TPS544C26: Please share the passcode to unlock the device access

Hi Nancy,

Thanks for the file. Actually I'm performing the register operations not through the TI Fusion digital designer tool, but by driving the I2C lines using an FTDI microcontroller chip. Could you please confirm if the following steps are correct in this case:

1. Power on the unit
2. Program the first passcode value from the ppt into the "REG_LOCK" register, ignore the NACK, via I2C writes
3. Program the second passcode value from the ppt into the "REG_LOCK" register, ignore the NACK, via I2C writes
4. At this point, the I2C read/write access will be fully unlocked and register accesses can proceed normally

I followed these steps but looks like at step #4 I still get I2C NACKs, will re-attempt, but please confirm if my understanding about the steps above is right

Thanks,

Anoop

Hi Anoop,

Yes, the steps are correct. Please let me know which register still got NACKed. I will double check.

Thanks,

Nancy

Hi Nancy,

Sure, I will be re-attempting this today and will let you know the observations

Thanks,

Anoop

Hi Nancy,

It seems like things are not working still. Register reads are working ok as expected. I intend to capture some scope snapshots of the I2C waveforms for further debug. If you want to take a look at it, is it OK to share the waveforms here (checking since the passcodes are supposed to be confidential) or do you want me to share the waveforms via direct chat or mail (if mail, kindly share your mail id)

Thanks,

Anoop

Hi Anoop,

Please share with me via my email at nancy_zhang@ti.com. We can discuss it offline. I will close this post.

Thanks,

Nancy