BQ34Z100-G1: in-accuracy in voltage reading

Ran Aloni

Expert 2365 points

Part Number: BQ34Z100-G1

Dear all,

I'm using the BQ34Z100-G1 to gauge a 36V battery.

to the advice of the EVM, I chose a resistor divider of 0.027 (600K to a 16.5K resistor ).

I'm getting this voltage variation:

can you please advice me how to solve it? since the calibration is good for lower voltage...

attached the schematics as well.

DAN_GAUGE_A1.pdf

Ran

over 5 years ago

0 Bryan Kahler over 5 years ago

TI__Mastermind 25955 points

Hi Ran,

When you performed voltage calibration, was voltage was utilized? If a smaller voltage was utilized, please use a power supply capable of 36 V and follow the steps shown in this video: https://training.ti.com/bq34z100-g1-voltage-calibration

If this doesn't provide you with better results, What is the % accuracy and PPM of the resistors use in the resistive divider? Is the circuit heating up?

Sincerely,
Bryan Kahler

Find out more about the BQ34Z100-G1 including technical documents and tools/software/firmware and frequently asked questions. Refer to the quickstart guide to get up and started. Also, learn how to find your chemID and perform voltage and current calibration.

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BQ34Z100-G1: in-accuracy in voltage reading