BQ20Z75-V180: compliant to SBM 1.1 multi-master mode

John Garrett

Part Number: BQ20Z75-V180

Hi All,

I received the following email from a customer:

How are you? I am hardware engineer from... We are using TI gas gauge IC (bq20z75-v180) in all of our Li-ion battery

We have the battery connecting to our battery charger IC which is I2C (SMB) slave device and also connecting to microcontroller (multi-master mode device). Can you ask your colleague to check if bq20z75-v180 is compliant to SBM 1.1 multi-master mode that will detect on-going bus traffic without interrupting? Or is the IC a single master mode?

Please let me know.

Thanks, John Garrett TI-AFA

over 7 years ago

0 Onyx Ahiakwo over 7 years ago

TI__Guru* 76230 points

hi John
Bq20z75 doesn't support multi master mode.
thanks
Onyx

0 John Garrett over 7 years ago in reply to Onyx Ahiakwo

TI__Expert 4220 points

Thanks Onyx,

One follow-up question:

Since the bq20z75 does not support multi master mode, I believe it will not check if SMB bus is busy or not and broadcast on the SMB bus whenever it needs to communicate with charger IC on the host product. Please confirm.

In parallel I can check with the customer to see if they have any issue disabling the broadcast mode and just pinging the battery gauge from a single master.

Thanks again, John Garrett, TI AFA

0 Onyx Ahiakwo over 7 years ago in reply to John Garrett

TI__Guru* 76230 points

The bq20z75 can support being a temporary master by taking control of the clock lines and broadcast charge current and voltage to a smart charger.
thanks
Onyx

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BQ20Z75-V180: compliant to SBM 1.1 multi-master mode