BQ35100: srp srn direction

Shoo Saga

Intellectual 2691 points

Part Number: BQ35100

Hi team,

Is it ok to connect srp to Pack-, vice verca?

Regards,

Shoo

over 1 year ago

+1 Adrian over 1 year ago

TI__Mastermind 37761 points

Hello Shoo,

No, it is recommended to connect SRN to Pack-.

Sincerely,
Nick Richards

0 Shoo Saga over 1 year ago in reply to Adrian

TI__Intellectual 2691 points

Hello Nick,

GNDSEL (Bit 2) in Operation Config A can enable the use of SRN as GND for the ADC conversions. and ADC renge is -0.125 to 0.125.

Is there any concern if we set SRN as GND?

Regards,

Shoo

+1 Adrian over 1 year ago in reply to Shoo Saga

TI__Mastermind 37761 points

Hello Shoo,

No, it is perfectly fine to have SRN as GND.

Sincerely,
Nick Richards

0 Shoo Saga over 1 year ago in reply to Adrian

TI__Intellectual 2691 points

Hi Nick,

in accumulator mode, If current register is minus, It doesn't affect AccumulatedCapacity()?

Regards,

Shoo

+1 Adrian over 1 year ago in reply to Shoo Saga

TI__Mastermind 37761 points

Hey Shoo,

When in accumulator mode, the Accumulated Capacity register is increasing when the battery is discharging. The increase is based on the coulomb counter.

Sincerely,
Nick Richards

0 Shoo Saga over 1 year ago in reply to Adrian

TI__Intellectual 2691 points

Hi Nick,

Possibly the Accumulated Capacity register is decreasing ?

Regards,

Shoo

0 Adrian over 1 year ago in reply to Shoo Saga

TI__Mastermind 37761 points

Hey Shoo,

No, the Accumulated Capacity register should not decrease. So the register is increasing when the battery is discharging. Therefore, when the battery is charging the register should decrease. However, this gauge is to be used only with primary (non-rechargeable) batteries. Therefore, the battery should never be charged thus the Accumulated Capacity register should never decrease.

Sincerely,
Nick Richards

0 Shoo Saga over 1 year ago in reply to Adrian

TI__Intellectual 2691 points

Hi Nick,

I mean if the small reverse current happen,

the Accumulated Capacity register would be decreasing ? bcz they are capaple of detecting charging current which means avg current register can have minus value.

My customer concern it might affect the measurement accuracy and it shouldn't have minus value.

Do you know the reason why this device can detect charging current? using same IP as rechargable battery?

regards,

Shoo.

+1 Adrian over 1 year ago in reply to Shoo Saga

TI__Mastermind 37761 points

Hello Shoo,

Yes, it uses the same IP as rechargeable batteries and yes, if there is a charge current then the register would decrease. However, if it is just very small reverse current for a short period of time then it would have a very minimum affect on measurement accuracy, which should not be a concern for a non-regular occurrence of reverse current.

Sincerely,
Nick Richards

Power management

Power management forum

BQ35100: srp srn direction