BQ27542-G1: StateOfCharge in POR

Masayoshi Takahashi

Intellectual 1530 points

Part Number: BQ27542-G1

Hi team,

My customer would like to know whether the StateOfCharge() will change to default value or not in the event of POR.

(StateOfCharge() will change to 0% or defaultn or maintain?)

Could you please give your advice?

Regards,

Yoshi

over 5 years ago

0 Damian Lewis over 5 years ago

TI__Mastermind 34775 points

Hello Takahashi-san,

There's no such thing as a default SOC. When the gauge POR it's goes through an initialization process, which take about 2s. During this process the gauge simulates and recalculates SOC based on the present condition of the battery. It's recommended to wait about 5s before reading SOC after POR or exit from shutdown to ensure all gauging parameters are updated.

0 Masayoshi Takahashi over 5 years ago in reply to Damian Lewis

TI__Intellectual 1530 points

Hi Damian,

Thanks for your quick reply.

Before POR event, StateOfCharge value is stored to Flash. Is my understanding correct?

Regards,

Yoshi

0 Masayoshi Takahashi over 5 years ago in reply to Masayoshi Takahashi

TI__Intellectual 1530 points

Hi Damian,

Could you give me you answer please? I need the answer ASAP.

Regards,

Yoshi

0 Damian Lewis over 5 years ago in reply to Masayoshi Takahashi

TI__Mastermind 34775 points

Hi Yoshi,

That's incorrect. Why would the gauge store StateOfCharge in flash before POR. The gauge doesn't know how long it would be powered down and what happens to the battery in the powered down state. The gauge always on power up does an initialization to assess the present StateOfCharge. Until the initialization is complete any data in the StateOfCharge register is invalid and undetermined.

Power management

Power management forum

BQ27542-G1: StateOfCharge in POR