SLUUDA0A
April 2026 – July 2026
BQ27Z855
1
Read This First
About This Manual
Notational Conventions
Battery Notational Conventions
Trademarks
Glossary
1
IO Options
1.1
Configuration of the INT Pin
2
Basic Measurement System
2.1
Introduction
2.2
Current and Coulomb Counting
2.3
Voltage
2.3.1
Cell Voltage
2.3.2
Pack Voltage
2.4
Temperature
2.4.1
Internal Temperature
2.4.2
Cell Temperature
2.4.3
Temperature Configuration
3
Protections
3.1
Introduction
3.2
Cell Undervoltage Protection
3.3
Cell Undervoltage Compensated Protection
3.4
Cell Overvoltage Protection
3.5
Overcurrent in Charge Protection
3.6
Overcurrent in Discharge Protection
3.7
Hardware-Based Protection
3.7.1
Analog Over Current Charge Protection (AOCC)
3.7.2
Analog Over Current Discharge Protection (AOCD)
3.7.3
Short Circuit in Discharge Protection
3.7.4
ACUV (Cell Under Voltage)
3.7.5
ACOV (Cell Over Voltage)
3.8
Temperature Protections
3.8.1
Overtemperature in Charge Protection
3.8.2
Overtemperature in Discharge Protection
3.8.3
Overtemperature FET Protection
3.8.4
Undertemperature in Charge Protection
3.8.5
Undertemperature in Discharge Protection
3.9
Host Watchdog Protection
3.10
Precharge Timeout Protection
3.11
Fast Charge Timeout Protection
3.12
Overcharge Protection
3.13
OverCharging Voltage Protection
3.14
OverCharging Current Protection
3.15
OverPrecharging Current Protection
4
Integrated Short-Circuit Indication (ISI)
4.1
Introduction
4.2
Configuration
4.2.1
Self-Discharge Current
4.2.2
Low Internal Short Threshold
4.2.3
High Internal Short Threshold
4.2.4
Threshold Passes to Completion
4.2.5
Manufacturing Completion Timeout
4.3
ISI Configuration Parameters
4.3.1
ISI Configuration
4.3.2
ISI Configuration
5
Permanent Fail
5.1
Introduction
5.1.1
Black Box Recorder
5.2
Safety Cell Undervoltage Permanent Fail
5.2.1
SUV Check Option
5.3
Safety Cell Overvoltage Permanent Fail
5.4
Safety Overcurrent in Charge Permanent Fail
5.5
Safety Overcurrent in Discharge Permanent Fail
5.6
Safety Overtemperature Cell Permanent Fail
5.7
Safety Overtemperature FET Permanent Fail
5.8
Capacity Degradation Permanent Fail
5.9
Charge FET Permanent Fail
5.10
Discharge FET Permanent Fail
5.11
Battery Swelling Detection Permanent Fail
5.12
Data Flash (DF) Permanent Fail
5.13
Cell Overvoltage Latch Permanent Failure
5.14
Manual Permanent Failure
5.15
Permanent Fail ISI
5.16
Internal Short-Circuit Indication Low Permanent Fail
5.17
Internal Short-Circuit Indication High Permanent Fail
6
Power Modes
6.1
NORMAL Mode
6.1.1
System Present Detection Configuration
6.1.1.1
System Present
6.1.1.2
Battery Pack Removed
6.2
SLEEP Mode
6.2.1
Device Sleep
6.2.2
IN SYSTEM SLEEP Mode
6.2.3
ManufacturerAccess() MAC Sleep
6.2.4
Current Wake Function
6.3
SHIP Mode
6.4
SHELF Mode
6.5
SHUTDOWN Mode
6.5.1
VOLTAGE BASED SHUTDOWN
6.5.2
ManufacturerAccess() MAC Shutdown
6.5.3
Time-Based Shutdown
6.5.4
Low RSOC Time-Based Shutdown
6.5.5
Power Save Shutdown
6.5.6
IO Based Shutdown
6.6
Startup ENAB Hold Time
6.7
Option to Manage Unintended Wakeup from Shutdown
6.8
Emergency FET Shutdown (EMSHUT)
6.8.1
Enter Emergency FET Shutdown Through SHUTDN
6.8.2
Enter Emergency FET Shutdown Through MFC
6.8.3
Exit Emergency FET Shutdown
6.9
STORAGE Mode
6.10
System Disconnect
7
Gauging
7.1
Introduction
7.2
Dynamic Z-Track Configuration
7.3
Gas Gauge Modes
7.4
QMax and Ra
7.4.1
QMax Initial Values
7.4.2
QMax Update Conditions
7.4.3
OCV Prediction
7.4.4
Fast Qmax Update Conditions
7.4.5
QMax and Fast Qmax Update Boundary Check
7.4.6
Ra Table Initial Values
7.4.7
Ra Table Update Conditions
7.4.8
Application of Resistance Scaling
7.5
FullChargeCapacity(FCC), RemainingCapacity(RemCap), and RelativeStateOfCharge(RSOC)
7.6
Dynamic Z-Track Configuration Options
7.7
State of Health (SOH)
7.8
RSOC Rounding Option
7.9
