BQ34Z100-G1: BQ34Z100-G1 and 100 mOhm current sensing resistor

Tomasz Ciesla

Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQSTUDIO

hi, I'm starting to configure BQ34Z100-G1 using Battery Management Studio. I use 100 mOhm current sense resistor, in the SW I can't type this value in CC delta (limit is 40 mOhm), should I keep default 10 mOhm and run calibration?

In my application I'm using BQ34Z100-G1 for fuel gauging 1 AA NiMH cell. Device maximum operating current: 300 mA and charging current: ~600 mA, I'm using 100 mOhm to improve accuracy of current sensing.

over 4 years ago

+1 Wyatt Keller over 4 years ago

TI__Guru** 105590 points

Hello,

You can follow the calibration guide on the EVM users guide. You must apply a set current (usually around 2A) and calibrate at that value. The CC values will be calculated in bqStudio and programmed to the gauge.

Sincerely,

Wyatt Keller

0 Tomasz Ciesla over 4 years ago in reply to Wyatt Keller

Intellectual 690 points

I did set Rsense to 10 mOhm and did calibration with full range of the PCB design (~900 mA) the chip calculates correct current's value

0 Wyatt Keller over 4 years ago in reply to Tomasz Ciesla

TI__Guru** 105590 points

Hello,

Glad to hear you got it working!

Sincerely,

Wyatt Keller

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BQ34Z100-G1: BQ34Z100-G1 and 100 mOhm current sensing resistor