ST M24LR64-R User manual

June 2010 Doc ID17271 Rev 2 1/22
UM0925
User manual
Using the M24LR64-R datalogger reference design
Introduction
The M24LR64-R is a Dual Interface EEPROM which targets a wide range of applications
such as industrial or medical equipment and consumer electronics. It provides extra
flexibility for the design of electronic devices and for upgrading equipment parameters.
Because it features an RFID and a serial interface, the M24LR64-R is also a good fit for
RFID-enabled sensors, for which ST has developed a reference design. This user guide
describes how to use the "M24LR64-R data logger reference design", an autonomous
battery-powered RFID tag with data logger capability for recording and storing 64 Kbits of
temperature data (~4000 values).
The M24LR64-R provides:
●I²C serial interface operating at 400 kHz, from 1.8 V to 5.5 V
●ISO15693 / ISO 18000-3 mode 1 RF interface operating at 13.56 MHz
●64 Kbit EEPROM user memory
●32-bit password protection (not used in this reference design)
M24LR64-R powered data loggers can use different types of sensors such as temperature,
pressure, shock, humidity or other environmental factors. The transported articles can be
tracked throughout the supply chain, and the data can be scanned at any point using an
RFID reader.
The "M24LR64-R data logger reference design" is intended to help you get started with your
own data logger design. It uses a temperature sensor and and enables the user to start and
stop temperature acquisition and to set the acquisition frequency.
www.st.com

Contents UM0925
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Contents
1 System description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 M24LR64-R datalogger hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Compatible RF readers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 System prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Main menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2.1 Data logger application menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 Using the data logger application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 User interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Data acquisition mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3.1 Status indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.4 Tracing a graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.5 Stopping acquisition mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 Changing the data logger settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 Delay selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2 Overwrite checkbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5 System status pictograms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

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1 System description
1.1 M24LR64-R datalogger hardware
The M24LR64-R datalogger hardware is implemented using the following components:
●Dual Interface EEPROM (M24LR64-R)
●8-bit microcontroller (STM8L)
●Temperature sensor (STTS75)
●RF antenna, size : 75 mm x 45 mm (2.9 in x 1.77 in)
Refer to Figure 1.
1.2 Compatible RF readers
The M24LR64-R data logger reference design is able to work with following readers :
●Development kit reader (DEVKIT-M24LR-A): mid-range RF reader (ISO 15693, RF
13.56 MHz) interfaced via the USB bus (ref: FEIG ID ISC.MR10 A) connected to an
external pad antenna (FEIG ID ISC.ANT340/240) and an external power supply for
increased read range. See Figure 2
●Demonstration kit reader (DEMOKIT-M24LR-A): mid-range RF reader (ISO 15693,
RF 13.56 MHz) interfaced via the USB bus (ref: FEIG ID ISC.MR101 USB). See
Figure 3
●Starter kit Reader (STARTERKIT-M24LR-A): mid-range RF reader (ISO 15693, RF
13.56 MHz) interfaced via the USB bus. See Figure 4.
Note: The serial EEPROM USB reader is not suitable for use with the M24LR64-R datalogger.
Figure 1. Data logger format ANT 1

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Figure 2. Development kit USB RF reader with external antenna
Figure 3. “Demonstration kit RF reader (ISO 15693, RF 13.56 MHz)

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Figure 4. Starter kit mid-range RF reader (ISO 15693, RF 13.56 MHz)

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2 Getting started
2.1 System prerequisites
The data logger application software can be started from:
●a suite of Dual Interface EEPROM software called "M24LRxx_Application_Software"
●or from the standalone M24LR64-R Data Logger Application.
The user interface is almost the same in both cases.
Before starting you must first:
●Install the setup.exe file.
●Install the corresponding drivers
●Connect the reader via cable to the PC.
Please refer to Install Guide if you encounter problems during installation.
In Windows Desktop, double click the M24LRxx_Application_Software icon.
When the application starts, you will be prompted to select the kit you wish to use as shown
in Figure 5.
Figure 5. Startup dialog box

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You must select one of the three following kits to work with the M24LR64-R datalogger:
●Starter kit
●Demo kit (USB based)
●Demo kit (based on the RS232 port - old version)
●Development kit
Then press the OK button.

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If you have a Development kit, choose one of the following methods.
First method:
Choose a Demo kit (USB or RS232) depending on the connection that you want to
use.
Do not check the option: add Serial EEPROM USB Reader.
Second method:
Plug the USB RF Reader to the PC.
Plug the USB serial EEPROM reader to the PC.
Note: The serial EEPROM USB reader (I2C connection) is not suitable for use with the data logger
application. Do not connect I2C cable to the data logger.
Once the kit has been selected, the software checks that the selected readers are properly
connected. A progress bar appears during the check as shown in Figure 6.
Figure 6. Connection check performed by the M24LR64-R datalogger software