RSOC 1% Hold
7.10
Accumulated Charge Measurement
8
Gauging for Silicon Anode Battery
8.1
Introduction
8.2
Capacity Loss And OCV Drift
8.3
Silicon Anode Battery Gauging
8.4
Silicon Anode Gauging Parameters
8.5
Design Qmax
8.6
ManufacturerAccess() 0x0040 SiAnode Status
8.7
ZT SiAnode Gauging Configuration
9
Lifetime Data Collection
9.1
Description
9.2
Reset
10
Linear Charging Functions
10.1
Introduction
10.2
Charger Detect (CHGR_DET) Functionality
10.3
CHG FET FSM and Mode-to-mode Switching (Linear Charger Modes)
10.4
Linear Charge Profile
11
Charge Current Derating
12
Charge Current Derating Data Flash Parameters
13
Host Interrupts
13.1
Description
13.2
Host Interrupts Configuration
14
Device Security
14.1
Description
14.2
SHA-256 Authentication
14.2.1
Authentication Flow
14.3
Security Modes
14.3.1
SEALING and UNSEALING Data Flash
14.3.2
SEALED to UNSEALED
14.3.3
UNSEALED to FULL ACCESS
15
ECC
15.1
Introduction
15.2
Gauge Authentication
15.3
ECC MAC Commands Description
16
Advanced Charge Algorithm
16.1
Introduction
16.2
Charge Temperature Ranges
16.3
Voltage Range
16.3.1
Voltage or RelativeStateofCharge() Range
16.4
Charging Current
16.5
Charging Voltage
16.6
Valid Charge Termination
16.7
Charge and Discharge Termination Flags
16.8
Terminate Charge and Discharge Alarms
16.9
Zero Volt Charging (ZVCHG)
16.10
Precharge
16.11
Maintenance Charge
16.12
Charge Disabled
16.13
Charge Inhibit
16.14
Charge Suspend
16.15
ChargingVoltage() Rate of Change
16.16
ChargingCurrent() Rate of Change
16.17
Charging Loss Compensation
16.18
Cycle Count/SOH Based Degradation of Charging Voltage and Current
16.18.1
Degradation Modes
16.18.1.1
Cycle Count Based Degradation
16.18.1.2
SOH Based Degradation
16.18.1.3
Runtime Based Degradation
16.18.2
Degradation Process
16.18.2.1
Charging Voltage Degradation Process
16.18.2.2
Charging Current Degradation Process
16.19
Elevated Charge Degradation
16.20
Elevated Voltage Extended Charge Degradation
16.21
Charge Voltage Compensation for System Impedance
16.22
Cell Swelling Control (via Charging Voltage Degradation)
17
Communications
17.1
I2C Interface
17.1.1
I2C Clock Frequency
17.1.2
I2C Time Out
17.1.3
I2C Command Waiting Time
17.1.4
I2C Clock Stretching
18
Calibration
18.1
Voltage Calibration
18.1.1
Cell (BAT) Voltage Calibration
18.1.2
Pack (PACK) Voltage Calibration
18.1.3
Voltage Calibration Data Flash
18.2
Current Calibration
18.2.1
CC Gain/Capacity Gain Calibration
18.2.2
Deadbands
18.2.2.1
Current Deadband
18.2.2.2
Coulomb Counter Deadband
18.2.3
Current Calibration Data Flash
18.3
Temperature Calibration
18.3.1
TS Calibration
18.3.2
Temperature Calibration Data Flash
18.3.3
Cell Temp Model
18.3.4
Internal Temp Model
19
Data Commands
19.1
Standard Data Commands
19.1.1
0x00/01 ManufacturerAccess()/ControlStatus()
19.1.2
0x02/03 AtRate()
19.1.3
0x04/05 AtRateTimeToEmpty()
19.1.4
0x06/07 Temperature()
19.1.5
0x08/09 Voltage()
19.1.6
0x0A/0B BatteryStatus()
19.1.7
0x0C/0D Current()
19.1.8
0x10/11 RemainingCapacity()
19.1.9
0x12/13 FullChargeCapacity()
19.1.10
0x14/15 AverageCurrent()
19.1.11
0x16/17 AverageTimeToEmpty()
19.1.12
0x18/19 AverageTimeToFull()
19.1.13
0x20/21 MaxLoadTimeToEmpty()
19.1.14
0x22/23 AveragePower()
19.1.15
0x28/29 InternalTemperature()
19.1.16
0x2A/2B CycleCount()
19.1.17
0x2C/2D RelativeStateOfCharge()—RSOC
19.1.18
0x2E/2F StateOfHealth()
19.1.19
0x30/31 ChargingVoltage()
19.1.20
0x32/33 ChargingCurrent()
19.1.21
0x34/35 TerminateVoltage()
19.1.22
0x36/0x37/0x38/0x39 Timestamp()
19.1.23
QMax Cycles() 0x3A/3B
19.1.24
0x3C/3D DesignCapacity()
19.1.25
0x3E/3F AltManufacturerAccess()
19.1.26
0x40/0x5F MACData()
19.1.27
0x60 MACDataChecksum()
19.1.28
0x61 MACDataLength()
19.2
0x00, 0x01 ManufacturerAccess() and 0x3E, 0x3F AltManufacturerAccess()
19.2.1
ManufacturerAccess() 0x0000
