BQ25730: I2C functionality

Hanno Reimer

Intellectual 2140 points

Part Number: BQ25730
Other Parts Discussed in Thread: TPS25750

for BQ25730:

Battery charging status via I2S readable?
Charge current on the fly adjustable?

over 3 years ago

0 Jeff F over 3 years ago

TI__Guru**** 181076 points

Hi Hanno,

Yes to both. Please see the register map below:

Regards,

Jeff

0 Hanno Reimer over 3 years ago in reply to Jeff F

TI__Intellectual 2140 points

Hi Jeff,

Thanks for the fast respond!

What is the meaning of charger status? Is it possible to check the level of the battery loading, e.g. 80%?

ciao

Hanno

0 Jeff F over 3 years ago in reply to Hanno Reimer

TI__Guru**** 181076 points

Hi Hanno,

Charger status is whether the battery is still charging or terminated. The charger does not provide a gauging function that reports % full. However, there is an ADC to report instantaneous battery voltage.

Regards,

Jeff

0 Hanno Reimer over 3 years ago in reply to Jeff F

TI__Intellectual 2140 points

OK! I assume, that an external MCU could do a rough gauging estimation, by knowing the defined charging current and the charging time by regularly checking the charger status, right?

Thanks and bye

Hanno

+1 Jeff F over 3 years ago in reply to Hanno Reimer

TI__Guru**** 181076 points

Hi Hanno,

Yes. Some customers do that.

Regards,

Jeff

0 Jonathan Müller-Boruttau over 3 years ago

Prodigy 20 points

Hi Hanno, Jeff,

since I think that question was in regards to a talk we had I maybe should clarify a bit. We want to use a TPS25750 to handle all USB PD communication and to act mostly autonomously. However during runtime, we may want to change charging current and final charging voltage along with activating or deactivating USB Sourcing (powerbank mode). We'd also like to read the battery voltage and current. Is this still possible when using the TPS25750 "in between" MCU an BQ or should we also have a direct connection from MCU to the BQ I2C interface?

Thanks and Regards,
Jonathan

Power management

Power management forum

BQ25730: I2C functionality