UM1479 Datasheet, PDF (1/28 Pages) STMicroelectronics – The M24LR64-R is a dual interface EEPROM which targets a wide range of applications

UM1479
User manual
STEVAL-IPR002V1: M24LR64-R based data logger and
event logger
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. RFID (13.56 MHz) and
I²C serial communication are the two interfaces available with the EEPROM. This user
guide describes how to use the “M24LR64-R data logger/event logger”, an autonomous
battery-powered RFID tag with logging capability for recording and storing the sensor data
of the following sensors:
■ Temperature sensor
■ Humidity sensor
■ Vibration
■ Freefall
■ Tamper
■ Light
The value of different sensors is stored inside the EEPROM and these logged values can
then be retrieved over the RFID interface for evaluation at a later stage. This data logger can
be inserted along with any transported article and this article can then be tracked
throughout the supply chain, and the data can be scanned at any point using an RFID
reader.
This system can operate in two modes:
■ Data logger mode
■ Event logger mode
In data logger mode, the system reads all the sensor values once every second and stores
them inside the EEPROM. The system stops logging the data when the allocated memory
for a particular sensor is filled. In event logger mode, the system configures the threshold
limits for each sensor. Whenever the sense value is outside the set threshold limits, it is
stored in the EEPROM.
Figure 1. M24LR64 EEPROM-based data logger
April 2012
Doc ID 022381 Rev 1
1/28
www.st.com