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SLUUCO9A April 2023 – November 2023 BQ28Z620

1
Read This First
1. About This Manual
2. Notational Conventions
3. Trademarks
4. Glossary
1 Introduction
2 BQ28Z620 Change List
1. 2.1 Auto Ship Time
2. 2.2 Safety Cell UnderVoltage Permanent Fail
3. 2.3 OCV Reading Before FETs Enabled
4. 2.4 SOH Calculation Based on the Battery Specification
5. 2.5 Sync Filtered and Unfiltered Data when OCV Taken
6. 2.6 Additional Changes
3 Protections
1. 3.1 Introduction
2. 3.2 Cell Undervoltage Protection
3. 3.3 Cell Overvoltage Protection
4. 3.4 Overcurrent in Charge Protection
5. 3.5 Overcurrent in Discharge Protection
6. 3.6 Hardware-Based Protection
7. 3.7 Temperature Protections
8. 3.8 Overtemperature in Charge Protection
9. 3.9 Overtemperature in Discharge Protection
10. 3.10 Undertemperature in Charge Protection
11. 3.11 Undertemperature in Discharge Protection
12. 3.12 Precharge Timeout Protection
13. 3.13 Fast Charge Timeout Protection
4 Permanent Fail
1. 4.1 Introduction
2. 4.2 Safety Cell Undervoltage Permanent Fail
  1. 4.2.1 SUV Check Option
3. 4.3 Safety Cell Overvoltage Permanent Fail
4. 4.4 Voltage Imbalance at Rest Permanent Fail
5. 4.5 Voltage Imbalance Active Permanent Fail
6. 4.6 Charge FET Permanent Failure
  1. 4.6.1 Description
  2. 4.6.2 Feature Enable/Disable
7. 4.7 Discharge FET Permanent Failure
  1. 4.7.1 Description
  2. 4.7.2 Feature Enable/Disable
8. 4.8 Instruction Flash (IF) Checksum Permanent Fail
9. 4.9 Data Flash (DF) Permanent Fail
5 Advanced Charge Algorithm
1. 5.1 Introduction
2. 5.2 Charge Temperature Ranges
3. 5.3 Voltage Range
4. 5.4 Charging Current
5. 5.5 Charging Voltage
6. 5.6 Valid Charge Termination
7. 5.7 Charge and Discharge Alarms
8. 5.8 Terminate Charge and Discharge Alarms
9. 5.9 Precharge
10. 5.10 Maintenance Charge
11. 5.11 BROADCAST Mode
12. 5.12 Charge Disable and Discharge Disable
13. 5.13 Charge Inhibit
14. 5.14 Charge Suspend
6 Power Modes
1. 6.1 Introduction
2. 6.2 NORMAL Mode
3. 6.3 SLEEP Mode
4. 6.4 SHUTDOWN Mode
7 Power Modes
1. 7.1 Introduction
2. 7.2 NORMAL Mode
3. 7.3 SLEEP Mode
4. 7.4 SHUTDOWN Mode
8 Gauging
1. 8.1 Introduction
2. 8.2 Impedance Track Configuration
3. 8.3 Gas Gauge Modes
4. 8.4 QMax and Ra
5. 8.5 FullChargeCapacity (FCC), RemainingCapacity (RemCap), and RelativeStateOfCharge (RSOC)
6. 8.6 Impedance Track (IT) Configuration Options
7. 8.7 State-of-Health (SOH)
9 Cell Balancing
1. 9.1 Introduction
2. 9.2 Cell Balancing Setup
3. 9.3 Cell Balancing Operation
10Lifetime Data Collection
1. 10.1 Description
11Device Security
1. 11.1 Description
2. 11.2 SHA-1 Description
3. 11.3 HMAC Description
4. 11.4 Authentication
5. 11.5 Security Modes
12Manufacture Production
1. 12.1 Manufacture Testing
2. 12.2 Calibration
13Calibration
1. 13.1 Cell Voltage Calibration
2. 13.2 VC2 (BAT) Voltage Calibration
3. 13.3 PACK Voltage Calibration
4. 13.4 Current Calibration
5. 13.5 Temperature Calibration
  1. 13.5.1 Internal Temperature Sensor Calibration
  2. 13.5.2 TS1 Calibration
14I2C Commands
1. 14.1 Standard Data Commands
2. 14.2 Manufacturer Access Control (MAC)
15Data Flash Values
1. 15.1 Data Formats
2. 15.2 Calibration
3. 15.3 Settings
4. 15.4 Advanced Charging Algorithms
5. 15.5 Power
6. 15.6 Gas Gauging
7. 15.7 System Data
  1. 15.7.1 Manufacturer Data
  2. 15.7.2 Integrity
8. 15.8 Configuration
  1. 15.8.1 Data
9. 15.9 Lifetimes
10. 15.10 Protections
11. 15.11 Permanent Fail
12. 15.12 PF Status
13. 15.13 RA Table
16Data Flash Summary
1. 16.1 Data Flash Table
A AFE Control Register
B AFE Threshold and Delay Settings
1. B.1 Overload in Discharge Protection (AOLD)
2. B.2 Short Circuit in Charge (ASCC)
3. B.3 Short Circuit in Discharge (ASCD1 and ASCD2)
C Revision History

