Texas Instruments bq78350-R1 Technical Reference

Cell Overvoltage Protection www.ti.com
22
SLUUBD3D–September 2015–Revised September 2018
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Protections
Class Subclass Name Type Min Max Default Unit
Protections CUV Threshold I2 0 5000 2500 mV
Protections CUV Delay U1 0 255 2 s
Protections CUV Recovery I2 0 5000 3000 mV
3.3 Cell Overvoltage Protection
The device can detect cell overvoltage in batteries and protect cells from damage by preventing further
charging.
Upon COV detection, a snapshot of the measured cell voltages are made available in COVSnapshot().
This snapshot is available until the next instance of a COV fault, as this causes the data to be updated to
the latest set of measurements.
Status Condition Action
Normal All voltages in CellVoltage1..15() < COV:Threshold SafetyAlert()[COV] = 0
Alert Any voltage in CellVoltage1..15() ≥ COV:Threshold
SafetyAlert()[COV] = 1
BatteryStatus()[TCA] = 1
Trip
Any voltage in CellVoltage1..15() ≥ COV:Threshold
continuous ≥ COV:Threshold for COV:Delay duration
SafetyAlert()[COV] = 0
SafetyStatus()[COV] = 1
BatteryStatus()[TCA] = 0
Recovery
SafetyStatus()[COV] = 1 AND Protection
Configuration:VAUXR = 0
all voltages in CellVoltage1..15() ≤ COV:Recovery
SafetyStatus()[COV] = 0
BatteryStatus()[TCA] = 0
Recovery
SafetyStatus()[COV] = 1 AND Protection
Configuration:VAUXR = 1
all voltages in CellVoltage1..15() ≤ COV:Recovery AND
VAUXVoltage() < Power:Charger Present Threshold
SafetyStatus()[COV] = 0
BatteryStatus()[TCA] = 0
Class Subclass Name Type Min Max Default Unit
Protections COV Threshold I2 0 32767 4300 mV
Protections COV Delay U1 0 255 2 s
Protections COV Recovery I2 0 32767 4100 mV
3.4 Overcurrent in Charge Protection
The device has overcurrent in charge protection that can be configured to specific current and delay
thresholds to accommodate charging behaviors. See Section 3.1.4 for additional FET action options.
Status Condition Action
Normal Current() < OCC:Threshold SafetyAlert()[OCC] = 0
Alert Current() ≥ OCC:Threshold
SafetyAlert()[OCC] = 1
BatteryStatus()[TCA] = 1
Trip
Current() continuous ≥ OCC:Threshold for
OCC:Delay duration
SafetyAlert()[OCC] = 0
SafetyStatus()[OCC] = 1
BatteryStatus()[TCA] = 0
OperationStatus()[XCHG] = 1
Charging is not allowed.
Recovery
[SafetyStatus()[OCC] = 1 AND
Current() continuous ≤ OCC:Recovery Threshold
for OCC:Recovery Delay time
SafetyStatus()[OCC] = 0
BatteryStatus()[TCA] = 0
OperationStatus()[XCHG] = 0
Charging is allowed.

Texas Instruments bq78350-R1 Specifications

General

Brand	Texas Instruments
Model	bq78350-R1
Category	Controller
Language	English