SLUUCF2 User guide

SLUUCF2C January 2021 – May 2022 BQ769142

4.5 Subcommands 0x0071–0x0074 DASTATUS1-4(), Cell Voltage and Synchronized Current Counts

The 0x0071 DASTATUS1(), 0x0072 DASTATUS2(), 0x0073 DASTATUS3(), and 0x0074 DASTATUS4() subcommands provide raw ADC counts in 32-bit format of the cell voltage measurements, as well as the synchronized current measurements taken simultaneously with each cell voltage measurement.

Note: Only the 24-bit raw data is generated by the data converters, but the data is provided in a 32-bit numerical format (the 24-bit data is contained in the lower three bytes of the 32-bit data, and is sign-extended to create the upper byte). The raw ADC data provided for cell-voltage measurements uses a digital fullscale range of ± (5 × VREF1), although cell voltage measurements more negative than –0.2 V cannot practically be measured. The raw coulomb counter ADC data provided for current measurements uses a digital fullscale range of ± (VREF2 / 5).

The 32-bit cell voltage counts data has an LSB value of approximately 5 × V_REF1 / 2²³ ≅ 5 × 1.212 V / 2²³ ≅ 0.722 μV.

Note: This data was not processed using the internal factory gain and offset trim corrections, which are used for calculation of the 16-bit data provided by the Cell # Voltage() commands.

The 32-bit current counts data has an LSB value of approximately V_REF2 / (5 × 2²³) ≅ 1.24 V / (5 × 2²³) ≅ 29.56 nV.

Note: This data was not processed for gain or offset, which are used for calculating the 16-bit current data provided by the CC2 Current() and CC3 Current() commands.

Table 5-4 provides further details.

Table 4-4 Cell Voltage and Synchronized Current Counts

Subcommand Address	Bytes within Block	Name	Unit
0x0071	0–3	Cell 1 Voltage Counts	ADC counts
	4–7	Cell 1 Current Counts	ADC counts
	8–11	Cell 2 Voltage Counts	ADC counts
	12–15	Cell 2 Current Counts	ADC counts
	16–19	Cell 3 Voltage Counts	ADC counts
	20–23	Cell 3 Current Counts	ADC counts
	24–27	Cell 4 Voltage Counts	ADC counts
	28–31	Cell 4 Current Counts	ADC counts
0x0072	0–3	Cell 5 Voltage Counts	ADC counts
	4–7	Cell 5 Current Counts	ADC counts
	8–11	Cell 6 Voltage Counts	ADC counts
	12–15	Cell 6 Current Counts	ADC counts
	16–19	Cell 7 Voltage Counts	ADC counts
	20–23	Cell 7 Current Counts	ADC counts
	24–27	Cell 8 Voltage Counts	ADC counts
	28–31	Cell 8 Current Counts	ADC counts
0x0073	0–3	Cell 9 Voltage Counts	ADC counts
	4–7	Cell 9 Current Counts	ADC counts
	8–11	Cell 10 Voltage Counts	ADC counts
	12–15	Cell10 Current Counts	ADC counts
	16–19	Cell 11 Voltage Counts	ADC counts
	20–23	Cell 11 Current Counts	ADC counts
	24–27	Cell 12 Voltage Counts	ADC counts
	28–31	Cell 12 Current Counts	ADC counts
0x0074	0–3	Reserved	—
	4–7	Reserved	—
	8–11	Cell 13 Voltage Counts	ADC counts
	12–15	Cell 13 Current Counts	ADC counts
	16–19	Reserved	—
	20–23	Reserved	—
	24–27	Cell 14 Voltage Counts	ADC counts
	28–31	Cell 14 Current Counts	ADC counts