Texas Instruments BQ28Z610-R2 User Manual

3.1 Introduction
The device can permanently disable the battery pack in the case of a severe failure, such as an error in the
instruction flash check (IFC) or in the data flash write (DFW). An IFC failure is set by the gauge if the signature
fails to pass verification at power-on reset. The DFW failure is set by the gauge if it is unable to successfully
program an update to the data flash (the read-back verification fails). When one of these failure modes is
detected, the following actions are taken in sequence:
1. Charge and discharge FETs are turned off.
2. OperationStatus()[PF] = 1
3. The following data is changed: BatteryStatus()[TCA] = 1, BatteryStatus()[TDA] = 1, ChargingCurrent() = 0,
and ChargingVoltage() = 0.
4. A backup of the internal AFE hardware registers are written to data flash: AFE Interrupt Status, AFE
FET Status, AFE RXIN, AFE Latch Status, AFE Interrupt Enable, AFE FET Control, AFE RXIEN, AFE
Cell Balance, AFE AD/CC Control, AFE ADC Mux, AFE State Control, Wake Control, AFE Protection
Control, AFE OCD, AFE SCC, AFE SCD1, and AFE SCD2.
5. The following values are preserved in data flash for failure analysis:
• SafetyAlert()
• SafetyStatus()
• OperationStatus()
• ChargingStatus()
• GaugingStatus()
• Voltages in DAStatus1()
• Current()
• TSINT, TS1, from DAStatus2()
• Cell DOD0 and passed charge
6. Data flash writing is disabled.
While the device is in this PERMANENT FAIL mode, any new SafetyAlert(), SafetyStatus() flags that are set are
added to the permanent fail log.
3.2 Safety Cell Overvoltage Permanent Fail
The device can permanently disable the battery in the case of severe overvoltage in any of the cells.
Status Condition Action
Normal All Cell voltages in DAStatus1() < SOV:Threshold PFAlert()[SOV] = 0
Alert Any Cell voltages in DAStatus1() ≥ SOV:Threshold
PFAlert()[SOV] = 1
BatteryStatus()[TCA] = 1
BatteryStatus()[OCA] = 1
Trip
Any Cell voltages in DAStatus1() continuous ≥ SOV:Threshold for
SOV:Delay duration
PFAlert()[SOV] = 0
PFStatus()[SOV] = 1
BatteryStatus()[OCA] = 1
BatteryStatus()[TCA] = 1
BatteryStatus()[TDA] = 1
Chapter 3
Permanent Fail
www.ti.com Permanent Fail
SLUUCO0 – APRIL 2022
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Texas Instruments BQ28Z610-R2 Specifications

General

Brand	Texas Instruments
Model	BQ28Z610-R2
Category	Computer Hardware
Language	English