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MLX90109
125kHz RFID Transceiver
 Download MLX90109 Datasheet (PDF)
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MLX90109 General Description
The MLX90109 is a single chip RFID transceiver for the 125kHz frequency range. It has been conceived for minimum system cost and minimum power consumption, offering all required flexibility for a state of the art AM transceiver base station.
An external coil (L), and capacitor (C) are connected as a parallel resonant circuit, that determines the carrier frequency and the oscillator frequency of the reader. This eliminates zero modulation effects by perfect antenna tuning, and avoids the need for an external oscillator.
The reader IC can easily be switched to power down by setting the antenna amplitude to zero.
The MLX90109 can be configured to decode the transponder signal on-chip. In this case the decoded signal is available through a 2-wire interface with clock and data. For minimum interface wiring, the non-decoded transponder signal can also be made available on a single wire interface.
MLX90109 Features and Benefits
- Integrated RFID transceiver: Adressing 100kHz to 150kHz frequency range transponder, Biphase and Manchester ASK. ON/OFF keying modulation.
- Low Power and high performances: Unique Parallel Antenna concept for maximum power efficiency, Power down mode available, Baud rate selectable “on-chip” filtering for maximum sensitivity, No zero modulation problems.
- Low cost and compact design: SO8 package and high level of integration for compact reader design, No external quartz reference required, only 2 resistors plus antenna, On chip decoding for fast system design and ease of use, Open drain data and clock outputs for 2-wire serial communication.
MLX90109 Environmental Information
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MLX90109 Frequently asked Questions
RFID project help
Question
for a senior project, thinking to make something like this, RFID PC security
, can someone please suggest the Melexic's RFID tag and receiver? And can someone gives me some insights and suggestions ?.
we are required to use our own 68hc12 Microcontroller to interface the RF signals ..
the project goal would be .. somehow, program our own TAG(transponder if it's what it is) ..and send RFID data to the MLX90109 transceiver .. then MLX90109 would send the RFID data to the 68hc12 microcontroller, and then to the PC .. in which we will make our program to determine the data and verify the user identity for access rights ..
do all these sound logical and doable to you?
will all those pieces(transceiver and transponder) i mentioned do the job in this case?
had been trying to read more information ..
thinking to use MLX90109 125khz rfid transceiver ..
in which i can still found on Melexis webstore ... and about the transponder ? .. can someone gives me a suggestion ?
i couldn't find any of these three transponders from the webstore .. MLX90108, MLX90110, MLX90111 ..
Will any of these 3 work well with MLX90109 for the project i plan to do? ..
Answer
I will try to answer to all yours questions:
Melexis has two RFID transceiver ICs available: the MLX90109 (125kHz) and the MLX90121 (13.56MHz). The selection between the two depends on your system requirements (reading distance, size of the antennae, ...)
Both of them can be driven by the 68HC12.
Please note also that Melexis doesn't offer standard transponder ICs any longer. This is why you couldn't find on our WEB site obsolete references such as MLX90108, MLX90110 and MLX90111.
Our DVK boards are built according to the system you described TAG <-> Reader (beased on either 90109 or 90121) <-> PC. So, it shouldn't be any problem to develop the application you described. Please note that the reading distance of the MLX90109 will not exceed a couple of centimers, unless you use very large antennae.
MLX90109 read problem
Question
I have build a transponder reader using the MLX90109 and a PIC16F628.
The reader seems to perfectly work with the transponders model TITAN and EM4150 (1 KBit Read/Write Contactless Identification Device).
Our supplier has delivered to model EM4450 (new design of EM4150) from the datasheet perfectly identical to the EM4150,
but do not come absolutely read from the MLX90109.
Which can be the problem?
MLX90127 - Datasheet
Answer
I am looking for the datasheet for the MLX90127.
Also I need to purchase the following part number for my sample design.
MLX90109 - I can buy this online
MLX90124 - I can not buy this online
MLX90125 - I can buy this online,
I noted that the MLX90124 is the transponder, which I need to make it work with MLX90109 & MLX 90125.
Answer
Thanks for your interest in our products. The MLX90124 and the MLX90127 were both discontinued last year..
You can indeed buy on line both the MLX90109 and the MLX90125. But I would recommend you buy the development kit DVK90109 which comes which suitable tags for the MLX90109.
Question
Dear Patrick,
Thanks for the respond.
my current task is to make, RFID Reader, for which I need to supply with tag, I need the following inventory:-
50 x Base Station, MLX90109+MLX90125
100 x Read Only Tag - MLX90??? (factory programed ID)
I am planing to purchase the DVK90109 kit, BUT before that I need to make sure I can get the tag's for Melexis of any other supplier.
In this matter, I hope you can recomandand sutiable Read Only Tag for my project.
Answer
For the sourcing of the 50 MLX90109+MLX90125, there is no problem. You can order them at Melexis.
For the tags, they can be sourced at companies like Sokymat (www.sokymat.com). We can help to establish the communication if needed.
Answer
From Sokymat, you can buy tags which support one of the following standards : Unique ID, Hitag 1, 2 and S. They will work with the MLX90109.
Answer
Mr.Ting, have updated me on this too. I will arrange to get 50 unit of the MLX90109+MLX90125 for melexis,
as for the tag, I visited the www.sokymat.com, they have various type of the tag, could you please advice me which tag(s) will work with 90109+90125
I also will arrange the DVK90109, to speed-up my development.
MLX90109 Question
Answer
The MLX90109 was originally designed for automotive immobilizer applications. Therefore the reading distance was targeted at a couple a centimeters. I suppose this is what you experienced with the DVK, right ?
