BQ4050 Datasheet, PDF (24/53 Pages) Texas Instruments – CEDV Gas Gauge and Protection Solution

bq4050
SLUSC67A – MARCH 2016 – REVISED MARCH 2016
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7.3 Feature Description
7.3.1 Primary (1st Level) Safety Features
The bq4050 supports a wide range of battery and system protection features that can easily be configured. See
the bq4050 Technical Reference Manual (SLUUAQ3) for detailed descriptions of each protection function.
The primary safety features include:
• Cell Overvoltage Protection
• Cell Undervoltage Protection
• 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
• Overcharge Protection
• Overcharging Voltage Protection
• Overcharging Current Protection
• Over Precharge Current Protection
7.3.2 Secondary (2nd Level) Safety Features
The secondary safety features of the bq4050 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 bq4050 Technical Reference Manual (SLUUAQ3) 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
• Fuse Failure Permanent Failure
• PTC Permanent Failure
• Voltage Imbalance at Rest (VIMR) Permanent Failure
• Voltage Imbalance Active (VIMA) 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
• Data Flash Permanent Failure
• Open Thermistor Permanent Failure
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