BQ40Z50-R2 datasheet(25/55 Pages) TI2

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8.3 Feature Description

8.3.1 Primary (1st Level) Safety Features

The BQ40Z50-R2 supports a wide range of battery and system protection features that can easily be configured.

See the BQ40Z50-R2 Technical Reference Manual (SLUUBK0) for detailed descriptions of each protection

function.

The primary safety features include:

• Cell Overvoltage Protection

• Cell Undervoltage Protection

• Cell Undervoltage Protection Compensated

• Overcurrent in Charge Protection

• Overcurrent in Discharge Protection

• Overload in Discharge Protection

• Short Circuit in Charge Protection

• Short Circuit in Discharge Protection

• Overtemperature in Charge Protection

• Overtemperature in Discharge Protection

• Undertemperature in Charge Protection

• Undertemperature in Discharge Protection

• Overtemperature FET protection

• Precharge Timeout Protection

• Host Watchdog Timeout Protection

• Fast Charge Timeout Protection

• Overcharge Protection

• Overcharging Voltage Protection

• Overcharging Current Protection

• Over Precharge Current Protection

8.3.2 Secondary (2nd Level) Safety Features

The secondary safety features of the BQ40Z50-R2 can be used to indicate more serious faults via the FUSE

pin. This pin can be used to blow an in-line fuse to permanently disable the battery pack from charging or

discharging. See the BQ40Z50-R2 Technical Reference Manual (SLUUBK0) for detailed descriptions of each

protection function.

The secondary safety features provide protection against:

• Safety Overvoltage Permanent Failure

• Safety Undervoltage Permanent Failure

• Safety Overtemperature Permanent Failure

• Safety FET Overtemperature Permanent Failure

• Qmax Imbalance Permanent Failure

• Impedance Imbalance Permanent Failure

• Capacity Degradation Permanent Failure

• Cell Balancing Permanent Failure

• Fuse Failure Permanent Failure

• PTC Permanent Failure

• Voltage Imbalance At Rest Permanent Failure

• Voltage Imbalance Active Permanent Failure

• Charge FET Permanent Failure

• Discharge FET Permanent Failure

• AFE Register Permanent Failure

• AFE Communication Permanent Failure

• Second Level Protector Permanent Failure

• Instruction Flash Checksum Permanent Failure

• Open Cell Connection Permanent Failure

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BQ40Z50-R2

SLUSCS4C – JUNE 2017 – REVISED APRIL 2021

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