UM1479

System overview

Doc ID 022381 Rev 1

19/28

2

System overview

This data logger demo is used to log the data of 6 sensor parameters inside the EEPROM

interface using the RFID reader.

The M24LR64-R EEPROM has 8 Kbyte (8192 bytes) of memory. In this data logger

application, EEPROM memory is partitioned as follows:

1.

RTC date and time: 8 bytes

2.

Temperature sensor: 3064 bytes

3.

Humidity sensor: 1024 bytes

4.

Freefall: 1024 bytes

5.

Vibration: 1024 bytes

6.

Light: 1024 bytes

7.

Tamper: 1024 bytes

Total values which can be logged in the EEPROM along with time stamping for each value

are:

1.

For temperature: maximum 764 values

2.

For humidity: maximum 254 values

3.

For freefall: maximum 255 values

4.

For vibration: maximum 255 values

5.

For light: maximum 255 values

6.

For tamper: maximum 255 values

If the log count for any sensor has reached its maximum value, the data logging for that

sensor stops. There is no overwriting of data for any sensor.