• ADC
PACK
= [ADC
PACK
(reading n) + … + ADC
PACK
(reading 1)]/n
7. Calculate gain value:
16
2
PACK
PACK
V
PACK Gain
ADC
= ´
8. Write the new PACK Gain value to data flash.
9. Recheck voltage readings and if they are not accurate, repeat Steps 4 through 6.
10. Send 0x002D to MACSubcmd() to clear the [CAL_EN] flag if all calibration is complete.
11.4 Current Calibration
11.4.1 CC Offset Calibration
Note
Because of hardware improvements in this device, CC Offset Calibration is not necessary. Only run
the CC Offset Calibration procedure if offset current is observed.
1. Apply a known current of 0 mA, and ensure no current is flowing through the sense resistor connected
between the SRP and SRN pins.
2. If ManufacturerStatus()[CAL_EN] = 0, send 0x002D to MACSubcmd() to enable the [CAL_EN] flag.
3. Send 0xF082 to MACSubcmd() to enable raw cell voltage output on MACData().
4. Poll MACData() until ZZ increments by 2 before reading data.
5. Obtain the ADC conversion readings of current from MACData():
• ADC
CC
= AAaa of MACData()
Is ADC
CC
< 0x8000? If yes, use ADC
CC
; otherwise, ADC
CC
= –(0xFFFF – AAaa + 0x0001).
6. Average several readings for higher accuracy. Poll MACData() until ZZ increments to indicate that updated
values are available:
• ADC
CC
= [ADC
CC
(reading n) + … + ADC
CC
(reading 1)]/n
7. Read Coulomb Counter Offset Samples from data flash.
www.ti.com Calibration
SLUUCO0 – APRIL 2022
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BQ28Z610-R2 61
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