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BQ28Z610-R1

SLUSE07 – JANUARY 2020

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Device Functional Modes (continued)

8.4.2.2 Cell Voltage Measurements

The BQ28Z610-R1 measures the individual cell voltages at 250-ms intervals using an ADC. This measured value

is internally scaled for the ADC and is calibrated to reduce any errors due to offsets. This data is also used for

calculating the impedance of the individual cell for Impedance Track gas gauging.

8.4.2.3 Current Measurements

The current measurement is performed by measuring the voltage drop across the external sense resistor (1 mΩ

to 3 mΩ) and the polarity of the differential voltage determines if the cell is in the CHARGE or DISCHARGE

mode.

8.4.2.4 Auto Calibration

The auto-calibration feature helps to cancel any voltage offset across the SRP and SRN pins for accurate

measurement of the cell voltage, charge/discharge current, and thermistor temperature. The auto-calibration is

performed when there is no communication activity for a minimum of 5 s on the bus lines.

8.4.2.5 Temperature Measurements

This device has an internal sensor for on-die temperature measurements, and the ability to support external

temperature measurements via the external NTC on the TS1 pin. These two measurements are individually

enabled and configured.