19.2.2
ManufacturerAccess() 0x0001 Device Type
19.2.3
ManufacturerAccess() 0x0002 Firmware Version
19.2.4
ManufacturerAccess() 0x0003 Hardware Version
19.2.5
ManufacturerAccess() 0x0004 Instruction Flash Signature
19.2.6
ManufacturerAccess() 0x0005 Static DF Signature
19.2.7
ManufacturerAccess() 0x0006 Chemical ID
19.2.8
ManufacturerAccess() 0x0008 Static Chem DF Signature
19.2.9
ManufacturerAccess() 0x0009 All DF Signature
19.2.10
ManufacturerAccess() 0x000A STORAGE Mode
19.2.11
ManufacturerAccess() 0x0010 SHUTDOWN Mode
19.2.12
ManufacturerAccess() 0x0011 SLEEP Mode
19.2.13
ManufacturerAccess() 0x001F CHG FET Toggle
19.2.14
ManufacturerAccess() 0x0020 DSG FET Toggle
19.2.15
ManufacturerAccess() 0x0021 Gauging
19.2.16
ManufacturerAccess() 0x0022 FET Control
19.2.17
ManufacturerAccess() 0x0023 Lifetime Data Collection
19.2.18
ManufacturerAccess() 0x0024 Permanent Failure
19.2.19
ManufacturerAccess() 0x0025 Black Box Recorder
19.2.20
ManufacturerAccess() 0x0028 Lifetime Data Reset
19.2.21
ManufacturerAccess() 0x0029 Permanent Fail Data Reset
19.2.22
ManufacturerAccess() 0x002A Black Box Recorder Reset
19.2.23
ManufacturerAccess() 0x002D CALIBRATION Mode
19.2.24
ManufacturerAccess() 0x002E Lifetime Data Flush
19.2.25
ManufacturerAccess() 0x002F Lifetime Data SPEED UP Mode
19.2.26
ManufacturerAccess() 0x0030 Seal Device
19.2.27
ManufacturerAccess() 0x0035 Security Keys
19.2.28
ManufacturerAccess() 0x0037 Authentication Key
19.2.29
ManufacturerAccess() 0x0041 Device Reset
19.2.30
ManufacturerAccess() 0x0050 SafetyAlert
19.2.31
ManufacturerAccess() 0x0051 SafetyStatus
19.2.32
ManufacturerAccess() 0x0052 PFAlert
19.2.33
ManufacturerAccess() 0x0053 PFStatus
19.2.34
ManufacturerAccess() 0x0054 OperationStatus
19.2.35
ManufacturerAccess() 0x0055 ChargingStatus
19.2.36
ManufacturerAccess() 0x0056 GaugingStatus
19.2.37
ManufacturerAccess() 0x0057 ManufacturingStatus
19.2.38
ManufacturerAccess() 0x0058 AFE Register
19.2.39
ManufacturerAccess() 0x005C VCT Voltage
19.2.40
ManufacturerAccess() 0x005E ChargingStatusExt
19.2.41
ManufacturerAccess() 0x0060 Lifetime Data Block 1
19.2.42
ManufacturerAccess() 0x0061 Lifetime Data Block 2
19.2.43
ManufacturerAccess() 0x0062 Lifetime Data Block 3
19.2.44
ManufacturerAccess() 0x0063 Lifetime Data Block 4
19.2.45
ManufacturerAccess() 0x0064 Lifetime Data Block 5
19.2.46
ManufacturerAccess() 0x0065 Lifetime Data Block 6
19.2.47
ManufacturerAccess() 0x0066 Lifetime Data Block 7
19.2.48
ManufacturerAccess() 0x0067 Lifetime Data Block 8
19.2.49
ManufacturerAccess() 0x0068 Lifetime Data Block 9
19.2.50
ManufacturerAccess() 0x0069 Lifetime Data Block 10
19.2.51
ManufacturerAccess() 0x006A Lifetime Data Block 11
19.2.52
ManufacturerAccess() 0x006B Lifetime Data Block 12
19.2.53
ManufacturerAccess() 0x006C Lifetime Data Block 13
19.2.54
ManufacturerAccess() 0x006D Lifetime Data Block 14
19.2.55
ManufacturerAccess() 0x006E Lifetime Data Block 15
19.2.56
ManufacturerAccess() 0x006F Power Events
19.2.57
ManufacturerAccess() 0x0070 ManufacturerInfo
19.2.58
ManufacturerAccess() 0x0071 DAStatus1
19.2.59
ManufacturerAccess() 0x0072 DAStatus2
19.2.60
ManufacturerAccess() 0x0073 GaugeStatus1
19.2.61
ManufacturerAccess() 0x0074 GaugeStatus2
19.2.62
ManufacturerAccess() 0x0075 GaugeStatus3
19.2.63
ManufacturerAccess() 0x0076 CBStatus
19.2.64
ManufacturerAccess() 0x0077 StateofHealth
19.2.65
ManufacturerAccess() 0x0078 FilterCapacity
19.2.66
ManufacturerAccess() 0x0079 RSOCWrite
19.2.67
ManufacturerAccess() 0x007A ManufacturerInfoB
19.2.68
ManufacturerAccess() 0x007B ManufacturerInfoC
19.2.69
ManufacturerAccess() 0x007E Lifetime Data Block 16
19.2.70
ManufacturerAccess() 0x0098 AccumulationChargeEnable
19.2.71
ManufacturerAccess() 0x0099 AccumulationDischargeEnable
19.2.72
