SLUUCW8 October   2023 BQ27Z746

1.   1
2.   Read This First
   1.     About This Manual
   2.     Notational Conventions
   3.     Battery Notational Conventions
   4.     Trademarks
   5.     Glossary
3. 1 Introduction
4. 2 IO Options
   1. 2.1 Configuration of the GPO Pin
5. 3 Basic Measurement System
   1. 3.1 Introduction
   2. 3.2 Current and Coulomb Counting
   3. 3.3 Voltage
      1. 3.3.1 Cell Voltage
      2. 3.3.2 Pack Voltage
   4. 3.4 Temperature
      1. 3.4.1 Internal Temperature
      2. 3.4.2 Cell Temperature
      3. 3.4.3 Optional Second Temperature Sensor
      4. 3.4.4 Temperature Configuration
6. 4 Protections
   1. 4.1 Introduction
   2. 4.2 Hardware-Based Protection
      1. 4.2.1 Cell Undervoltage Protection
      2. 4.2.2 Cell Overvoltage Protection
      3. 4.2.3 Overcurrent in Discharge Protection
      4. 4.2.4 Overcurrent in Charge Protection
      5. 4.2.5 Short Circuit in Discharge Protection
      6. 4.2.6 Threshold Targets
   3. 4.3 Firmware Based Protections
      1. 4.3.1  Cell Undervoltage Protection
      2. 4.3.2  Cell Overvoltage Protection
      3. 4.3.3  Overcurrent in Charge Protection
      4. 4.3.4  Overcurrent in Discharge Protection
      5. 4.3.5  Temperature Protections
      6. 4.3.6  Overtemperature in Charge Protection
      7. 4.3.7  Overtemperature in Discharge Protection
      8. 4.3.8  Undertemperature in Charge Protection
      9. 4.3.9  Undertemperature in Discharge Protection
      10. 4.3.10 Precharge Timeout Protection
      11. 4.3.11 Fast Charge Timeout Protection
      12. 4.3.12 Protections Configuration
      13. 4.3.13 FET Options
      14. 4.3.14 Protections Data Flash Values
          1. 4.3.14.1  CUV—Cell Undervoltage
          2. 4.3.14.2  HCUV—Hardware Cell Undervoltage
          3. 4.3.14.3  COV—Cell Overvoltage
          4. 4.3.14.4  HCOV—Hardware Cell Overvoltage
          5. 4.3.14.5  OCC—Overcurrent In Charge
          6. 4.3.14.6  HOCC—Hardware Overcurrent in Charge
          7. 4.3.14.7  OCD—Overcurrent in Discharge
          8. 4.3.14.8  HOCD—Hardware Overcurrent in Discharge
          9. 4.3.14.9  HSCD—Hardware Short Circuit in Discharge
          10. 4.3.14.10 OTC—Overtemperature in Charge
          11. 4.3.14.11 OTD—Overtemperature in Discharge
          12. 4.3.14.12 UTC—Undertemperature in Charge
          13. 4.3.14.13 UTD—Undertemperature in Discharge
7. 5 Permanent Fail
   1. 5.1 Introduction
   2. 5.2 Safety Cell Undervoltage Permanent Fail
   3. 5.3 Safety Cell Overvoltage Permanent Fail
   4. 5.4 Charge FET Permanent Fail
   5. 5.5 Discharge FET Permanent Fail
   6. 5.6 Permanent Fail Configuration
   7. 5.7 Permanent Fail Data Flash Values
      1. 5.7.1 SUV - Safety Undervoltage
      2. 5.7.2 SOV - Safety Overvoltage
      3. 5.7.3 CFETF - Charge FET Failure
      4. 5.7.4 DFETF - Discharge FET Failure
8. 6 Battery Sensing Output
   1. 6.1 Introduction
   2. 6.2 Automatic Mode
      1. 6.2.1 RLO Mode
      2. 6.2.2 RLO Charge Mode
      3. 6.2.3 BUFFER Mode
