Texas Instruments provides a recommended PCB layout in the datasheet, but it's essential to follow good design practices, such as keeping the battery connections short and wide, using a solid ground plane, and placing the IC close to the battery. Additionally, ensure that the PCB layout is symmetrical to minimize noise and EMI.
Calibration is crucial for accurate state-of-charge (SOC) estimation. TI provides a calibration guide in the datasheet, which involves measuring the battery's capacity, internal resistance, and open-circuit voltage. You can also use TI's Fuel Gauge Calibration Tool to simplify the process.
Temperature affects the battery's characteristics, which in turn affect the fuel gauge's accuracy. The BQ20Z90DBT-V110 has a built-in temperature sensor, but it's essential to consider temperature compensation during calibration. TI provides temperature correction factors in the datasheet to help improve accuracy.
Yes, the BQ20Z90DBT-V110 supports multiple battery chemistries, including Li-ion, Li-polymer, and NiMH. However, you'll need to adjust the calibration settings and compensation factors according to the specific battery chemistry used.
The BQ20Z90DBT-V110 has a built-in mechanism to track battery capacity loss over time. You can use the device's learning cycle feature to update the battery's capacity and internal resistance values. Additionally, TI provides guidelines for implementing battery aging compensation in the datasheet.
BQ20Z90DBT-V110 datasheet
by Texas Instruments
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