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Solved: is password required for RF-OFF via I2C?

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joaquim
Associate III

‎2014-04-23 02:19 AM

Posted on April 23, 2014 at 11:19

Hi,

can I disable the RF field of the M24SR by writing a 0x00 in the 0x06 offset of the system file 0xE101? Do I need to send any password-related command before?

Can anybody please the NAK question in [DEAD LINK /public/STe2ecommunities/memories/Lists/M24SR%20Series/Flat.aspx?RootFolder=/public/STe2ecommunities/memories/Lists/M24SR%20Series/Cannot%20write%20M24SR%20after%20MCU%20read&FolderCTID=0x01200200770978C69A1141439FE559EB459D758000ED3A9C6410AD9C49B9619F3BDE3D015F&TopicsView=https%3a//my.st.com/public/STe2ecommunities/memories/Lists/M24SR%2520Series/AllItems.aspx&currentviews=42]this link?

Thanks, I will be waiting for your answers.

#password #i2c #m24sr
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Anais GALLIGANI
Senior II

‎2014-05-07 06:26 AM

Posted on May 07, 2014 at 15:26

Hello,

Concerning the password, as described in the datasheet table 10 (Table 10. Details about the RF enable field), the bit 0 of system byte @0006 can be used to enable (1) / disable (0) RF interface. So writing 0x00 in system file offset 0x0006 will disable RF interface.

The table 6 (Table 6. Field list), explains that this modification can be done only by I2C, and if access rights are granted; that’s means when I2C_Protect byte = 00 (no I2C password required) or I2C_Protect byte = 0x01 (I2C password required) and in this case, I2C password must be presented .

have a nice day,

best regards,

st nfc/rfid dynamic tag e2e support

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Anais GALLIGANI
Senior II

‎2014-05-07 06:26 AM

Posted on May 07, 2014 at 15:26

Hello,

Concerning the password, as described in the datasheet table 10 (Table 10. Details about the RF enable field), the bit 0 of system byte @0006 can be used to enable (1) / disable (0) RF interface. So writing 0x00 in system file offset 0x0006 will disable RF interface.

The table 6 (Table 6. Field list), explains that this modification can be done only by I2C, and if access rights are granted; that’s means when I2C_Protect byte = 00 (no I2C password required) or I2C_Protect byte = 0x01 (I2C password required) and in this case, I2C password must be presented .

have a nice day,

best regards,

st nfc/rfid dynamic tag e2e support

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