BQ40Z50-R2 Datasheet, PDF (23/51 Pages) Texas Instruments – 1-Series, 2-Series, 3-Series, and 4-Series Li-Ion Battery Pack Manager

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bq40z50-R2
SLUSCS4 – JUNE 2017
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
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