ManufacturerAccess() 0x009A AccumulationReset
19.2.73
ManufacturerAccess() 0x009B AccumulationStop
19.2.74
ManufacturerAccess() 0x009C AccumulationStart
19.2.75
ManufacturerAccess() 0x009D AccumulationChargeThreshold
19.2.76
ManufacturerAccess() 0x009E AccumulationDischargeThreshold
19.2.77
ManufacturerAccess() 0x009F AccumulatedChargeTime
19.2.78
ManufacturerAccess() 0x00B0 ChargingVoltageOverride
19.2.79
ManufacturerAccess() 0x00B2 ChargingCurrentOverride
19.2.80
ManufacturerAccess() 0x00B4 RTC Access
19.2.81
ManufacturerAccess() 0x00B5 ChargerStatus
19.2.82
ManufacturerAccess() 0x00D2 ISI Current State
19.2.83
ManufacturerAccess() 0x00F0 IATAShutdown
19.2.84
ManufacturerAccess() 0x00F1 IATARm
19.2.85
ManufacturerAccess() 0x00F2 IATAFcc
19.2.86
ManufacturerAccess() 0x0F00 ROM Mode
19.2.87
ManufacturerAccess() 0x3008 WriteTemp
19.2.88
ManufacturerAccess() 0x4000–0x5FFF DataFlashAccess
19.2.89
ManufacturerAccess() 0xF080 and 0xF081 Output CCADCCal Control
19.2.90
ManufacturerAccess() 0xF082 OutputShortedCCADCCal
20
Data Flash Values
20.1
Settings
20.1.1
Configuration
20.1.1.1
Charging Configuration
20.1.1.2
Charging Configuration Ext
20.1.1.3
FET Options
20.1.1.4
SBS Gauging Configuration
20.1.1.5
SBS Configuration
20.1.1.6
Auth Config
20.1.1.7
Power Config
20.1.1.8
IO Config
20.1.1.9
Temperature Enable
20.1.1.10
Temperature Mode
20.1.1.11
DA Configuration
20.1.1.12
SOC Flag Config A
20.1.1.13
SOC Flag Config B
20.1.1.14
IT Gauging Configuration
20.1.1.15
IT Gauging Ext
20.1.1.16
Elevated Degrade Configuration
20.1.1.17
DZT Gauging Configuration
20.1.2
Flag Map
20.1.2.1
Set Up 1 Configuration
20.1.2.2
Set Up 1 Pin Number
20.1.2.3
Set Up 2 Configuration
20.1.2.4
Set Up 2 Pin Number
20.1.2.5
Set Up 3 Configuration
20.1.2.6
Set Up 3 Pin Number
20.1.2.7
Set Up 4 Configuration
20.1.2.8
Set Up 4 Pin Number
20.1.3
GPIO
20.1.3.1
Pres Pin Number
20.1.3.2
Disconnect Pin Number
20.1.3.3
Emergency Shutdown Pin Number
20.1.3.4
IO Shutdown Pin Number
20.1.3.5
BTP Pin Number
20.1.3.6
BTP Pin Configuration
20.1.3.7
GPIO_PF Pin Number
20.1.3.8
GPIO_INT Enable
20.1.3.9
GPIO_INT Output Enable
20.1.3.10
GPIO_INT Default Out
20.1.3.11
Sealed Access Config
20.1.4
BTP
20.1.4.1
Init Discharge Set
20.1.4.2
Init Charge Set
20.1.4.3
Init Charge SOC Set
20.1.4.4
Init Discharge SOC Set
20.1.5
Sealed Access
20.1.5.1
DF Only Read Timeout
20.1.5.2
MfgInfoC Write Timeout
20.1.6
Lifetimes
20.1.6.1
Lifetimes Configuration
20.1.6.2
Time RSOC Thresholds
20.1.6.3
Temperature Hold-off Time
20.1.6.4
Time Temperature Limits
20.1.7
Protection
20.1.7.1
Protection Configuration
20.1.7.2
Enabled Protections A
20.1.7.3
Enabled Protections B
20.1.7.4
Enabled Protections C
20.1.7.5
Enabled Protections D
20.1.8
Permanent Failure
20.1.8.1
Enabled PF A
20.1.8.2
Enabled PF B
20.1.8.3
Enabled PF C
20.1.8.4
Enabled PF D
20.1.9
AFE
20.1.9.1
OCC
20.1.9.2
OCD
20.1.9.3
Short Circuit Discharge
20.1.9.4
Under Voltage
20.1.9.5
Over Voltage
20.1.9.6
Current Charge Wake
20.1.9.7
Current Discharge Wake
20.1.9.8
OCC Delay
20.1.9.9
OCD Delay
20.1.9.10
Short Circuit Discharge Delay
20.1.9.11
Under Voltage Delay
20.1.9.12
Over Voltage Delay
20.1.9.13
Over Voltage Delay Hi
20.1.9.14
CD Wake Delay
20.1.9.15
CC Wake Delay
20.1.9.16
ZVCHG Exit Threshold
20.1.10
Smart Temperature
20.1.10.1
Mid Point Temp
20.1.11
Manufacturing
20.1.11.1
Manufacturing Status Init
20.1.12
Accumulated Charge Measurement
20.1.12.1
Accum Discharge Threshold
20.1.12.2
Accum Charge Threshold
20.2
Advanced Charging Algorithm
20.2.1
Minimum System Voltage
20.2.2
CHGR_DET Off Voltage
20.2.3
CHGR_DET On Voltage
20.2.4
Temperature Ranges
20.2.4.1
T1 Temp
20.2.4.2
Hysteresis Temp T1
20.2.4.3
T2 Temp
20.2.4.4
Hysteresis Temp T2
20.2.4.5
T5 Temp
20.2.4.6
Hysteresis Temp T5
20.2.4.7
T6 Temp
20.2.4.8
Hysteresis Temp T6
20.2.4.9
T3 Temp