It is possible to increase the reading distance by using a larger antenna. What kind of reading distance are you looking for ?
Question
Now Why must I make the tag cling to the antenna to communicate.
another question:Can you customize the 100mm diameter antenna sample according the MLX90109?And pls provide the 100mm diameter antenna parameter for us.
Question
he MLX90124 is only an IC. If you want to source an assembled tag, you need to refer to a tag manufacturer, like Sokymat (www.sokymat.com).
Sokymat manufacturer the tags we provide together with the DVK90109.
The MLX90109 can support the following standards : Unique ID, Hitag 1, 2 and S.
Question about MLX90109
Question
I am interested in making my own RFID reader system using the MLX90109 RFID tranceiver. The datasheet for this chip doesn't describe the instructions and instruction format necessary to interface the MLX90109 with my own microprocessor. I will buy the chip once I get this information.
Proximity reader
Question
I want to design my own proximity reader but I am new to the design. I want to use MLX90109 but I did not understand the logic of how does it work ,especailly the use of the clock out pin. Also how does it read the ID from the proximity card? and how can take the data into the microcontroller?
MLX90109 & MLX90121 Choose
Question
I have two questions:
1.Witch one of MLX90109 & MLX90121 I have chouse for about 15 – 20 cm reading distance and minimum current needed by reader working with 3.3 v battery?
I prefer to use external coil antenna 70 - 80mm diameter on both reader and transponder side.
2.
Why in web store in don’t see EVB90109 & EVB90121 , MLX90109, MLX90121?
Question
What do you mean "At that time, we only promote our development kits DVK90109 and DVK90121"?
Can I buy MLX90109, MLX90121 chips without DVK in case everything OK and I need to build 100 reader's?
One more question. Can I buy one of DVK that include evaluation board for example DVK90109 and only evaluation board for second frequency?
As I understand development kits are the same and evaluations boards only a difference.
MLX90109 read distance
Question
I am using MLX90109 and I want to increase the read distance up to 7cm. I am getting 2.5cm at the moment. any help will be greatly appreciated.
Answer
At this time the only solution to increase the operating distance with the MLX90109 is to change the transceiver's antennas. Please find below some points to improve this operating distance.
Increasing the area (size) of the transceiver’s antenna.
Reducing the inductance value of the antenna will increase the current Iant which will therefore, increase the magnetic field produced.
A high quality factor (Q) will improve the energy transmit to the TAG. Care should be taken that a too high quality factor reduces the side bands of the back modulation of the TAG. For more information, please refer to the application note “Antenna design guide” which was written for 13.56MHz systems but is also valid for 125kHz.
Care should be taken to keep the global impedance of the transceiver’s antenna higher or equal to 1kOhms to insure a good start of the MLX90109 (auto start-up impedance).
MLX90109 mode pin directly to VCC?
Question
If MLX90109 tag reader chip will work always at the same speed and mode, can i connect pins 3 and 5 DIRECTLY to VCC or GND planes, without pull-up or pull-down resistors?
Answer
If in your application the type of communication is fixed, the SPEED and MODE pins of the MLX90109 (respectively pins 3 and 5) can be directly connected to VCC or GND.
MLX90109
Answer
The pin 2 of the MLX90109 has to be connected to the ground and not to the microcontroller. The schematic page 11 is correct only if the microcontroller output stays to ground. We will update the datasheet soon.
General quesions for EVB90109
Question
I want to use the MlX90109 with a 3.3V supply. What changes would have to be made to the evaluation board to run it at 3.3V and what reading distance can I expect using a 30mm EM4100 compatible tag?
Answer
To use the EVB90109 for +3.3V operation R2 should be increased from 8.2k to 15k so that VMODU remains higher than 0.8V per Note in paragraph 7.5 of the MLX90109 data sheet. The antenna voltage swing (also per paragraph 7.5) and field strength will be reduced with +3.3V operation, so EVB90109 operating range will be reduced from 2 to 15cm at +5V operation to 1 to 10cm at +3.3V operation. Other 125kHz transceiver ICs require +5V supply for operation and the MLX90109 parallel L-C antenna requires significantly less current than a series L-C antenna, it is an ideal solution for low current or battery powered applications.
MLX90109- power down
Answer
The two pins CLOCK and DATA are open drain outputs. Therefore, these pins must be pulled-up externally with two resistors of 100kohm (please refer to the FAQ section of the datasheet).
When the MLX90109 is in power down mode these two pins are pulled-up to the power supply.
Please note that DATA and CLOCK are output pins only. Modules connected to these pins will only receive decoded information from the MLX90109. Therefore, no collision are possible.
MLX90109 3V/5V reading distance
Question
In the MLX90109's datasheet there is mentioned the reading distance up to 15 cm (with the specified antenna etc). What is the "reading distace up to" if power supply is 3 volts?
General quesions for MLX90109
Question
I don't have a DVK90109, I only have the MLX90109 because I have other kits to use as devkits (AT90USBKEY and AVR STK500), but some kind of information on how to actually use the MLX90109 would be nice to have.
Answer
The MLX90109 is a 125kHz transceiver very simple to use. You will find lots of information in the datasheet of this product available on our WEB-site.
It requires a DC voltage on the MODU pin to set the field ON (Two resistors). After that, the demodulated information, according to the pins SPEED and MODE, is available on the pin DATA and CLOCK. These two pins must be pulled-up by externally.
To modulate information (100%), you only have to change the voltage on MODU according to the schematic on page 11 of the datasheet. For fast data rates, an external diode and transistor may be added in parallel to the antenna to reduce the fall time.
What I suggest you get the EVB90109 which is a very compact module including a parallel antenna. It will help you to start working with the MLX90109.
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