC read out data’s from its internal
EEPROM or ROM and sends it out by switching on and
off a resistive load in parallel to the coil. Commands and
EEPROM data updates can be executed by AM
modulation of the 125 kHz magnetic field.
At power–up the EM4069 goes in default mode in which it
constantly (without any pause) transmits 128 bits from the
EEPROM. Upon transmission of a specific command, the
64 bits unique laser code is output. Additional commands
for writing and lock data in EEPROM are available.
The EM4169 (previously named P4169) is the same
device but with large bumps (mega pads) as indicated on
page 13 of this data sheet. All specified parameters and
descriptions are applicable for the EM4169 device.
Features
128 bit EEPROM organized in 8 words of 16 bits
64 bit fixed code memory array laser programmed
OTP feature convert EEPROM words in read only
Power on Reset sequence
Power-check for EEPROM write operation
Data transmission performed by Amplitude
Modulation (IC to reader and reader to IC)
Data encoding : Manchester or BI-Phase (FDX-B)
Transmission reader to chip: typically 65% AM
modulation
Data rate : 64 or 32 RF field periods per bit
(2 kBaud or 4 kBaud at 125 kHz)
78 pF resonant capacitor integrated on chip
100 to 150 kHz frequency range
On-chip rectifier and voltage limiter
No external supply buffer capacitor needed
-40 to +85°C temperature range
Very low Power consumption
Applications
Access Control
Animal Identification
Material Logistics
Typical Operating Configuration
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Pin Assignment
VSS
L EM4069
C1
VSS
EM4069
C1
Typical value for inductance L is 20.7mH at fO = 125KHz
Fig. 1
Fig. 2
Copyright 2003, EM Microelectronic-Marin SA
1
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1 page  
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
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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
Memory output
0
1 1 01 0 0 1
Modulator control
Modulation control “low” means high current
Fig. 6b
Copyright 2003, EM Microelectronic-Marin SA
5
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5 Page 
The Write Configuration word command procedure is the
same as above, the only exception is that only CRC
verification and power check are done.
Writing to EEPROM lasts 20 ms.
After successful writing of EEPROM the IC sends an
acknowledge pattern to confirm the completion of writing.
Acknowledge pattern consists of switching the modulator
load ON and OFF with a signal period of 256 µs (Option 64
clocks/bit) or 128 µs (Option 32 clocks/bit) representing
half a bit period (a quarter of bit period ON, a quarter of bit
period OFF). Acknowledge pattern is transmitted during a
time equivalent to two bit periods. Pulses of this length do
not occur during data readout so the acknowledge pattern
is easily recognizable.
tRDB
Acknowledge pattern
tRDB
Fig. 13
After sending the acknowledge pattern the EM4069
transitions to the Start Bit Detection state and waits for the
start bit of next command. In this way, several words can
be written to EEPROM without returning in read mode after
every write. The value of the timer is 2 tRDB.
Disabling of Command Detection
In certain cases the IC logic blocks the detection of the
Synchronization pattern Envelope during one complete
readout cycle of 128 bits. This is valid in the following
cases :
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at power up (after POR)
after a Reset command
after a time out occurs in the Start Bit Detection state
(only in the case the transition to Start Bit Detection
state was done from Read mode)
Details about command timing
Command timing is based on NRZ (non-return to zero)
modulation on the magnetic field (as shown in figure 11).
EM4069
EM4169
NRZ modulation is simple and leads to good results in
proximity of the reader. To send a bit-1, the reader does
not modulate the signal for a complete bit period, and to
send a bit-0, it modulates the carrier frequency during a
whole bit period.
Long streams of zeros (in write command data sequence
or CRC) reduce writing distance due to drop of supply
voltage under POR level, due to the long time the carrier
frequency is in LOW field mode.
The writing distance can be improved by using RTO (return
to one) modulation coding. Short burst of high field
(approximately 1/4 of bit period) during transmission of a
bit-0 to EM4069, recharge the on-board power supply
buffer capacitor. To operate in this way, it is important to be
synchronized with the sampling rate of the EM4069.
Figure 14 shows the processing of hexadecimal data “96”
in the write command string. The following signals are
drawn :
EM4069 : shows the modulator state. The “low” peak to
peak value indicates that the modulator load is connected,
and a “high” peak to peak value means that the modulator
load is disconnected.
NRZ : Reader generated field. Low field is forced when
sending a bit-0 and High field for a bit-1. The field is at the
same level for the whole bit duration.
RTO : Reader generated field as NRZ, with a burst of high
field during 1/4 period for the transmission of a bit-0.
At the beginning of timing diagram, the EM4069 is in start
bit detection state, modulator load and peak detector are
ON. When the start bit is detected, the logic transitions in
command processing state. 3/8 to 1/2 of a bit period after
beginning of start bit (T1), EM4069 starts putting the
modulator load half bit period OFF and half bit period ON.
The sample of field strength which gives to the logic the
value of bit is taken at the end of ON period.
Assuming that the start bit duration is 1 bit period, the
following bit samples are taken 3/8 to 1/2 of bit period after
start of each bit period. So during the last quarter of bit
period the field can be put high to recharge the EM4069
on-board capacitor.
The sampling point can be moved by changing the start bit
duration.
Copyright 2003, EM Microelectronic-Marin SA
11
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| PDF Descargar | [ Datasheet EM4069.PDF ] | |
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