20.2.4.10
Hysteresis Temp T3
20.2.4.11
T4 Temp
20.2.4.12
Hysteresis Temp T4
20.2.5
PreCharging
20.2.6
Maintenance Charging
20.2.7
Voltage Range
20.2.7.1
Precharge Start Voltage
20.2.7.2
Charging Voltage Low
20.2.7.3
Charging Voltage Med
20.2.7.4
Charging Voltage High
20.2.7.5
Charging Voltage Hysteresis
20.2.8
Degrade Mode 1
20.2.8.1
Cycle Threshold
20.2.8.2
SOH Threshold
20.2.8.3
Runtime Threshold
20.2.8.4
Voltage Degradation
20.2.8.5
Current Degradation
20.2.9
Degrade Mode 2
20.2.9.1
Cycle Threshold
20.2.9.2
SOH Threshold
20.2.9.3
Runtime Threshold
20.2.9.4
Voltage Degradation
20.2.9.5
Current Degradation
20.2.10
Degrade Mode 3
20.2.10.1
Cycle Threshold
20.2.10.2
SOH Threshold
20.2.10.3
Runtime Threshold
20.2.10.4
Voltage Degradation
20.2.10.5
Current Degradation
20.2.11
Degrade Mode
20.2.11.1
Runtime Degrade
20.2.11.2
Runtime Update Interval
20.2.11.3
Cycle Count Start Runtime
20.2.12
CS Degrade
20.2.12.1
Temperature Threshold
20.2.12.2
Voltage Threshold
20.2.12.3
Time Interval
20.2.12.4
Delta Voltage
20.2.12.5
Min CV
20.2.13
Charge Voltage Override
20.2.13.1
CHGV Override Max
20.2.13.2
CHGV Override Min
20.2.14
Charge Current Override
20.2.14.1
CHGI Override Max
20.2.14.2
CHGI Override Min
20.2.15
Termination Config
20.2.15.1
Minimum Taper Charge
20.2.15.2
Charge Term Taper Current
20.2.15.3
Charge Term Voltage Offset
20.2.15.4
Charge Term Charging Voltage
20.2.16
Charging Rate of Change
20.2.16.1
Current Rate
20.2.16.2
Voltage Rate
20.2.17
Charge Loss Compensation
20.2.17.1
CCC Current Threshold
20.2.17.2
CCC Voltage Threshold
20.2.18
IR Correction
20.2.18.1
Averaging Interval
20.2.19
Sealed Write
20.2.19.1
Hold Off
20.2.19.2
Lockout
20.2.20
Low Temp Charging
20.2.20.1
Voltage
20.2.20.2
Current Low
20.2.20.3
Current Med
20.2.20.4
Current High
20.2.21
Standard Temp Low Charging
20.2.21.1
Voltage
20.2.21.2
Current Low
20.2.21.3
Current Med
20.2.21.4
Current High
20.2.22
Standard Temp High Charging
20.2.22.1
Voltage
20.2.22.2
Current Low
20.2.22.3
Current Med
20.2.22.4
Current High
20.2.23
High Temp Charging
20.2.23.1
Voltage
20.2.23.2
Current Low
20.2.23.3
Current Med
20.2.23.4
Current High
20.2.24
Rec Temp Charging
20.2.24.1
Voltage
20.2.24.2
Current Low
20.2.24.3
Current Med
20.2.24.4
Current High
20.2.25
Elevated Degrade
20.2.25.1
Accumulated ERM Time
20.2.25.2
Accumulated ERETM Time
20.2.25.3
Accumulated EVLTM Time
20.2.25.4
Accumulated EVMTM Time
20.2.25.5
Accumulated EVHTM Time
20.2.25.6
ERETM Status
20.2.25.7
EVTM Degrade
20.2.25.8
EVTM Active
20.2.25.9
ERM Reset RSoC Threshold
20.2.25.10
ERM Reset Voltage Threshold
20.2.25.11
ERM RSoC Threshold
20.2.25.12
ERM Voltage Threshold
20.2.25.13
ERM Time Threshold
20.2.25.14
ERETM RSoC Threshold
20.2.25.15
ERETM Voltage Threshold
20.2.25.16
ERETM Temperature Threshold
20.2.25.17
ERETM Time Threshold
20.2.25.18
ERETM Charging Voltage
20.2.25.19
EVTM Voltage Thresholds
20.2.25.20
EVTM Temperature Thresholds
20.2.25.21
EVLTM Time Thresholds
20.2.25.22
EVLTM Delta Charging Voltages
20.2.25.23
EVMTM Time Thresholds
20.2.25.24
EVMTM Delta Charging Voltages
20.2.25.25
EVHTM Time Thresholds
20.2.25.26
EVHTM Delta Charging Voltages
20.3
Power
20.3.1
Power
20.3.2
Shutdown
20.3.2.1
Shutdown Voltage
20.3.2.2
Shutdown Time
20.3.2.3
IO Shutdown Delay
20.3.2.4
IO Shutdown Timeout
20.3.2.5
Low RSoC Shutdown Threshold
20.3.2.6
Low RSoC Shutdown Time
20.3.2.7
Charger Present Threshold
20.3.3
Sleep
20.3.3.1
Sleep Current
20.3.3.2
Low Current
20.3.3.3
Low Current Period
20.3.3.4
Measure Time
20.3.3.5
Bus Timeout
20.3.3.6
Current Time
20.3.4
Ship
20.3.4.1
FET Off Time
20.3.4.2
Delay
20.3.4.3
Auto Ship Time
20.3.5
Power Off
20.3.6
Manual FET Control
20.3.7
System Present
20.3.7.1
SysPres Delay
20.3.8
Storage
20.3.8.1
Storage Delay
20.3.8.2
Storage Ignore SMB Delay
20.3.9