   3. 6.3 Hardware-Based Protections
9. 7 Power Modes
   1. 7.1 Introduction
   2. 7.2 NORMAL Mode
   3. 7.3 SLEEP Mode
      1. 7.3.1 Device Sleep
   4. 7.4 SHIP Mode
   5. 7.5 SHELF Mode
   6. 7.6 SHUTDOWN Mode
      1. 7.6.1 Voltage-Based Shutdown
      2. 7.6.2 AltManufacturerAccess() MAC Shutdown
      3. 7.6.3 Time-Based Shutdown
   7. 7.7 Power Modes Configuration
10. 8 Gauging
    1. 8.1  Impedance Track (IT) Model
    2. 8.2  Thermal Model
    3. 8.3  Gauging Capacities
    4. 8.4  Learning Cycles
    5. 8.5  Impedance Track Configuration
    6. 8.6  Gas Gauge Modes
    7. 8.7  QMax and Ra
       1. 8.7.1 QMax Initial Values
       2. 8.7.2 QMax Update Conditions
          1. 8.7.2.1 Base Required Conditions
          2. 8.7.2.2 Tracking QMax Updates
          3. 8.7.2.3 Relaxed Cell OCV
          4. 8.7.2.4 OCV Prediction
          5. 8.7.2.5 Cycle Count Based QMax Degradation
          6. 8.7.2.6 105
          7. 8.7.2.7 Fast QMax Update Conditions
          8. 8.7.2.8 QMax and Fast QMax Update Boundary Check
       3. 8.7.3 Ra Table Initial Values
          1. 8.7.3.1 R_a0 Table
          2. 8.7.3.2 R_a0x Table
       4. 8.7.4 Ra Table Update Conditions
       5. 8.7.5 Fast Resistance Scaling
          1. 8.7.5.1 Calculation of Resistance Scale
          2. 8.7.5.2 Negative Resistance Scale
          3. 8.7.5.3 Reset of Resistance Scale
          4. 8.7.5.4 Application of Resistance Scale
          5. 8.7.5.5 Fast Resistance Scaling Configuration
    8. 8.8  FullChargeCapacity (FCC), RemainingCapacity (RemCap), and RelativeStateOfCharge (RSOC)
       1. 8.8.1 Smoothing Engine
          1. 8.8.1.1 Smoothing to 0% in DISCHARGE Mode
          2. 8.8.1.2 Smoothing to 100% in CHARGE Mode
          3. 8.8.1.3 Smoothing in RELAX Mode
    9. 8.9  Impedance Track (IT) Configuration Options
    10. 8.10 State-Of-Health (SOH)
    11. 8.11 Battery Trip Point (BTP)
11. 9 Lifetime Data Collection
    1. 9.1 Description
    2. 9.2 Reset
12. 10Host Interrupts
    1. 10.1 Description
    2. 10.2 Voltage and Temperature Interrupts
    3. 10.3 RSOC Interrupts
    4. 10.4 Host Interrupts Configuration
13. 11Device Security
    1. 11.1 Description
    2. 11.2 SHA-256 Authentication
       1. 11.2.1 Secure Key
       2. 11.2.2 Authentication Flow
    3. 11.3 Security Modes
       1. 11.3.1 SEALING and UNSEALING Data Flash
       2. 11.3.2 SEALED to UNSEALED
       3. 11.3.3 UNSEALED to FULL ACCESS
14. 12Advanced Charge Algorithm
    1. 12.1  Introduction
    2. 12.2  Charge Temperature Ranges
    3. 12.3  Voltage Range
       1. 12.3.1 RelativeStateofCharge() Range
    4. 12.4  Charging Current
    5. 12.5  Charging Voltage
       1. 12.5.1 Charge Voltage Compensation for System Impedance
    6. 12.6  Charging Degradation Modes
    7. 12.7  Cell Swelling Control (via Charging Voltage Degradation)
    8. 12.8  Valid Charge Termination
    9. 12.9  Charge and Discharge Alarms
    10. 12.10 Terminate Charge and Discharge Alarms
    11. 12.11 Precharge
