BQ35100: BQ35100

NANDHINI S

Part Number: BQ35100

Hi sir,

In our current design , we are using "BQ35100PW" battery monitor IC ,interface with STM32L5 controller using I2C .

Currently we are checking the battery charge( LiSOCL2 primary battery cell used for power) in accumulator mode,

we set GE-High, opconfig---0x03, battery capacity---3600mAh, cell voltage-3.6V. As per understanding when battery is full, it should give 3600mAh in accumulator mode but we are getting the vale" 4076863488 uAh" ,

Please help us to solve the issue.

over 1 year ago

0 Wyatt Keller over 1 year ago

TI__Guru** 105590 points

Hello,

The register tracks both negative and positive charge, it sounds like you may have done some slight charging to cause the counter to roll-over. The accumulated capacity does not start at your design capacity, it starts at 0mAh and increases from there based on the passed charge.

Sincerely,

Wyatt Keller

0 NANDHINI S over 1 year ago in reply to Wyatt Keller

Prodigy 60 points

Hi sir,

we are using non rechargeable primary cell(LS1700) , In the SW, we sent NEW_BATTERY() command to BQ35100 and then read the accumulated register which is giving huge vale not zero and its decreasing gradually from "4076863488 uAh"

Thank you

0 NANDHINI S over 1 year ago in reply to Wyatt Keller

Prodigy 60 points

Hisir,

We are getting 0uAh current at accumulated mode, no change in current and charge, please let me know to solve the issue.

0 Wyatt Keller over 1 year ago in reply to NANDHINI S

TI__Guru** 105590 points

Hello,

Please make sure there is no charge occurring when you send the new battery command, otherwise the accumulation may roll-over.

Sincerely,

Wyatt Keller

0 NANDHINI S over 1 year ago in reply to Wyatt Keller

Prodigy 60 points

Hi ,

Yes, there is no accumulated capacity and current occurring, getting only battery voltage 3.6V, current is 0. Please help me resolve this

0 Wyatt Keller over 1 year ago in reply to NANDHINI S

TI__Guru** 105590 points

Hello,

The gauge may not report current but the accumulated capacity measurement is very sensitive and could roll-over from a small offset if you are enabling the counter without any current flowing. Please ensure the gauge is calibrated for offsets and turn on the accumulation when there is a discharge event.

Sincerely,

Wyatt Keller

Power management

Power management forum

BQ35100: BQ35100