Power Events
20.3.9.1
Power Events
20.3.10
IATA
20.3.10.1
IATA Config
20.3.10.2
IATA Delay Time
20.3.10.3
IATA RSOC Threshold
20.3.10.4
IATA Wake AbsRSOC
20.3.10.5
IATA MIN Temperature
20.3.10.6
IATA MAX Temperature
20.3.10.7
IATA MIN Voltage
20.3.10.8
IATA MAX Voltage
20.3.11
IATA STORE
20.3.11.1
IATA RM mAH
20.3.11.2
IATA RM cWH
20.3.11.3
IATA FCC mAH
20.3.11.4
IATA FCC cWH
20.3.11.5
IATA Flag
20.3.12
Unintended Wakeup
20.3.12.1
Delay
20.3.12.2
Count
20.4
System Data
20.4.1
Manufacturer Info
20.4.2
Manufacturer Info B
20.4.3
Manufacturer Info C
20.4.4
Integrity
20.4.4.1
Static DF Signature
20.4.4.2
Static Chem DF
20.4.4.3
All DF Signature
20.5
SBS Configuration
20.5.1
Data
20.5.1.1
Manufacturer Date
20.5.1.2
Serial Number
20.5.1.3
Manufacturer Name
20.5.1.4
Device Name
20.5.1.5
Device Chemistry
20.5.1.6
Remaining Capacity Alarm
20.5.1.6.1
Remaining Ah Capacity Alarm
20.5.1.6.2
Remaining Wh Capacity Alarm
20.5.1.7
RemainingTimeAlarm
20.5.1.8
Initial Battery Mode
20.5.1.9
Specification Information
20.5.1.10
VLB Remaining Capacity
20.5.1.10.1
VLB Remaining Cap mAh
20.5.1.10.2
VLB Remaining Cap in cWh
20.5.1.11
VLB Voltage
20.5.1.12
VLB Hold Time
20.5.1.13
VLB Timeout
20.6
Lifetimes
20.6.1
Cell 1 Max Voltage
20.6.2
Cell 1 Min Voltage
20.6.3
Current
20.6.3.1
Max Charge Current
20.6.3.2
Max Discharge Current
20.6.3.3
Max Avg Dsg Current
20.6.3.4
Max Avg Dsg Power
20.6.4
Temperature-Relax
20.6.4.1
Max Temp Cell
20.6.4.2
Min Temp Cell
20.6.4.3
Min Temp Int Sensor
20.6.4.4
Max Temp Int Sensor
20.6.4.5
Max Temp Fet
20.6.4.6
Max Temp TS1
20.6.4.7
Min Temp TS1
20.6.5
Max Temp Cell
20.6.6
Min Temp Cell
20.6.7
Max Temp Int Sensor
20.6.8
Min Temp Int Sensor
20.6.9
Max Temp Fet
20.6.10
Max Temp TS1
20.6.11
Min Temp TS1
20.6.12
Max Temp Cell
20.6.13
Min Temp Cell
20.6.14
Max Temp Int Sensor
20.6.15
Min Temp Int Sensor
20.6.16
Max Temp Fet
20.6.17
Max Temp TS1
20.6.18
Min Temp TS1
20.6.19
Safety Events
20.6.19.1
No Of COV Events
20.6.19.2
Last COV Event
20.6.19.3
No Of CUV Events
20.6.19.4
Last CUV Event
20.6.19.5
No Of OCD1 Events
20.6.19.6
Last OCD1 Event
20.6.19.7
No Of OCD2 Events
20.6.19.8
Last OCD2 Event
20.6.19.9
No Of OCC1 Events
20.6.19.10
Last OCC1 Event
20.6.19.11
No Of OCC2 Events
20.6.19.12
Last OCC2 Event
20.6.19.13
No Of AOCD Events
20.6.19.14
Last AOCD Event
20.6.19.15
No Of ASCD Events
20.6.19.16
Last ASCD Event
20.6.19.17
No Of AOCC Events
20.6.19.18
Last AOCC Event
20.6.19.19
No Of OTC Events
20.6.19.20
Last OTC Event
20.6.19.21
No Of OTD Events
20.6.19.22
Last OTD Event
20.6.19.23
No Of OTF Events
20.6.19.24
Last OTF Event
20.6.20
Charging Events
20.6.20.1
No Valid Charge Term
20.6.20.2
Last Valid Charge Term
20.6.21
Gauging Events
20.6.21.1
No Of Qmax Updates
20.6.21.2
Last Qmax Update
20.6.21.3
No Of Ra Updates
20.6.21.4
Last Ra Update
20.6.21.5
No Of Ra Disable
20.6.21.6
Last Ra Disable
20.6.22
Time
20.6.22.1
Total Firmware Runtime
20.6.22.2
Time Spent in LFT_UUT
20.6.22.3
Time Spent in LFT_UT
20.6.22.4
Time Spent in LFT_LT
20.6.22.5
Time Spent in LFT_STL
20.6.22.6
Time Spent in LFT_RT
20.6.22.7
Time Spent in LFT_STH
20.6.22.8
Time Spent in LFT_HT
20.6.22.9
Time Spent in LFT_OT
20.7
Protections
20.7.1
CUV—Cell Undervoltage
20.7.1.1
Threshold
20.7.1.2
Delay
20.7.1.3
Recovery
20.7.1.4
Recovery Charger Present Time
20.7.2
CUVC—Cell Undervoltage
20.7.2.1
Threshold
20.7.2.2
Delay
20.7.2.3
Recovery
20.7.3
ACUV—Cell Under Voltage hardware based
20.7.3.1
Recovery (ACUV)
20.7.4
ACOV—Cell Over Voltage hardware based
20.7.4.1
Recovery (ACOV)
20.7.5
COV—Cell Overvoltage
20.7.5.1
Threshold Low Temp
20.7.5.2
Threshold Standard Temp Low
20.7.5.3
Threshold Standard Temp High
20.7.5.4
Threshold High Temp
20.7.5.5
Threshold Rec Temp
20.7.5.6
Delay
20.7.5.7
Recovery Low Temp
20.7.5.8
Recovery Standard Temp Low
20.7.5.9
