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SLUUD50 October 2024 BQ27Z758

1
Read This First
1. About This Manual
2. Notational Conventions
3. Battery Notational Conventions
4. Trademarks
5. Glossary
1 Introduction
2 IO Options
1. 2.1 Configuration of the GPO Pin
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
4 Protections
1. 4.1 Introduction
2. 4.2 Hardware-Based Protection
3. 4.3 Firmware Based Protections
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
6 Battery Sensing Output
1. 6.1 Introduction
2. 6.2 Automatic Mode
3. 6.3 Hardware-Based Protections
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
7. 7.7 Power Modes Configuration
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
8. 8.8 FullChargeCapacity (FCC), RemainingCapacity (RemCap), and RelativeStateOfCharge (RSOC)
  1. 8.8.1 Smoothing Engine
9. 8.9 Impedance Track (IT) Configuration Options
10. 8.10 State-Of-Health (SOH)
11. 8.11 Battery Trip Point (BTP)
9 Lifetime Data Collection
1. 9.1 Description
2. 9.2 Reset
10Host Interrupts
1. 10.1 Description
2. 10.2 Voltage and Temperature Interrupts
3. 10.3 RSOC Interrupts
4. 10.4 Host Interrupts Configuration
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
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)
13Communications
1. 13.1 HDQ Single-Pin Serial Interface
2. 13.2 I2C Interface
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
15Calibration
1. 15.1 Voltage Calibration
2. 15.2 Current Calibration
3. 15.3 Temperature Calibration
16Data Commands
1. 16.1 Standard Data Commands
2. 16.2 0x00, 0x01 ManufacturerAccess() and 0x3E, 0x3F AltManufacturerAccess()
17Data Flash Access and Format
1. 17.1 Data Flash Access
  1. 17.1.1 Minimum Voltage
2. 17.2 Data Formats
18Data Flash Summary
1. 18.1 Data Flash Summary
19Revision History

7.5 SHELF Mode

SHELF mode operates the same as SHIP mode with a minimized amount of measurements and firmware processing. However, device power consumption in SHELF mode is reduced from SHIP mode by turning off the CHG and DSG FETs and hardware protector (all hardware-based protections and IWAKE). Due to the FETs being off in SHELF mode, the system is not powered without a charger attached, so the exit conditions are different from SHIP mode and the FET control logic is not performed.

In SHELF mode, the device measures voltage and temperature very infrequently and at shorter ADC conversion times, and current is not measured or coulomb counted. Current is assumed to be and reported as 0 mA. Therefore, the device tracks the battery's state-of-charge from OCVs. The measurements performed each interval are:

Cell voltage
Temperature (rotating between TSInt, TS1, and TS2 if enabled)
PACK voltage (every fourth interval)

Note: The ADC conversion time for temperature measurements is short enough that added capacitance on the TS and GPO (for TS2 if enabled) pins can cause temperature error due to longer voltage settling time.

Firmware processing is minimized by reducing the number of calculations. Some calculations are performed less frequently: only after voltage and temperature are measured. These less frequent calculations include updating firmware-based protections, lifetime data, and the voltage and temperature range of the advanced charge algorithm. Other calculations, such as updating RemainingCapacity() and FullChargeCapacity, are not performed at all with the assumption the system is off and will not communicate with the gauge.

SHELF mode is entered based on voltage through SLEEP or SHIP or by command through NORMAL or SLEEP. Exit from this mode is through command, voltage at the PACK terminal > V_STARTUP, or the ENAB pin being pulled low. The latter two conditions are shared with SHUTDOWN and only checked Shelf Exit Holdoff seconds after entering SHELF mode to allow pin voltages to settle once the DSG and CHG FETs turn off.

Status	Condition	Action
Activate	(OperationStatusA()[SLEEP] = 1 AND Voltage() < *Shelf Voltage Threshold* for *Shelf Voltage Delay) OR (OperationStatusB()[SHELFM]* = 1 for *Shelf Command Delay* AND \|Current()\| ≤ *Sleep Current*)	OperationStatusA()[SHELF] = 1 The device enters RELAX mode. Current() = 0 mA, AverageCurrent() = 0 mA The device wakes up every *Shelf Measure Time* to measure voltage and temperature.⁽¹⁾ The device does NOT coulomb count or measure current. Turn off the CHG and DSG FETs. Turn off the protector (all hardware-based protections and IWAKE).
Exit	(Voltage() ≥ *Shelf Voltage Threshold* AND OperationStatusB()[SHELFM] = 0) OR (OperationStatusB()[SHELFM] = 1 AND MAC ShelfDisable() received) OR (Time in SHELF mode ≥ *Shelf Exit Holdoff* AND (Voltage at PACK terminal > V_STARTUP OR ENAB pin pulled low))	OperationStatusA()[SHELF] = 0 OperationStatusB()[SHELFM] = 0 Return to NORMAL mode

(1) For best performance, the device wakes up every 1 second to measure voltage and temperature when an OCV is in progress (GaugingStatus()[SLPQMAX] = 1) or a firmware-based protection entered the alert state (that is, SafetyAlert() ≠ 0).

Note:

If the gauge is UNSEALED and the MAC ShelfEnable() command is sent twice in a row, the gauge enters SHELF immediately and skips the normal delay sequence.

The configuration options for SHELF are in the following data flash.

Class	Subclass	Name	Type	Min	Max	Default	Unit	Description
Power	Shelf	Shelf Voltage Threshold	I2	0	32767	2200	mV	Cell based SHELF voltage trip threshold
Power	Shelf	Shelf Voltage Delay	U2	0	255	10	s	Cell based SHELF voltage trip delay
Power	Shelf	Shelf Measure Time	U1	1	30	30	s	Determines the wake interval to measure voltage and temperature in SHELF mode
Power	Shelf	Shelf Command Delay	U1	0	255	10	s	Delay time to enter SHELF mode after MAC ShelfEnable() is received. The device takes an additional 1-2 seconds to enter SHELF mode for command processing
Power	Shelf	Shelf Exit Holdoff	U1	1	255	10	s	Holdoff time after entering SHELF mode to check the PACK and ENAB pin exit conditions