Texas Instruments BQ28Z610-R2 User Manual

16
1 2
1 2
{[ ] } /
2
CELL CELL
CELL CELL
V V
Cell Gain N
ADC ADC
= + ´
where N = number of cells.
8. Write the new Cell Gain value to data flash.
9. Recheck the voltage reading and if it is not accurate, repeat Steps 5 and 6.
10. Send 0x002D to MACSubcmd() to clear the [CAL_EN] flag if all calibration is complete.
11.2 VC2 (BAT) Voltage Calibration
VC
VSS
V
VC
2
2
This device does not have a BAT terminal and therefore the VC2 input is the BAT terminal:
1. Apply known voltages in mV to the voltage input:
• V
BAT
between VC2 terminal and VSS terminal
2. If ManufacturerStatus()[CAL_EN] = 0, send 0x002D to MACSubcmd() to enable the [CAL_EN] flag.
3. Send 0xF081 or 0xF082 to MACSubcmd() to enable raw cell voltage output on MACData().
4. Poll MACData() until the 8-bit counter value increments by 2 before reading data.
5. Read ADC conversion readings of cell stack voltage from MACData():
• ADC
BAT
= LLll of MACData()
6. Average several readings for higher accuracy. Poll MACData() until ZZ increments to indicate that updated
values are available:
• ADC
BAT
= [ADC
BAT
(reading n) + … + ADC
BAT
(reading 1)]/n
7. Calculate gain value:
16
2
BAT
BAT
V
BAT Gain
ADC
= ´
8. Write the new BAT Gain value to data flash.
9. Recheck the 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.
11.3 PACK Voltage Calibration
VSS
PACK
V
PACK
1. Apply known voltages in mV to the voltage input:
• V
PACK
between PACK terminal and VSS terminal
2. If ManufacturerStatus()[CAL_EN] = 0, send 0x002D to MACSubcmd() to enable the [CAL_EN] flag.
3. Send 0xF081 or 0xF082 to MACSubcmd() to enable raw cell voltage output on MACData().
4. Poll MACData() until the 8-bit counter value increments by 2 before reading data.
5. Read ADC conversion readings of pack voltage from MACData():
• ADC
PACK
= KKkk of MACData()
6. Average several readings for higher accuracy. Poll MACData() until ZZ increments to indicate that updated
values are available:
Calibration www.ti.com
60 BQ28Z610-R2 SLUUCO0 – APRIL 2022
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Texas Instruments BQ28Z610-R2 Specifications

General

Brand	Texas Instruments
Model	BQ28Z610-R2
Category	Computer Hardware
Language	English