Question about a calibration bq20z90 (and other)

Vladimir5

Other Parts Discussed in Thread: BQ20Z90

Dear TI specialists, please tell me in which the document can be found the describtion of additional commands and registers that are used to calibrate the voltage, current and other parameters?
I have carefully examined almost all available documents for bq20z90, but other than a short mention about CalibrateAll () and CalibrateBoardOffset (), I found nothing.
I'm interested in the description of the command: 0x40, 0x41, 0x42, 0x50, 0x51, 0x52, 0x53 and "Coulomb Counter config register".

My e-mail for feedback: vvg@skyline.od.ua

over 11 years ago

0 Vladimir5 over 11 years ago

Intellectual 380 points

Hi.

To accomplish a procedure "Software Board Offset Calibration" need to read Coulomb Counter several times.
Result may differ by 1 - 20 units.

Why there is such a big difference?

0 Onyx Ahiakwo over 11 years ago in reply to Vladimir5

TI__Guru* 76230 points

Can you clarify on what you mean results differ by 1-20 units.

0 Vladimir5 over 11 years ago in reply to Onyx Ahiakwo

Intellectual 380 points

    lerror = WriteSMBusWord(&H40, &H8042) '//Set address of Coulomb Counter
    lerror = ReadSMBusWord(&H42, iExternalOffset1) '// Peek Coulomb Counter  'iExternalOffset
    lerror = WriteSMBusWord(&H40, &H8042) '//Set address of Coulomb Counter
    lerror = ReadSMBusWord(&H42, iExternalOffset2) '// Peek Coulomb Counter  'iExternalOffset
'*******
    lerror = WriteSMBusWord(&H40, &H8042) '//Set address of Coulomb Counter
    lerror = ReadSMBusWord(&H42, iExternalOffset4) '// Peek Coulomb Counter  'iExternalOffset

iExternalOffset1 <> iExternalOffset2 <> iExternalOffset4
These values differ by 1-20 units.

What value the difference can be maximally acceptable for the true parameter ?

0 Onyx Ahiakwo over 11 years ago in reply to Vladimir5

TI__Guru* 76230 points

Hi Vladimir,

As long as temperature is reported correctly, there is no need to worry about the offset value.

thanks

Onyx

0 Vladimir5 over 11 years ago in reply to Onyx Ahiakwo

Intellectual 380 points

Thank you.

I've managed to find out that the difference the read value ( iExternalOffset ) must not exceed 3 units.

Vladimir.

Power management

Power management forum

Question about a calibration bq20z90 (and other)