7.5.1 Device Sleep

When the sleep conditions are met, the device goes into SLEEP mode with periodic wake-ups to reduce power consumption. The device returns to NORMAL mode if any exit sleep condition is met.

BQ28Z620 includes an AFE gate drive change function to automatically reduce the AFE drive voltage to save quiescent current. When entering SLEEP mode, the gauge sets AFE CONTROL[PMPDRV] to 1, and the CHG FET and DSG FET gate drive is reduced to 5.75 V for lower quiescent current. When the gauge is out of SLEEP mode, the gauge sets AFE CONTROL[PMPDRV] to 0, and the gate drives goes back to 9.4 V. When AFE CONTROL[PMPDRV]=1 but VC2 voltage is below PMPDRV On VC2, AFE CONTROL[PMPDRV] goes to 0 to keep the charge pump voltage high. When VC2 voltage rises above PMPDRV On VC2 + PMPDRV Hysteresis Voltage, AFE CONTROL[PMPDRV] goes back to 1.

Bit 7 (PMPDRV) of Settings Configuration FET Options enables the AFE gate drive change in SLEEP mode..

Status	Condition	Action
Activate	SMBus low for Bus Timeout if *[IN_SYSTEM_SLEEP]* = 0 OR No communication for *Bus Timeout* if *[IN_SYSTEM_SLEEP]* = 1 AND *DA Config[SLEEP]* = 1⁽¹⁾ AND \|Current()\| ≤ *Sleep Current* AND *Voltage Time* > 0 AND OperationStatus()[SDM] = 0 AND No SafetyAlert() bits set AND⁽⁷⁾ No [AOLD], [ASCC], [ASCD], set in SafetyStatus()	Turn off CHG FET if *FET Options[SLEEPCHG]* = 0. The device goes to sleep. The device wakes up every *Sleep:Voltage Time* period to measure voltage and temperature. Device wakes up every *Sleep:Current Time* period to measure current.
Exit	I²C connected⁽¹⁾ OR I²C bus activity⁽³⁾ OR *DA Config[SLEEP]* = 0⁽¹⁾ OR \|Current()\| > *Sleep Current* OR Wake comparator activates⁽⁵⁾ OR *Voltage Time* = 0 OR OperationStatus()[SDM] = 1 OR SafetyAlert() bits set OR [AOLD], [ASCC], [ASCD], set in SafetyStatus()	Return to NORMAL mode

(1) DA Config[SLEEP] and I²C low are not checked if the MACSubcmd() SLEEP mode command is used to enter SLEEP mode.

(3) Wake on I²C command is only possible when the gas gauge is put to sleep using the MACSubcmd() SLEEP mode command or [IN_SYSTEM_SLEEP] is enabled with Bus Timeout = 0. Otherwise, the gas gauge wakes on an I²C connection (clock or data high).

(5) The wake comparator threshold is set through Power.WakeComparator[WK1,WK0] (see Section 7.5.7).

(7) SafetyAlert()[PTO], [PTOS], [CTO], [CTOS] do not prevent the gauge to enter SLEEP mode.