Cannot write M24LR64E-R after MCU read a sensor Value

[yannick2399]

Posted on February 24, 2015 at 12:04

Hi,

For a project I use the M24LR64E-R as memory and power supply. Everything works very well if I want to read or write the M24LR64E-R. But as soon as I read another sensor, this sensor value cannot write to the M24LR64E-R. For this application I use the MCU MSP430FR of TI.

Following ANs I've read:

AN1471 (

http://www.st.com/web/en/resource/technical/document/application_note/CD00004295.pdf

 )

AN3057

(

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/CD00247968.pdf

 )

Errata sheet for M24LRXXE-R

(

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/errata_sheet/DM00052762.pdf

 )

But I don�t see any solution.

Questions:

1-

      1- 

Can we use the M24LR64E-R constantly on the RF Field (For power supply)? And at the same time using the I2C bus with other sensors? (This has been going when I use only the MSP430 and the M24LR64E-R).

2-

      2- 

Does anyone have used the M24LR64E-R as active Tag without a battery? (Always in the RF field but without command).

Thanks for the help.

Yannick.

#harvesting #m24lr #sensor

[yannick2399]

Posted on March 10, 2015 at 14:14Hi I've solved the problem. This works. !!! Everything is possible in this world !!!

[Anais GALLIGANI · Accepted solution]

Posted on June 26, 2015 at 16:00

Hi,

I am glad you finally succeed to do it. for others that might ask the same question, to the first question yes you can use constantly the M24LR64E-R constantly in RF field. In order to write inside the M24LR, the sensor values, and doing the Energy harvesting, it depends of the consumption of the complete system which can reset M24LR if it is too important. Have a great day, All the best, ST NFC/RFID Support