M24C02-FMH6TG: I2C Adresses in e.g. Linux is not fixed?

[jRn]

Hello Team,

we have a board with 5x I2C devices on it. So far it works fine but we have a strange effect.

We have 1x M24C02-FMH6TG (0x50 --> fixed??) and 1x M24C64-DFMC6TG (0x54 -> fixed!) from STM

Additionally we have further devices like temperature sensor (0x4A), RTC (0x51) and SEC (0x48).

So in Linux we are doing a i2c address scan and suddenly we have the address 0x50 until 0x57 in our system. After removing the M24C02-FMH6TG the right 4 i2c-address are shown in the system.

If the M24C02-FMH6TG is placed we also have access on the other EEPROM and RTC as well. But it shown more i2c addresses.

What kind of effect does the M24C02-FMH6TG have. At this IC it is not possible to configure the i2c address externally.

Best regards,

Juergen

[Pierre P.]

Hello Juergen,

We don't recommend to share the I2C bus with other sensors when M24C02-FMH6TG is mounted.

Indeed, as you have guessed, this one could also answer also to 0x50 to 0x57.

Sorry for inconvenience.

Br

Pierre P.

[jRn]

Hello Pierre,

thanks for the feedback, but were can i found such an information? There is no further information about this in the datasheet.

Thanks!

Br

Juergen

[Pierre P.]

A new release of M24C02 datasheet will mention this point.

(FYI: M24C04/08/16 have also same behavior)