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PDF MLX90111 Data sheet ( Hoja de datos )
| Número de pieza | MLX90111 | |
| Descripción | 128bit Read Write Transponder | |
| Fabricantes | Melexie | |
| Logotipo |  |
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MLX90111
128bit Read Write Transponder
Features
- 144bit EEPROM code, flexible Read Write Transponder IC
- Very Big reading range, and large write range.
- ID configured as 8 user words of 16 bits, and multiple write protection levels, including OTP
- 16 bit Configuration word with lock flags per word and option bits
- Different encoding and datarate options
- 250pF integrated tuning capacitance with wide post assembly tuning range
- 100,000 write cycle, 10 year EEPROM retention
- Guaranteed data integrity for reliable programming
Applications
Animal ID (ISO 11784, -85 compliant), ATM, Access Control, Material Logistics, Overmoulded
assemblies with important detuning effects.
Ordering Information
Part No.
MLX90111
Temperature Range
25 °C Consumer
-40 to 85 °C Automotive
Production parts available Q1 2001
Package
Sawed wafer on frame
Bare die in blistertape
SOIC-8 150mils
Functional Diagram
MLX90111
Coil
L Ctune
GND
Description
The MLX90111 is a flexible 128 bit Read Write
Transponder IC operating at 125kHz. It has been
designed for high performant and highly reliable RFID
systems requiring multiple write access to the
transponder memory.
Clock and power supply are taken from the
electromagnetic field. A resistor is switched in parallel to
the resonant circuit formed by the integrated tuning
capacitor and the external coil, to amplitude modulate
the electromagnetic field. Encoding of the 128 bits ID
and data rate can be defined by setting the
corresponding EEPROM bits.
High quality factors can be applied as the frequency can
be tuned over a range of +/-10% to +/-0.5% accurate
after assembly, by changing the value of the tuning
capacitor up to +/- 2pF.
The EEPROM is configured as 11 words of 16 bits.
Words 1 to 8 form the ID and are continuously read out
during normal operation. Each of these can be
individually locked, or the complete EEPROM can be set
to read only.
The transponder can be written over the full range from
0% to 60% of the normal reading distance. The
transponder stops modulating when receiving an AM
asynchronous pattern. It will then synchronize on the
first bit it receives. The 32 bit write command is
transmitted using Return to One modulation, including
direct word addressing and multiple security checks.
Data integrity is guaranteed by critical read out after
programming.
MLX90111 128bit Read Write Transponder Page 1 of 12
Rev 1.12 5-Feb-01
1 page  
MLX90111
128bit Read Write Transponder
General Description
The MLX90111 is a 128bit Read Write
transponder IC.
The integrated tune
capacitance and the external coil form a
resonant LC antenna that absorbs part of the
electromagnetic energy radiated by the
transceiver LC antenna. Physically, a magnetic
coupling occurs between the transceiver, also
referred to as "reader", and transponder
antennas
To amplitude modulate (AM) the RF carrier, the
transponder damps the electromagnetic field by
switching a resistor in parallel with its coil. This
way the transponder repetitively transmits its
128bit-identification code (ID) to the transceiver,
which recovers the envelope of the damped
field, and decodes the ID.
The transceiver can send commands and data
to the transponder by modulating the amplitude
of the carrier.
POR level
When the transponder is placed in an external
radio frequency (RF) field of appropriate
frequency and amplitude, the internal power
supply (VDD) can build up as charge on the
integrated buffer capacitance. The modulation
resistor is switched on and off as soon as VDD
has reached the Power On Reset (POR) level.
When the modulation resistor is switched on, the
LC circuit is no longer tuned, therefore no
energy is taken from the field, and VDD drops
due to internal consumption. Hence, by
switching the modulation resistor on and off, it is
possible to oscillate around the POR level. This
phenomenon is referred to as hiccuping.
The modulation resistor is switched off when the
transponder drops below the POR level.
Sensitivity level
The minimum electromagnetic force (e.m.f.)
needed to avoid hiccuping is defined by
Vacsens. At this level the power supply will not
drop below the POR level while the modulation
resistance is switched on during modulation.
Clock recovery
The transponder takes its clock from the carrier
frequency. Depending on the speed option, the
carrier frequency is divided by 32(4kbaud),
64(2kbaud) to generate the bit rate.
Demodulator
If the external RF field is AM modulated
according to the asynchronous control pattern
(ACP), the transponder stops transmitting the ID
and enters the Program Mode.
Data is then sent to the transponder using
Return to One encoding. First half bit is low (0)
or high (1), and the second half is high. In the
middle of each half bit one sample is taken. In
order for the transponder to detect the ACP
modulation a minimum modulation depth is
required. See timing specification below for
more details on the write protocol.
RF limiter, or clamping
The build up of voltage on the resonant LC
circuit is limited to avoid damaging the internal
circuit.
Modulator
The modulator consists of a modulation resistor
that is switched in parallel with the resonant LC
circuit (antenna). Because in weak RF fields the
rising edge is much slower than the falling edge
of the envelope, a symmetrically driven
modulator would give an asymmetrical envelope.
This is anticipated by delaying each falling edge
by a fixed number of RF clock pulses. The
modulator is hence driven asymmetrical. Each
ON state is reduced by 8 (4) clocks in 2 (4)
kBaud mode, and each OFF state is prolonged
by the same amount.
Speed Total clocks
per Bit
2kbaud
64
4kbaud
32
Clocks ‘ON’ state
Long ON = 64 - 8
Short ON = 32 - 8
Long ON = 32 – 4
Short ON = 16 – 4
Clocks ‘OFF’ state
Long ON = 64 + 8
Short ON = 32 + 8
Long ON = 32 + 4
Short ON = 16 + 4
MLX90111 128bit Read Write Transponder Page 5 of 12
Rev 1.12 5-Feb-01
5 Page 
MLX90111
128bit Read Write Transponder
Flow Chart.
POR
No
Continuous
Normal Read
(Transmit ID)
Critical Read=1?
Yes
Continuous
CriticalRead
(Transmit ID)
ASYNC
detected
Y
Stop modulating
Addresses:
0..7: Write Id
8: Write WPW
9: Write Tune bits
A: Write Code, Speed bits
B: Read WPW
C: Read Tune, code and Speed bits
Y Watchdog expired?
N
N
Parity/WPW/CRC check
OK?
Y
Write to ID?
address[0..7]
Y Set Critical Read=1
N
Write to
address 8/9/A?
Y Program word in EEPROM
N
N
Read
address B or C?
Y
Read Critical
(Once High, Once Low)
MLX90111 128bit Read Write Transponder Page 11 of 12
Rev 1.12 5-Feb-01
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MLX90111.PDF ] | |
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