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[FAQ] BQ34Z100-G1: Current/Capacity Scaling

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

The gauge can support charge and discharge currents up to 32 767 mA if you want to scale the current with a desired scale, the scale must between 1 to 10 for optimal accuracy. The SCALED bit in pack configuration should be set. The SCALED bit only signals to the host that the data for current and capacity are not the true value and need to be rescaled upon reading. Then you need to calibrate the current according to the expected scale factor. For, example if you use a scale of 5, they you can calibrate the gauge with a 5A actual current then calibrate it to 1A in BQstudio. It is host's responsibility to interpret the read values. It is not necessary to scale capacity and current at the same time unless capacity exceeds the gauge rating.

If both values exceed gauge ratings then scaling must be considered for both packs. The scale factor must be calculated for both parameters and the largest scale factor is used for both parameters.

For example, if the maximum pack capacity is 90Ah, then the scale factor is set to 90 000 mAh / 29 000 mAh = 3.10x or rounded up to 4x. All current and capacity parameters in the data flash are divided by 4x.