UM0925 Datasheet, PDF (1/22 Pages) STMicroelectronics – Using the M24LR64-R datalogger reference design

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.
June 2010
Doc ID17271 Rev 2
1/22
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