Recovery Standard Temp High
20.7.5.10
Recovery High Temp
20.7.5.11
Recovery Rec Temp
20.7.5.12
Cell Overvoltage Latch Limit
20.7.5.13
Cell Overvoltage Counter Decrement Delay
20.7.5.14
Reset
20.7.6
OCC1—Overcurrent In Charge 1
20.7.6.1
Threshold
20.7.6.2
Delay
20.7.7
OCC2—Overcurrent In Charge 2
20.7.7.1
Threshold
20.7.7.2
Delay
20.7.8
OCC—Overcurrent In Charge Recovery
20.7.8.1
Recovery Threshold
20.7.8.2
Recovery Delay
20.7.9
OCD1—Overcurrent In Discharge 1
20.7.9.1
Threshold
20.7.9.2
Delay
20.7.10
OCD2—Overcurrent In Discharge 2
20.7.10.1
Threshold
20.7.10.2
Delay
20.7.11
OCD—Overcurrent In Discharge Recovery
20.7.11.1
Recovery Threshold
20.7.11.2
Recovery Delay
20.7.11.3
Latch Limit
20.7.11.4
Counter Dec Delay
20.7.11.5
Reset
20.7.12
AOCD—Overload in Discharge
20.7.12.1
Latch Limit
20.7.12.2
Counter Dec Delay
20.7.12.3
Recovery
20.7.12.4
Reset
20.7.13
AOCC—Overcurrent In Charge
20.7.13.1
Latch Limit
20.7.13.2
Counter Dec Delay
20.7.13.3
Recovery
20.7.13.4
Reset
20.7.14
ASCD—Short Circuit in Discharge
20.7.14.1
Latch Limit
20.7.14.2
Counter Dec Delay
20.7.14.3
Recovery
20.7.14.4
Reset
20.7.15
OTC—Overtemperature in Charge
20.7.15.1
Threshold
20.7.15.2
Delay
20.7.15.3
Recovery
20.7.16
OTD—Overtemperature in Discharge
20.7.16.1
Threshold
20.7.16.2
Delay
20.7.16.3
Recovery
20.7.17
OTF—Overtemperature FET
20.7.17.1
Threshold
20.7.17.2
Delay
20.7.17.3
Recovery
20.7.18
UTC—Undertemperature in Charge
20.7.18.1
Threshold
20.7.18.2
Delay
20.7.18.3
Recovery
20.7.19
UTD—Undertemperature in Discharge
20.7.19.1
Threshold
20.7.19.2
Delay
20.7.19.3
Recovery
20.7.20
HWD—Host Watchdog
20.7.21
PTO—PRECHARGE Mode Time Out
20.7.21.1
Charge Threshold
20.7.21.2
Suspend Threshold
20.7.21.3
Delay
20.7.21.4
Reset
20.7.22
CTO—Fast Charge Mode Time Out
20.7.22.1
Charge Threshold
20.7.22.2
Suspend Threshold
20.7.22.3
Delay
20.7.22.4
Reset
20.7.23
OC—Overcharge
20.7.23.1
Threshold
20.7.23.2
Recovery
20.7.23.3
RSOC Recovery
20.7.24
CHGV—ChargingVoltage
20.7.24.1
Threshold
20.7.24.2
Delay
20.7.24.3
Recovery
20.7.25
CHGC—ChargingCurrent
20.7.25.1
Threshold
20.7.25.2
Delay
20.7.25.3
Recovery Threshold
20.7.25.4
Recovery Delay
20.7.26
PCHGC—Pre-ChargingCurrent
20.7.26.1
Threshold
20.7.26.2
Delay
20.7.26.3
Recovery Threshold
20.7.26.4
Recovery Delay
20.8
Permanent Fail
20.8.1
SUV—Safety Cell Undervoltage
20.8.1.1
Threshold
20.8.1.2
Delay
20.8.2
SOV—Safety Cell Overvoltage
20.8.2.1
Threshold
20.8.2.2
Delay
20.8.3
SOCC—Safety Overcurrent in Charge
20.8.3.1
Threshold
20.8.3.2
Delay
20.8.4
SOCD—Safety Overcurrent in Discharge
20.8.4.1
Threshold
20.8.4.2
Delay
20.8.5
SOT—Overtemperature Cell
20.8.5.1
SOTC Threshold
20.8.5.2
SOTC Delay
20.8.5.3
SOTD Threshold
20.8.5.4
SOTD Delay
20.8.6
SOTF—Overtemperature FET
20.8.6.1
Threshold
20.8.6.2
Delay
20.8.7
CD—Capacity Degradation
20.8.7.1
Threshold
20.8.7.2
Delay
20.8.8
CFET—CHG FET Failure
20.8.8.1
OFF Threshold
20.8.8.2
OFF Delay
20.8.9
DFET—DFET Failure
20.8.9.1
OFF Threshold
20.8.9.2
OFF Delay
20.8.10
AFER—AFE Register
20.8.10.1
Threshold
20.8.10.2
Delay Period
20.8.10.3
Compare Period
20.8.11
AFEC—AFE Communication
20.8.11.1
Threshold
20.8.11.2
Delay Period
20.9
PF Status
20.9.1
Device Status Data
20.9.1.1
Safety Alert A
20.9.1.2
Safety Status A
20.9.1.3
Safety Alert B
20.9.1.4
Safety Status B
20.9.1.5
Safety Alert C
20.9.1.6
Safety Status C
20.9.1.7
Safety Alert D
20.9.1.8
Safety Status D
20.9.1.9
PF Alert A
20.9.1.10
PF Status A
20.9.1.11
PF Alert B
20.9.1.12
PF Status B
20.9.1.13
PF Alert C
20.9.1.14
PF Status C
20.9.1.15
PF Alert D
20.9.1.16
PF Status D
20.9.1.17
Fuse Flag
20.9.1.18
Operation Status A
20.9.1.19
Operation Status B
20.9.1.20
Temp Range
20.9.1.21
Charging Status A
20.9.1.22
Charging Status B
20.9.1.23
Gauging Status
20.9.1.24
IT Status
20.9.2
Device Voltage Data (at the Time of PF Event)