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If a problem occurs, a message box is displayed to indicate what the problem is:
●If the development kit is used, the problem could be:
– medium-range RF reader not plugged in the USB port
– medium-range RF reader driver not installed
– I2C bus reader not plugged in the USB port
– I2C bus reader driver not installed
●If the demo kit is used, the problem could be:
– medium-range RF reader not plugged in the USB port
– medium-range RF reader driver not installed
●If the starter kit is used, the problem could be:
– Short-range RF reader not plugged in the USB port
– Short-range RF reader driver not installed
2.2 Main menu
When drivers have been installed correctly, and the selected reader has been connected to
the PC, the application main menu appears.
2.2.1 Data logger application menu
Use the menu at the top to start the data logger application.
See Figure 7

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Figure 7. Data logger application main menu

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3 Using the data logger application
3.1 Operating conditions
For the application to work properly, you must respect the following conditions:
●When you perform the START, STOP or TRACE GRAPH functions, make sure that the
M24LR64-R datalogger is in the reader field as shown in Figure 8.
●Once the acquisition has started, the M24LR64-R datalogger does not need to remain
within the reader field to acquire and save temperatures.
Figure 8. Operating conditions
3.2 User interface
The first interface displayed when you launch the Data Logger application, is the main dialog
box shown in Figure 9.

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Figure 9. Main data logger application dialog box
At this stage, the dialog box displays an illustration of the M24LR64-R datalogger and
prompts you to select one of the following choices:
●Click on Start to send a RF condition to the data logger. Once the start condition has
been sent, the M24LR64-R datalogger begins to acquire temperatures. See Figure 10.
●Click on Graph to read out the temperature data stored in the M24LR64-R datalogger
and display it in a graph. See Figure 10
3.3 Data acquisition mode
In this mode, the user interface display is modified:
– Additional indicators and buttons appear
– An animation starts on the M24LR64-R datalogger image

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Figure 10. Data acquisition mode
3.3.1 Status indicators
Thermometer display
If the M24LR64-R datalogger is in the reader field, the thermometer indicates the
temperature measurement in real time. If the M24LR64-R datalogger is out of range, an
error message is displayed. See Figure 11.
Figure 11. Thermometer

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Meteorological pictograms
The meteorological pictograms indicate the measured temperature trend (rising or falling
temperatures).
See Figure 12.
Figure 12. Meteorological pictograms
Number of acquisitions
Number of acquisitions: Shows in real time how many temperature measurement values
have been recorded.
Figure 13. Number of acquisitions
M24LR64-R datalogger system status
This animated graphic displays the system state and the active communications interfaces
(left: RF communication / right: I2C communication).
Figure 14. M24LR64-R datalogger system status
Note: As soon as acquisition mode starts, the start button changes into a stop button, which
allows you to stop the acquisition at any time.

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3.4 Tracing a graph
Using the TRACE GRAPH button you can generate a graph of the acquired temperatures
saved in the M24LR64-R dual mode EEPROM in the M24LR64-R datalogger.
Note: As soon as you click on the TRACE GRAPH button, it changes into a REFRESH GRAPH
button which allows you to update the graph with the latest acquired temperature values.
Note: Don't forget that the M24LR64-R datalogger must be in the reader field to communicate with
the user interface.
Figure 15. Display temperatures in a graph
Dynamic view option: A checkbox appears under the graph which allows you to make the
view dynamic (the graph is updated in real time with latest temperature acquired). See
Figure 16.
This option is only available when the DELAY RATE is set to 1s (see Section 4.1: Delay
selector on page 18).
Figure 16. Dynamic view checkbox
3.5 Stopping acquisition mode
If you click on the STOP button, the M24LR64-R datalogger stops measuring temperatures
until the next start condition.

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Any previously acquired temperatures are still available after a stop condition, the graph
button can be still used to display a graph of the acquired data. See Figure 16
Note: As soon as acquisition mode is stopped, the STOP button changes into a START button,
which allows you to start a new acquisition at any time. This clears the EEPROM memory
and all previously saved temperature values are lost.
Figure 17. Acquisition stopped

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4 Changing the data logger settings
In the "M24LRXX application software" main menu, click on data logger then on data logger
settings as shown in Figure 18.
Figure 18. Data logger settings menu
A dialog box appears and allows you to change the acquisition rate and the overwrite
authorization. See Figure 19.

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Figure 19. Data logger settings
4.1 Delay selector
The delay selector allows you to choose the delay between two temperature acquisitions.
Click on the update button to set the new delay.
Example: If you choose a 512 ms delay the data logger acquires and saves two
temperature values every second.
4.2 Overwrite checkbox
The overwrite checkbox allows you to choose what the data logger does when the memory
is full.
●Check the box to enable overwrite: After saving the last temperature, the memory is
cleared and the cycle restarts from the beginning.
●Uncheck the box to disable overwrite: after saving the last temperature, the data
logger automatically performs a stop condition and remains in this state until the you
send a new start condition.

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5 System status pictograms
There is no M24LR64-R datalogger in the reader field
Figure 20. No RF
RF communication progressing
Figure 21. RF
I2C communication progressing
Figure 22. I2C
Red lines blink
while I2C
communication
is in progress

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Battery LOW
Figure 23. Low battery
Acquisition stopped
Figure 24. Acquisition stopped
No animation
displayed when
acquistion
is stopped