    12. 12.12 Charge Disable and Discharge Disable
    13. 12.13 Charge Inhibit
    14. 12.14 Charge Suspend
    15. 12.15 Zero Volt Charging (ZVCHG)
15. 13Communications
    1. 13.1 HDQ Single-Pin Serial Interface
    2. 13.2 I2C Interface
       1. 13.2.1 I2C Clock Frequency
       2. 13.2.2 I2C Time Out
       3. 13.2.3 I2C Command Waiting Time
       4. 13.2.4 I2C Clock Stretching
16. 14Manufacture Production
    1. 14.1 Manufacture Testing
       1. 14.1.1 Manufacturing Status Configuration
    2. 14.2 I2C Configuration
    3. 14.3 Manufacturer Information Blocks
    4. 14.4 Verification of Data Flash
    5. 14.5 Calibration
17. 15Calibration
    1. 15.1 Voltage Calibration
       1. 15.1.1 Cell (BAT) Voltage Calibration
       2. 15.1.2 Pack (PACK) Voltage Calibration
       3. 15.1.3 Voltage Calibration Data Flash
    2. 15.2 Current Calibration
       1. 15.2.1 CC Gain/Capacity Gain Calibration
       2. 15.2.2 Deadbands
          1. 15.2.2.1 Current Deadband
          2. 15.2.2.2 Coulomb Counter Deadband
       3. 15.2.3 Current Calibration Data Flash
    3. 15.3 Temperature Calibration
       1. 15.3.1 Internal Temperature Sensor Calibration
       2. 15.3.2 TS Calibration
       3. 15.3.3 Temperature Calibration Data Flash
       4. 15.3.4 Cell Temp Model
       5. 15.3.5 Internal Temp Model
       6. 15.3.6 2nd Temperature Model
18. 16Data Commands
    1. 16.1 Standard Data Commands
       1. 16.1.1  0x00/01 ManufacturerAccess()/ControlStatus()
       2. 16.1.2  0x02/03 AtRate()
       3. 16.1.3  0x04/05 AtRateTimeToEmpty()
       4. 16.1.4  0x06/07 Temperature()
       5. 16.1.5  0x08/09 Voltage()
       6. 16.1.6  0x0A/0B BatteryStatus()
       7. 16.1.7  0x0C/0D Current()
       8. 16.1.8  0x10/11 RemainingCapacity()
       9. 16.1.9  0x12/13 FullChargeCapacity()
       10. 16.1.10 0x14/15 AverageCurrent()
       11. 16.1.11 0x16/17 AverageTimeToEmpty()
       12. 16.1.12 0x18/19 AverageTimeToFull()
       13. 16.1.13 0x1E/1F MaxLoadCurrent()
       14. 16.1.14 0x20/21 MaxLoadTimeToEmpty()
       15. 16.1.15 0x22/23 AveragePower()
       16. 16.1.16 0x28/29 InternalTemperature()
       17. 16.1.17 0x2A/2B CycleCount()
       18. 16.1.18 0x2C/2D RelativeStateOfCharge()—RSOC
       19. 16.1.19 0x2E/2F StateOfHealth()
       20. 16.1.20 0x30/31 ChargingVoltage()
       21. 16.1.21 0x32/33 ChargingCurrent()
       22. 16.1.22 0x34/35 TerminateVoltage()
       23. 16.1.23 0x36/0x37/0x38/0x39 Timestamp()
       24. 16.1.24 QMax Cycles() 0x3A/3B
       25. 16.1.25 0x3C/3D DesignCapacity()
       26. 16.1.26 0x3E/3F AltManufacturerAccess()
       27. 16.1.27 0x40/0x5F MACData()
       28. 16.1.28 0x60 MACDataChecksum()
       29. 16.1.29 0x61 MACDataLength()
       30. 16.1.30 0x62/63 VoltHiSetThreshold
       31. 16.1.31 0x64/65 VoltHiClearThreshold
       32. 16.1.32 0x66/67 VoltLoSetThreshold
       33. 16.1.33 0x68/69 VoltLoClearThreshold
       34. 16.1.34 0x6A TempHiSetThreshold
       35. 16.1.35 0x6B TempHiClearThreshold
       36. 16.1.36 0X6C TempLoSetThreshold
