4.14 Charge Suspend............................................................................................................................................................ 29
5 Power Modes.........................................................................................................................................................................31
5.1 Introduction...................................................................................................................................................................... 31
5.2 NORMAL Mode................................................................................................................................................................31
5.3 SLEEP Mode....................................................................................................................................................................31
5.3.1 Device Sleep............................................................................................................................................................. 31
5.3.2 IN SYSTEM SLEEP Mode.........................................................................................................................................31
5.3.3 MACSubcmd() MAC Sleep........................................................................................................................................32
5.3.4 Wake Function...........................................................................................................................................................32
5.4 SHUTDOWN Mode.......................................................................................................................................................... 32
5.4.1 Voltage Based Shutdown.......................................................................................................................................... 32
5.4.2 MACSubcmd() MAC Shutdown................................................................................................................................. 32
5.4.3 Time Based Shutdown...............................................................................................................................................33
5.4.4 Emergency FET Shutdown........................................................................................................................................33
6 Gauging................................................................................................................................................................................. 35
6.1 Introduction...................................................................................................................................................................... 35
6.2 Impedance Track Configuration....................................................................................................................................... 35
6.3 Gas Gauge Modes...........................................................................................................................................................36
6.4 QMax and Ra...................................................................................................................................................................38
6.4.1 QMax Initial Values....................................................................................................................................................39
6.4.2 QMax Update Conditions.......................................................................................................................................... 39
6.4.3 Fast QMax Update Conditions.................................................................................................................................. 39
6.4.4 QMax and Fast QMax Update Boundary Check....................................................................................................... 40
6.4.5 Ra Table Initial Values............................................................................................................................................... 40
6.4.6 Ra Table Update Conditions......................................................................................................................................40
6.5 FullChargeCapacity (FCC), RemainingCapacity (RemCap), and RelativeStateOfCharge (RSOC)................................ 41
6.6 Impedance Track (IT) Configuration Options................................................................................................................... 41
6.7 State-of-Health (SOH)......................................................................................................................................................42
7 Cell Balancing.......................................................................................................................................................................43
7.1 Introduction...................................................................................................................................................................... 43
7.2 Cell Balancing Setup........................................................................................................................................................43
7.3 Cell Balancing Operation................................................................................................................................................. 47
8 Lifetime Data Collection.......................................................................................................................................................51
8.1 Description....................................................................................................................................................................... 51
9 Device Security.....................................................................................................................................................................53
9.1 Description....................................................................................................................................................................... 53
9.2 SHA-1 Description............................................................................................................................................................53
9.3 HMAC Description............................................................................................................................................................53
9.4 Authentication.................................................................................................................................................................. 54
9.5 Security Modes................................................................................................................................................................ 54
9.5.1 SEALING and UNSEALING Data Flash....................................................................................................................54
9.5.2 SEALED to UNSEALED............................................................................................................................................ 55
9.5.3 UNSEALED to FULL ACCESS..................................................................................................................................55
10 Manufacture Production.....................................................................................................................................................57
10.1 Manufacture Testing.......................................................................................................................................................57
10.2 Calibration......................................................................................................................................................................57
11 Calibration........................................................................................................................................................................... 59
11.1 Cell Voltage Calibration.................................................................................................................................................. 59
11.2 VC2 (BAT) Voltage Calibration....................................................................................................................................... 60
11.3 PACK Voltage Calibration...............................................................................................................................................60
11.4 Current Calibration......................................................................................................................................................... 61
11.4.1 CC Offset Calibration...............................................................................................................................................61
11.4.2 Board Offset Calibration...........................................................................................................................................62
11.4.3 CC Gain/Capacity Gain Calibration......................................................................................................................... 62
11.5 Temperature Calibration................................................................................................................................................. 63
11.5.1 Internal Temperature Sensor Calibration................................................................................................................. 63
11.5.2 TS1 Calibration........................................................................................................................................................ 63
12 I2C Commands....................................................................................................................................................................65
12.1 Standard Data Commands.............................................................................................................................................65
12.1.1 0x00/01 ManufacturerAccess() and ControlStatus()............................................................................................... 66
12.1.2 0x02/03 AtRate()..................................................................................................................................................... 67
Table of Contents www.ti.com
4 BQ28Z610-R2 SLUUCO0 – APRIL 2022
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