20.9.2.1
Cell 1 Voltage
20.9.2.2
Battery Direct Voltage
20.9.2.3
Pack Voltage
20.9.3
Device Current Data
20.9.4
Device Gauging Data (at the Time of PF Event)
20.9.4.1
Cell 1DOD0
20.9.4.2
Passed Charge
20.9.5
AFE Regs
20.9.5.1
OCC
20.9.5.2
OCD1
20.9.5.3
OCD2
20.9.5.4
Short Circuit Discharge
20.9.5.5
Current Discharge Wake
20.9.5.6
Current Charge Wake
20.9.5.7
OCC 1 Delay 2
20.9.5.8
OCC 1 Delay 1
20.9.5.9
OCD 1 Delay 2
20.9.5.10
OCD 1 Delay 1
20.9.5.11
OCD 2 Delay 2
20.9.5.12
OCD 2 Delay 1
20.9.5.13
Short Circuit Discharge Delay
20.9.5.14
Over Temperature Delay
20.9.5.15
OCD Wake Delay 2
20.9.5.16
OCD Wake Delay 1
20.9.5.17
OCC Wake Delay 2
20.9.5.18
OCC Wake Delay 1
20.10
Black Box
20.10.1
Safety Status
20.10.2
PF Status
20.11
Gas Gauging
20.11.1
Current Thresholds
20.11.1.1
Dsg Current Threshold
20.11.1.2
Chg Current Threshold
20.11.1.3
Quit Current
20.11.1.4
Dsg Relax Time
20.11.1.5
Chg Relax Time
20.11.2
Design
20.11.2.1
Design Capacity mAh
20.11.2.2
Design Capacity cWh
20.11.2.3
Design Voltage
20.11.3
Cycle
20.11.4
FD
20.11.4.1
Set Voltage Threshold
20.11.4.2
Clear Voltage Threshold
20.11.4.3
Set % RSOC Threshold
20.11.4.4
Clear % RSOC Threshold
20.11.5
FC
20.11.5.1
Set Voltage Threshold
20.11.5.2
Clear Voltage Threshold
20.11.5.3
Set % RSOC Threshold
20.11.5.4
Clear % RSOC Threshold
20.11.6
TD
20.11.6.1
Set Voltage Threshold
20.11.6.2
Clear Voltage Threshold
20.11.6.3
Set % RSOC Threshold
20.11.6.4
Clear % RSOC Threshold
20.11.7
TC
20.11.7.1
Set Voltage Threshold
20.11.7.2
Clear Voltage Threshold
20.11.7.3
Set % RSOC Threshold
20.11.7.4
Clear % RSOC Threshold
20.11.8
State
20.11.8.1
QMax
20.11.8.2
Update Status
20.11.8.3
Cell 1 Chg Voltage at EoC
20.11.8.4
Current at EoC
20.11.8.5
Average Last Run
20.11.8.5.1
Avg I Last Run
20.11.8.5.2
Avg P Last Run
20.11.8.6
Delta Voltage
20.11.8.7
Temp
20.11.8.7.1
Temp k
20.11.8.7.2
Temp a
20.11.8.8
Max Avg Last Run
20.11.8.8.1
Max Avg I Last Run
20.11.8.8.2
Max Avg P Last Run
20.11.8.9
SOH FCC Max
20.11.8.9.1
SOH FCC Max mAh
20.11.8.9.2
SOH FCC Max cWh
20.11.8.10
SOH Temp
20.11.8.10.1
SOH Temp k
20.11.8.10.2
SOH Temp a
20.11.8.11
Cycle Count
20.11.9
Turbo Cfg
20.11.9.1
Min System Voltage
20.11.9.2
Ten Second Max C-Rate
20.11.9.3
Ten Millisecond Max C-Rate
20.11.9.4
High Frequency Resistance
20.11.9.5
Reserve Energy %
20.11.9.6
Turbo Adjustment Factor
20.11.10
IT-DZT Config
20.11.10.1
Design Resistance
20.11.10.2
Pack Resistance
20.11.10.3
System Resistance
20.11.10.4
Predict Ambient Time
20.11.10.5
Ra Filter
20.11.10.6
Ra Max Delta
20.11.10.7
Reference Grid
20.11.10.8
Resistance Parameter Filter
20.11.10.9
Near EDV Ra Param Filter
20.11.10.10
Max Current Change %
20.11.10.11
Resistance Update Voltage
20.11.10.12
Qmax Delta
20.11.10.13
Qmax Upper Bound
20.11.10.14
Term Voltage
20.11.10.15
Res Relax Time
20.11.10.16
Term Voltage Delta
20.11.10.17
Max Simulation Iterations
20.11.10.18
Simulation Near Term Delta
20.11.10.19
Fast Scale Start SOC
20.11.10.20
DeltaV Max Voltage Delta
20.11.10.21
Load Select
20.11.10.22
Fast Scale Load Select
20.11.10.23
Load Mode
20.11.10.24
User Rate-mA
20.11.10.25
User Rate-cW
20.11.10.26
Reserve Cap-mAh
20.11.10.27
Reserve Cap-cWh
20.11.11
Smoothing
20.11.11.1
Smooth Relax Time
20.11.11.2
Term Smooth Start Cell V Delta
20.11.11.3
Term Smooth Final Cell V Delta
20.11.11.4
Term Smooth Time
20.11.12
Condition Flag
20.11.13
Max Error
20.11.13.1
Time Cycle Equivalent
20.11.13.2
Cycle Delta
20.11.14
SOH
20.12
RA Table
20.12.1
R_a0
20.12.2
R_a0x
21
Data Flash Access and Format
21.1
Data Flash Access
21.1.1
Minimum Voltage
21.2
Data Formats
21.2.1
Unsigned Integer
21.2.2
Integer
21.2.3
Floating Point
21.2.4
Hex
21.2.5
String
22
Data Flash Summary
22.1
Data Flash Summary - Subject to Change upon FW build details
23
Revision History
20.11.2
Design