       37. 16.1.37 0x6D TempLoClearThreshold
       38. 16.1.38 0x6E InterruptStatus()
       39. 16.1.39 0x6F SOCSetDeltaThreshold
    2. 16.2 0x00, 0x01 ManufacturerAccess() and 0x3E, 0x3F AltManufacturerAccess()
       1. 16.2.1  AltManufacturerAccess() 0x0001 Device Type
       2. 16.2.2  AltManufacturerAccess() 0x0002 Firmware Version
       3. 16.2.3  AltManufacturerAccess() 0x0003 Hardware Version
       4. 16.2.4  AltManufacturerAccess() 0x0004 Instruction Flash Signature
       5. 16.2.5  AltManufacturerAccess() 0x0005 Static DF Signature
       6. 16.2.6  AltManufacturerAccess() 0x0006 Chemical ID
       7. 16.2.7  AltManufacturerAccess() 0x0007 Pre_MACWrite
       8. 16.2.8  AltManufacturerAccess() 0x0008 Static Chem DF Signature
       9. 16.2.9  AltManufacturerAccess() 0x0009 All DF Signature
       10. 16.2.10 AltManufacturerAccess() 0x000B SHELF Enable
       11. 16.2.11 AltManufacturerAccess() 0x000C SHELF Disable
       12. 16.2.12 AltManufacturerAccess() 0x0010 SHUTDOWN Mode
       13. 16.2.13 AltManufacturerAccess() 0x0012 Device Reset
       14. 16.2.14 AltManufacturerAccess() 0x0015 SHIP Mode Enable
       15. 16.2.15 AltManufacturerAccess() 0x0016 SHIP Mode Disable
       16. 16.2.16 AltManufacturerAccess() 0x0017 QMax Day
       17. 16.2.17 AltManufacturerAccess() 0x001F CHG FET Toggle
       18. 16.2.18 AltManufacturerAccess() 0x0020 DSG FET Toggle
       19. 16.2.19 AltManufacturerAccess() 0x0021 Gauging
       20. 16.2.20 AltManufacturerAccess() 0x0022 FET Control
       21. 16.2.21 AltManufacturerAccess() 0x0023 Lifetime Data Collection
       22. 16.2.22 AltManufacturerAccess() 0x0024 Permanent Failure
       23. 16.2.23 AltManufacturerAccess() 0x0028 Lifetime Data Reset
       24. 16.2.24 AltManufacturerAccess() 0x0029 Permanent Fail Data Reset
       25. 16.2.25 AltManufacturerAccess() 0x002D CALIBRATION Mode
       26. 16.2.26 AltManufacturerAccess() 0x002E Lifetime Data Flush
       27. 16.2.27 AltManufacturerAccess() 0x002F Lifetime Data SPEED UP Mode
       28. 16.2.28 AltManufacturerAccess() 0x0030 Seal Device
       29. 16.2.29 AltManufacturerAccess() 0x0035 Security Keys
       30. 16.2.30 AltManufacturerAccess() 0x0041 Device Reset
       31. 16.2.31 AltManufacturerAccess() 0x0047 Tambient Sync
       32. 16.2.32 AltManufacturerAccess() 0x004A Device Name
       33. 16.2.33 AltManufacturerAccess() 0x004B Device Chem
       34. 16.2.34 AltManufacturerAccess() 0x004C Manufacturer Name
       35. 16.2.35 AltManufacturerAccess() 0x004D Manufacture Date
       36. 16.2.36 AltManufacturerAccess() 0x004E Serial Number
       37. 16.2.37 AltManufacturerAccess() 0x0052 PFAlert
           1. 16.2.37.1 PF Alert A+B
           2. 16.2.37.2 PF Alert C+D
       38. 16.2.38 AltManufacturerAccess() 0x0053 PFStatus
           1. 16.2.38.1 PF Status A+B
           2. 16.2.38.2 PF Status C+D
       39. 16.2.39 AltManufacturerAccess() 0x0054 OperationStatus
           1. 16.2.39.1 Operation Status A
           2. 16.2.39.2 Operation Status B
