BQ34Z950 Sealed

Aizat Hashim96

Intellectual 265 points

Other Parts Discussed in Thread: BQ34Z950, BQ29330

Dear TI,

I've recently Sealed a fresh BQ34Z950 IC but I didn't note down the UnSealKey from the device to Unseal it.

Is there any way that I can Unseal this IC? Or is there any default UnSealKey for a fresh IC?

Thanks in advanced.

over 8 years ago

0 jury noname over 8 years ago

Intellectual 765 points

>Or is there any default UnSealKey for a fresh IC?
Read from manual (bq34z950 + bq29330 Technical Reference Manual):
"The unseal key can be read and changed via the extended SBS block command UnSealKey when in FULL ACCESS mode."

PS The bq34z950 is shipped from TI in FULL ACCESS mode..

0 ThomasCosby over 8 years ago in reply to jury noname

TI__Guru 73830 points

The default unseal codes are 0414 3672 and the default full access codes are ffff ffff. The codes will not work if the user has changed them.

0 Aizat Hashim96 over 8 years ago in reply to ThomasCosby

Intellectual 265 points

Thomas,

Thanks for the given answer above. Now I've Unsealed the fresh IC from Sealed mode.

I've another question:

Using the same IC, after I disconnect the Pack+ pin which was at 16V and reconnect it back (same at 16V), the IC is back to Seal mode. The [FAS] and [SS] flag are turned to red (set).

At this stage, I just want to power up the IC thus no battery or battery simulator connected to the IC.

Is it normal that the IC behaviors like this with the condition above?

0 ThomasCosby over 8 years ago in reply to Aizat Hashim96

TI__Guru 73830 points

The device will reseal automatically, if it gets reset. Removing reapplying the voltage would cause a power-up reset.

Power management

Power management forum

BQ34Z950 Sealed