M24M02 I2C EEPROM Read Lock Status

[ttatakis]

Posted on February 16, 2017 at 15:48

I am looking at the data sheet for the M24M02 and I want to read the Lock Status.  The data sheet says this

The locked/unlocked status of the Identification page can be checked by transmitting a specific truncated command [Identification Page Write instruction + one data byte] to the device. The device returns an acknowledge bit if the Identification page is unlocked, otherwise a NoAck bit if the Identification page is locked.

If I send the ID Page Write instruction plus one data byte, won't that actually write the data byte if the ID page is not locked?

Or does this mean to send the Device ID byte plus one byte (which would be the first address byte in a real write command)?

Thanks for your help.

Tom

[S.Ma]

Posted on February 16, 2017 at 17:38

The second one is making sense, NACK when trying to set the sub-address in write mode... (can be tried multiple time as long as no further byte is written after the sub address....)

Will be trying it in the coming weeks on M24128 with bitbang I2C IOs.