       40. 16.2.40 AltManufacturerAccess() 0x0055 ChargingStatus
           1. 16.2.40.1 Temp Range
           2. 16.2.40.2 Charging Status
       41. 16.2.41 AltManufacturerAccess() 0x0056 GaugingStatus
       42. 16.2.42 AltManufacturerAccess() 0x0057 ManufacturingStatus
       43. 16.2.43 AltManufacturerAccess() 0x0060 Lifetime Data Block 1
       44. 16.2.44 AltManufacturerAccess() 0x0061 Lifetime Data Block 2
       45. 16.2.45 AltManufacturerAccess() 0x0062 Lifetime Data Block 3
       46. 16.2.46 ManufacturerAccess() 0x0063 Lifetime Data Block 4
       47. 16.2.47 ManufacturerAccess() 0x0064 Lifetime Data Block 5
       48. 16.2.48 AltManufacturerAccess() 0x0065–0x006B Lifetime SOC Range Table Data Blocks
       49. 16.2.49 AltManufacturerAccess() 0x006C Lifetime Data Block 13
       50. 16.2.50 AltManufacturerAccess() 0x0070 ManufacturerInfo
       51. 16.2.51 AltManufacturerAccess() 0x0071 DAStatus1
       52. 16.2.52 AltManufacturerAccess() 0x0072 DAStatus2
       53. 16.2.53 AltManufacturerAccess() 0x0073 ITStatus1
       54. 16.2.54 AltManufacturerAccess() 0x0074 ITStatus2
       55. 16.2.55 AltManufacturerAccess() 0x0075 ITStatus3
       56. 16.2.56 AltManufacturerAccess() 0x0077 FCC_SOH
       57. 16.2.57 AltManufacturerAccess() 0x0078 Filtered Capacity
       58. 16.2.58 AltManufacturerAccess() 0x007A ManufacturerInfoB
       59. 16.2.59 AltManufacturerAccess() 0x007B ManufacturerInfoC
       60. 16.2.60 AltManufacturerAccess() 0x0097 FET Control Override
       61. 16.2.61 AltManufacturerAccess() 0x00A3 System Reset Enable
       62. 16.2.62 AltManufacturerAccess() 0x00A4 System Reset
       63. 16.2.63 AltManufacturerAccess() 0x00B0 ChargingVoltageOverride
       64. 16.2.64 AltManufacturerAccess() 0x00B1 BattSenseOutput
       65. 16.2.65 AltManufacturerAccess() 0x00E0 Ra Table Cell0
       66. 16.2.66 AltManufacturerAccess() 0x0F00 ROM Mode
       67. 16.2.67 Data Flash Access() 0x4000–0x5FFF
       68. 16.2.68 AltManufacturerAccess() 0x7C40 Switch to HDQ
       69. 16.2.69 AltManufacturerAccess() 0xF080 Exit Calibration Output Mode
       70. 16.2.70 AltManufacturerAccess() 0xF081 Output CC and ADC for Calibration
       71. 16.2.71 AltManufacturerAccess() 0xF083 OutputTemperatureCal
       72. 16.2.72 AltManufacturerAccess() 0xF0A0 ProtectorCalibration
       73. 16.2.73 AltManufacturerAccess() 0xF0A1 ProtectorImage1
       74. 16.2.74 AltManufacturerAccess() 0xF0A2 ProtectorImage2
       75. 16.2.75 AltManufacturerAccess() 0xF0A3 ProtectorImageSave
       76. 16.2.76 AltManufacturerAccess() 0xF0A4 ProtectorImageLock
       77. 16.2.77 AltManufacturerAccess() 0xF0A5 ProtectorFactoryConfig
19. 17Data Flash Access and Format
    1. 17.1 Data Flash Access
       1. 17.1.1 Minimum Voltage
    2. 17.2 Data Formats
       1. 17.2.1 Unsigned Integer
       2. 17.2.2 Integer
       3. 17.2.3 Floating Point
       4. 17.2.4 Hex
       5. 17.2.5 String
20. 18Data Flash Summary
    1. 18.1 Data Flash Summary
21. 19Revision History