MELEXIS MLX90111 Datasheet

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. Temperature Range Package
MLX90111 25 °C Consumer Sawed wafer on frame

-40 to 85 °C Automotive Bare die in blistertape
SOIC-8 150mils

Production parts available Q1 2001

Functional Diagram 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.

MLX90111

Coil

L

GND

C

tune

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

MLX90111

128bit Read Write Transponder

MLX90111 Electrical Specifications

Operating Parameters are based on test set up (see Schematic below).
Toper = -40°C to 85°C, Operating frequency = 120kHz (unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Units

Regulated supply voltage VDD (3) 3.0 4.0 V
Power On Level VPOR Continuous normal reading of the ID 1.55 1.8 2.2 V
Sensitivity level (e.m.f.) Vacsens Continuous normal reading of the ID 200 170 mV
Modulation Depth ASK

Weak power: Vacmin = 200mVpp 0.2 4 V(4)
Medium power: Vac = 5Vpp 2.8 7.5 V(4)

High power: Vac = 20Vpp 5 10 V(4)
EEPROM writing supply voltage Vacee Critical reading ID 1 V
EEPROM writing supply current Iee 10
ACP modulation depth Vachigh=Vacee 20

µA

% (5)

EEPROM data retention Tret Critical reading ID 10 year
EEPROM write cycles Ncycle Critical reading ID 100k cycles
Coil-GND tune capacitor Toper=25oC 200 pF(6)
Total Tuning range Toper=25oC, 5bits 124 pF(6)
Tuning accuracy Toper=25oC, LSB/2 2.0 pF(6)

IclampLow VdutDC = +/- 2V 40 1000 NADC input current clamping
IclampHigh VdutDC = +/- 10V 1 3.5 10 mA

Notes:

Note (1): Specifications are tested 100% or
guaranteed by characterization.

Vin

L=6.8mH

Cpar=10pF

Vdut

COIL

Note (2): All specifications are valid for Manchester
and Biphase encoding, and for 2kbaud and 4kbaud
data rate options.

50

Qrc @ 120KHz=48.8

C1+C2=250pF

Vac

C1 C2

GND

90111

DUT

Note (3): Maximum supply voltage is generated by
forcing 10mA between coil and ground pin.

Note (4): Min = Vbottom (modulation on),
Max = Vtop (modulation off).

Note (5): Modulation depth is calculated as Vachigh -Vaclow / Vachigh + Vaclow. Lower modulation depths may
be applied, but the performance of the system may vary along the distance between reader and transponder coil.
Higher modulation levels will reduce the maximum Write distance.

Note (6): Lot to lot spread on capacitance is 20%. Temperature shift is typically 0% on -40°C, and +1% at 85°C.

MLX90111 128bit Read Write Transponder Page 2 of 12 Rev 1.12 5-Feb-01

Block diagram

COIL

MLX90111

128bit Read Write Transponder

VSS

Ctune

[mA]

15

Trimming

POR

CLOCK

RECOVERY

DEMODUL.

SUPPLY

Modulator

SPEED

CLOCK

DATA

VDD

M
O
D

Digital

Controller

RF Limiter

Cbuffer

ADDR
DATA

MLX90111 clamping (DC)

VDD

VDD

TCKIN
TEST

DATAIO

EEPROM

10

5

0

[V]

-20 -10 0 10 20

-5

-10

-15

MLX90111 128bit Read Write Transponder Page 3 of 12 Rev 1.12 5-Feb-01

EEPROM memory maps

ADDRESS

FUNCTION

COMMAND

F E D C B A 9 8 7 6 5 4 3 2 1 0
0
1
2
3

ID

4
5
6
7

Read memory map

CONTINUOUS

MLX90111

128bit Read Write Transponder

BITPOSITION (MSB first)

B

WPW

C

Tune+CFG

ADDRESS

FUNCTION

0
1
2
3

ID

4
5
6
7

Lock word: "01010101" WPW(FLAGS)

CMF1

0

CMF1

COMMAND

CMF1

T4T3T2T1T0

F E D C B A 9 8 7 6 5 4 3 2 1 0

Write memory map

8

WPW

Lock word: "01010101" WPW(FLAGS)

CMF2

0

0

0

0

0

BITPOSITION (MSB first)

0

0

0

CODE

SPEED

9

Tune

A

CFG

MLX90111 128bit Read Write Transponder Page 4 of 12 Rev 1.12 5-Feb-01

CMF2

CMF2

0

T4T3T2T1T0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

CODE

SPEED